Rectification technology capable of separating rectifying section from stripping section

Abstract

The invention relates to a rectification technology capable of separating a rectifying section from a stripping section. The rectification technology comprises a dehydration technology and a refining technology which comprise the following steps: leading target product containing waste liquid to flow in a dehydration tower A for rectifying, leading materials on the top of the dehydration tower A to enter a dehydration tower B, leading materials at the top of the dehydration tower B to enter a product tower A, leading materials on the top of the product tower A to enter the dehydration tower B, leading materials on the top of the dehydration tower B to enter a product refining tower A, leading materials at the top of the product refining tower A to enter a product refining tower B, and condensing to obtain a qualified product. The rectification technology has the following advantages: 1) the installation height of equipment can be reduced; 2) energy-saving purpose is achieved; 3) the decomposition of target products can be inhibited; 4) secondary pollution can be decreased; 5) the corrosion to the equipment can be reduced; 6) the product yield is high; and 7) the deionized water can be recycled.

Description

technical field [0001] The invention relates to a rectification process which separates a rectification section and a stripping section, and belongs to the field of separation and purification of substances. Background technique [0002] DMAC / DMF / DMSO (dimethylacetamide / N,N-dimethylformyl / dimethyl sulfoxide), can dissolve a variety of compounds, can be completely miscible with water, ether, ketone, ester, etc., has thermal It is characterized by high stability, low hydrolysis and low corrosion, and is widely used in petroleum processing and organic synthesis industries. Taking DMAC as an example, DMAC has good solubility for various resins, especially polyurethane resin and polyimide resin, and is mainly used as a solvent for heat-resistant synthetic fibers, plastic films, coatings, medicines, and acrylonitrile spinning. In organic synthesis, DMAC is an excellent catalyst, which can accelerate reactions such as cyclization, halogenation, cyanation, alkylation and dehydrogen...

AI Technical Summary

Problems solved by technology

However, in the process of production and use, a large amount of waste water containing DMAC is produced, and direct discharge will have a great impact on the water quality environment and endanger people's health. Therefore, the recovery and treatment of DMAC waste liquid is very important for environmental protection and reduction of production costs of enterprises. are of great significance

[0003] In the traditional process, the removal of moisture can be designed as a one-tower process, but if the moisture content in the raw material is high, if you want to obtain qualified DMAC / DMF / DMSO products, you need to increase the reflux ratio appropriately when the entire process extracts moisture, and The latent heat of vaporization of water is relatively large. When the reflux ratio is increased, the energy consumption will increase accordingly.

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