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Method for recovering caprolactam organic extractant without energy consumption and device thereof

A technology of organic extractant and caprolactam, applied in the field of rectification, can solve the problems of high energy consumption, increased production cost of caprolactam, etc., and achieve the effect of no energy consumption recovery

Pending Publication Date: 2017-12-05
TIANJIN UNIV
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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 for recovering caprolactam organic extractant without energy consumption and device thereof
  • Method for recovering caprolactam organic extractant without energy consumption and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Adopt the first kind of device, the operating method of technological process A is as follows:

[0029] The waste water raw material from the waste water feed tank area A is preheated by the waste water feed preheater 5 and enters the high-pressure waste water stripper 1 for stripping and separation. After condensing excess heat, it is passed into the second high-pressure column reboiler 9, and the condensate is passed into the phase separation tank 12, and the organic phase in the upper part of the phase separation tank 12 is extracted to the waste water organic solvent tank area 1, and the lower water phase is passed through the first pump 15 enters the high-pressure waste water stripping tower 1 after pressurization; One stream passes through the waste water feed preheater 5 to exchange heat with the waste water feed and then discharges to the waste water treatment section G; the organic solvent from the organic solvent feed tank area C passes through the organic sol...

Embodiment 2

[0039] Adopt the second kind of device, the operating method of technological process B is as follows:

[0040] The waste water raw material from the waste water feed tank area A2 is preheated by the waste water feed preheater 25 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 34 (this auxiliary condenser does not work), pass into the second high-pressure column kettle reboiler 29, condensate passes into the phase separation tank 32, the organic phase of the phase separation tank 32 top is extracted to waste water organic solvent tank area 12, the lower water phase After being pressurized by the first pump 35, it enters the high-pressure waste water stripping tower 21; the liquid phase in the bottom of the high-pressure waste water stripping tower 21 is divided into two stocks, and one part returns to the high-press...

Embodiment 3

[0051] Adopt the first kind of device, the operating method of technological process A is as follows:

[0052] The waste water raw material from the waste water feed tank area A is preheated by the waste water feed preheater 5 and enters the high-pressure waste water stripper 1 for stripping and separation. After condensation, the condensate is passed into the phase separation tank 12, and the organic phase in the upper part of the phase separation tank 12 is extracted to the waste water organic solvent tank area 1, and the lower water phase enters the high-pressure waste water stripper 1 after being pressurized by the first pump 15; The liquid phase in the tank of the stripper 1 is divided into two streams, one stream is evaporated through the first high-pressure tower tank reboiler 8 and then returned to the high-pressure waste water stripper 1, and the other stream passes through the waste water feed preheater 5 and the waste water feed After heat exchange, it is discharged...

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Abstract

The invention discloses a method for recovering a caprolactam organic extractant without energy consumption and a device thereof. The device comprises a high-pressure wastewater stripper, high, medium and low pressure organic solvent rectifying towers, wastewater feed preheater, an organic solvent feed preheater, a low-pressure tower top condenser, a reboiler, a phase-splitting tank, an organic solvent discharging cooler, a high-pressure tower top auxiliary condenser, a pump and the like. Three-effect rectification is adopted for recovery of an organic extractant. With matching between condensation load on tower top of the high-pressure organic solvent rectifying tower and heat load of the reboiler at the tower bottom of the medium-pressure organic solvent rectifying tower, and with matching between condensation load on tower top of the medium-pressure organic solvent rectifying tower and heat load of the reboiler at the tower bottom of the low-pressure organic solvent rectifying tower, thermally coupled rectification is realized. Meanwhile, steam on tower top of the high-pressure wastewater stripper is used for heating the reboiler at the tower bottom of the high-pressure organic solvent rectifying tower, so as to realize recovery of the caprolactam organic extractant without energy consumption; and production cost of caprolactam is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of rectification, in particular to a method and a device for recovering caprolactam organic extractant without 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 circulation. And the wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D223/10C07D201/16
CPCC07D201/16C07D223/10
Inventor 李文鹏张敏卿张金利
Owner TIANJIN UNIV
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