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Recovery method for NMMO solvent in fibre production by solvent method

A recovery method and technology of a solvent method are applied in the recovery field of solvent N-methylmorpholine oxide, can solve problems such as unfavorable control cost, pollute the environment, large amount of water vapor, etc., achieve environmental protection and reduce production cost , the effect of saving energy consumption

Active Publication Date: 2008-10-08
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned recovery method consumes a large amount of water vapor, which is not conducive to cost control, and the solvent recovery rate is not high. The remaining NMMO is discharged with the wastewater, which not only pollutes the environment but also causes a waste of useful resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The recycling of the NMMO waste liquid collected from the coagulation bath and the drawing tank includes the following steps:

[0028] 1. The NMMO waste liquid a (concentration 25%, weight 811 kilograms) and waste liquid b (concentration 12%, weight 695 kilograms) reclaimed from coagulation bath and drawing tank are mixed by mixer (the mixing ratio of a, b waste liquid 6~5:4~5), the mixed waste liquid c (concentration 19%) is sent into the head tank.

[0029] 2. The waste liquid c passes through a mechanical filter to remove solid impurities and enters the clear liquid storage tank.

[0030] 3. Put the filtered liquid into the cationic resin exchange column at a flow rate of 3.2BV / h to remove metal ions and put the treated liquid into the clear liquid storage tank.

[0031] 4. Put the liquid after removing metal ions into the anion resin exchange column at a flow rate of 3.2BV / h to remove colored substances and decomposition products, and put the treated liquid into th...

Embodiment 2

[0036] The recovery treatment of the NMMO waste liquid recovered from the washing tank includes the following steps:

[0037] 1. Waste liquid a (concentration 0.05%, weight 645.8 kilograms) and waste liquid b (concentration 1.86%, weight 872.2 kilograms) containing NMMO from each washing tank are mixed through a mixer, and the concentration of NMMO waste liquid c after mixing is 0.82%.

[0038] 2. The waste liquid c enters the high-level tank after removing solid impurities through a mechanical filter.

[0039] 3. Put the filtered solvent into the cationic resin exchange column at a flow rate of 3.6BV / h and put the collected solution into the clear liquid storage tank.

[0040] 4. Pour the liquid in the clear liquid storage tank in step 3 into the anion resin exchange column at a flow rate of 3.6BV / h and put the collected liquid into the clear liquid storage tank.

[0041] 5. Pour the liquid in the clear liquid storage tank in step 4 into the reverse osmosis treatment tank f...

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PUM

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Abstract

The invention relates to a recycling method of NMMO waste liquor, which provides a recycling method of NMMO in the waste liquor of fiber production with solvent method. According to the specific method of the invention, after passes through in sequence the cation resin exchange column and the anion resin exchange column, the NMMO waste liquor is in decompression and evaporation to the refractive index of 1.480 and cooled, thus the NMMO containing a crystallization water is produced. The cation resin is the macroreticular type or gel-type strong acid polystyrene cation exchange resin, and the anion resin is the macroreticular type or gel-type alkalescence acrylic acid anion resin. Compared with the prior recycling method, in the method of the invention, the recovery rate of the NMMP waste liquor is increased from 95% to 99.5%. In the discharged wastewater after the recycling, the concentration of NMMO is reduced and the steam is saved. Therefore, the textile production costs are greatly reduced.

Description

technical field [0001] The invention relates to a method for recovering solvent N-methylmorpholine oxide (NMMO), belonging to the field of solvent-based fiber production. Background technique [0002] Use a large amount of NMMO solvents in the existing fiber production, usually contain following several substances in the waste liquid that receives from coagulation bath etc. places after spinning and high-temperature dissolution process usually: N-methylmorpholine oxide ( NMMO), suspended impurities (filaments and cellulose gel blocks), colored impurities (colored decomposition products morpholine and N-methylmorpholine produced by NMMO at high temperature, etc.) and metal ions (from pulp, NMMO and fiber Equipment, pipelines, etc. that are in contact with it during the production process). In order for NMMO to be reused, these impurities must be removed through recycling engineering, so solvent recovery plays a very important role in fiber production. [0003] The existing ...

Claims

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Application Information

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IPC IPC(8): D01F13/00
CPCY02P70/62
Inventor 冯涛王义陈谋楷
Owner YIBIN GRACE GROUP CO LTD
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