Method for recovering DMF (Dimethyl Formamide) in synthetic leather production waste liquid

A recycling method and synthetic leather technology, applied in organic chemistry, carboxylic acid amide separation/purification, etc., can solve the problems of waste of production raw materials, environmental pollution, etc., reduce energy consumption, reduce operating costs, and solve the problem of product denaturation and deterioration Effect

Inactive Publication Date: 2022-04-12
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the wet process will produce a large amount of waste water containing DMF (i.e. dimethylformamide). If it cannot be effectively recycled, it will pollute the environment and cause waste of raw materials for production.

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  • Method for recovering DMF (Dimethyl Formamide) in synthetic leather production waste liquid

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Embodiment Construction

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circums...

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Abstract

The invention discloses a method for recovering DMF (Dimethyl Formamide) in synthetic leather production waste liquid, and belongs to the field of polyurethane solvent DMF waste liquid recovery treatment. According to the method for recovering the DMF in the synthetic leather production waste liquid, the DMF is separated and refined by using the pervaporation membrane, the dehydrated DMF meets the water content requirement, and the dehydration efficiency is very high; and repeating the process for multiple times on the dehydrated DMF crude product to obtain a high-purity DMF finished product. Compared with a traditional DMF removal method, the method has the advantages that the DMF recovery efficiency is high, and the operation cost is greatly reduced; the membrane separation process is realized by adopting liquid feeding, so that the DMF is prevented from being vaporized again in the dehydration process, the energy consumption is greatly reduced, and the problem of product degeneration and deterioration caused by repeated heating of the DMF is solved; the DMF waste liquid is recycled, so that the method is environment-friendly and economical.

Description

technical field [0001] The invention belongs to the field of recovery and treatment of polyurethane solvent DMF waste liquid, in particular to a method for recovering DMF in synthetic leather production waste liquid. Background technique [0002] Synthetic leather has become an essential material in people's lives and is widely used in clothing, shoes, cameras, mobile phones, furniture coverings and wall interiors. With the improvement of the market's requirements for the quality and variety of synthetic leather, the demand for personalization and functionalization is increasing, and the demand is also increasing. In recent years, the main production processes of synthetic leather are dry process and wet process. Coated on the surface of the base cloth, and then enter the "H 2 O-DMF" coagulation bath, which solidifies polyurethane to form a filler or coating with a microporous structure. Since the synthetic leather produced by the wet process has better performance, it is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/24C07C233/03
Inventor 栾飞张靖惠李先浩
Owner SHAANXI UNIV OF SCI & TECH
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