A recovery process of cation exchange resin in nmmo solvent recovery process in lyocell fiber production

A cation exchange and resin technology, which is applied in the field of cation exchange resin recovery process in the NMMO solvent recovery process of Lyocell fiber production, can solve the problems of increased conductivity, blocked ion exchange channels, increased production costs, etc., to improve exchange capacity, High safety performance and long service life

Active Publication Date: 2019-08-23
BAODING SWAN NEW FIBER MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 the ion exchange resin, high-valent metal ions and various high-molecular organic matter generate intolerant deposits and deposit inside the resin, blocking the ion exchange channel 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

Method used

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  • A recovery process of cation exchange resin in nmmo solvent recovery process in lyocell fiber production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Recovery process of cation exchange resin in NMMO solvent recovery process in Lyocell fiber production

[0036] Composition of cation exchange resin resuscitation fluid

[0037] The cation resin is recovered and regenerated by using the cation exchange resin resuscitation solution;

[0038] The cation exchange resin resuscitation solution is alkaline saline;

[0039] The concentration of the alkaline saline: sodium chloride concentration: 12%; sodium hydroxide concentration: 3%;

[0040] The amount of alkaline salt water: 33m3; corresponding cationic resin specification: 10m3.

[0041] Cation Exchange Resin Recovery Procedure

[0042] The recovery of cation exchange resin is carried out twice; each recovery includes static top water and dynamic top water; after the second time, positive washing and back washing are carried out, and 3BV regeneration is carried out when the pH reaches 7; 3BV refers to 3 times the volume of the resin.

[0043] Step 1 First re...

Embodiment 2

[0058] Example 2 Recovery process of cation exchange resin in NMMO solvent recovery process in Lyocell fiber production

[0059] Composition of cation exchange resin resuscitation fluid

[0060] The cation resin is recovered and regenerated by using the cation exchange resin resuscitation solution;

[0061] The cation exchange resin resuscitation solution is alkaline saline;

[0062] The concentration of the alkaline saline: sodium chloride concentration: 15%; sodium hydroxide concentration: 2.5%;

[0063] The amount of alkaline salt water: 45m3; corresponding cationic resin specification: 10m3.

[0064] Cation Exchange Resin Recovery Procedure

[0065] The recovery of cation exchange resin is carried out twice; each recovery includes static top water and dynamic top water; after the second time, forward washing and back washing are carried out, and 3BV regeneration is carried out when the pH reaches 6-7; 3BV refers to 3BV of the resin volume. times.

[0066] Step 1 First r...

Embodiment 3

[0081] Example 3 Recovery process of cation exchange resin in NMMO solvent recovery process in Lyocell fiber production

[0082] Composition of cation exchange resin resuscitation fluid

[0083] The cation resin is recovered and regenerated by using the cation exchange resin resuscitation solution;

[0084] The cation exchange resin resuscitation solution is alkaline saline;

[0085] The concentration of the alkaline saline: sodium chloride concentration: 15%; sodium hydroxide concentration: 2.5%;

[0086] The amount of the alkaline saline: 40m3; the corresponding cationic resin specification: 10m3.

[0087] Cation Exchange Resin Recovery Procedure

[0088] The recovery of cation exchange resin is carried out twice; each recovery includes static top water and dynamic top water; after the second time, forward washing and back washing are carried out, and 3BV regeneration is carried out when the pH reaches 6-7; 3BV refers to 3BV of the resin volume. times.

[0089] Step 1 F...

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Abstract

The invention provides a recovering technology of cation exchange resin in a solvent recovery process. The recovering technology comprises recovery of cation exchange resin. The cation exchange resin is recovered by the aid of a cation exchange resin recovery solution; the concentration of sodium hydroxide in the recovery solution is 2%-3%. The recovery technology is an innovation and is simple to operate and extremely low in use cost, and equipment investment is avoided; the replacement of cation resin (10 m<3>) costs about 190,000 yuan each time while recovery costs about 8,000 yuan. The safety performance is high during usage and the resin and operation safety of workers cannot be damaged; adverse effects caused by change of the original structure of equipment on a cation bed can be avoided. The service life of the resin recovered with the method is long; the treatment capacity of new cation exchange resin (10 m<3>) can reach 65,000 m<3>.

Description

technical field [0001] The present invention relates to a recovery process of anion-cation exchange resin, in particular to a recovery process of cation exchange resin in the NMMO solvent recovery process in Lyocell fiber production. 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; increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J49/60B01J49/53
Inventor 赵志德高殿才杜树新蒋志君王文忠张红立曹刚
Owner BAODING SWAN NEW FIBER MFG CO LTD
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