1. A method for synthesizing 2-ethylhexoic acid chloride by reacting 2-ethylhexanoic acid with phosgene is characterized in that: the processing method comprises the following steps:

preparation of the gas mixture: preparing chlorine and carbon monoxide with certain volume fractions, introducing the chlorine into a feeding tank where the carbon monoxide is located, preparing a reactor, filling activated carbon between the inner walls of the reactor, enabling the side of the activated carbon to be in close contact with the inner wall of the reactor, and finally introducing the carbon monoxide mixture introduced with the chlorine into the reactor through the activated carbon to obtain a gas mixture;

preparation of phosgene: introducing the gas mixture into a mixing box, and discharging the redundant carbon monoxide of the tail gas flow through pressure regulation of a pressure regulating valve to leave phosgene;

2-Synthesis of ethylhexanoyl chloride: introducing 2-ethylhexanoic acid into a mixing box, sealing the mixing box, carrying out rotary shaking on the mixing box at the temperature of 20-30 ℃, and mixing the gas;

storage of 2-ethylhexanoyl chloride: and (3) the mixed gas enters a storage chamber through a pipeline with a drying agent, and is stored at normal temperature for use.

2. The method for synthesizing 2-ethylhexanoic acid and phosgene by reaction of claim 1, wherein: in the step of preparing the gas mixture, it is prepared that carbon monoxide is introduced in a stoichiometric excess to chlorine.

3. The method for synthesizing 2-ethylhexanoic acid and phosgene by reaction of claim 1, wherein: in the preparation of the gas mixture, the bottom of the reactor is provided with a small hole and communicated with a negative pressure pipe, and the negative pressure pipe is connected with a negative pressure device.

4. The method for synthesizing 2-ethylhexanoic acid and phosgene by reaction of claim 1, wherein: in the phosgene preparation step, when the gas mixture is transferred from the container to the mixing box, a tetrafluoro-lined or enamel-lined pipe, a valve and a pump are used.

5. The method for synthesizing 2-ethylhexanoic acid and phosgene by reaction of claim 1, wherein: in the step of storing the 2-ethylhexoyl chloride, the drying agent is filled in a certain section of the pipeline, and the pipeline adopts a tetrafluoro lining or an enamel lining.

6. The method for synthesizing 2-ethylhexanoic acid and phosgene by reaction of claim 1, wherein: in the storage step of the 2-ethylhexanoyl chloride, the drying agent consists of the following raw materials in parts by weight: 4-6 parts of anhydrous calcium chloride, 6-12 parts of polyacrylamide and 0.4-0.8 part of plant starch.

7. The method for synthesizing 2-ethylhexanoic acid and phosgene of claim 6, wherein: the drying agent is composed of the following raw materials in parts by weight: 5 parts of anhydrous calcium chloride, 9 parts of polyacrylamide and 0.6 part of plant starch.

Background

2-ethylhexanoyl chloride is in the form of a light-colored transparent liquid, has a strong pungent odor, is an active intermediate, and is used for the production of agricultural chemicals and medicines, and also for the production of peroxyesters. Note that: storing in cool, dry and well ventilated place, and reducing the condensation of toxic gas. The EHCL is secured away from water, heat sources, and ignition sources, preventing a fire or explosion.

The 2-ethylhexanoyl chloride is not easy to store due to slight toxicity, strong pungent smell and easy explosion, so that the 2-ethylhexanoyl chloride needs to be used at present.

Disclosure of Invention

The invention aims to provide a method for synthesizing 2-ethylhexanoic acid by reacting 2-ethylhexanoic acid with phosgene, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a method for synthesizing 2-ethylhexanoic acid chloride by reacting 2-ethylhexanoic acid with phosgene comprises the following processing methods:

preparation of the gas mixture: preparing chlorine and carbon monoxide with certain volume fractions, introducing the chlorine into a feeding tank where the carbon monoxide is located, preparing a reactor, filling activated carbon between the inner walls of the reactor, enabling the side of the activated carbon to be in close contact with the inner wall of the reactor, and finally introducing the carbon monoxide mixture introduced with the chlorine into the reactor through the activated carbon to obtain a gas mixture;

preparation of phosgene: introducing the gas mixture into a mixing box, and discharging the redundant carbon monoxide of the tail gas flow through pressure regulation of a pressure regulating valve to leave phosgene;

2-Synthesis of ethylhexanoyl chloride: introducing 2-ethylhexanoic acid into a mixing box, sealing the mixing box, carrying out rotary shaking on the mixing box at the temperature of 20-30 ℃, and mixing the gas;

storage of 2-ethylhexanoyl chloride: and (3) the mixed gas enters a storage chamber through a pipeline with a drying agent, and is stored at normal temperature for use.

Preferably, in the step of preparing the gas mixture, the carbon monoxide is introduced in a stoichiometric excess to the chlorine.

Preferably, in the preparation of the gas mixture, the bottom of the reactor is provided with a small hole and communicated with a negative pressure pipe, and the negative pressure pipe is connected with a negative pressure device.

Preferably, in the step of preparing phosgene, a tetrafluoro-lined or enamel-lined pipe, valve and pump are used for transferring the gas mixture from the container to the mixing tank.

Preferably, in the step of storing the 2-ethylhexanoyl chloride, the drying agent is filled in a certain section of the pipeline, and the pipeline adopts a tetrafluoro lining or an enamel lining.

Preferably, in the storage step of the 2-ethylhexanoyl chloride, the drying agent consists of the following raw materials in parts by weight: 4-6 parts of anhydrous calcium chloride, 6-12 parts of polyacrylamide and 0.4-0.8 part of plant starch.

Preferably, the drying agent consists of the following raw materials in parts by weight: 5 parts of anhydrous calcium chloride, 9 parts of polyacrylamide and 0.6 part of plant starch.

Compared with the prior art, the invention has the beneficial effects that: the invention adopts the existing mode, reduces the storage time of the 2-ethylhexanoyl chloride, uses a small amount of 2-ethylhexanoyl chloride, avoids gas leakage and explosion danger caused by long-time storage of the 2-ethylhexanoyl chloride, and is safer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

Example one

The invention provides a technical scheme that: a method for synthesizing 2-ethylhexanoic acid chloride by reacting 2-ethylhexanoic acid with phosgene comprises the following processing methods:

preparation of the gas mixture: preparing chlorine and carbon monoxide with certain volume fractions, introducing the chlorine into a feeding tank where the carbon monoxide is located, preparing a reactor, filling activated carbon between the inner walls of the reactor, enabling the side of the activated carbon to be in close contact with the inner wall of the reactor, and finally introducing the carbon monoxide mixture introduced with the chlorine into the reactor through the activated carbon to obtain a gas mixture;

preparation of phosgene: introducing the gas mixture into a mixing box, and discharging the redundant carbon monoxide of the tail gas flow through pressure regulation of a pressure regulating valve to leave phosgene;

2-Synthesis of ethylhexanoyl chloride: introducing 2-ethylhexanoic acid into a mixing box, sealing the mixing box, carrying out rotary shaking on the mixing box at the temperature of 20-30 ℃, and mixing the gas;

storage of 2-ethylhexanoyl chloride: and (3) the mixed gas enters a storage chamber through a pipeline with a drying agent, and is stored at normal temperature for use.

Further, in the step of preparing the gas mixture, it is prepared that carbon monoxide is introduced in a stoichiometric excess to chlorine.

Furthermore, in the preparation of the gas mixture, the bottom of the reactor is provided with a small hole and communicated with a negative pressure pipe, and the negative pressure pipe is connected with a negative pressure device.

Further, in the phosgene preparation step, a tetrafluoro-lined or enamel-lined pipe, valve and pump are used for transferring the gas mixture from the container to the mixing tank.

Furthermore, in the storage step of the 2-ethyl hexanoyl chloride, the drying agent is filled in certain sections of the pipeline, and the pipeline adopts a tetrafluoro lining or an enamel lining.

Further, in the storage step of the 2-ethylhexanoyl chloride, the drying agent consists of the following raw materials in parts by weight: 4-6 parts of anhydrous calcium chloride, 6-12 parts of polyacrylamide and 0.4-0.8 part of plant starch.

Further, the drying agent is composed of the following raw materials in parts by weight: 4 parts of anhydrous calcium chloride, 6 parts of polyacrylamide and 0.4 part of plant starch.

Example two

The invention provides a technical scheme that: a method for synthesizing 2-ethylhexanoic acid chloride by reacting 2-ethylhexanoic acid with phosgene comprises the following processing methods:

preparation of the gas mixture: preparing chlorine and carbon monoxide with certain volume fractions, introducing the chlorine into a feeding tank where the carbon monoxide is located, preparing a reactor, filling activated carbon between the inner walls of the reactor, enabling the side of the activated carbon to be in close contact with the inner wall of the reactor, and finally introducing the carbon monoxide mixture introduced with the chlorine into the reactor through the activated carbon to obtain a gas mixture;

preparation of phosgene: introducing the gas mixture into a mixing box, and discharging the redundant carbon monoxide of the tail gas flow through pressure regulation of a pressure regulating valve to leave phosgene;

2-Synthesis of ethylhexanoyl chloride: introducing 2-ethylhexanoic acid into a mixing box, sealing the mixing box, carrying out rotary shaking on the mixing box at the temperature of 20-30 ℃, and mixing the gas;

storage of 2-ethylhexanoyl chloride: and (3) the mixed gas enters a storage chamber through a pipeline with a drying agent, and is stored at normal temperature for use.

Further, in the step of preparing the gas mixture, it is prepared that carbon monoxide is introduced in a stoichiometric excess to chlorine.

Furthermore, in the preparation of the gas mixture, the bottom of the reactor is provided with a small hole and communicated with a negative pressure pipe, and the negative pressure pipe is connected with a negative pressure device.

Further, in the phosgene preparation step, a tetrafluoro-lined or enamel-lined pipe, valve and pump are used for transferring the gas mixture from the container to the mixing tank.

Furthermore, in the storage step of the 2-ethyl hexanoyl chloride, the drying agent is filled in certain sections of the pipeline, and the pipeline adopts a tetrafluoro lining or an enamel lining.

Further, in the storage step of the 2-ethylhexanoyl chloride, the drying agent consists of the following raw materials in parts by weight: 4-6 parts of anhydrous calcium chloride, 6-12 parts of polyacrylamide and 0.4-0.8 part of plant starch.

Further, the drying agent is composed of the following raw materials in parts by weight: 6 parts of anhydrous calcium chloride, 12 parts of polyacrylamide and 0.8 part of plant starch.

EXAMPLE III

The invention provides a technical scheme that: a method for synthesizing 2-ethylhexanoic acid chloride by reacting 2-ethylhexanoic acid with phosgene comprises the following processing methods:

preparation of the gas mixture: preparing chlorine and carbon monoxide with certain volume fractions, introducing the chlorine into a feeding tank where the carbon monoxide is located, preparing a reactor, filling activated carbon between the inner walls of the reactor, enabling the side of the activated carbon to be in close contact with the inner wall of the reactor, and finally introducing the carbon monoxide mixture introduced with the chlorine into the reactor through the activated carbon to obtain a gas mixture;

preparation of phosgene: introducing the gas mixture into a mixing box, and discharging the redundant carbon monoxide of the tail gas flow through pressure regulation of a pressure regulating valve to leave phosgene;

2-Synthesis of ethylhexanoyl chloride: introducing 2-ethylhexanoic acid into a mixing box, sealing the mixing box, carrying out rotary shaking on the mixing box at the temperature of 20-30 ℃, and mixing the gas;

storage of 2-ethylhexanoyl chloride: and (3) the mixed gas enters a storage chamber through a pipeline with a drying agent, and is stored at normal temperature for use.

Further, in the step of preparing the gas mixture, it is prepared that carbon monoxide is introduced in a stoichiometric excess to chlorine.

Furthermore, in the preparation of the gas mixture, the bottom of the reactor is provided with a small hole and communicated with a negative pressure pipe, and the negative pressure pipe is connected with a negative pressure device.

Further, in the phosgene preparation step, a tetrafluoro-lined or enamel-lined pipe, valve and pump are used for transferring the gas mixture from the container to the mixing tank.

Furthermore, in the storage step of the 2-ethyl hexanoyl chloride, the drying agent is filled in certain sections of the pipeline, and the pipeline adopts a tetrafluoro lining or an enamel lining.

Further, in the storage step of the 2-ethylhexanoyl chloride, the drying agent consists of the following raw materials in parts by weight: 4-6 parts of anhydrous calcium chloride, 6-12 parts of polyacrylamide and 0.4-0.8 part of plant starch.

Further, the drying agent is composed of the following raw materials in parts by weight: 5 parts of anhydrous calcium chloride, 9 parts of polyacrylamide and 0.6 part of plant starch.

The invention adopts the existing mode, reduces the storage time of the 2-ethylhexanoyl chloride, uses a small amount of 2-ethylhexanoyl chloride, avoids gas leakage and explosion danger caused by long-time storage of the 2-ethylhexanoyl chloride, and is safer.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative examples and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any icons in the claims should not be construed as limiting the claim concerned.