dmac recycling physical index optimization system

Abstract

The invention relates to a DMAC recycling physical property index optimization system, which belongs to the technical field of spandex production. Including dehydration tower, crude solvent tank, refining tower, distillation tank supply tank and recovery tower, the dehydration tower is connected to the feed pipe, the bottom of the dehydration tower is connected to the middle of the refining tower through the crude solvent tank, and the bottom of the refining tower is connected to the recovery tank through the distillation tank supply tank The bottom of the tower is connected; the middle part of the dehydration tower is connected to a preheater, and the top is connected to a condenser one and a cryocooler one; the top of the refining tower is connected to a condenser two and a cryocooler two; the top of the recovery tower is provided with a condenser three , the condenser three is provided with a condensate receiving tank three, and the top of the condenser three is provided with a vacuum pump three. Adopting the invention to recover DMAC in the spandex production process not only ensures the normal operation of the DMAC rectification system, but also greatly improves the yield and physical property index of the recovered DMAC.

Description

technical field [0001] The invention relates to a DMAC (N,N dimethylacetamide) recovery physical property index optimization system, through the technical transformation of the dehydration tower and the rectification tower of the DMAC rectification system, the optimized DMAC physical property index optimization is realized, and belongs to the technical field of spandex production . Background technique [0002] In the chemical production process, it is often necessary to separate raw materials, intermediate products or crude products to obtain chemical products or intermediate products that meet the process requirements. Common separation processes in chemical industry include distillation, absorption, extraction, drying, and crystallization, among which distillation is a typical unit operation for separating liquid mixtures and is the most widely used. The spandex dry spinning process needs to use a large amount of DMAC as a solvent for recycling. During the solvent dry sp...

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Problems solved by technology

[0004] The packing of the existing rectification system has defects such as low separation efficiency, high energy consumption, and cumbersome operation. In order to overcome the above-mentioned shortcomings of the rectification system, the present invention provides a DMAC recovery physical and chemical index optimization with high separation efficiency, convenient operation, and low energy consumption. system

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