Acrylonitrile purifying unit

Abstract

The invention discloses an acrylonitrile purifying unit comprising a distilling apparatus, wherein a discharging hole of the distilling apparatus is connected with more than one cooler by a pipeline; the purifying unit also comprises a raw nitrile filter filled with absorbent for removing oxazole organic matters during working; the raw nitrile filter is provided with a feeding hole and a discharging hole which is connected with the discharging hole of the distilling apparatus by a pipeline. The acrylonitrile purifying unit is provided with the raw nitrile filter in front of the distilling apparatus, and the raw nitrile filter can be filled with the absorbent for removing oxazole organic matters during contacting acrylonitrile raw materials, thus the acrylonitrile raw materials can firstlyremove oxazole, and then enters in the distilling apparatus to remove heavy constituents, and finally the acrylonitrile raw materials according with the requirement are obtained.

Description

technical field [0001] The invention relates to chemical preparation, in particular to an acrylonitrile purification device in the production using acrylonitrile as raw material. Background technique [0002] Acrylonitrile is an important organic chemical raw material, which is mainly used in the production of acrylic fiber, polyacrylamide, resin, paint and pharmaceutical industries. The quality of acrylonitrile raw material will directly affect the performance of processed products, so it is required in some applications The acrylonitrile raw material meets certain purity requirements and / or removes some impurities. In the prior art, there is a method of purifying acrylonitrile as a low-boiling point distillate with a distillation tank or a distillation tower, but the distillation tank or distillation tower cannot remove propylene Oxazole organics contained in nitrile raw materials, and oxazole organics contained in acrylonitrile raw materials not only affect the color and ...

AI Technical Summary

Problems solved by technology

[0002] Acrylonitrile is an important organic chemical raw material, which is mainly used in the production of acrylic fiber, polyacrylamide, resin, paint and pharmaceutical industries. The quality of acrylonitrile raw material will directly affect the performance of processed products, so it is required in some applications The acrylonitrile raw material meets certain purity requirements and / or removes some impurities. In the prior art, there is a method of purifying acrylonitrile as a low-boiling point distillate with a distillation tank or a distillation tower, but the distillation tank or distillation tower cannot remove propylene Oxazole organics contained in nitrile raw materials, and oxazole organics contained in acrylonitrile raw materials not only affect the color and storage stability of acrylonitrile, but also affect the color and performance of polymer products obtained from it In addition, acrylonitrile has the characteristics of easy self-polymerization of pure products, and the discharge pipe of the distillation tank or distillation tower of the existing purification equipment directly leads to the storage tank, which is easy to self-polymerize and cause losses

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