CN217297573U - Methyl ester effluent treatment plant is used in chloroacetic acid production - Google Patents

Abstract

The utility model discloses a methyl ester effluent treatment plant is used in chloroacetic acid production, including distillation column one, reactor, distillation column two, the bottom of distillation column one, reactor, distillation column two all is equipped with heating element and thermocouple, be equipped with mother liquor feed liquor pipe on the lateral wall of distillation column one, the top of distillation column one is equipped with outlet duct one, outlet duct one is connected with circulating water cooler one, the bottom of distillation column one is connected with reactor inside through pump body one, the bottom of reactor is connected with the inside of distillation column two through pump body two, up two distributors are equipped with from down in proper order to the inside of distillation column two, the lower floor distributor and circulating water cooler three-phase connection, upper strata the distributor is connected with circulating water cooler four-phase. This methyl ester effluent treatment plant is used in chloroacetic acid production, the reliability is high, and waste water treatment retrieves effectually.

Description

Methyl ester effluent treatment plant is used in chloroacetic acid production

Technical Field

The utility model belongs to the technical field of chloroacetic acid production facility, especially, relate to a methyl ester effluent treatment plant is used in chloroacetic acid production.

Background

Methyl chloroacetate is a generic name for methyl monochloroacetate, methyl dichloroacetate and methyl trichloroacetate. Methyl monochloroacetate is widely used as a solvent, a medicine, a pesticide and a dye intermediate; methyl dichloroacetate is used as an organic synthesis and dye intermediate; methyl trichloroacetate is used as an organic synthesis intermediate. The preparation method is that the corresponding acid is used as methanol for esterification. 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 by separation. Solves the pollution discharge problem of chloroacetic acid manufacturers and provides a new path for producing methyl chloroacetate. The chloroacetic acid mother liquor contains a large amount of methyl monochloroacetate, methyl dichloroacetate and methyl trichloroacetate. The method converts chloroacetic acid into methyl chloroacetate by a chemical method, has simple operation steps, easily obtained raw materials and reaction conditions, changes waste into valuable, accords with the sustainable development policy, and has higher economic value. Therefore, a matched chloroacetic acid mother liquor wastewater treatment device needs to be designed.

SUMMERY OF THE UTILITY MODEL

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

In order to achieve the above object, the utility model provides a following technical scheme: a methyl ester wastewater treatment device for chloroacetic acid production comprises a first distillation tower, a reactor and a second distillation tower, wherein heating elements and thermocouples are arranged at the bottoms of the first distillation tower, the reactor and the second distillation tower, a mother liquor inlet pipe is arranged on the side wall of the first distillation tower, a first outlet pipe is arranged at the top of the first distillation tower, the first outlet pipe is connected with a first circulating water cooler, the first circulating water cooler is connected with an acetic acid collecting box, the bottom of the first distillation tower is connected with the inside of the reactor through a first pump body, a sodium carbonate inlet pipe is arranged at one side of the reactor, a methanol inlet pipe, a concentrated sulfuric acid inlet pipe and a second outlet pipe are respectively arranged at the top of the reactor, the second outlet pipe is connected with a second circulating water cooler, the second circulating water cooler is connected with the reactor in a backflow manner, a pH meter is arranged inside the reactor, and a layered separation pipe is arranged at the bottom of the reactor, the bottom of reactor is connected with the inside of distillation column two through pump body two, the inside of distillation column two is from up being equipped with two distributors down in proper order, the top of distillation column two is equipped with outlet duct three, outlet duct three is connected with circulating water cooler five, the lower floor the distributor is connected with circulating water cooler three-phase, the upper strata the distributor is connected with circulating water cooler four-phase, the bottom of distillation column two is equipped with the raffinate drain pipe.

Furthermore, the third circulating water cooler is connected with an external methyl acetate collecting box, the fourth circulating water cooler is connected with an external methyl monochloroacetate collecting box, and the fifth circulating water cooler is connected with an external methyl dichloroacetate collecting box.

Compared with the prior art, the beneficial effects of the utility model are that: the components in the chloroacetic acid mother liquor can be separated and recycled, and firstly, acetic acid is separated by vacuum distillation and collected; then, carrying out alcoholization reaction on the distilled liquid to obtain mixed ester; the pH meter is used for detecting and controlling the addition amount of the sodium carbonate aqueous solution, so that the reliability is high; and finally, the methyl chloroacetate with different boiling points is recovered through a distillation tower, so that the device is high in reliability, and the waste liquid treatment and recovery effect is good.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1 distillation tower I, 2 reactors, 3 distillation tower II, 4 mother liquor inlet pipes, 5 vacuum pumps, 6 heating elements, 7 thermocouples, 8 pump bodies I, 9 air outlet pipes I, 10 circulating water cooler I, 11 acetic acid collecting boxes, 12 methanol inlet pipes, 13pH meters, 14 concentrated sulfuric acid inlet pipes, 15 air outlet pipes II, 16 circulating water cooler II, 17 pump bodies II, 18 distributors, 19 circulating water cooler III, 20 circulating water cooler IV, 21 circulating water cooler V, 22 layered separation pipes, 23 air outlet pipes III, 24 raffinate outlet pipes and 25 sodium carbonate inlet pipes.

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 figure 1, the methyl ester wastewater treatment device for chloroacetic acid production comprises a first distillation tower 1, a reactor 2 and a second distillation tower 3, wherein the bottoms of the first distillation tower 1, the reactor 2 and the second distillation tower 3 are respectively provided with a heating element 6 and a thermocouple 7, the side wall of the first distillation tower 1 is provided with a mother liquor inlet pipe 4, the top of the first distillation tower 1 is provided with a first air outlet pipe 9, the first air outlet pipe 9 is connected with a first circulating water cooler 10, the first circulating water cooler 10 is connected with an acetic acid collecting box 11, the bottom of the first distillation tower 1 is connected with the inside of the reactor 2 through a first pump body 8, one side of the reactor 2 is provided with a sodium carbonate inlet pipe 25, the top of the reactor 2 is respectively provided with a methanol inlet pipe 12, a concentrated sulfuric acid inlet pipe 14 and a second air outlet pipe 15, the second air outlet pipe 15 is connected with a second circulating water cooler 16, the second circulating water cooler 16 is connected with the reactor 2 in a backflow manner, the inside of reactor 2 is equipped with pH meter 13, the bottom of reactor 2 is equipped with layering separator tube 22, the bottom of reactor 2 is connected with the inside of distillation column two 3 through pump body two 17, the inside of distillation column two 3 is equipped with two distributors 18 from bottom to top in proper order, the top of distillation column two 3 is equipped with outlet duct three 23, outlet duct three 23 is connected with circulating water cooler five 21, distributor 18 and circulating water cooler three 19 of lower floor are connected, distributor 18 and circulating water cooler four 20 of upper strata are connected, the bottom of distillation column two 3 is equipped with raffinate drain pipe 24.

Furthermore, a third circulating water cooler 19 is connected with an external methyl acetate collecting box, a fourth circulating water cooler 20 is connected with an external methyl monochloroacetate collecting box, and a fifth circulating water cooler 21 is connected with an external methyl dichloroacetate collecting box.

The working principle is as follows: when the device is used, chloroacetic acid mother liquor enters the interior of a distillation tower I1 through a mother liquor inlet pipe 4, a heating element 6 at the bottom of the distillation tower I1 starts to be heated, the temperature of the interior of the distillation tower I1 is measured through a thermocouple 7, the temperature is controlled to be 105 ℃, a vacuum pump 5 is controlled to work to carry out reduced pressure distillation, acetic acid in the mother liquor is quickly volatilized and enters a circulating water cooler I10 through an air outlet pipe I9 to be condensed into liquid, the liquid flows to an acetic acid collecting box 11 to be collected, the evaporated residual mother liquor is pumped into a reactor 2 through a pump body I8, a methanol solution is added into the reactor 2 through a methanol inlet pipe 12, a concentrated sulfuric acid solution is added into the reactor 2 through a concentrated sulfuric acid inlet pipe 14, the heating element 6 is controlled to start to be heated, the temperature of the interior of the reactor 2 is measured through the thermocouple 7, the temperature is controlled to be 110 ℃, and mixed ester is obtained and flows back to the interior of the reactor 2 through a circulating water cooler II 16, after the reaction is finished, the water is separated out through the layered separation pipe 22, at the moment, the sodium carbonate solution is input into the reactor 2 through the sodium carbonate liquid inlet pipe 25, controlling the pH value to be 7-7.5 through a pH meter 13, further pumping the residual mixed ester into the second distillation tower 3 through a second pump body 17, controlling the heating element 6 at the bottom of the second distillation tower 3 to heat, the temperature inside the second distillation column 3 is controlled by the thermocouple 7, so that methyl acetate escapes through the distributor 18 in the lower layer by evaporation, and is connected with a circulating water cooler III 19 for collection, methyl monochloroacetate escapes through a distributor 18 at the upper layer through evaporation, and is connected with a circulating water cooler IV 20 for collection, methyl dichloroacetate escapes through an air outlet pipe III 23 after evaporation, and is connected with a circulating water cooler five 21 for collection, and trichloroacetic acid methyl ester and other high-boiling residues in the distillation residual liquid are discharged through a residual liquid outlet pipe 24.

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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (2)

1. The utility model provides a methyl ester effluent treatment plant is used in chloroacetic acid production, includes distillation column one (1), reactor (2), distillation column two (3), its characterized in that: the bottom of the first distillation tower (1), the bottom of the reactor (2) and the bottom of the second distillation tower (3) are respectively provided with a heating element (6) and a thermocouple (7), the side wall of the first distillation tower (1) is provided with a mother liquor inlet pipe (4), the top of the first distillation tower (1) is provided with a first air outlet pipe (9), the first air outlet pipe (9) is connected with a first circulating water cooler (10), the first circulating water cooler (10) is connected with an acetic acid collecting box (11), the bottom of the first distillation tower (1) is connected with the inside of the reactor (2) through a first pump body (8), one side of the reactor (2) is provided with a sodium carbonate inlet pipe (25), the top of the reactor (2) is respectively provided with a methanol inlet pipe (12), a concentrated sulfuric acid inlet pipe (14) and a second air outlet pipe (15), and the second air outlet pipe (15) is connected with a second circulating water cooler (16), circulating water cooler two (16) and reactor (2) reflux connection, the inside of reactor (2) is equipped with pH meter (13), the bottom of reactor (2) is equipped with layering separator tube (22), the bottom of reactor (2) is connected with the inside of distillation column two (3) through pump body two (17), the inside of distillation column two (3) is from up being equipped with two distributors (18) down in proper order, the top of distillation column two (3) is equipped with outlet duct three (23), outlet duct three (23) are connected with circulating water cooler five (21), the lower floor distributor (18) are connected with circulating water cooler three (19), the upper strata distributor (18) are connected with circulating water cooler four (20), the bottom of distillation column two (3) is equipped with drain pipe (24).

2. The methyl chloride production methyl ester wastewater treatment device according to claim 1, characterized in that: the third circulating water cooler (19) is connected with an external methyl acetate collecting box, the fourth circulating water cooler (20) is connected with an external methyl monochloroacetate collecting box, and the fifth circulating water cooler (21) is connected with an external methyl dichloroacetate collecting box.

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