Method for comprehensively utilizing distillation raffinate produced in production of alpha-pyrrolidone and N-vinyl pyrrolidone

Abstract

The invention relates to the technical field of waste treatment, and discloses a method for comprehensively utilizing distillation raffinate produced in production of alpha-pyrrolidone and N-vinyl pyrrolidone. The method comprises the following steps: step 1, putting the distillation raffinate into a pyrolyzing furnace, introducing nitrogen into the pyrolyzing furnace for replacement so as to realize an oxygen-free atmosphere, and heating the distillation raffinate to 480-500 DEG C; and 2, pyrolyzing the distillation raffinate in the step 1 into solid residues and gas-phase substances in a heating state, condensing the gas-phase substances to form lysate and gas, storing the lysate in a liquid storage tank, and subjecting the gas to combustion for heat supply after washing, adsorption anddrying. According to the method, the distillation raffinate produced in production of alpha-pyrrolidone and N-vinyl pyrrolidone is effectively utilized, production benefits are improved, a process issimple and not complex, products are basically free of pollution, and the requirement of environmental protection is met.

Description

technical field [0001] The invention relates to the technical field of waste treatment, in particular to a method for comprehensive utilization of distillation raffinate for the production of α-pyrrolidone and N-vinylpyrrolidone. Background technique [0002] The distillation raffinate of α-pyrrolidone (α-P) and N-vinylpyrrolidone (NVP) is generally a viscous organic substance composed of α-P, NVP and other by-products, which is a block solid at normal temperature and pressure , although the α-P and NVP in the distillation raffinate have a certain recovery value, the separation is difficult, the process is complicated, and the cost is high. Enterprises generally do not recycle. From the perspective of cost and environmental protection requirements, the distillation raffinate is generally Do incineration. This method does not effectively utilize and explore the economic value of the distillation raffinate, and the treatment of the incineration tail gas requires additional fu...

AI Technical Summary

Problems solved by technology

[0002] The distillation raffinate of α-pyrrolidone (α-P) and N-vinylpyrrolidone (NVP) is generally a viscous organic substance composed of α-P, NVP and other by-products, which is a block solid at normal temperature and pressure , although the α-P and NVP in the distillation raffinate have a certain recovery value, the separation is difficult, the process is complicated, and the cost is high. Enterprises generally do not recycle. From the perspective of cost and environmental protection requirements, the distillation raffinate is generally Do incineration

This method does not effectively utilize and explore the economic value of the distillation raffinate, and incineration tail gas treatment requires additional funds

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