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Aqueous caprolactam solution concentration and reuse apparatus and technology thereof

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: 2016-10-26
CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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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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  • Aqueous caprolactam solution concentration and reuse apparatus and technology thereof

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Embodiment 1

[0027]Embodiment 1: A concentrated recycling device for caprolactam aqueous solution, comprising a feed pump 1, a raw material preheater 2, a first-effect concentration system, a second-effect concentration system, a three-effect concentration system, a four-effect concentration system and a compression system; Described one-effect concentration system comprises one-effect falling film evaporator 11, one-effect feed / circulation pump 12 and one-effect gas-liquid separator 13; Described two-effect concentration system comprises two-effect falling-film evaporator 21, two-effect Feed / circulation pump 22 and two-effect gas-liquid separator 23; Described three-effect concentration system comprises three-effect falling film evaporator 31, three-effect feed pump 32 and three-effect circulation pump 33; Described four-effect concentration system comprises Four-effect forced circulation heater 41, four-effect forced circulation separator 42, four-effect feed pump 43 and product delivery ...

Embodiment 2

[0036] Embodiment 2: The device in the present embodiment is the same as in Embodiment 1, and the specific process for concentrating and recycling the caprolactam aqueous solution includes the following steps:

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

[0038] (2) Pass the aqueous solution containing 10wt% caprolactam from the nylon 6 slicing device into the raw material preheater at a flow rate of 10000kg / h for preheating, the preheating temperature is 82°C, and the raw material is passed into the first-effect falling film evaporator after the temperature reaches , heated to 125°C in the first-effect falling film evaporator, at this time the boiling point of the material is 120°C, and the concentration of caprolactam in the first-effect concentrated solution produced is 25wt%; the produced one-effect concentrated solution is inp...

Embodiment 3

[0039] Embodiment 3: The device in the present embodiment is the same as in Embodiment 1, and the specific process for concentrating and recycling the caprolactam aqueous solution includes the following steps:

[0040] (1) Before the operation of the system, first use 1MPa fresh steam to establish the steam balance of the whole system, and continuously input it in the whole treatment process;

[0041] (2) Pass the aqueous solution containing 10wt% caprolactam from the nylon 6 slicing device into the raw material preheater at a flow rate of 30000kg / h for preheating, the preheating temperature is 90°C, and the raw material is passed into the first-effect falling film evaporator after the temperature reaches , heated to 132°C in the first-effect falling film evaporator, at this time, the boiling point of the material is 123°C, and the caprolactam concentration in the produced first-effect concentrated solution is 30wt%; the produced one-effect concentrated solution is input by the...

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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, and relates to the wastewater treatment process in the production process of nylon 6, in particular to a concentration recycling device and treatment process for low-concentration aqueous solution containing caprolactam. Background technique [0002] The polymerization reaction of nylon 6 is an equilibrium reaction, so about 10% of the monomer caprolactam and cyclic polymer will be produced in the production of nylon 6 chips, especially the cyclic dimer will cause serious harm to the polymerization process, and it is necessary to Use pure water and nylon 6 slices to extract countercurrently in the extraction tower. The unreacted caprolactam and its oligomers in the slices enter the pure water. After the slices are extracted, they are dried and cooled to obtain the finished product. The extraction water contains about 10% caprolactam and oligomers. . This part of caprolactam ex...

Claims

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Application Information

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Patent Type & Authority Applications(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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