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Recovery method of N-methylmorpholine oxide solvent in process of generating regenerated protein fibre by solvent method

A technology for regenerating protein and methylmorpholine, which is applied in the fields of fiber chemical characteristics, rayon recycling, and final product manufacturing, can solve the problems of NMMO solvent loss, difficulty in industrial promotion, and increased production cost of regenerated protein fibers Effects of burden, life extension, and ease of operation

Inactive Publication Date: 2012-07-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During evaporation and concentration, the condensed water will contain some volatile substances such as amines and solvents, etc. Reverse osmosis or cation exchange resin should be used to effectively separate residual amines, amine oxides and other substances, but the recovery of condensed water will easily cause the loss of NMMO solvent
The cumbersome and complicated process will increase the production cost of regenerated protein fibers by NMMO solvent method, making it difficult to realize industrial promotion

Method used

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  • Recovery method of N-methylmorpholine oxide solvent in process of generating regenerated protein fibre by solvent method
  • Recovery method of N-methylmorpholine oxide solvent in process of generating regenerated protein fibre by solvent method

Examples

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Effect test

Embodiment 1

[0029] See figure 1 .

[0030](1) In the spinning process production of the regenerated silk protein fiber prepared by the solvent method, the NMMO aqueous solution with a commercially available mass concentration of 50% is used as a solvent to indirectly dissolve silk fibroin leftovers to prepare the regenerated silk protein fiber; the mass concentration is 50% The NMMO aqueous solution is a coagulation bath for regenerated silk protein fibers;

[0031] (2) Along with the carrying out of spinning process, add the NMMO aqueous solution that mass concentration is 25% in the coagulation bath of step (1) with the flow velocity of 140kg / h, make containing mass concentration be 50% with the flow velocity of 270kg / h simultaneously The NMMO aqueous solution discharges the container of loading coagulation bath in the receiving tank, under making the NMMO aqueous solution coagulation bath effectively circulates, the mass concentration of the NMMO aqueous solution coagulation bath in t...

Embodiment 2

[0038] (1) In the spinning process production of regenerated animal hair fiber prepared by solvent method, the NMMO aqueous solution with a commercially available mass concentration of 50% is used as a solvent to indirectly dissolve wool waste to prepare regenerated animal hair fiber; The NMMO aqueous solution is a coagulation bath for regenerated animal hair fibers;

[0039] (2) Along with the carrying out of spinning process, add the NMMO aqueous solution that mass concentration is 10% in the coagulation bath of step (1) with the flow velocity of 0.44kg / h, make containing mass concentration be with the flow velocity of 1.09kg / h simultaneously 50% NMMO aqueous solution discharges the container of loading coagulation bath to receiving tank, under making NMMO aqueous solution coagulation bath effectively circulates, the mass concentration of the NMMO aqueous solution coagulation bath in loading coagulation bath container is controlled at 50%, obtains in receiving tank Containin...

Embodiment 3

[0046] (1) In the spinning process production of the regenerated animal hair fiber prepared by the solvent method, the NMMO aqueous solution with a commercially available mass concentration of 50% is used as a solvent to indirectly dissolve worn-out animal hair clothes to prepare the regenerated animal hair fiber; with a mass concentration of 50% % NMMO aqueous solution is a coagulation bath for regenerated animal hair fibers;

[0047] (2) Along with the carrying out of spinning process, add the NMMO aqueous solution that mass concentration is 18% in the coagulation bath of step (1) with the flow velocity of 84.375kg / h, make containing mass concentration be with the flow velocity of 184.375kg / h simultaneously 50% NMMO aqueous solution discharges the container of loading coagulation bath to receiving tank, under making NMMO aqueous solution coagulation bath effectively circulates, the mass concentration of the NMMO aqueous solution coagulation bath in loading coagulation bath co...

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Abstract

The invention relates to a recovery method of an N-methylmorpholine oxide (NMMO) solvent in a process of generating regenerated protein fibre by a solvent method in a spinning technology. The technical scheme of the invention is designed as follows: NMMO aqueous solution with the mass concentration of 50% is taken as a coagulating bath of the regenerated protein fibre; the circulation of the coagulating bath is optimally controlled so that the mass concentration of the coagulating bath of the NMMO aqueous solution in a coagulating bath-loading container is controlled to be 50%; and multiple impurities in recovery liquid, namely a coagulating bath solution, are removed through rough filtration, microporous membrane microfiltration, anion exchange resin treatment, cation exchange resin treatment and hydrogen peroxide oxidization, thereby achieving the recovery of the NMMO solvent.

Description

technical field [0001] The invention relates to a method for recovering N-methylmorpholine oxide (NMMO) solvent in the process of producing regenerated protein fiber by solvent method in the spinning process. technical background [0002] With the increase of population and economic growth, the demand for textile materials will further increase, but the arable land resources are limited, and the contradiction of grain and cotton competition for land is more prominent. In order to solve the shortage of textile materials, in addition to the development of cellulose fibers and synthetic fibers , the use of high technology to develop regenerated protein fibers is of great significance. The regenerated protein fiber is biodegradable and has excellent performance, which is in line with the green and natural consumption concept of today's consumers, and will have broad market prospects. [0003] For a long time, there have been few reports on the marketization of regenerated prote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F13/02
CPCY02P70/62
Inventor 刘必前汪前东李兰吴杰
Owner INST OF CHEM CHINESE ACAD OF SCI
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