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Method and device for recycling caprolactam in benzene distillation residual liquid

A technology of caprolactam and residual liquid distillation, which is applied in the field of caprolactam recycling, can solve problems such as loss, and achieve the effects of solving loss, reducing environmental pollution and increasing yield

Active Publication Date: 2015-02-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a novel method and device for recovering caprolactam in the benzene steaming raffinate, which uses a centrifugal extractor to extract and separate the caprolactam in the benzene steaming raffinate in the production of caprolactam, effectively solving the loss of caprolactam in the benzene steaming raffinate , improve the output of caprolactam, reduce environmental pollution, thereby solve the problems existing in the prior art

Method used

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  • Method and device for recycling caprolactam in benzene distillation residual liquid

Examples

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Effect test

Embodiment 1

[0067] In a 200t / year benzene distillation raffinate recovery unit, according to figure 1 In the separation process of the amidation reaction solution shown, the caprolactam in the benzene distillation raffinate is separated and recovered by the method of the present invention, and the purpose of recovering caprolactam in the benzene distillation raffinate is achieved with high efficiency, high precision and low energy consumption. The economic benefit of caprolactam recovery is greatly improved, and the environmental protection problem is solved. Its specific operation process and effect are as follows:

[0068] 1. Material properties

[0069] (1) Benzene raffinate: the material is a mixture of organic phase and inorganic phase, the content of caprolactam is about 40%, and the impurity content is about 20%. The rated flow rate is 2t / h, the temperature is 60-80°C, and the average is about 70°C.

[0070] (2) Washing water: the content of surfactant (mixed fatty acid glycerid...

Embodiment 2

[0078] In a 200t / year benzene distillation raffinate recovery unit, according to figure 1 In the separation process of the amidation reaction solution shown, the method of the present invention is used to separate and recover the caprolactam in the benzene distillation raffinate, so as to achieve the purpose of recovering caprolactam in the benzene distillation raffinate with high efficiency, high precision and low energy consumption, so that The economic benefit of caprolactam recovery is greatly improved, and the environmental protection problem is solved. Its specific operation process and effect are as follows:

[0079] 1. Material properties

[0080] (1) Benzene raffinate: the material is a mixture of organic phase and inorganic phase, the content of caprolactam is about 40%, and the impurity content is about 20%. The rated flow rate is 2t / h, the temperature is 60-80°C, and the average is about 70°C.

[0081] (2) Washing water: the content of surfactant (mixed fatty ac...

Embodiment 3

[0089] In a 200t / year benzene distillation raffinate recovery unit, according to figure 1 In the separation process of the amidation reaction solution shown, the method of the present invention is used to separate and recover the caprolactam in the benzene distillation raffinate, so as to achieve the purpose of recovering caprolactam in the benzene distillation raffinate with high efficiency, high precision and low energy consumption, so that The economic benefit of caprolactam recovery is greatly improved, and the environmental protection problem is solved. Its specific operation process and effect are as follows:

[0090] 1. Material properties

[0091] (1) Benzene raffinate: the material is a mixture of organic phase and inorganic phase, the content of caprolactam is about 40%, and the impurity content is about 20%. The rated flow rate is 2t / h, the temperature is 60-80°C, and the average is about 70°C.

[0092] (2) Washing water: surfactant (mixed fatty acid glyceride) con...

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Abstract

The invention relates to a method and device for recovering caprolactam in benzene distillation residue, and provides a method for recovering caprolactam in the benzene distillation residue. The method comprises the following steps: (a) respectively feeding the benzene distillation residue and water obtained by distilling in a benzene distillation column into a centrifugal extractor; (b) enabling the benzene distillation residue and water to fully mix and be subjected to mass transfer in the centrifugal extractor, in order to extract caprolactam in benzene distillation residue into the water; (c) performing liquid-liquid separation on the mixed solution of the benzene distillation residue and water through the centrifugal extractor in order to separate out an aqueous solution rich in caprolactam and the benzene distillation residue in which the caprolactam is removed; and (d) recycling the aqueous solution rich in caprolactam, separated out in step (c), and treating the benzene distillation residue in which the caprolactam is removed, by incineration. The invention also provides the device for recovering the caprolactam in the benzene distillation residue.

Description

technical field [0001] The present invention relates to a method and a device for recycling caprolactam in the benzene distillation raffinate of a caprolactam production plant, more specifically, the present invention relates to a method for extracting, separating and recovering the benzene distillation raffinate produced in the production process of caprolactam by using a centrifugal extractor Methods and Apparatus. Background technique [0002] Caprolactam (CPL) is an important organic chemical raw material, mainly used as a raw material for the production of polyamide 6 engineering plastics and polyamide 6 fibers. In addition, caprolactam can also be used for the production of antiplatelet drug 6-aminocaproic acid, lauryl azepine Ketones, etc., are widely used. Although the production of caprolactam in my country has increased to a certain extent in recent years, it still cannot meet the needs of the development of the chemical fiber industry and the plastic product indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D223/10C07D201/16B01D11/04
CPCB01D11/048C07D201/16C07D223/10B01D11/04
Inventor 白志山古文全张杰
Owner EAST CHINA UNIV OF SCI & TECH
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