Resource recycling method for N-methylmorpholine oxide in lyocell fiber production process

A technology of methylmorpholine and production process, which is applied in the field of recovery of N-methylmorpholine oxide in the production process of lyocell fiber, which can solve the problems of short resin life, heavy pollution in the recovery process, unstable production process, etc. , to achieve the effect of reducing recycling cost, short service life and cost reduction

Inactive Publication Date: 2018-12-21
SHANDONG YINGLI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method uses hydrogen peroxide to oxidize morpholine to N-nitrosomorpholine, which has strong carcinogenicity. Hydrogen peroxide only oxidizes and bleaches pigments to cause enrichment of other organic impurities, which has no meaning for NMMO purification, resulting in unstable production process.
[0005] In summary, the existing NMMO recovery methods still have many problems such as unsatisfactory recovery effect, heavy pollution in the recovery process, and short resin life. Therefore, it is necessary to study a new recovery method for NMMO in the production process of lyocell fiber

Method used

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  • Resource recycling method for N-methylmorpholine oxide in lyocell fiber production process

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Effect test

Embodiment 1

[0049] A method for resourceful regeneration of ion exchange resins in the production process of lyocell fibers, comprising the steps of:

[0050] Step 1, the first resource regeneration:

[0051] 1) First drain the NMMO solution in the ion exchanger, and then continuously inject fresh water to clean the ion exchanger. The cleaning solution generated by cleaning is divided into three stages for recovery, and the cleaning solution in the first stage is recovered and mixed with The previously discharged NMMO solution is used together as the NMMO solution to be recovered; the cleaning solutions of the second stage and the third stage are recovered and stored separately, and used as primary reuse water and secondary reuse water for the next cleaning of the ion exchanger;

[0052] 2) Regenerate the cation exchange membrane in the ion exchanger after step 1) cleaning: continuously feed the acid regeneration solution to clean the cation exchange membrane, the acid regeneration soluti...

Embodiment 2

[0071] A kind of recycling regeneration method of ion exchange resin in the lyocell fiber production process, with embodiment 1, difference is:

[0072] In step 1), end the recovery of the first stage when the NMMO in the cleaning solution is 1%, and enter the recovery of the second stage; end the recovery of the second stage when the NMMO in the cleaning solution is 0.05%, and enter the recovery of the third stage .

[0073] In step 2), the alkali that constitutes the alkali regeneration solution is potassium hydroxide; the saturated brine that constitutes the alkali regeneration solution is a saturated potassium chloride solution; in the alkali regeneration solution, the mass concentration of the alkali is 3%, and the salt The concentration of the lye is 5%; the alkali lye after the cleaning is diluted 80 times with pure water and is discharged when the Hazen color is less than 100 with a 50ml colorimetric tube, and the recovery of the second stage is entered; the lye after ...

Embodiment 3

[0076] A kind of recycling regeneration method of ion exchange resin in the lyocell fiber production process, with embodiment 1, difference is:

[0077] In step 1), end the recovery of the first stage when the NMMO in the cleaning solution is 3%, and enter the recovery of the second stage; end the recovery of the second stage when the NMMO in the cleaning solution is 1%, and enter the recovery of the third stage .

[0078] In step 2), the alkali that constitutes the alkali regeneration solution is potassium hydroxide; the saturated brine that constitutes the alkali regeneration solution is a saturated potassium chloride solution; in the alkali regeneration solution, the mass concentration of the alkali is 5%, and the salt The concentration of the lye is 20%; the lye after the cleaning is diluted 80 times with pure water and used as a 50ml colorimetric tube to complete the discharge when the Hazen color is less than 1000, and the recovery of the second stage is entered; the lye...

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Abstract

The invention relates to a resource recycling method for N-methylmorpholine oxide in a lyocell fiber production process, and belongs to the field of lyocell fiber. The method comprises the following steps: 1) filtering and recycling N-methylmorpholine oxide for producing lyocell fiber through a recycling system to be ready for use; 2) performing decolorization and ion removal on the N-methylmorpholine oxide in step 1) by an anion-cation exchanger; the brand numbers of ion exchange membranes being A500, LX-70B, DOC2001, and C150; 3) allowing the N-methylmorpholine oxide in step 2) to be concentrated in an evaporation system, thereby achieving the recycling of N-methylmorpholine oxide. Meanwhile, in the resource regeneration method of ion exchange resin provided by the present invention, thevariation characteristics of the concentrations of a cleaning liquid and a regeneration liquid in the regeneration process are fully considered, and the cleaning liquid and the recycling liquid are fully recycled as resources, thereby effectively reducing the regeneration cost of the ion exchange resin.

Description

technical field [0001] The invention relates to the field of lyocell fibers, in particular to a method for recovering N-methylmorpholine oxide in the production process of lyocell fibers. Background technique [0002] N-methylmorpholine oxide (NMMO) is a non-toxic, harmless and environmentally friendly solvent. The International Bureau of Man-made Fiber Standardization (BISFA) named the regenerated cellulose fiber produced by organic solvent dissolution as "Lyocell" ( Chinese "lyocell"), lyocell fiber is a new type of cellulose fiber produced by dissolving cellulose pulp in NMMO aqueous solution and performing dry and wet spinning without chemical reaction. Lyocell fiber has excellent mechanical properties , with the comfort of cotton fiber and the strength of polyester, lyocell is a green fiber, its raw material is inexhaustible cellulose in nature, and the waste is biodegradable. In the actual production process, due to temperature changes or the catalysis of trace transi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J47/00B01J49/00D01F13/02
CPCB01J47/00B01J49/00D01F13/02Y02P70/62
Inventor 孙华鹏韩荣桓李永威颜世雨
Owner SHANDONG YINGLI IND
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