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A kind of caprolactam aqueous solution concentration reuse device and process

A caprolactam, aqueous solution technology, applied in evaporator regulation/control, steam pressurized evaporation, multi-effect evaporation, etc., can solve the problems of low enthalpy value, high energy consumption, high cost, and achieve low operating cost, high thermal efficiency, The effect of low unit energy consumption

Active Publication Date: 2018-04-06
CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the extraction water with a caprolactam and oligomer content of about 10% is evaporated in three effects by a centrifugal pump, the extraction water solution is finally concentrated to about 70%, and the secondary steam generated by the last effect evaporation is usually passed through cooling water due to its low heat enthalpy. Discharged after cooling, high energy consumption and high cost

Method used

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  • A kind of caprolactam aqueous solution concentration reuse device and process

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: A device for concentration and reuse of aqueous caprolactam solution, including feed pump 1, raw material preheater 2, one-effect concentration system, two-effect concentration system, three-effect concentration system, four-effect concentration system and compression system; The first-effect concentration system includes a first-effect falling film evaporator 11, a first-effect feed / circulation pump 12, and a first-effect gas-liquid separator 13; the second-effect concentration system includes a second-effect falling film evaporator 21, a second-effect The feed / circulation pump 22 and the two-effect gas-liquid separator 23; the three-effect concentration system includes a three-effect falling film evaporator 31, a three-effect feed pump 32, and a three-effect circulating pump 33; the four-effect concentration system includes Four-effect forced circulation heater 41, four-effect forced circulation separator 42, four-effect feed pump 43, and product delivery pum...

Embodiment 2

[0036] Example 2: The device in this example is the same as that in Example 1. The specific process of concentration and reuse of the caprolactam aqueous solution includes the following steps:

[0037] (1) Before system operation, first adopt 0.5MPa fresh steam to establish the steam balance of the whole system, and continuously input it in the whole treatment process;

[0038] (2) The aqueous solution containing 10wt% caprolactam from the nylon 6 slicing device is passed into the raw material preheater at a flow rate of 10000kg / h, the preheating temperature is 82°C, and the raw material is passed into the one-effect falling film evaporator when the temperature is reached , The first-effect falling film evaporator is heated to 125°C, the boiling point of the material is 120°C, and the caprolactam concentration in the first-effect concentrated solution is 25wt%; the first-effect concentrated solution is input by the pump to the second-effect falling film evaporation Inside the evapo...

Embodiment 3

[0039] Example 3: The device in this example is the same as that in Example 1. The specific process of concentration and reuse of the caprolactam aqueous solution includes the following steps:

[0040] (1) Before the system runs, 1MPa fresh steam is used to establish the steam balance of the entire system, and it is continuously input in the entire treatment process;

[0041] (2) The aqueous solution containing 10wt% caprolactam from the nylon 6 slicing device is passed into the raw material preheater at a flow rate of 30000kg / h, and the preheating temperature is 90℃. After the temperature is reached, the raw material is passed into the one-effect falling film evaporator , The first-effect falling film evaporator is heated to 132°C, the boiling point of the material is 123°C, and the caprolactam concentration in the first-effect concentrated solution is 30wt%; the first-effect concentrated solution is input by the pump to the second-effect falling film evaporation Inside the vessel...

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Abstract

The invention discloses an aqueous caprolactam solution concentration and reuse apparatus. The apparatus comprises a feeding pump, a raw material preheater, a first-effect evaporator, a second-effect evaporator, a third-effect evaporator, a fourth-effect concentration system and a compression system. A "three-effect falling film evaporation + fourth forced circulation evaporation + mechanical vapor recompression" concentration technology is adopted to concentrate an aqueous caprolactam solution with the content of about 10 wt% to make the content reach 85 wt% or above, so the concentration recovery rate is improved; and the apparatus and the technology have the advantages of high energy utilization rate, low running cost, low heating temperature difference, environmental protection, convenience in operation, and good market prospect.

Description

Technical field [0001] The invention belongs to the technical field of industrial water treatment, relates to a waste water treatment process in the nylon 6 production process, and specifically relates to a device and a treatment process for concentrating and recycling a low-concentration aqueous solution containing caprolactam. Background technique [0002] The polymerization reaction of nylon 6 is a balanced reaction. Therefore, about 10% of monomer caprolactam and cyclic polymers will be produced in the production of nylon 6 chips. In particular, cyclic dimers will cause serious harm to the polymerization process, which is required in actual production. Use pure water and nylon 6 chips to extract countercurrently in the extraction tower. The unreacted caprolactam and its oligomers in the chips enter the pure water. After the chips are extracted, they are dried and cooled into finished products. The extracted water contains about 10% of caprolactam and oligomers. . This part o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D1/26B01D1/28B01D1/22
CPCB01D1/0082B01D1/22B01D1/26B01D1/2884
Inventor 岳昌海黄卉杨万典黄益平秦凤祥石磊
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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