CN211522070U - Reaction system for producing chloroacetic acid by pressurization method - Google Patents
Reaction system for producing chloroacetic acid by pressurization method Download PDFInfo
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- CN211522070U CN211522070U CN201922265758.9U CN201922265758U CN211522070U CN 211522070 U CN211522070 U CN 211522070U CN 201922265758 U CN201922265758 U CN 201922265758U CN 211522070 U CN211522070 U CN 211522070U
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Abstract
The utility model discloses a reaction system for producing chloroacetic acid by a pressurization method, which comprises a feed pump, a chlorination reaction kettle, a condenser and a gas absorption tower; the feeding pump comprises an acetic acid feeding pump and a liquid chlorine feeding pump, the acetic acid feeding pump is communicated with a feeding port at the upper end of the chlorination reaction kettle through a pipeline, the liquid chlorine feeding pump is communicated with the lower end of an inner cavity of the chlorination reaction kettle through a pipeline, the top of the chlorination reaction kettle is also connected with an inlet end of a condenser through a gas phase pipeline, the bottom end of the condenser is communicated with the inner cavity of the chlorination reaction kettle through a liquid phase backflow pipeline, and a section of U-shaped pipe is arranged on the liquid phase backflow pipeline; the top of the condenser is communicated with the gas absorption tower through a pipeline, and a pressure reducing valve is arranged on the pipeline; the reaction system provided by the utility model can greatly improve the chlorination reaction rate of acetic acid, shorten the reaction time and improve the space-time yield; the method can use liquid chlorine to replace gaseous chlorine as a raw material, does not need a liquid chlorine vaporizing device, reduces reaction heat and reduces production cost.
Description
Technical Field
The utility model relates to a reaction system of chloroacetic acid, specific theory relates to a reaction system of pressurization method production chloroacetic acid belongs to chemical industry equipment technical field.
Background
Chloroacetic acid is a colorless or white crystalline organic carboxylic acid, is an important Chinese body in fine chemical industry, is mainly used for producing pesticides, carboxymethyl cellulose, medicines, fuels and other fine organic products, and can be produced by a trichloroethylene hydrolysis method, a chloroacetyl chloride method and an acetic acid catalytic chlorination method.
At present, the acetic anhydride catalytic chlorination method is generally adopted at home and abroad for producing chloroacetic acid, and the acetic anhydride catalytic chlorination method is divided into an intermittent production process and a continuous production process, and the two production methods have the advantages and the disadvantages respectively, and have simple intermittent production equipment, less investment, longer reaction time and lower efficiency; the continuous production process can improve the production efficiency and increase the yield, but the reaction equipment is more complex and the investment cost is high.
At present, related patents improve the existing intermittent production process, for example, CN208717198U discloses an intermittent production process, in which steps of chlorination reaction, crystallization, centrifugal separation and the like are connected by pipelines to realize intermittent production of acetic acid chlorination; patent CN208591836 discloses a tank reactor, which can introduce chlorine gas into a reaction solution along with a lining pipe channel of a stirring device, and can realize sufficient mixing of gas and liquid, thereby improving reaction efficiency and yield; however, the devices disclosed in the above patents are all process methods for producing chloroacetic acid by acetic acid catalytic chlorination under normal pressure, the reaction time is still long, and the defect of low intermittent production efficiency is not fundamentally solved.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a reaction system for producing chloroacetic acid by a pressurization method, which can greatly improve the chlorination reaction rate of acetic acid, shorten the reaction time and improve the space-time yield; the method can use liquid chlorine to replace gaseous chlorine as a raw material, does not need a liquid chlorine vaporizing device, reduces reaction heat and reduces production cost.
For solving the technical problem, the utility model discloses a following technical scheme:
a reaction system for producing chloroacetic acid by a pressurization method comprises a feed pump, a chlorination reaction kettle, a condenser and a gas absorption tower; the feeding pump comprises an acetic acid feeding pump and a liquid chlorine feeding pump, the acetic acid feeding pump is communicated with a feeding port at the upper end of the chlorination reaction kettle through a pipeline, the liquid chlorine feeding pump is communicated with the lower end of an inner cavity of the chlorination reaction kettle through a pipeline, the lower end of the inner cavity of the chlorination reaction kettle is also communicated with the discharging pump through a pipeline, the top of the chlorination reaction kettle is also connected with an inlet end of a condenser through a gas phase pipeline, the bottom end of the condenser is communicated with the inner cavity of the chlorination reaction kettle through a liquid phase backflow pipeline, and a section of U-; the top of the condenser is communicated with the gas absorption tower through a pipeline, and a pressure reducing valve is installed on the pipeline.
Further, the condenser is arranged above the chlorination reaction kettle.
Furthermore, a heat exchange jacket is arranged outside the chlorination reaction kettle, a stirring device is arranged in an inner cavity of the chlorination reaction kettle, and a temperature sensor is further arranged on the inner wall of the chlorination reaction kettle.
Furthermore, the chlorination reaction kettle and the pipeline lining connected with the feeding pump are made of glass-lined steel, tetrafluoroethylene or graphite.
Furthermore, the lining of the condenser is made of glass lining or graphite.
The utility model adopts the above technical scheme after, compare with prior art, have following advantage:
the reaction system for producing chloroacetic acid by the pressurization method can enable acetic acid and chlorine to react under the catalysis condition of acetic anhydride under certain high pressure and temperature conditions, and greatly accelerates the reaction speed due to high temperature and high reaction pressure, so that the space-time yield is greatly improved, and the utilization rate of equipment is improved; in addition, liquid chlorine is used for replacing gaseous chlorine as a raw material to carry out chlorination reaction of acetic acid, a liquid chlorine vaporization device is omitted, reaction heat is reduced, and production cost is further reduced.
The present invention will be described in detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
in the figure, the position of the upper end of the main shaft,
1-chlorination reaction kettle, 2-heat exchange jacket, 3-stirring device, 4-acetic acid feeding pump, 5-liquid chlorine feeding pump, 6-discharging pump, 7-condenser, 8-gas phase pipeline, 9-liquid phase reflux pipeline, 10-U-shaped pipe, 11-gas absorption tower and 12-pressure reducing valve.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
EXAMPLE 1 reaction System for producing chloroacetic acid by pressurization method
As shown in fig. 1, the utility model provides a reaction system for producing chloroacetic acid by a pressurization method, which comprises a feed pump, a chlorination reactor 1, a condenser 7 and a gas absorption tower 11; the feeding pump comprises an acetic acid feeding pump 4 and a liquid chlorine feeding pump 5, the acetic acid feeding pump 4 is communicated with a feeding port at the upper end of the chlorination reaction kettle 1 through a pipeline, the acetic acid feeding pump 4 is used for conveying liquid raw material acetic acid and catalyst acetic anhydride, and the liquid raw material acetic acid and the catalyst acetic anhydride are uniformly mixed as required before being conveyed; the liquid chlorine feeding pump 5 is communicated with the lower end of the inner cavity of the chlorination reaction kettle 1 through a pipeline.
The chlorination reaction kettle 1 and the pipeline lining connected with the feeding pump are made of glass-lined steel, tetrafluoroethylene or graphite, and the glass-lined steel is preferably selected; the chlorination reaction kettle 1 is characterized in that a heat exchange jacket 2 is arranged outside the chlorination reaction kettle 1, a stirring device 3 is arranged in an inner cavity of the chlorination reaction kettle 1, a temperature sensor is further arranged on the inner wall of the chlorination reaction kettle 1 and used for detecting the temperature of acetic acid chlorination reaction, the temperature sensor is electrically connected with a temperature control system, and the temperature control system is used for controlling the temperature of the acetic acid chlorination reaction; the lower end of the inner cavity of the chlorination reaction kettle 1 is also communicated with a discharge pump 6 through a pipeline.
The top of the chlorination reaction kettle 1 is also connected with the inlet end of a condenser 7 through a gas phase pipeline 8, the condenser 7 is arranged above the chlorination reaction kettle 1, and the gas phase pipeline 8 is a riser of the chlorination reaction kettle 1; the bottom end of the condenser 7 is communicated with the inner cavity of the chlorination reaction kettle 1 through a liquid phase return pipeline 9, liquid drops condensed by the condenser 7 flow back to the chlorination reaction kettle 1 under the action of gravity, so that the pressure of the condenser 7 and the chlorination reaction kettle 1 is balanced, and the liquid phase return pipeline 9 is provided with a section of U-shaped pipe 10.
Cooling is carried out in the condenser 7 by introducing cold water for circulation; the lining material of the condenser 7 is glass lining and graphite material, and the graphite material is preferred; the top of the condenser 7 is communicated with a gas absorption tower 11 through a pipeline, a pressure reducing valve 12 is arranged on the pipeline, and the pressure reducing valve 12 is used for controlling the system pressure of the chlorination reaction kettle 1; the gas absorption tower 11 is used for absorbing a byproduct hydrogen chloride gas generated in the chlorination reaction process, and the hydrogen chloride gas is absorbed into hydrochloric acid in the gas absorption tower 11.
The utility model discloses a concrete theory of operation:
acetic acid raw materials and acetic anhydride are uniformly mixed in proportion and then enter a chlorination reaction kettle 1 through an acetic acid feed pump 4, liquid chlorine is pumped into the chlorination reaction kettle 1 through a liquid chlorine feed pump 5, the system pressure is controlled to 250 kpa through a pressure reducing valve 12, the temperature of the chlorination reaction kettle 1 is set to be 115-fold-over-120 ℃, then the acetic acid and the liquid chlorine are subjected to chlorination reaction in the chlorination reaction kettle 1, intermediate products and partial raw materials generated in the reaction process are condensed into a liquid phase reflux pipeline 9 below a condenser 7 through the condenser 7, and hydrogen chloride gas generated as a byproduct in the reaction process is absorbed into hydrochloric acid in a gas absorption tower 11; and after the reaction is finished, pumping out the materials from the bottom of the chlorination reaction kettle 1 through a discharge pump 6, and crystallizing and centrifugally separating the pumped materials to obtain a chloroacetic acid product.
The reaction system for producing chloroacetic acid by the pressurization method provided by the utility model can greatly improve the chlorination reaction rate of acetic acid, shorten the reaction time and improve the space-time yield through certain high pressure and temperature conditions; the method can use liquid chlorine to replace gaseous chlorine as a raw material, does not need a liquid chlorine vaporizing device, reduces reaction heat and reduces production cost.
The foregoing is illustrative of the best mode of the invention, and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical teaching of the present invention is also within the protection scope of the present invention.
Claims (5)
1. A reaction system for producing chloroacetic acid by a pressurization method is characterized in that: comprises a feed pump, a chlorination reaction kettle (1), a condenser (7) and a gas absorption tower (11); the feeding pump comprises an acetic acid feeding pump (4) and a liquid chlorine feeding pump (5), the acetic acid feeding pump (4) is communicated with a feeding port at the upper end of the chlorination reaction kettle (1) through a pipeline, the liquid chlorine feeding pump (5) is communicated with the lower end of an inner cavity of the chlorination reaction kettle (1) through a pipeline, the lower end of the inner cavity of the chlorination reaction kettle (1) is also communicated with a discharging pump (6) through a pipeline, the top of the chlorination reaction kettle (1) is also connected with an inlet end of a condenser (7) through a gas phase pipeline (8), the bottom end of the condenser (7) is communicated with the inner cavity of the chlorination reaction kettle (1) through a liquid phase backflow pipeline (9), and a section of U-shaped pipe (10) is arranged; the top of the condenser (7) is communicated with the gas absorption tower (11) through a pipeline, and a pressure reducing valve (12) is installed on the pipeline.
2. A pressurized chloroacetic acid production reaction system as in claim 1, further comprising: the condenser (7) is arranged above the chlorination reaction kettle (1).
3. A pressurized chloroacetic acid production reaction system as in claim 1, further comprising: the outer portion of the chlorination reaction kettle (1) is provided with a heat exchange jacket (2), the inner cavity of the chlorination reaction kettle (1) is provided with a stirring device (3), and the inner wall of the chlorination reaction kettle (1) is also provided with a temperature sensor.
4. A pressurized chloroacetic acid production reaction system as in claim 1, further comprising: the chlorination reaction kettle (1) and the pipeline lining connected with the feeding pump are made of glass-lined steel, tetrafluoroethylene or graphite.
5. A pressurized chloroacetic acid production reaction system as in claim 1, further comprising: the lining of the condenser (7) is made of glass lining or graphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922265758.9U CN211522070U (en) | 2019-12-17 | 2019-12-17 | Reaction system for producing chloroacetic acid by pressurization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922265758.9U CN211522070U (en) | 2019-12-17 | 2019-12-17 | Reaction system for producing chloroacetic acid by pressurization method |
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| Publication Number | Publication Date |
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| CN211522070U true CN211522070U (en) | 2020-09-18 |
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| CN201922265758.9U Active CN211522070U (en) | 2019-12-17 | 2019-12-17 | Reaction system for producing chloroacetic acid by pressurization method |
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