Method for cleaning nylon 6 polymerization and recovery system filler tower

The technology of a recovery system and a packed tower is applied in the field of caprolactam monomer recovery process, which can solve the problems of troublesome packing disassembly and cleaning, waste of monomers, easy blockage of packings, etc., so as to be beneficial to environmental protection, reduce the loss of monomers, and reduce the consumption of monomers. body mass effect

Active Publication Date: 2014-05-07
FUJIAN JINJIANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the traditional pure water method is used to clean the packed tower, the packing will be easily blocked during distillation, which will greatly reduce the mass transfer efficiency of the packed tower. The waste of some monomers brings a high load to the wastewater treatment plant
In addition, it is very troublesome to disassemble and clean the packing in the packed tower, which brings great inconvenience to daily maintenance

Method used

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  • Method for cleaning nylon 6 polymerization and recovery system filler tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Pass superheated steam into the lower part of the packed tower;

[0021] 2) Pass pure water into the upper part of the packed tower;

[0022] 3) The superheated steam rises into the packing and contacts the residue adhered to the packing, and the residue is heated and eluted by pure water, and falls to the bottom of the packing tower, thereby being removed;

[0023] 4) The NaOH solution with a mass percentage concentration of 0.1% is passed into the bottom of the packed tower, and under the action of superheated steam, the cleaning process of the packing can be accelerated.

Embodiment 2

[0025] 1) Pass superheated steam into the lower part of the packed tower;

[0026] 2) Pass pure water into the upper part of the packed tower;

[0027] 3) The superheated steam rises into the packing and contacts the residue adhered to the packing, and the residue is heated and eluted by pure water, and falls to the bottom of the packing tower, thereby being removed;

[0028] 4) The NaOH solution with a mass percentage concentration of 0.2% is passed into the bottom of the packed tower, and under the action of superheated steam, the cleaning process of the packing can be accelerated.

Embodiment 3

[0030] 1) Pass superheated steam into the lower part of the packed tower;

[0031] 2) Pass pure water into the upper part of the packed tower;

[0032] 3) The superheated steam rises into the packing and contacts the residue adhered to the packing, and the residue is heated and eluted by pure water, and falls to the bottom of the packing tower, thereby being removed;

[0033] 4) The NaOH solution with a mass percentage concentration of 1% is passed into the bottom of the packed tower, and under the action of superheated steam, the cleaning process of the packing can be accelerated.

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Abstract

The invention discloses a method for cleaning a nylon 6 polymerization and recovery system filler tower. The method comprises the steps as follows: 1) superheated steam is fed into the lower part of the filler tower; 2) pure water is fed into the upper part of the filler tower; 3) the superheated steam rises into filler and is contacted with residues adhered to the filler, and the residues are heated and fall to the bottom of the filler tower under the elution effect of the pure water, so that the residues can be removed; and 4) an NaOH dilute solution is fed into the bottom of the filler tower, and a cleaning process of the filler is accelerated under the effect of the superheated steam. The method is simple in technology, small in equipment corrosion, capable of remarkably reducing the content of monomers in waste water produced during recovery of caprolactam and reducing the loss of the monomers and beneficial to environmental protection; in addition, the filler inside the filler tower is not required to be cleaned after disassembly, so that daily maintenance is greatly facilitated.

Description

technical field [0001] The invention relates to a caprolactam monomer recovery process in the nylon 6 production process, in particular to a process for cleaning a packed tower to reduce the caprolactam content in waste water. Background technique [0002] In the production of nylon 6, after the hydrolysis polymerization of caprolactam (CPL) is completed, the polymer still contains about 8%-10% of CPL monomers and oligomers. If the CPL is not recycled, it will waste raw material monomers and increase production. cost, which in turn will have an adverse impact on the environment. Therefore, strengthening the recovery of CPL monomer in the production process of nylon 6 can not only bring economic benefits to enterprises, but also protect the environment. [0003] In the past ten years, various engineering companies have studied many technologies, which can directly return the concentrated liquid of extracted water to the polymerizer to participate in polymerization, or recove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B9/08
CPCB08B9/0804
Inventor 吴华新陈万钟郑载禄毕振林庆辉
Owner FUJIAN JINJIANG TECH
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