Method and apparatus for recycling caprolactam organic extraction agent with ultra low energy consumption

A caprolactam and organic solvent technology, applied in the field of rectification, can solve the problems of high energy consumption and increased production cost of caprolactam, and achieve the effect of ultra-low energy recovery

Active Publication Date: 2017-12-05
TIANJIN TIANDI CHUANGZHI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, all organic extraction agents are regenerated by distillation, and the organic extraction agent is steamed from the top of the tower for purification. Most of the domestic use of single-column distillation, high energy consumption, resulting in an increase in the production cost of caprolactam

Method used

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  • Method and apparatus for recycling caprolactam organic extraction agent with ultra low energy consumption
  • Method and apparatus for recycling caprolactam organic extraction agent with ultra low energy consumption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Adopt the first kind of device, the operating method of technological process A is as follows:

[0034] The waste water raw material from the waste water feed tank area A is preheated by the waste water feed preheater 4 and enters the high-pressure waste water stripper 1 for stripping and separation, and the steam at the top of the high-pressure waste water stripper passes through the high-pressure tower top auxiliary condenser 12 (this condenser does not work), pass into medium-pressure tower kettle reboiler 8, pass into phase-separation tank 10 after condensation, phase-separation tank 10 top organic phases are extracted to waste water organic solvent tank area 1, and lower water phase passes through the second A pump 14 pressurizes and enters the high-pressure waste water stripper 1; the liquid phase of the high-pressure waste water stripper 1 tower tank is divided into two stocks, one is returned to the high-pressure waste water stripper 1 after being evaporated by t...

Embodiment 2

[0044] Adopt the second kind of device, the operating method of technological process B is as follows:

[0045]The waste water raw material from the waste water feed tank area A2 is preheated by the waste water feed preheater 24 and enters the high-pressure waste water stripper 21 for stripping and separation, and the steam at the top of the high-pressure waste water stripper passes through the high-pressure tower top auxiliary condenser 32 (this condenser does not work), pass into medium-pressure tower kettle reboiler 28, pass into phase-separation tank 30 after condensation, phase-separation tank 30 top organic phases are extracted to waste water organic solvent tank area 12, and lower water phase passes through The first pump 34 pressurizes and enters the high-pressure waste water stripper 21; the liquid phase of the high-pressure waste water stripper 21 tower kettle is divided into two stocks, and one part returns to the high-pressure waste water stripper 21 after being eva...

Embodiment 3

[0055] Adopt the first kind of device, the operating method of technological process A (why is two A) is as follows:

[0056] The waste water raw material from the waste water feed tank area A is preheated by the waste water feed preheater 4 and enters the high-pressure waste water stripper 1 for stripping and separation, and the steam at the top of the high-pressure waste water stripper passes through the high-pressure tower top auxiliary condenser 12 , feed into the phase-separation tank 10 after condensation, the organic phase of the phase-separation tank 10 top is extracted to the wastewater organic solvent tank area 1, and the lower water phase enters the high-pressure wastewater stripping tower 1 after being pressurized by the first pump 14; the high-pressure wastewater stripping The liquid phase in the tower kettle of tower 1 is divided into two streams, one is evaporated by the high-pressure tower kettle reboiler 7 and then returned to the high-pressure waste water stri...

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Abstract

The invention discloses a method and apparatus for recycling a caprolactam organic extraction agent with ultra low energy consumption. The apparatus includes a high-pressure wastewater stripper, a medium-pressure organic solvent rectifying tower, a low-pressure organic solvent rectifying tower, a wastewater feed preheater, an organic solvent feed preheater, a low-pressure tower top condenser, a high-pressure column bottom reboiler, a medium-pressure column bottom reboiler, a low-pressure column bottom reboiler, a phase-splitting pot, an organic solvent discharging cooler, a high-pressure tower top auxiliary condenser, and a pump. The organic extraction agent is recycled through double-effect rectification, and the tower top condensation load of the medium-pressure organic solvent rectifying tower cooperates with the thermic load of a column bottom reboiler of the low-pressure organic solvent rectifying tower, so that the thermal coupling rectification is achieved. Tower top steam of the high-pressure wastewater stripper is used for heating a column bottom reboiler of the medium-pressure organic solvent rectifying tower, so that the caprolactam organic extraction agent can be recycled with ultra low energy consumption. The production cost of caprolactam is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of rectification, and in particular relates to a method and a device for recovering a caprolactam organic extractant with ultra-low energy consumption. Background technique [0002] In the caprolactam plant, in the preparation section of cyclohexanone oxime, the reaction solution is recovered by solvent, extracted, and washed to recover the reaction solvent. The aqueous solution of cyclohexanone oxime is extracted and washed, and the wastewater generated after extraction and washing enters the waste water stripping tower, and the stripping tower After the waste water that meets the requirements is obtained in the kettle, it is sent to the waste water treatment station, and the top discharge is separated into an organic phase after phase separation, and the water phase is refluxed to the feed to continue distillation. The waste water stripper has high energy consumption due to the large amount of water and cir...

Claims

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Application Information

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IPC IPC(8): C07C7/04C07C7/06C07C7/10C07C15/04C07D223/10
CPCC07C7/04C07C7/06C07C7/10C07D223/10C07C15/04Y02P20/30Y02P20/50Y02P20/10
Inventor 张敏卿张金利李文鹏
Owner TIANJIN TIANDI CHUANGZHI TECH DEV
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