A methyl methacrylate recovery waste treatment system

Abstract

The utility model relates to the technical field of chemical production, and discloses a methyl methacrylate recovery waste treatment system, comprising an esterification unit, a refining unit and a heavy component recovery unit, wherein the esterification unit is used to perform an esterification reaction between raw materials and methanol to generate methyl methacrylate, the refining unit is used to perform fine processing on the methyl methacrylate generated by the esterification unit, and the heavy component recovery unit is used to collect and recover the heavy components generated by the separation and processing of the esterification unit, and transport the collected heavy components to the esterification unit for re-esterification reaction. The utility model has the beneficial effects of high material utilization and less hazardous waste.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to a methyl methacrylate recovery waste material processing system. Background Art

[0002] Methyl methacrylate (MMA) is an important organic chemical raw material and a homopolymer or copolymer monomer, which is widely used in household appliances, automobiles, construction, sanitary ware, instruments and meters, advertising and decoration and other industries. In the production of MMA, acetone cyanohydrin and 100% (wt) sulfuric acid are usually used as raw materials, and α-formamidoisopropyl hydrogen sulfate is generated through acylation reaction, and methacrylamide sulfate (MAAS) is obtained through transposition rearrangement reaction, which is esterified with methanol to generate methyl methacrylate (MMA), and then the qualified product MMA is produced through light removal and distillation in the refining unit.

[0003] When the refining unit is performing distillation processing, it mainly removes the heavy components in methyl methacrylate (MMA) generated by esterification reaction with methanol to improve the purity and quality of the produced MMA product. In the existing production process, when producing MMA, the heavy components produced by the refining unit are usually concentrated by a concentration device and the MMA component is extracted. However, during the concentration and extraction, only about 80% of the MMA in the heavy components can be extracted, and the remaining part after extraction can only be disposed of as hazardous waste, resulting in waste of produced components and materials, and increasing the amount of hazardous waste generated during the production process. Utility Model Content

[0004] The utility model aims to provide a methyl methacrylate recovery waste material processing system to solve the technical problems of low extraction rate of heavy components and high generation of hazardous waste in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a methyl methacrylate recovery waste treatment system, comprising an esterification unit, a refining unit and a heavy component recovery unit, the esterification unit is used to esterify raw materials with methanol to generate methyl methacrylate, the refining unit is used to perform fine processing on the methyl methacrylate generated by the esterification unit, and the heavy component recovery unit is used to collect and recover the heavy components generated by the separation and processing of the esterification unit, and transport the collected heavy components to the esterification unit for re-esterification reaction.

[0006] The principle and advantage of this scheme are as follows: when methyl methacrylate is produced, the raw materials are processed according to the processing steps, wherein after the raw materials are subjected to esterification reaction in the esterification unit to generate methyl methacrylate, the methyl methacrylate is transported to the refining unit for light removal and distillation processing in sequence; wherein during the distillation processing, the remaining heavy components in the distillation tower are recovered by the heavy component recovery unit, and the heavy component recovery unit transports the recovered heavy components to the esterification unit again for esterification reaction, so that the methacrylic acid in the heavy components can continue to undergo esterification reaction to generate methyl methacrylate.

[0007] Compared with the prior art, in the present invention, when treating the heavy components in the production process of methyl methacrylate, the heavy components are collected by the heavy component recovery unit and re-transported to the esterification unit for re-reaction, thereby ensuring that the effective ingredients in the heavy components can be fully utilized, avoiding the loss and waste of materials, and reducing the amount of hazardous waste materials generated in the production process; and when treating the heavy components, the concentration treatment device for treating the heavy components in the production process can be reduced, the concentration treatment steps for the heavy components in the production process of methyl methacrylate are reduced, and the energy consumption and production cost of methyl methacrylate production are reduced.

[0008] Preferably, as an improvement, the refining unit comprises a light-removing tower and a distillation tower, the input port of the light-removing tower is used to input the methyl methacrylate after the esterification reaction of the esterification unit, the output port of the light-removing tower is connected to the input port of the distillation tower, and the refining unit is used to sequentially perform light-removing and distillation processing on the methyl methacrylate generated by the esterification unit.

[0009] Preferably, as an improvement, an esterification separation unit is provided between the esterification unit and the refining unit, the feed port of the esterification separation unit is connected to the output port of the esterification unit, the output port of the esterification separation unit is connected to the input port of the light removal tower, and the esterification separation unit is also provided with a waste port, the waste port is connected to the waste treatment unit through a pipeline, and the waste port is used to transport the waste generated after separation to the waste treatment unit for treatment. After the esterification reaction, the esterification separation unit can separate the waste acid water after esterification from the heavy components that cannot undergo esterification reaction, ensure that the impurities in the processing of methyl methacrylate can be discharged in time, avoid recycling the heavy components of repeated reactions and circulate them into the refining unit for multiple times, and affect the processing effect of methyl methacrylate.

[0010] Preferably, as an improvement, the heavy component recovery unit includes a heavy component collection part, the heavy component collection part is used to continuously collect the heavy components of the refining unit, the heavy component collection part includes a heavy component collection pool, the heavy component collection pool is connected to the refining unit through a pipeline, and the heavy component collection pool is used to temporarily store the heavy components generated by the refining unit. The heavy components generated by the distillation tower during the distillation process can be collected and recovered in time, ensuring that the heavy components can be collected and recovered in time, and improving the efficiency of heavy component recovery and utilization.

[0011] Preferably, as an improvement, the extraction ratio of the heavy component collection part to the refining unit heavy components is 15%-25%. By increasing the extraction ratio of the heavy components, the materials that are difficult to be distilled in the distillation tower can be collected in time and subjected to secondary processing, ensuring that the effective components in the materials are fully reacted, improving the output efficiency of methyl methacrylate, and reducing the content of the heavy components that are difficult to be distilled in the distillation tower, thereby reducing the pressure of the distillation process.

[0012] Preferably, as an improvement, the heavy component recovery unit further comprises a heavy component recovery pipe, one end of the heavy component recovery pipe is connected to the heavy component recovery tank via a delivery pump, and the other end is connected to the input port of the esterification unit, and the heavy component recovery pipe is used to transport the heavy components collected by the heavy component recovery unit to the esterification unit for another esterification reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a methyl methacrylate waste recovery and treatment system in an embodiment of the utility model. DETAILED DESCRIPTION

[0014] The following is further described in detail through specific implementation methods:

[0015] The reference numerals in the drawings of the specification include: esterification unit 1, refining unit 2, lightness removal tower 201, distillation tower 202, heavy component recovery unit 3, heavy component collection section 301, heavy component recovery pipe 302, esterification separation unit 4, and waste treatment unit 5.

[0016] As attached Figure 1 As shown, a methyl methacrylate recovery waste treatment system includes an esterification unit 1, a refining unit 2 and a heavy component recovery unit 3, wherein the esterification unit 1 is used to esterify the raw material with methanol to generate methyl methacrylate, the refining unit 2 is used to separate the heavy components in the methyl methacrylate generated by the esterification unit 1, and the heavy component recovery unit 3 is used to collect the heavy components separated by the esterification unit 1 for recycling.

[0017] The input port of the esterification unit 1 is connected to the device before the esterification of methyl methacrylate, and the output port of the esterification unit 1 is used to output the methyl methacrylate after the esterification reaction; the refining unit 2 includes a light removal tower 201 and a distillation tower 202, the input port of the light removal tower 201 is used to input the methyl methacrylate after the esterification reaction, and the output port of the light removal tower 201 is connected to the input port of the distillation tower 202, and the refining unit 2 is used to sequentially remove light and distill the methyl methacrylate generated by the esterification unit 1. The specific structures of the esterification unit 1, the light removal tower 201 and the distillation tower 202 are all prior art and will not be repeated here.

[0018] The heavy component recovery unit 3 includes a heavy component collection part 301, which is used to continuously collect the heavy components in the distillation tower 202. Specifically, the heavy component collection part 301 includes a heavy component collection pool, which is connected to the heavy component output port of the distillation tower 202 through a pipeline, and the heavy component collection pool is used to temporarily store the heavy components generated by the distillation tower 202. The heavy components generated by the distillation tower 202 during the distillation process can be collected and recovered in time, ensuring that the heavy components can be collected and recovered in time, and improving the efficiency of heavy component recovery. The extraction ratio of the heavy component collection unit 301 when collecting the heavy components of the distillation tower 202 is 15%-25%. Preferably, in the present embodiment, the extraction ratio of the heavy component collection unit 301 to the heavy components of the distillation tower 202 is 20%. By increasing the extraction ratio of the heavy components, the materials that are difficult to be distilled in the distillation tower 202 can be collected in time and subjected to secondary processing, thereby ensuring that the effective ingredients in the materials are fully reacted, improving the output efficiency of methyl methacrylate, reducing the content of the heavy components that are difficult to be distilled in the distillation tower 202, and reducing the pressure of the distillation process.

[0019] The heavy component recovery unit 3 also includes a heavy component recovery pipe 302, one end of which is connected to the heavy component recovery pool through a delivery pump, and the other end is connected to the input port of the esterification unit 1; the heavy component recovery pipe 302 is used to extract the heavy components collected in the heavy component recovery pool to the esterification unit 1 for esterification reaction.

[0020] An esterification separation unit 4 is also provided between the esterification unit 1 and the refining unit 2. The preferred esterification separation unit 4 is an esterification separation tower, wherein the feed port of the esterification separation tower is connected to the output port of the esterification unit 1, and the output port of the esterification separation tower is connected to the input port of the light removal tower 201 in the refining unit 2, and the output port of the esterification separation tower is used to transport the separated material to the refining unit 2 for treatment. A waste port is also provided on the esterification separation tower, and the waste port is connected to the waste treatment unit 5 through a pipeline, and the waste port is used to transport the waste generated after separation to the waste treatment unit 5 for treatment. The specific structure of the esterification separation unit 4 is prior art and will not be repeated here. After the esterification reaction, the esterification separation unit 4 can separate the waste acid water after esterification from the heavy components that cannot be esterified, so as to ensure that the impurities in the processing of methyl methacrylate can be discharged in time, and avoid the heavy components of the repeated reactions from being recycled and repeatedly circulated into the refining unit 2, which affects the processing effect of methyl methacrylate.

[0021] The specific implementation process is as follows:

[0022] When methyl methacrylate is produced, the raw materials are processed according to the processing steps, wherein after the esterification unit 1 performs an esterification reaction on the raw materials to generate methyl methacrylate, the esterification separation unit 4 separates the methyl methacrylate generated by the reaction of the esterification unit 1, and the separated methyl methacrylate is transported to the refining unit 2 for sequential light removal and distillation processing; wherein during the distillation process, the remaining heavy components in the distillation tower 202 are recovered by the heavy component recovery unit 3, and the heavy component recovery unit 3 transports the recovered heavy components to the esterification unit 1 again for esterification reaction, so that the methacrylic acid in the heavy components can continue to undergo esterification reaction to generate methyl methacrylate, and the remaining substances in the heavy components are separated by the esterification separation unit 4 and enter the waste treatment unit 5 together with the waste for treatment.

[0023] Compared with the prior art, in the present solution, when the heavy components in the production process of methyl methacrylate are processed, the heavy components are collected by the heavy component recovery unit 3 and re-transported to the esterification unit 1 for re-reaction, so as to ensure that the effective components in the heavy components can be fully utilized, avoid the loss and waste of materials, and reduce the amount of hazardous waste materials generated in the production process; and when the heavy components are processed, the concentration treatment device for the heavy components in the production process can be reduced, the concentration treatment steps for the heavy components in the production process of methyl methacrylate are reduced, and the energy consumption and production cost of methyl methacrylate production are reduced.

[0024] The above are only embodiments of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A methyl methacrylate waste recovery treatment system, characterized in that: The invention comprises an esterification unit, a refining unit and a heavy component recovery unit. The esterification unit is used for esterifying raw materials with methanol to generate methyl methacrylate. The refining unit is used for fine processing of the methyl methacrylate generated by the esterification unit. The heavy component recovery unit is used for collecting and recovering the heavy components generated by the separation and processing of the esterification unit, and transporting the collected heavy components to the esterification unit for another esterification reaction.

2. A methyl methacrylate waste recovery treatment system according to claim 1, characterized in that: The refining unit includes a light removal tower and a distillation tower. The input port of the light removal tower is used to input the methyl methacrylate after the esterification reaction of the esterification unit. The output port of the light removal tower is connected to the input port of the distillation tower. The refining unit is used to sequentially perform light removal and distillation processing on the methyl methacrylate generated by the esterification unit.

3. A methyl methacrylate recovery waste treatment system according to claim 2, characterized in that: An esterification separation unit is provided between the esterification unit and the refining unit, the feed port of the esterification separation unit is connected to the output port of the esterification unit, the output port of the esterification separation unit is connected to the input port of the light removal tower, the esterification separation unit is also provided with a waste port, the waste port is connected to the waste treatment unit through a pipeline, and the waste port is used to transport the waste generated after separation to the waste treatment unit for treatment.

4. A methyl methacrylate waste recovery treatment system according to claim 1, characterized in that: The heavy component recovery unit includes a heavy component collection part, which is used to continuously collect the heavy components of the refining unit. The heavy component collection part includes a heavy component collection pool, which is connected to the refining unit through a pipeline, and the heavy component collection pool is used to temporarily store the heavy components generated by the refining unit.

5. A methyl methacrylate waste recovery treatment system according to claim 4, characterized in that: The extraction ratio of the heavy component collection part to the heavy component of the refining unit is 15%-25%.

6. A methyl methacrylate recovery waste treatment system according to claim 4, characterized in that: The heavy component recovery unit also includes a heavy component recovery pipe, one end of which is connected to the heavy component recovery tank through a delivery pump, and the other end is connected to the input port of the esterification unit. The heavy component recovery pipe is used to transport the heavy components collected by the heavy component recovery unit to the esterification unit for another esterification reaction.

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