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Energy-saving method and apparatus of caprolactam system

A caprolactam and energy-saving device technology, applied in the field of rectification, can solve the problems of high energy consumption and increased production cost of caprolactam, achieve low tower bottom temperature, prevent product decomposition and side reactions

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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  • Energy-saving method and apparatus of caprolactam system
  • Energy-saving method and apparatus of caprolactam system
  • Energy-saving method and apparatus of caprolactam system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The operation method of the first device is as follows:

[0034] The waste water raw material from the waste water feed tank area A enters the high-pressure benzene distillation tower 1 for stripping and separation, and the top steam of the high-pressure benzene distillation tower is condensed by the first low-pressure tower kettle reboiler 5 and then extracted to the refined benzene organic solvent tank area E; The liquid phase of the high-pressure benzene distillation tower 1 tower kettle is divided into two stocks, one is returned to the high-pressure benzene distillation tower 1 after being evaporated by the high-pressure tower kettle reboiler 4, and the other is discharged to the crude benzene heavy component separation section C; from the organic The organic solvent in the solvent feed tank area G enters the low-pressure organic solvent rectification tower 2 for rectification, and the tower overhead steam of the low-pressure organic solvent rectification tower 2 is...

Embodiment 2

[0045] The operation method of the second device is as follows:

[0046] The waste water raw material from the waste water feed tank area A2 enters the high-pressure benzene distillation tower 21 for stripping and separation, and the steam at the top of the high-pressure benzene distillation tower passes through the auxiliary condenser 30 at the top of the high-pressure tower (the condenser is not working), and then passes into the medium-pressure tower Kettle reboiler 26, after condensation, it is extracted to refined benzene organic solvent tank area E2; the liquid phase of the high-pressure benzene distillation tower 21 is divided into two stocks, and one is returned to the high-pressure benzene distillation tower after being evaporated by the high-pressure tower still reboiler 25 21, the other is discharged to the crude benzene heavy component separation section C2; the organic solvent from the organic solvent feed tank area F2 enters the low-pressure organic solvent rectif...

Embodiment 3

[0058] Another method of operation using the second device is as follows:

[0059] The waste water raw material from the waste water feed tank area A2 enters the high-pressure benzene distillation tower 21 for stripping and separation, and the steam at the top of the high-pressure benzene distillation tower is condensed by the auxiliary condenser 30 at the top of the high-pressure tower, and then extracted to the organic solvent tank area of ​​pure benzylbenzene E2; the liquid phase of the high-pressure benzene distillation tower 21 tower kettle is divided into two stocks, one is returned to the high-pressure benzene distillation tower 21 after being evaporated by the high-pressure tower kettle reboiler 25, and the other is discharged to the crude benzene heavy component separation section C2; from organic The organic solvent in the solvent feed tank area F2 enters the low-pressure tower still reboiler 27 for rectification, and the tower top vapor of the low-pressure organic so...

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Abstract

The invention discloses an energy-saving method and apparatus of a caprolactam system. The apparatus comprises a high-pressure benzene distillation column, a medium-pressure organic solvent rectifying tower, a low-pressure organic solvent rectifying tower, 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 high-pressure tower top auxiliary condenser, and a pump. The organic 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 benzene distillation column is used for heating a column bottom reboiler of the medium-pressure organic solvent rectifying tower, so that energy saving and optimization of the caprolactam system are achieved. 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 an energy-saving method and device for a caprolactam system. Background technique [0002] At present, domestic caprolactam plants generally adopt the ammonia oximation process, which is a new process for the production of cyclohexanone oxime developed in recent years. It uses hydrogen peroxide, liquid ammonia, and cyclohexanone as raw materials, and the reaction is direct in one step. Generate cyclohexanone oxime, and produce caprolactam under the action of oleum. The modified process has the advantages of short production process, simple control, general equipment and pipeline material requirements, and less discharge of three wastes. For a 100,000-ton / year caprolactam large-scale chemical production plant using benzene as a raw material, the main devices generally included are cyclohexanone, cyclohexanone oximation, caprolactam refining, ammonium sulfate pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D223/10
CPCC07D223/10Y02P20/10
Inventor 李文鹏张敏卿张金利
Owner TIANJIN UNIV
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