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Method of Recovering Aqueous N-Methylmorpholine-N-Oxide Solution Used in Production of Lyocell Fiber

a technology of lyocell fiber and aqueous solution, which is applied in the field of recovery method of lyocell fiber recovery solvent, can solve the problems of high processing cost, large amount of lyocell fiber, and high cost of primary nmmo dissolving solvent, so as to reduce material cost, promote purity of concentrated aqueous solution, and reduce waste discharge

Inactive Publication Date: 2014-01-09
ACELON CHEM & FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method for recovering a solution containing N-Methylmorpholine-N-Oxide (NMMO) from production of Lyocell fiber. The solution is treated with activated carbon to remove impurities, and then concentrated using a evaporating system. The solution is then purified and reused in the production process. The method is efficient, cost-effective and environmentally friendly. The technical effects include reduction of waste and material costs, as well as improved competitiveness and environmental compliance.

Problems solved by technology

However, the primary NMMO dissolving solvent is relatively expensive.
Accordingly, how to further reduce the processing cost in recovering primary NMMO dissolving solvent from NMMO aqueous solution so as to indirectly low down the overall processing cost in production process of Lyocell fiber via the primary NMMO dissolving solvent becomes a urgent and critical issue.

Method used

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  • Method of Recovering Aqueous N-Methylmorpholine-N-Oxide Solution Used in Production of Lyocell Fiber
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  • Method of Recovering Aqueous N-Methylmorpholine-N-Oxide Solution Used in Production of Lyocell Fiber

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embodiment example 1

[0044]Please refer to FIG. 3, which is a schematic diagram of a preferred exemplary embodiment in a bleach step showing the addition of activated carbon powder therein in association with a disposition of an agitation blower for the present invention. After previous processes of bleach (step 101) and filtration (step 102), the collected aqueous NMMO solution 1 of the Lyocell fiber will contain NMMO in 3.92 wt % weight percentage. Then, the collected aqueous NMMO solution 1 is input into the first evaporating vessel 10 via input pipe 50 by orderly passing third steam tank 31, second steam tank 21 and first steam tank 11 as well as heat exchanger 6 and input pump 51. Because the aqueous NMMO solution 1 has orderly passed third steam tank 31, second steam tank 21 and first steam tank 11, the steam evaporated by the recovered aqueous solution at the outlets of the first evaporating vessel 10, second evaporating vessel 20 and third evaporating vessel 30 can be fed back to the first evapo...

embodiment example 2-9

[0070]The processing procedure of bleach step for preferred exemplary embodiment example 2-9 in the present invention is the same as that for preferred exemplary embodiment example 1 but with following differences.

[0071]Outlet Concentration: In range of 10-20 wt % for the recovered aqueous NMMO solution 1 of the first evaporating vessel 10 (measured by first concentration meter 15).

[0072]Outlet Concentration: In range of 22-38 wt % for the recovered aqueous NMMO solution 1 of the second evaporating vessel 20 (measured by second concentration meter 25).

[0073]For other operating parameters such as outlet concentration (OC), degree of vacuum (DV) and operating temperature (OT), they are listed in the Table-1. Moreover, for other key operating parameters such as inlet quantity before recovery (IQBR), outlet quantity after recovery (OQAR), concentration before recovery (CnBR) and concentration after recovery (CnAR), they are also listed in the Table-2. Thus, the recovery efficiency (RVEf...

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Abstract

A method of recovering aqueous N-Methylmorpholine-N-Oxide solution used in production of Lyocell fiber comprises following steps. Bleach means for decoloring coloration in aqueous NMMO solution via alternate blow-mixing adsorption mode and static suspending adsorption mode reiteration. Filtration means for purifying the activated carbon powder and impurities by two filtering stages of first coarse filtering stage and second fine filtering stage. Concentration means for intensifying aqueous NMMO solution to obtain a condensed aqueous solution without NMMO solvent and a concentrated aqueous solution with NMMO solvent respectively by a sequential multi-stage evaporating system. Refinement means for purifying aqueous NMMO solution with promoting purity of concentrated aqueous solution to obtain required recovered aqueous solution by adding suitable agents in the redox reactions involved. Owing to streamlining and simplicity, the method not only has better competitiveness from promoted recovery cost, efficiency and quality but also meets regulations of environmental protection.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This is a Continuation in part of Non provisional application, Ser. No. 12 / 818,912, field Jun. 18, 2010. entitled “Method of recovering aqueous n-methylmorpholine-n-oxide solution used in production of lyocell fiber”FIELD OF THE PRESENT INVENTION[0002]This invention relates to a recovering method of solvent used in production of fiber, more particularly to a recovering method of solvent used in production of Lyocell fiber.BACKGROUND OF THE INVENTION[0003]Lyocell fiber is made from natural cellulose. Consequently, waste products of Lyocell fiber are naturally biodegradable and are eco-friendly without incurring environmental issues. Lyocell fiber has mechanical strength and tenacity near to that of synthetic fiber. Moreover, Lyocell fiber has excellent draping property, sufficient thickness feeling, comfortable in touch feeling, nice hygroscopicity and easy in dyeing. Furthermore, Lyocell fiber is easily blend-spinning with other materials ...

Claims

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Application Information

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IPC IPC(8): D01F13/00
CPCD01F13/00D21C11/0007D01F13/02Y02P70/62
Inventor CHOU, WEN-TUNGLAI, MING-YIHUANG, KUN-SHAN
Owner ACELON CHEM & FIBER
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