Recovery process of anion exchange resin in a solvent recovery process

Abstract

The invention provides a resuscitation technology of an anion exchange resin during a solvent recovery process. The resuscitation technology comprises the resuscitation of the anion exchange resin. Anion exchange resin resuscitation fluid is adopted to be subjected to resuscitation on the anion exchange resin, wherein the concentration of sodium hydroxide in the resuscitation fluid is 2%-3%. The resuscitation technology is low in cost to use; change of anion exchange resin(15m<3>) costs about 380 thousand RMB per time, while recovery costs about 12 thousand RMB per time; the resuscitation technology has a high safety performance during the use procedure, does not damage the resin and the safety of workers during the operation process; meanwhile, the resuscitation technology does not need to change the original structures of the equipment, thereby having no harmful effects on anion-cation machine tool equipment.

Description

technical field [0001] The invention relates to a recovery process of an ion exchange resin, in particular to a recovery process of an anion exchange resin in a solvent recovery process. Background technique [0002] In the production of Lyocell fiber, the solvent (NMMO) needs to be purified and recovered. Anion and cation exchange resins are used for solvent purification. Anion and cation exchange resins will be polluted or poisoned after a long period of operation. Anion and cation exchange resins are mainly affected by the recovery of iron in solvents, etc. High-valent metal ions and various high-molecular organic substances generate intolerant deposits and deposit into the resin, blocking the ion exchange channel, thus affecting the normal ion exchange process of the resin. The specific performance is that the color of the resin becomes darker and the volume expands; Prolongation, difficulty in regeneration operation; increase in conductivity and other phenomena. [000...

AI Technical Summary

Problems solved by technology

[0005] 1. Ion exchange resin will be polluted or poisoned after long-term use;

[0006] 2. In the prior art, after long-term use of ion exchange resins, high-valent metal ions and various polymeric organic substances generate intolerant deposits and deposit inside the resin, blocking the channels of ion exchange and reducing the purification and recovery effect of the resin;

[0007] 3. As the ion exchange resin is used for a long time, the color of the resin will become darker and the volume will expand; the washing time will be prolonged, the conductivity will increase, and the regeneration operation will be difficult;

[0008] 4. The cost of replacing a new ion exchange resin is relatively high, which increases production costs

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