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Recovery system and recovery method for gas-phase benzene in caprolactam

A caprolactam and recovery system technology, applied in the field of benzene recovery, can solve the problems of increasing benzene consumption and environmental pollution

Pending Publication Date: 2021-07-06
文长明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the usual water extraction process, there will be some benzene overflow (about 5% benzene content), which increases the consumption of benzene in the production system, and also causes environmental pollution

Method used

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  • Recovery system and recovery method for gas-phase benzene in caprolactam

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Experimental program
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Embodiment 1

[0029] Please refer to figure 1 , figure 1 Shown is the cross-sectional structure diagram of the system in the embodiment of the present invention.

[0030] This embodiment provides a recovery system for benzene in caprolactam, which includes an extraction device and a vaporization condensation separator 2, and the extraction device and the vaporization condensation separator 2 are in fluid communication. The recovery system of benzene in caprolactam also includes a benzene pump tank 10, which is in fluid communication with the vaporization condensation separator 2, and a first valve 6 is arranged between the gasification condensation separator 2 and the benzene pump tank 10. In this embodiment, the gaseous benzene in the caprolactam benzene solution after extraction is condensed and liquefied by setting the vaporization condensation separator 2 and the extraction device. In this embodiment, the extraction device is a water extraction tower 1, wherein the water extraction tow...

Embodiment 2

[0035] Please refer to figure 1 , figure 1 Shown is the cross-sectional structure diagram of the system in the embodiment of the present invention. This embodiment provides a recovery method based on the gas-phase benzene recovery system in caprolactam, comprising the following steps: passing the mixed solution of caprolactam and benzene into the water extraction tower 1, keeping the internal temperature of the water extraction tower 1 at 40°C, and The air pressure is 0 MPa, and extracted with water to obtain an aqueous solution of benzene and caprolactam. The gas released from the top of the water extraction tower 1 enters the vaporization condensation separator 2 and passes into the liquid nitrogen in the liquid nitrogen tank 4 for heat exchange and condensation, and the discharged non-condensable gas In the tail gas removal treatment device 5, when the reading of the temperature controller 7 is 7°C, the opening of the second valve 6 remains unchanged to maintain the stable...

Embodiment 3

[0037] Please refer to figure 1 , figure 1 Shown is the cross-sectional structure diagram of the system in the embodiment of the present invention. This embodiment provides a recovery method based on the gas-phase benzene recovery system in caprolactam, comprising the following steps: passing the mixed solution of caprolactam and benzene into the water extraction tower 1, keeping the internal temperature of the water extraction tower 1 at 45°C, and The air pressure is 0.01MPa, extracted with water to obtain an aqueous solution of benzene and caprolactam, the gas released from the top of the water extraction tower 1 enters the vaporization condensation separator 2 and passes into the liquid nitrogen in the liquid nitrogen tank 4 for heat exchange and condensation, and the discharged non-condensable In the gas de-tail gas treatment device 5, when the reading of the temperature controller 7 is 10°C, the opening of the second valve 6 remains unchanged to maintain the stable deliv...

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Abstract

The invention provides a recovery system and a recovery method for gas-phase benzene in caprolactam, and relates to the technical field of benzene recovery. The recovery system comprises an extraction device and a gasification and condensation separator, and the extraction device is in fluid communication with the gasification and condensation separator. Recovered liquid benzene is reused, so that the consumption of benzene in the production system is reduced, the environmental pollution caused by volatilized benzene is avoided, in addition, the whole system is simple in constituent parts and easy to operate, automatic control can be realized, and the operation difficulty of technicians is greatly reduced. The invention further provides the recovery method based on the recovery system for gas-phase benzene in caprolactam. According to the recovery method, the gaseous benzene can be quickly condensed into liquid benzene, the chemical property of the liquid nitrogen is stable, the liquid nitrogen cannot react with the gaseous benzene and other gases at normal temperature and normal pressure, it can be guaranteed that the recycled benzene can be directly utilized, subsequent operation steps such as benzene purification are reduced, and the whole recycling method is convenient to implement.

Description

technical field [0001] The invention relates to the technical field of benzene recovery, in particular to a recovery system and method for gas-phase benzene in caprolactam. Background technique [0002] Caprolactam is an important industrial organic raw material, which is mainly used in the production of polycaprolactam fibers, polyamide engineering plastics and films. Using benzene as raw material, the production of caprolactam by ammonia oximation (HAO) and Beckmann rearrangement has become the mainstream of caprolactam production industry. Liquid caprolactam is usually produced from cyclohexanone oxime through rearrangement, neutralization reaction, extraction, ion exchange, hydrogenation, evaporation, distillation and other processes. [0003] The extraction process includes benzene extraction and water extraction, and the benzene-soluble impurities and water-soluble impurities in the material are removed through two extractions to prepare an aqueous solution containing...

Claims

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Application Information

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IPC IPC(8): B01D11/04B01D5/00B01D53/00C07C15/04C07C7/00C07C7/10
CPCB01D11/0488B01D11/0492B01D5/0003B01D5/0057B01D5/009B01D53/002C07C7/005C07C7/00C07C7/10C07C15/04
Inventor 文长明李建州任成韵于进玉于吉高
Owner 文长明
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