Carbon fiber production wastewater separation treatment and resource utilization process method and device

Abstract

The invention provides a separated treatment and resource utilization technological method and device for carbon fiber production wastewater. The device comprises a first vacuum pump unit, a second vacuum pump unit, an acrylonitrile removing tower, a dimethyl sulfoxide concentrating tower, a crude product tower and a refining tower. According to the method, wastewater containing 0.5%-1% of acrylonitrile and 1%-5% of dimethyl sulfoxide enters the acrylonitrile removing tower and is subjected to acrylonitrile removal through pressure reduction for separated treatment, tower bottom solution wastewater is subjected to water removal through pressure reduction in the dimethyl sulfoxide concentrating tower and the crude product tower, the content of dimethyl sulfoxide is up to 99%, the dimethyl sulfoxide is subjected to pressure-reducing distillation in the refining tower, and accordingly, dimethyl sulfoxide with the purity higher than 99.97% is obtained. According to the method and the device, the wastewater is subjected to acrylonitrile removal through pressure reduction for separated treatment, the environmental protection treatment problems that the wastewater containing acrylonitrile is difficult to degrade, the treatment cost is high and the like are solved, distillation extraction and high-purity refining recovery of low-concentration dimethyl sulfoxide in the wastewater are realized synchronously, the technological process is simple, the resource recovery efficiency is high, the purity of recovered dimethyl sulfoxide is high, and the wastewater treatment cost is greatly reduced.

Description

technical field [0001] The invention relates to a process method for the separation, quality and resource utilization of production wastewater in the field of new carbon fiber materials, and is suitable for the separation, quality and environmental protection treatment of dimethyl sulfoxide-acrylonitrile ternary organic waste water and the resource utilization of dimethyl sulfoxide. Background technique [0002] Carbon fiber is a new material with excellent mechanical properties. It is widely used in aviation, aerospace, construction, sports, automobile, medical and other fields, and has become a hot spot for research and development in the domestic new material industry. At present, domestic carbon fiber enterprises mostly use dimethyl sulfoxide one-step wet spinning process for raw silk preparation. In the production process of polyacrylonitrile carbon fiber precursors, especially the one-step production process of dimethyl sulfoxide, the production process mainly produces...

AI Technical Summary

Problems solved by technology

The toxicity of acrylonitrile itself to microorganisms and the permeability of dimethyl sulfoxide make the passive environmental protection treatment technologies such as biochemistry and degradation used in this type of organic wastewater, which have many problems such as high treatment cost and difficult environmental protection discharge.

At present, there is no comprehensive treatment process and technology integrating safety, low cost and resource utilization for this kind of organic wastewater. The imperfect supporting sewage treatment technology in the industry has become one of the bottlenecks restricting the domestic scale of carbon fiber.

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