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MVR evaporation and concentration process of NMMO solvent

A technology of evaporation concentration and evaporation concentration system, which is applied in the field of MVR evaporation concentration process of NMMO solvent, can solve the problems of unfavorable environment, high operation cost, high energy consumption, etc., and achieve the effect of reducing operation cost, system stability and easy implementation.

Inactive Publication Date: 2016-08-17
BEIJING PUREN MEIHUA ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

[0006] Therefore, in view of the problems of high energy consumption, high operating cost, and environmental disadvantages in the current NMMO solvent evaporation and concentration process, the present invention proposes an evaporation process that utilizes MVR evaporation to concentrate NMMO solvent, and the process uses MVR evaporation and concentration. , greatly reducing energy consumption, lowering operating costs, and meeting the high vacuum requirements of the system

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  • MVR evaporation and concentration process of NMMO solvent

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Embodiment Construction

[0016] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0017] Such as figure 1 Shown, the MVR evaporative concentration process of NMMO solvent of the present invention comprises preheating part and MVR evaporative concentration system, wherein:

[0018] The preheating part includes non-condensable gas preheating and condensate water preheating, making full use of the waste heat of the system, without additional supplementary heat energy, and reducing heat energy consumption.

[0019] The MVR evaporation and concentration system includes the use of secondary steam heating, evaporative concentration, secondary steam recompression and an independent vacuum system, which can not only make reasonable use of the effective temperature difference of the system, reduce energy c...

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Abstract

A MVR evaporation and concentration process of an NMMO solvent includes a preheating part and an MVR evaporation and concentration system, wherein the preheating part includes a non-condensable gas preheating part and a condensed water preheating part, waste heat of the system is fully utilized without additionally supplemented heat energy, and the heat energy consumption is reduced; the MVR evaporation and concentration system includes a vacuum system utilizing secondary steam heating, evaporative concentration, secondary steam re-compression and independence, can reasonably utilize the effective temperature difference of the system to reduce energy consumption, and can also ensure the stable operation of the system. The process adopts an MVR evaporation and concentration mode, greatly reduces the energy consumption, reduces the operation costs and can also meet the high-vacuum requirement of the system.

Description

technical field [0001] The invention relates to a recovery process of fiber spinning solvent NMMO, in particular to recovery of the NMMO solvent by using an MVR (steam recompression technology) evaporation concentration process. Background technique [0002] NMMO solvent (4-methylmorpholine-N-oxide) is an aliphatic cyclic tertiary amine-based oxide with thermal instability and weak alkalinity. It is widely used in organic solvents due to its strong hydrophilicity. Synthesis and use as a solvent for cellulose. [0003] As a natural polymer material, cellulose fiber has attracted much attention due to its good service performance and amazing regeneration speed. NMMO is known as a solvent for cellulose fibers because it is less toxic than alcohol and most of it is recyclable. [0004] The recovery rate of NMMO solvent can be as high as 99%, and its recovery process includes flocculation, filtration, adsorption, ion exchange, H 2 o 2 Oxidation, ultraviolet light irradiation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D1/00B01D1/28B01D1/30C07D295/24
CPCB01D1/00B01D1/0094B01D1/28B01D1/2815B01D1/30C07D295/24
Inventor 张英浦于东川刘建军王晓茵彭靖龄
Owner BEIJING PUREN MEIHUA ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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