CN217287208U

CN217287208U - Methyl ester vacuum rectification device for chloroacetic acid production

Info

Publication number: CN217287208U
Application number: CN202220161050.8U
Authority: CN
Inventors: 杨肖涛; 商二继
Original assignee: Jiyuan Hengtong High And New Material Co ltd
Current assignee: Jiyuan Hengtong High And New Material Co ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-08-26
Anticipated expiration: 2032-01-21

Abstract

The utility model discloses a methyl ester vacuum distillation device is used in chloroacetic acid production, including the partition wall rectifying column, the top of partition wall rectifying column is equipped with the top of the tower, the bottom of partition wall rectifying column is equipped with the tower cauldron, there is the vacuum pump at the top of the tower through the pipe connection, the bottom of tower cauldron is equipped with heating element, the center is equipped with the division board perpendicularly in the partition wall rectifying column, the top right side of division board is equipped with the shrouding, the left side of division board is equipped with the packing layer, from last chloroacetic acid inlet pipe, the methyl alcohol inlet pipe of down being equipped with in proper order on the lateral wall of partition wall rectifying column, the top on the top of the tower is equipped with the light phase connecting pipe, the light phase connecting pipe is connected with the light phase condenser, the right side of partition wall rectifying column, the below of going up the shrouding are equipped with the heavy phase connecting pipe. The methyl chloroacetate vacuum rectification device for producing chloroacetic acid utilizes the advantages of the reaction rectification bulkhead tower to prepare methyl chloroacetate, and has high equipment integration level and low energy consumption.

Description

Methyl ester vacuum rectification device for chloroacetic acid production

Technical Field

The utility model belongs to the technical field of methyl chloroacetate production facility, especially, relate to a methyl ester vacuum rectification device is used in chloroacetic acid production.

Background

Waste liquid, chloroacetic acid mother liquid, generated in the production process of chloroacetic acid is used as a raw material to be esterified with methanol for reaction, and methyl monochloroacetate, methyl dichloroacetate and methyl trichloroacetate are prepared through separation, so that the aims of changing waste into valuables and changing harm into benefit are fulfilled. The process includes an esterification system: mainly used for separating out crude ester; a rectification system: the crude ester which is produced in the esterification procedure and neutralized to neutral is pumped to a rectifying still and is rectified to obtain qualified products through the rectifying still and a rectifying tower under vacuum and reduced pressure. In the field of chemical rectification, a reactive rectification process and a dividing wall column rectification process are two very important process coupling modes. The reactive distillation technology organically combines the reaction and the distillation in a tower, so that the reaction and the separation achieve the purpose of mutual promotion, thereby greatly improving the conversion rate and the production capacity of the reaction; the bulkhead column rectification process is to place a vertical bulkhead in the rectification column, so that 1 rectification column can simultaneously separate a plurality of components, thereby not only reducing the energy consumption of the process, but also saving the investment of equipment. Chinese patent No. CN104592021A discloses a reactive distillation method for preparing methyl chloroacetate, which combines the advantages of a reactive distillation bulkhead tower to design a vacuum distillation device for preparing methyl chloroacetate so as to meet the production requirements and is very important.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model provides a methyl ester vacuum rectification device for chloroacetic acid production.

In order to achieve the above object, the utility model provides a following technical scheme: a methyl ester vacuum rectification device for chloroacetic acid production comprises a dividing wall rectifying tower, wherein the top of the dividing wall rectifying tower is provided with a tower top, the bottom of the dividing wall rectifying tower is provided with a tower kettle, the tower top is connected with a vacuum pump through a pipeline, the bottom of the tower kettle is provided with a heating element, a partition plate is vertically arranged at the center in the dividing wall rectifying tower, an upper sealing plate is arranged on the right side of the top of the partition plate, the left side of the partition plate is provided with a packing layer, the top of the packing layer is provided with a liquid distributor, the bottom of the packing layer is provided with a gas distributor, a chloroacetic acid inlet pipe and a methanol inlet pipe are sequentially arranged on the side wall of the dividing wall rectifying tower from top to bottom, a light phase connecting pipe is arranged at the top of the tower top, the light phase connecting pipe is connected with a light phase condenser, the light phase condenser is connected with the light phase separator, the light phase separator is communicated with the inside of the dividing wall rectifying tower through a return pipe, the lower of the right side of the dividing wall rectifying tower and the upper sealing plate is provided with a heavy phase connecting pipe, the heavy phase connecting pipe is connected with a heavy phase condenser, the heavy phase condenser is connected with a heavy phase separator, and the bottom of the tower kettle is provided with a residual liquid outlet pipe.

Further, the temperature difference between the tower top and the tower kettle is within 30 ℃.

Further, the chloroacetic acid feeding amount of the chloroacetic acid feeding pipe is 42 kmol/h.

Further, the reflux ratio of the light phase separator was 0.6.

Compared with the prior art, the beneficial effects of the utility model are that: the reaction rectifying bulkhead tower is utilized, so that the equipment investment can be saved, and the energy consumption is reduced.

Drawings

Fig. 1 is a schematic diagram of the internal structure of the present invention.

Fig. 2 is a schematic top view of the cross section a-a of fig. 1.

In the figure: 1a dividing wall rectifying tower, 2 a chloroacetic acid feeding pipe, 3 a methanol feeding pipe, 4 heating elements, 5 a gas distributor, 6 a liquid distributor, 7 a packing layer, 8 tower tops, 9 tower kettles, 10 a vacuum pump, 11 an upper sealing plate, 12 partition plates, 13 light phase connecting pipes, 14 a light phase condenser, 15 a light phase separator, 16 a heavy phase connecting pipes, 17 a heavy phase condenser, 18 a heavy phase separator, 19 a residual liquid outlet pipe and 20 a return pipe.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Example (b):

referring to the attached drawings 1-2, a methyl ester vacuum rectification device for chloroacetic acid production comprises a dividing wall rectification tower 1, wherein the top of the dividing wall rectification tower 1 is provided with a tower top 8, the bottom of the dividing wall rectification tower 1 is provided with a tower kettle 9, the tower top 8 is connected with a vacuum pump 10 through a pipeline, the bottom of the tower kettle 9 is provided with a heating element 4, the center of the inside of the dividing wall rectification tower 1 is vertically provided with a partition plate 12, the right side of the top of the partition plate 12 is provided with an upper seal plate 11, the left side of the partition plate 12 is provided with a packing layer 7, the top of the packing layer 7 is provided with a liquid distributor 6, the bottom of the packing layer 7 is provided with a gas distributor 5, the side wall of the dividing wall rectification tower 1 is sequentially provided with a chloroacetic acid feeding pipe 2 and a methanol feeding pipe 3 from top to bottom, the top of the tower top 8 is provided with a light phase connecting pipe 13, the light phase connecting pipe 13 is connected with a light phase condenser 14, the light phase condenser 14 is connected with a light phase separator 15, the light phase separator 15 is communicated with the inside of the dividing wall rectifying tower 1 through a return pipe 20, a heavy phase connecting pipe 16 is arranged on the right side of the dividing wall rectifying tower 1 and below the upper sealing plate 11, the heavy phase connecting pipe 16 is connected with a heavy phase condenser 17, the heavy phase condenser 17 is connected with a heavy phase separator 18, and a residual liquid outlet pipe 19 is arranged at the bottom of the tower kettle 9.

Further, the temperature difference between the tower top 8 and the tower bottom 9 is within 30 ℃.

Further, the chloroacetic acid feed pipe 2 had a chloroacetic acid feed amount of 42 kmol/h.

Further, the reflux ratio of the light phase separator 15 was 0.6.

The working principle is as follows: the method comprises the steps of dividing a partition wall rectifying tower 1 into two parts through an upper sealing plate 11 and a partition plate 12, controlling a vacuum pump 10 to continuously decompress the inside of the partition wall rectifying tower 1, controlling a heating element 4 to heat a tower kettle 9, feeding chloroacetic acid through a chloroacetic acid feeding pipe 2 at a feeding speed of 42kmol/h, feeding methanol through a methanol feeding pipe 3, enabling the chloroacetic acid to flow downwards in a packing layer 7 after being distributed through a liquid distributor 6, enabling the methanol to flow upwards in the packing layer 7 after being distributed through a gas distributor 5, enabling the chloroacetic acid to react with the methanol in the packing layer 7, enabling reactant methyl chloroacetate to pass through a heavy phase connecting pipe 16, condensing the reactant by a heavy phase condenser 17, and collecting the reactant methyl chloroacetate through a heavy phase separator 18.

Having shown and described the basic principles and principal features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being 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, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.

Claims

1. The utility model provides a methyl ester vacuum rectification device is used in chloroacetic acid production, includes dividing wall rectifying column (1), its characterized in that: the top of dividing wall rectifying column (1) is equipped with top of the tower (8), the bottom of dividing wall rectifying column (1) is equipped with tower cauldron (9), there is vacuum pump (10) top of the tower (8) through the pipe connection, the bottom of tower cauldron (9) is equipped with heating element (4), the center is equipped with division board (12) perpendicularly in dividing wall rectifying column (1), the top right side of division board (12) is equipped with last shrouding (11), the left side of division board (12) is equipped with packing layer (7), the top of packing layer (7) is equipped with liquid distributor (6), the bottom of packing layer (7) is equipped with gas distributor (5), down be equipped with chloroacetic acid inlet pipe (2), methyl alcohol inlet pipe (3) on the lateral wall of dividing wall rectifying column (1) from last in proper order, the top of the tower (8) is equipped with light phase connecting pipe (13), the light phase connecting pipe (13) is connected with the light phase condenser (14), the light phase condenser (14) is connected with the light phase separator (15), the light phase separator (15) is communicated with the inside of the partition wall rectifying tower (1) through a return pipe (20), a heavy phase connecting pipe (16) is arranged on the right side of the partition wall rectifying tower (1) and below the upper sealing plate (11), the heavy phase connecting pipe (16) is connected with the heavy phase condenser (17), the heavy phase condenser (17) is connected with the heavy phase separator (18), and a residual liquid outlet pipe (19) is arranged at the bottom of the tower kettle (9).

2. The methyl chloride production methyl ester vacuum rectification device of claim 1, which is characterized in that: the temperature difference between the tower top (8) and the tower kettle (9) is within 30 ℃.

3. The methyl chloride production methyl ester vacuum rectification device of claim 1, which is characterized in that: the chloroacetic acid feeding amount of the chloroacetic acid feeding pipe (2) is 42 kmol/h.

4. The methyl chloride production methyl ester vacuum rectification device of claim 1, which is characterized in that: the reflux ratio of the light phase separator (15) was 0.6.