1. A preparation method of high-purity hydrogen bromide is characterized by comprising the following steps: the method comprises the following steps:

s1: preparing a metal bromide solution under the protection of inert gas;

s2: cleaning and drying a container and a pipeline related to the process, and purging with inert gas; introducing chlorine into a reactor filled with the metal bromide solution, and reacting under the stirring condition to prepare a bromine mixture;

s3: heating the bromine mixture to evaporate bromine, and removing moisture in the bromine through a drying tower;

s4: the dehydrated bromine enters a fixed bed with a catalyst added in advance, and hydrogen is introduced for reaction to prepare a crude product of hydrogen bromide;

s5: condensing the crude hydrogen bromide, and then passing through an adsorption tower to obtain dehydrated hydrogen bromide;

s6: and rectifying the dehydrated hydrogen bromide by a two-stage rectifying tower to obtain high-purity hydrogen bromide.

2. The process for producing high-purity hydrogen bromide according to claim 1, wherein: in step S1, the inert gas is one or more of high-purity nitrogen, helium, neon, argon, or xenon.

3. The process for producing high-purity hydrogen bromide according to claim 1 or 2, wherein: in step S1, the metal bromide solution includes one or more of a lithium bromide aqueous solution, a sodium bromide aqueous solution, and a potassium bromide aqueous solution, and preferably, the sodium bromide solution has a mass percent concentration of 35% to 45%, the lithium bromide solution has a mass percent concentration of 50% to 60%, and the potassium bromide solution has a mass percent concentration of 25% to 35%.

4. The process for producing high-purity hydrogen bromide according to claim 1 or 2, wherein: in the step S2, the reaction temperature is 15-30 ℃, the pressure is 0.01-0.08 MPa, the ratio of chlorine to metal bromide is 0.8-5L/min: 1kg, and the reaction time is 1-3 h.

5. The process for producing high-purity hydrogen bromide according to claim 1 or 2, wherein: in step S3, the bromine mixture is heated to 60-80 ℃ and the pressure is 0.01-0.08 MPa.

6. The process for producing high-purity hydrogen bromide according to claim 1 or 2, wherein: in step S4, the catalyst is a platinum-supported silica catalyst or a platinum-supported alumina catalyst, and the catalyst is filled in a fixed bed for preheating, wherein the heating rate is 5-20 ℃/min, and the temperature is controlled to be 320-380 ℃.

7. The process for producing high-purity hydrogen bromide according to claim 1 or 2, wherein: in step S4, the flow ratio of bromine and hydrogen is 1: 1.5-1: 5, and the flow of bromine is controlled to 1-1.5 m³/h。

8. The process for producing high-purity hydrogen bromide according to claim 1 or 2, wherein: in step S6, the rectification temperature is controlled to be-10 to-50 ℃, and the rectification pressure is controlled to be 0.3 to 0.7 MPa.

9. A synthetic purification device of high-purity hydrogen bromide is characterized in that: including raw materials supply unit, bromine produces and drying unit, hydrogen bromide synthesizer, hydrogen bromide purification device, the finished product fills the dress unit, raw materials supply unit includes hydrogen cylinder and chlorine cylinder, bromine produces and drying unit includes bromine generator and bromine drying tower, the chlorine cylinder passes through tube coupling to bromine generator, bromine generator passes through tube coupling to bromine drying tower, hydrogen bromide synthesizer includes the fixed bed, bromine drying tower and hydrogen cylinder are respectively through tube coupling to fixed bed, the fixed bed passes through tube coupling to hydrogen bromide purification device, hydrogen bromide purification device passes through tube coupling to finished product and fills the dress unit.

10. The apparatus for synthesizing and purifying high-purity hydrogen bromide according to claim 9, wherein: the hydrogen bromide purification device comprises a condenser, an adsorption column I, an adsorption column II, a rectifying tower A and a rectifying tower B, wherein the condenser is connected to the adsorption column I through a pipeline, the adsorption column I is connected to the adsorption column II through a pipeline, the adsorption column II is connected to the rectifying tower A through a pipeline, and a tower kettle of the rectifying tower A is connected to the rectifying tower B through a pipeline;

the finished product filling unit comprises a buffer tank and a finished product bottle, the top of the rectifying tower B is connected to the buffer tank through a pipeline, the buffer tank is connected to the finished product bottle through a pipeline, and an electric heating device is arranged on the outer side of the buffer tank.

Background

High-purity electronic grade HBr is mainly used for etching polysilicon in 8-inch and 12-inch chip manufacturing processes, and is one of core gases in advanced chip manufacturing processes. In addition, hydrogen bromide has the ability to act as a catalyst or reactant, and is used by the semiconductor industry as one of the candidate etching gases for processing large trench structures in future processes of less than 7 nm. The special high-purity electronic grade hydrogen bromide gas has unique etching and deposition characteristics, is difficult to replace by other special gases in a short time, and becomes a bottleneck that advanced processing materials of the integrated circuit are restricted by people at present.

The raw material hydrogen bromide used for the high-purity electronic grade hydrogen bromide is generally obtained by burning bromine and hydrogen or reacting at high temperature under the action of a catalyst. Bromine is a readily toxic substance, and therefore, there is a risk in purchasing, transporting, storing, and disposing of waste packaging. The existing synthesis process adopts direct addition of raw material bromine, the existing hydrogen bromide synthesis patent does not describe the feeding process in detail, and if the feeding process is not strictly controlled, bromine leakage is easily caused, and the environment and the human body are injured.

Disclosure of Invention

The invention aims to provide a preparation method of high-purity hydrogen bromide, which comprises the steps of preparing bromine by reacting metal bromide with chlorine, adsorbing and drying the bromine evaporated after heating, then allowing the bromine to enter a fixed bed, reacting with hydrogen under the action of a catalyst to prepare hydrogen bromide gas, and then performing adsorption dehydration and two-stage rectification to obtain the high-purity hydrogen bromide. The synthesis method has the advantages of easily obtained raw materials and accurate and controllable feeding process. Bromine is used during the time of production, has solved the reinforced in-process of bromine and has revealed the risk, has saved the storage of bromine, transportation and abandonment packing material processing scheduling problem simultaneously.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a preparation method of high-purity hydrogen bromide comprises the following steps:

s1: preparing a metal bromide solution under the protection of inert gas;

s2: cleaning and drying a container and a pipeline related to the process, and purging with inert gas; introducing chlorine into a reactor filled with the metal bromide solution, and reacting under the stirring condition to prepare a bromine mixture;

s3: heating the bromine mixture to evaporate bromine, and removing moisture in the bromine through a drying tower;

s4: the dehydrated bromine enters a fixed bed with a catalyst added in advance, and hydrogen is introduced for reaction to prepare a crude product of hydrogen bromide;

s5: condensing the crude hydrogen bromide, and then passing through an adsorption tower to obtain dehydrated hydrogen bromide;

s6: and rectifying the dehydrated hydrogen bromide by a two-stage rectifying tower to obtain high-purity hydrogen bromide.

Preferably, in step S1, the inert gas is one or more of high-purity nitrogen, helium, neon, argon, or xenon.

Preferably, in step S1, the metal bromide solution includes one or more of a lithium bromide aqueous solution, a sodium bromide aqueous solution, and a potassium bromide aqueous solution, and preferably, the sodium bromide solution has a mass percentage concentration of 35% to 45%, the lithium bromide solution has a mass percentage concentration of 50% to 60%, and the potassium bromide solution has a mass percentage concentration of 25% to 35%.

The concentration of the selected metal bromide solution is close to the concentration of the saturated solution, and if the concentration is too high, the preparation is difficult; if the concentration of the metal bromide is too low, the water content is high, and when the metal bromide is evaporated after the bromine preparation, the evaporated water content is increased, and the dehydration burden of the bromine desiccant is increased.

Preferably, in the step S2, the reaction temperature is 15-30 ℃, the pressure is 0.01-0.08 MPa, the ratio of chlorine to metal bromide is 0.8-5L/min: 1kg, and the reaction time is 1-3 h.

The reaction temperature is too low, the reaction rate is slow, the reaction temperature is too high, the volatilization of bromine is too fast, and the conversion rate is low.

Preferably, in step S3, the bromine mixture is heated to 60 to 80 ℃ under a pressure of 0.01 to 0.08 MPa.

The boiling point of bromine is 58.76 ℃, the temperature is too high, the distilled water is too much, and the temperature is too low, the bromine evaporation speed is slow.

Preferably, in step S4, the catalyst is a platinum-supported silica catalyst or a platinum-supported alumina catalyst, and the catalyst is loaded in a fixed bed and preheated, with a temperature rise rate of 5-20 ℃/min and a temperature controlled at 320-380 ℃.

Preferably, in step S4, the flow ratio of bromine and hydrogen is 1: 1.5-1: 5, and the flow rate of bromine is 1-1.5 m³/h。

Preferably, in step S6, the rectification temperature is controlled to be-10 to-50 ℃, and the rectification pressure is controlled to be 0.3 to 0.7 MPa.

The invention also aims to provide a device for synthesizing and purifying high-purity hydrogen bromide so as to efficiently prepare hydrogen bromide gas.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the utility model provides a synthetic purification device of high-purity hydrogen bromide, including the raw materials supply unit, bromine produces and dry unit, hydrogen bromide synthesizer, hydrogen bromide purification device, the finished product fills the dress unit, the raw materials supply unit includes hydrogen cylinder and chlorine cylinder, bromine produces and dry unit includes bromine generator and bromine drying tower, the chlorine cylinder passes through tube coupling to bromine generator, bromine generator passes through tube coupling to bromine drying tower, hydrogen bromide synthesis device includes the fixed bed, bromine drying tower and hydrogen cylinder pass through tube coupling to fixed bed respectively, the fixed bed passes through tube coupling to hydrogen bromide purification device, hydrogen bromide purification device passes through tube coupling to finished product and fills the dress unit.

Preferably, the hydrogen bromide purification device comprises a condenser, a first adsorption column, a second adsorption column, a rectifying tower A and a rectifying tower B, wherein the condenser is connected to the first adsorption column through a pipeline, the first adsorption column is connected to the second adsorption column through a pipeline, the second adsorption column is connected to the tower of the rectifying tower A through a pipeline, and the tower kettle of the rectifying tower A is connected to the tower of the rectifying tower B through a pipeline;

the finished product filling unit comprises a buffer tank and a finished product bottle, the top of the rectifying tower B is connected to the buffer tank, the buffer tank is connected to the finished product bottle through a pipeline, and an electric heating device is arranged on the outer side of the buffer tank.

The fillers of the first adsorption column and the second adsorption column are AW-300 acid-resistant molecular sieves.

Compared with the prior art, the preparation method of high-purity hydrogen bromide has the following beneficial effects:

(1) according to the preparation method disclosed by the invention, the metal bromide and the chlorine are used as initial raw materials, the reactants are commonly and easily obtained, the bromine is prepared in the production process, the produced bromine is immediately utilized, and the problems of bromine storage, transportation, package treatment and the like are solved. Compared with the traditional bromine adding mode, the safety of the process is greatly improved;

(2) heating the prepared bromine to evaporate bromine steam, and adsorbing to obtain dry bromine, thereby solving the problem of high water content in the bromine at the source;

(3) according to the invention, the reaction of the dried bromine and hydrogen is a high-temperature catalytic reaction, rather than a combustion reaction of bromine and hydrogen to prepare hydrogen bromide, so that the problem of easy explosion caused by insufficient hydrogen purity is solved in the whole process, and the experimental safety is greatly improved;

(4) the preparation method disclosed by the invention is strong in operation controllability, high in product stability and easy for large-scale production.

Compared with the prior art, the device for synthesizing and purifying the high-purity hydrogen bromide has the same advantages as the preparation method of the high-purity hydrogen bromide, and the details are not repeated.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of an apparatus for synthesizing and purifying high-purity hydrogen bromide according to example 7 of the present invention.

Description of reference numerals:

1. a hydrogen gas cylinder; 2. a chlorine cylinder; 3. a bromine generator; 4. a bromine drying tower; 5. a fixed bed; 6. a condenser; 7. a first adsorption column; 8. a second adsorption column; 9. a rectifying tower A; 10. a rectifying tower B; 11. a buffer tank; 12. and (5) finished product bottles.

Detailed Description

Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.

The following examples employ equipment sizes: the bromine generator is 5L, the drying tower and the adsorption column are DN50 x 800, the fixed bed is phi 32 x 1300, the condenser is phi 32, the rectifying tower section phi 32 x 1500, and the tower kettle is DN100 x 200, wherein the bromine generator, the drying tower and the adsorption column are Beijing Ke Huabo Mei glass instruments ltd, and the rectifying tower is Tianjin blue sea pressure vessel manufacturing ltd;

wherein, the content analysis methods of the key impurities in the product are all conventional analysis methods in the gas industry. The specific content is according to GB/T3723 industrial chemical product sampling safety rule, GB/T5832.1 gas analysis trace moisture determination part 1: electrolytic method, measurement of trace moisture in GB/T5832.3 gas analysis part 3: cavity ring-down spectroscopy, gas chromatography for measuring carbon monoxide, carbon dioxide and hydrocarbon in GB/T8984 gas, helium ionization gas chromatography for GB/T28726 gas analysis, and infrared spectroscopy for GB/T6040.

The present invention will be described in detail with reference to the following examples and accompanying drawings.

Example 1

And step S1: under the protection of nitrogen gas, 40% sodium bromide solution is prepared.

And step S2: purging all containers after cleaning and drying by nitrogen, adding 2.5kg of sodium bromide solution into a bromine generator under the nitrogen protection atmosphere, controlling the temperature of the reactor to be 15 ℃ under the stirring condition, introducing 3L/min of chlorine, and reacting for 1.5 h.

And step S3: slowly raising the temperature of the bromine generator, controlling the temperature at 65 ℃ and the pressure at 0.03MPa, evaporating bromine, and removing water in the bromine through a drying tower.

And step S4: after dryingThe bromine flow of (2) is controlled to 1m³The mixture was introduced into a fixed bed preheated to 340 ℃ and packed with catalyst, the amount of hydrogen being 1.5m³And h, preparing a crude hydrogen bromide product.

And step S5: cooling the crude hydrogen bromide by cooling water, wherein the condensation temperature is normal temperature, and the condensed hydrogen bromide enters an adsorption column filled with an AW-300 acid-resistant molecular sieve adsorbent to remove water.

And step S6: the dehydrated hydrogen bromide enters a primary rectifying tower to remove light components with low boiling points such as carbon dioxide, carbon monoxide, hydrogen, chlorine and the like, the rectifying temperature is controlled between minus 30 ℃ and minus 50 ℃, and the pressure is 0.2 MPa to 0.4 MPa. Removing light-component hydrogen bromide, feeding the hydrogen bromide into a secondary rectifying tower, controlling the temperature of the secondary rectifying tower at-20 to-50 ℃ and the pressure of the secondary rectifying tower at 0.2 to 0.5Mpa, removing water and bromine impurities with higher boiling points, obtaining high-purity hydrogen bromide at the tower top, condensing the high-purity hydrogen bromide in a condenser by liquid nitrogen, and feeding the high-purity hydrogen bromide into a steel cylinder for filling.

Example 2

And step S1: under the protection of nitrogen gas, a 35% sodium bromide solution is prepared.

And step S2: purging all containers after cleaning and drying by nitrogen, adding 2.5kg of sodium bromide solution into a bromine generator under the nitrogen protection atmosphere, controlling the temperature of the reactor to be 25 ℃ under the stirring condition, introducing 2.5L/min of chlorine, and reacting for 2 h.

And step S3: slowly raising the temperature of the bromine generator, controlling the temperature at 60 ℃ and the pressure at 0.03MPa, evaporating bromine, and removing water in the bromine through a drying tower.

And step S4: the bromine flow after drying was controlled to 1m³The mixture was introduced into a fixed bed preheated to 340 ℃ and packed with catalyst, the amount of hydrogen being 1.5m³And h, preparing a crude hydrogen bromide product.

And step S5: cooling the crude hydrogen bromide by cooling water, wherein the condensation temperature is normal temperature, and the condensed hydrogen bromide enters an adsorption column filled with an AW-300 acid-resistant molecular sieve adsorbent to remove water.

And step S6: the dehydrated hydrogen bromide enters a primary rectifying tower to remove light components with low boiling points such as carbon dioxide, carbon monoxide, hydrogen, chlorine and the like, the rectifying temperature is controlled between minus 30 ℃ and minus 50 ℃, and the pressure is 0.2 MPa to 0.4 MPa. Removing light-component hydrogen bromide, feeding the hydrogen bromide into a secondary rectifying tower, controlling the temperature of the secondary rectifying tower at-20 to-50 ℃ and the pressure of the secondary rectifying tower at 0.2 to 0.5Mpa, removing water and bromine impurities with higher boiling points, obtaining high-purity hydrogen bromide at the tower top, condensing the high-purity hydrogen bromide in a condenser by liquid nitrogen, and feeding the high-purity hydrogen bromide into a steel cylinder for filling.

Example 3

And step S1: under the protection of nitrogen gas, a 50% lithium bromide solution is prepared.

And step S2: purging all containers after cleaning and drying by nitrogen, adding 2.5kg of lithium bromide solution into a bromine generator under the nitrogen protection atmosphere, controlling the temperature of the reactor to be 20 ℃ under the stirring condition, introducing 2.8L/min of chlorine, and reacting for 3 h.

And step S3: slowly raising the temperature of the bromine generator, controlling the temperature at 60 ℃ and the pressure at 0.03MPa, evaporating bromine, and removing water in the bromine through a drying tower.

And step S4: the bromine flow after drying was controlled to 1m³H into a fixed bed preheated to 360 ℃ and filled with catalyst, the amount of hydrogen fed in being 2m³And h, preparing a crude hydrogen bromide product.

And step S5: cooling the crude hydrogen bromide by cooling water, wherein the condensation temperature is normal temperature, and the condensed hydrogen bromide enters an adsorption column filled with an AW-300 acid-resistant molecular sieve adsorbent to remove water.

And step S6: the dehydrated hydrogen bromide enters a primary rectifying tower to remove light components with low boiling points such as carbon dioxide, carbon monoxide, hydrogen, chlorine and the like, the rectifying temperature is controlled between minus 30 ℃ and minus 50 ℃, and the pressure is 0.2 MPa to 0.4 MPa. Removing light-component hydrogen bromide, feeding the hydrogen bromide into a secondary rectifying tower, controlling the temperature of the secondary rectifying tower at-20 to-50 ℃ and the pressure of the secondary rectifying tower at 0.2 to 0.5Mpa, removing water and bromine impurities with higher boiling points, obtaining high-purity hydrogen bromide at the tower top, condensing the high-purity hydrogen bromide in a condenser by liquid nitrogen, and feeding the high-purity hydrogen bromide into a steel cylinder for filling.

Example 4

And step S1: under the protection of nitrogen gas, a 60% lithium bromide solution is prepared.

And step S2: purging all containers after cleaning and drying by nitrogen, adding 2.5kg of lithium bromide solution into a bromine generator under the nitrogen protection atmosphere, controlling the temperature of the reactor to be 30 ℃ under the stirring condition, introducing 3.5L/min of chlorine, and reacting for 3 h.

And step S3: slowly raising the temperature of the bromine generator, controlling the temperature at 60 ℃ and the pressure at 0.03MPa, evaporating bromine, and removing water in the bromine through a drying tower.

And step S4: the bromine flow after drying was controlled to 1.2m³The mixture was introduced into a fixed bed preheated to 380 ℃ and packed with catalyst, the amount of hydrogen being 2m³And h, preparing a crude hydrogen bromide product.

And step S5: cooling the crude hydrogen bromide by cooling water, wherein the condensation temperature is normal temperature, and the condensed hydrogen bromide enters an adsorption column filled with an AW-300 acid-resistant molecular sieve adsorbent to remove water.

And step S6: the dehydrated hydrogen bromide enters a primary rectifying tower to remove light components with low boiling points such as carbon dioxide, carbon monoxide, hydrogen, chlorine and the like, the rectifying temperature is controlled between minus 30 ℃ and minus 50 ℃, and the pressure is 0.2 MPa to 0.4 MPa. Removing light-component hydrogen bromide, feeding the hydrogen bromide into a secondary rectifying tower, controlling the temperature of the secondary rectifying tower at-20 to-50 ℃ and the pressure of the secondary rectifying tower at 0.2 to 0.5Mpa, removing water and bromine impurities with higher boiling points, obtaining high-purity hydrogen bromide at the tower top, condensing the high-purity hydrogen bromide in a condenser by liquid nitrogen, and feeding the high-purity hydrogen bromide into a steel cylinder for filling.

Example 5

And step S1: under the protection of nitrogen gas, a 30% potassium bromide solution is prepared.

And step S2: purging all containers after cleaning and drying by nitrogen, adding 2.5kg of potassium bromide solution into a bromine generator under the nitrogen protection atmosphere, controlling the temperature of the reactor to be 20 ℃ under the stirring condition, introducing 1.2L/min of chlorine, and reacting for 3 h.

And step S3: slowly raising the temperature of the bromine generator, controlling the temperature at 60 ℃ and the pressure at 0.03MPa, evaporating bromine, and removing water in the bromine through a drying tower.

And step S4: the bromine flow after drying was controlled to 1.3m³H entryTo a fixed bed preheated to 360 ℃ and packed with catalyst, in which case the amount of hydrogen fed is 2.5m³And h, preparing a crude hydrogen bromide product.

And step S5: cooling the crude hydrogen bromide by cooling water, wherein the condensation temperature is normal temperature, and the condensed hydrogen bromide enters an adsorption column filled with an AW-300 acid-resistant molecular sieve adsorbent to remove water.

And step S6: the dehydrated hydrogen bromide enters a primary rectifying tower to remove light components with low boiling points such as carbon dioxide, carbon monoxide, hydrogen, chlorine and the like, the rectifying temperature is controlled between minus 30 ℃ and minus 50 ℃, and the pressure is 0.2 MPa to 0.4 MPa. Removing light-component hydrogen bromide, feeding the hydrogen bromide into a secondary rectifying tower, controlling the temperature of the secondary rectifying tower at-20 to-50 ℃ and the pressure of the secondary rectifying tower at 0.2 to 0.5Mpa, removing water and bromine impurities with higher boiling points, obtaining high-purity hydrogen bromide at the tower top, condensing the high-purity hydrogen bromide in a condenser by liquid nitrogen, and feeding the high-purity hydrogen bromide into a steel cylinder for filling.

Example 6

And step S1: under the protection of nitrogen gas, a 30% potassium bromide solution is prepared.

And step S2: purging all containers after cleaning and drying by nitrogen, adding 2.5kg of potassium bromide solution into a bromine generator under the nitrogen protection atmosphere, controlling the temperature of the reactor to be 20 ℃ under the stirring condition, introducing 1.2L/min of chlorine, and reacting for 2.5 h.

And step S3: slowly raising the temperature of the bromine generator, controlling the temperature at 62 ℃ and the pressure at 0.03MPa, evaporating bromine, and removing water in the bromine through a drying tower.

And step S4: the bromine flow after drying was controlled to 1.3m³H into a fixed bed preheated to 360 ℃ and filled with catalyst, the amount of hydrogen fed in at this time being 3m³And h, preparing a crude hydrogen bromide product.

And step S5: cooling the crude hydrogen bromide by cooling water, wherein the condensation temperature is normal temperature, and the condensed hydrogen bromide enters an adsorption column filled with an AW-300 acid-resistant molecular sieve adsorbent to remove water.

And step S6: the dehydrated hydrogen bromide enters a primary rectifying tower to remove light components with low boiling points such as carbon dioxide, carbon monoxide, hydrogen, chlorine and the like, the rectifying temperature is controlled between-25 ℃ and-50 ℃, and the pressure is 0.2-0.5 MPa. Removing light-component hydrogen bromide, feeding the hydrogen bromide into a secondary rectifying tower, controlling the temperature of the secondary rectifying tower at-20 to-50 ℃ and the pressure of the secondary rectifying tower at 0.2 to 0.5Mpa, removing water and bromine impurities with higher boiling points, obtaining high-purity hydrogen bromide at the tower top, condensing the high-purity hydrogen bromide in a condenser by liquid nitrogen, and feeding the high-purity hydrogen bromide into a steel cylinder for filling.

TABLE 1 impurity level and purity (ppm in units) in the products of the examples

As can be seen from Table 1, the purities of the hydrogen bromides of examples 1-6 all reached over 99.999%, with example 4 being the best because of the better reactant concentration ratios, the better reaction times and temperatures compared to the other examples. The preparation method can be used for preparing high-purity hydrogen bromide with the purity of more than 99.999 percent and can meet the high-purity requirement of semiconductors.

Example 7

A synthetic purification device of high-purity hydrogen bromide is shown in figure 1 and comprises a raw material supply unit, a bromine generation and drying unit, a bromination synthesis device, a hydrogen bromide purification device and a finished product filling unit, wherein the raw material supply unit comprises a hydrogen cylinder 1 and a chlorine cylinder 2, the bromine generation and drying unit comprises a bromine generator 3 and a bromine drying tower 4, the chlorine cylinder 2 is connected to the bromine generator 3 through a pipeline, the bromine generator 3 is connected to the bromine drying tower 4 through a pipeline, chlorine and metal bromide aqueous solution react in the bromine generator 3 to generate bromine, and the bromine enters the bromine drying tower 4 to be dehydrated. The bromination synthesis device comprises a fixed bed 5, the fixed bed 5 is positioned in a high-temperature heating furnace, a bromine drying tower 4 and a hydrogen cylinder 1 are respectively connected to the fixed bed 5 loaded with a platinum-loaded silica catalyst or a platinum-loaded alumina catalyst through pipelines, the fixed bed 5 is connected to a hydrogen bromide purification device through a pipeline, the catalyst is preheated in the fixed bed 5 and is preheated, at the moment, bromine and hydrogen are introduced, and the bromine and the hydrogen are converted into hydrogen bromide at high temperature under the action of the catalyst.

The hydrogen bromide purification device is connected to the finished product filling unit through a pipeline. The hydrogen bromide purification device comprises a condenser 6, a first adsorption column 7, a second adsorption column 8, a rectifying tower A9 and a rectifying tower B10, wherein the condenser 6 is connected to the first adsorption column 7 through a pipeline, the first adsorption column 7 is connected to the second adsorption column 8 through a pipeline, the first adsorption column 7 is connected to a rectifying tower A9 through a pipeline, and a tower kettle of the rectifying tower A9 is connected to a rectifying tower B10 through a pipeline. The hydrogen bromide is condensed by a condenser 6, the condensed hydrogen bromide enters an adsorption column I7 and an adsorption column II 8 for two-stage dehydration, and fillers of the adsorption column I7 and the adsorption column II 8 are AW-300 acid-resistant molecular sieves. And (3) feeding the dry hydrogen bromide from the second adsorption column 8 into a rectifying tower A9 to remove light components such as hydrogen, nitrogen, carbon dioxide, carbon monoxide and the like in the hydrogen bromide. The material from the tower bottom enters a rectifying tower B10 to remove heavy components such as bromine, water and the like, and a qualified finished product is obtained at the tower top.

The finished product filling unit comprises a buffer tank 11 and a finished product bottle 12, the top of the rectifying tower B10 is connected to the buffer tank 11, the buffer tank 11 is connected to the finished product bottle 12 through a pipeline, and an electric heating device is arranged on the outer side of the buffer tank 11. Qualified finished products obtained from the rectifying tower B10 enter a buffer tank 11 to be collected, qualified finished product hydrogen bromide in the buffer tank 11 is filled into a finished product bottle 12 through pressure difference, and the pressure of the buffer tank 11 is increased in the process through an electric heating mode.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.