1. A method for recycling acetylene purification waste sodium hypochlorite comprises the following steps: step one, degassing treatment; step two, neutralization treatment; step three, cooling; step four, storing and shunting; step five, preparing waste liquid; step six, recycling; step seven, purifying and recycling; the method is characterized in that:

in the first step, firstly, introducing waste sodium hypochlorite generated in the acetylene production process into a degassing device for degassing treatment, so that the mass percentage of acetylene in the waste sodium hypochlorite is 0-0.01%, and storing the removed acetylene in an acetylene gas holder to obtain the waste sodium hypochlorite without acetylene gas for later use;

in the second step, the waste sodium hypochlorite from which the acetylene gas is removed in the first step is introduced into a neutralization tank, and an alkaline solution is added to neutralize the waste sodium hypochlorite to obtain neutralized waste sodium hypochlorite;

in the third step, introducing the neutralized waste sodium hypochlorite obtained in the second step into a cooling tower for cooling;

in the fourth step, the waste sodium hypochlorite cooled in the third step is introduced into a waste liquid pool for storage, then the waste liquid pool is used for shunting the waste sodium hypochlorite through three transport pumps, one part of the waste sodium hypochlorite enters a preparation pool, the other part of the waste sodium hypochlorite flows into a cooling tower for circulating cooling, and the other part of the waste sodium hypochlorite enters a sewage treatment pool;

in the fifth step, a part of the waste sodium hypochlorite in the fourth step enters a preparation pool, and a high-concentration sodium hypochlorite solution is added into the preparation pool to prepare compound sodium hypochlorite for later use;

in the sixth step, the compound sodium hypochlorite prepared in the fifth step is transported to a cleaning tower through a water pump to clean crude acetylene gas;

and in the seventh step, a part of the waste sodium hypochlorite in the fourth step is transported to a sewage treatment tank through a water pump, then the waste sodium hypochlorite is introduced into an oxidation reaction tank for reaction, the reaction product is subjected to preliminary filtration through an activated carbon filtration device after the reaction is finished, and then the reaction product is filtered through a reverse osmosis filtration membrane to obtain purified clear water, and the treated clear water flows back to the waste liquid tank in the fourth step through the water pump, so that the recycling of the waste sodium hypochlorite is finished.

2. The method for recycling acetylene purification waste sodium hypochlorite according to claim 1, wherein the method comprises the steps of: in the first step, the degassing device is a vacuum extraction tower and a negative pressure device, and the vacuum degree of the vacuum extraction tower is-5-0 kPa.

3. The method for recycling acetylene purification waste sodium hypochlorite according to claim 1, wherein the method comprises the steps of: in the second step, the pH value of the neutralized waste sodium hypochlorite is between 7 and 8.

4. The method for recycling acetylene purification waste sodium hypochlorite according to claim 1, wherein the method comprises the steps of: in the third step, the temperature of the cooled waste sodium hypochlorite is 40-60 ℃.

5. The method for recycling acetylene purification waste sodium hypochlorite according to claim 1, wherein the method comprises the steps of: in the fourth step, the volume ratio of the waste sodium hypochlorite flowing into the preparation pool, the waste sodium hypochlorite flowing into the sewage treatment pool and the waste sodium hypochlorite flowing into the cooling tower is 6: 3: 1.

6. The method for recycling acetylene purification waste sodium hypochlorite according to claim 1, wherein the method comprises the steps of: in the fifth step, the concentration of the compound sodium hypochlorite is 0.085-0.12%.

Background

At present, most enterprises introduce a sodium hypochlorite solution into the crude acetylene to oxidize impurities such as hydrogen sulfide and phosphine in the acetylene into acidic substances to be removed, a large amount of waste sodium hypochlorite is generated in the process, the COD content of the water is high, and the water contains sodium carbonate, sodium chloride, sodium sulfide, acetylene and other components, which do not meet the national emission standard and need to be treated.

The treatment of waste sodium hypochlorite on the market at present has two methods, the first is to directly enter a generator to react with calcium carbide, and the other is to prepare with high-concentration sodium hypochlorite to prepare fresh sodium hypochlorite to enter a system to react, although the methods are relatively perfect, certain disadvantages still exist, and the specific problems are as follows:

(1) the first method can lead to accumulation of a large amount of solid chloride in the reactor, which is not beneficial to recycling of carbide slag, and the other method can lead to reaction of residual acetylene and sodium hypochlorite, which is easy to explode, and chloride and phosphide are easy to enrich in the circulating process, so that the pipeline is blocked, and the practicability is reduced;

(2) in the existing treatment process of the waste sodium hypochlorite, a large amount of acidic substances are generated, so that equipment of a recycling system is corroded, and the process difficulty is increased;

(3) in the existing treatment process of the waste sodium hypochlorite, the waste sodium hypochlorite is only prepared into a new sodium hypochlorite solution for circulation, and the recycling efficiency is low.

Disclosure of Invention

The invention aims to provide a recycling method of acetylene purification waste sodium hypochlorite, which aims to solve the problems of pipeline blockage caused by equipment corrosion and compound enrichment and low recycling utilization rate in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme: a method for recycling acetylene purification waste sodium hypochlorite comprises the following steps: step one, degassing treatment; step two, neutralization treatment; step three, cooling; step four, storing and shunting; step five, preparing waste liquid; step six, recycling; step seven, purifying and recycling;

in the first step, firstly, waste sodium hypochlorite generated in the acetylene production process is introduced into a degassing device for degassing treatment, so that the mass percentage of acetylene in the waste sodium hypochlorite is 0-0.01%, the removed acetylene enters an acetylene gas holder for storage, and the obtained waste sodium hypochlorite without acetylene gas is reserved;

in the second step, the waste sodium hypochlorite from which the acetylene gas is removed in the first step is introduced into a neutralization tank, and an alkaline solution is added to neutralize the waste sodium hypochlorite to obtain neutralized waste sodium hypochlorite;

in the third step, introducing the neutralized waste sodium hypochlorite obtained in the second step into a cooling tower for cooling;

in the fourth step, the waste sodium hypochlorite cooled in the third step is introduced into a waste liquid pool for storage, then the waste liquid pool is used for shunting the waste sodium hypochlorite through three transport pumps, one part of the waste sodium hypochlorite enters a preparation pool, the other part of the waste sodium hypochlorite flows into a cooling tower for circulating cooling, and the other part of the waste sodium hypochlorite enters a sewage treatment pool;

in the fifth step, a part of the waste sodium hypochlorite in the fourth step enters a preparation pool, and a high-concentration sodium hypochlorite solution is added into the preparation pool to prepare compound sodium hypochlorite for later use;

in the sixth step, the compound sodium hypochlorite prepared in the fifth step is transported to a cleaning tower through a water pump to clean crude acetylene gas;

and in the seventh step, part of the waste sodium hypochlorite in the fourth step is transported to a sewage treatment tank through a water pump, then the waste sodium hypochlorite is introduced into an oxidation reaction tank for reaction, the reaction is primarily filtered through an activated carbon filtering device after the reaction is finished, and then the reaction is filtered through a reverse osmosis membrane to obtain purified clean water, and the treated clean water flows back to the waste liquid tank in the fourth step through the water pump, so that the recycling of the waste sodium hypochlorite is finished.

Optionally, in the first step, the degassing device is a vacuum extraction tower and a negative pressure device, and the vacuum degree of the vacuum extraction tower is-5-0 kPa.

Optionally, in the second step, the pH of the neutralized waste sodium hypochlorite is between 7 and 8.

Optionally, in the third step, the temperature of the cooled waste sodium hypochlorite is 40-60 ℃.

Optionally, in the fourth step, the volume ratio of the waste sodium hypochlorite flowing into the preparation tank, the waste sodium hypochlorite flowing into the sewage treatment tank and the waste sodium hypochlorite flowing into the cooling tower is 6: 3: 1.

Optionally, in the fifth step, the concentration of the compound sodium hypochlorite is 0.085-0.12%.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the invention, a part of waste sodium hypochlorite in the waste liquid pool is subjected to oxidation reaction, activated carbon filtration and reverse osmosis membrane filtration to obtain treated purified water, and then the purified water flows back into the waste liquid pool, so that the enrichment of chloride and phosphide in equipment is avoided, the equipment blockage condition is avoided, and the equipment operation safety is improved;

(2) according to the invention, the waste sodium hypochlorite is subjected to neutralization reaction, so that the pH value of the waste sodium hypochlorite is kept between 7 and 8, the phenomenon that the waste sodium hypochlorite corrodes equipment is avoided, and the stable operation of the equipment is favorably ensured;

(3) according to the invention, the waste sodium hypochlorite is shunted, the waste sodium hypochlorite injected into the cooling tower is recycled as cooling water, the waste sodium hypochlorite injected into the preparation pool and high-concentration sodium hypochlorite are compounded into a new sodium hypochlorite solution, and then the new sodium hypochlorite solution enters the system for recycling, so that the recycling degree of the waste sodium hypochlorite is favorably improved, and the environment is favorably protected.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a flow chart of a method for recycling acetylene purification waste sodium hypochlorite according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a method for recycling acetylene purification waste sodium hypochlorite comprises the following steps: step one, degassing treatment; step two, neutralization treatment; step three, cooling; step four, storing and shunting; step five, preparing waste liquid; step six, recycling; and seventhly, purifying and recycling.

In the first step, firstly, the waste sodium hypochlorite generated in the acetylene production process is introduced into a degassing device for degassing treatment, the degassing device comprises a vacuum extraction tower and a negative pressure device, the vacuum degree of the vacuum extraction tower is-5-0 kPa, so that the mass percentage of acetylene in the waste sodium hypochlorite is 0-0.01%, and the removed acetylene enters an acetylene gas cabinet for storage to obtain the waste sodium hypochlorite without acetylene gas for later use.

And in the second step, introducing the waste sodium hypochlorite from which the acetylene gas is removed in the first step into a neutralization tank, adding an alkaline solution to neutralize the waste sodium hypochlorite, wherein the pH value of the neutralized waste sodium hypochlorite is 7-8, so as to obtain the neutralized waste sodium hypochlorite.

And in the third step, introducing the neutralized waste sodium hypochlorite obtained in the second step into a cooling tower for cooling, wherein the temperature of the cooled waste sodium hypochlorite is 40-60 ℃.

And in the fourth step, introducing the waste sodium hypochlorite cooled in the third step into a waste liquid pool for storage, shunting the waste sodium hypochlorite by the waste liquid pool through three transport pumps, introducing part of the waste sodium hypochlorite into a preparation pool, introducing part of the waste sodium hypochlorite into a cooling tower for circulating cooling, introducing part of the water into a sewage treatment pool, and controlling the volume ratio of the waste sodium hypochlorite flowing into the preparation pool, the waste sodium hypochlorite flowing into the sewage treatment pool and the waste sodium hypochlorite flowing into the cooling tower to be 6: 3: 1.

In the fifth step, a part of the waste sodium hypochlorite in the fourth step enters a preparation pool, and a high-concentration sodium hypochlorite solution is added into the preparation pool to prepare compound sodium hypochlorite for later use, wherein the concentration of the compound sodium hypochlorite is 0.085-0.12%.

And in the sixth step, the compound sodium hypochlorite prepared in the fifth step is transported to a cleaning tower through a water pump to clean the crude acetylene gas.

And in the seventh step, a part of the waste sodium hypochlorite in the fourth step is transported to a sewage treatment tank through a water pump, then the waste sodium hypochlorite is introduced into an oxidation reaction tank for reaction, the reaction product is subjected to preliminary filtration through an activated carbon filtration device after the reaction is finished, and then the reaction product is filtered through a reverse osmosis filtration membrane to obtain purified clear water, and the treated clear water flows back to the waste liquid tank in the fourth step through the water pump, so that the recycling of the waste sodium hypochlorite is finished.

Based on the above, the invention has the advantages that the waste sodium hypochlorite is filled into the neutralization tank for neutralization reaction, the corrosion of acid substances in the waste sodium hypochlorite on equipment is effectively avoided, the service life of the equipment is prolonged, meanwhile, in the treatment process, the waste sodium hypochlorite in the waste liquid pool is divided into three parts, one part of the waste sodium hypochlorite enters the cooling tower to be recycled as a coolant, the other part of the waste sodium hypochlorite enters the preparation pool to be compounded with high-concentration sodium hypochlorite to prepare a new sodium hypochlorite solution, the new sodium hypochlorite solution enters the cleaning tower to be recycled, the recycling degree of the waste sodium hypochlorite is favorably improved, the environment is favorably protected, the other part of the waste sodium hypochlorite enters the sewage treatment pool to be prepared into clear water through oxidation-reduction reaction, activated carbon filtration and reverse osmosis membrane filtration, and then the clear water flows back to enter the waste liquid pool to be mixed, so that the enrichment of chloride and phosphide in the equipment is reduced, the situation of equipment blockage is avoided.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.