Refinement method for recovering butanol and octanol from butanol-octanol waste liquid through cracking reaction and hydrogenation reaction

Abstract

The invention discloses a refinement method for recovering butanol and octanol from a butanol-octanol waste liquid through a cracking reaction and a hydrogenation reaction, and belongs to the technical field of butanol-octanol. In order to solve the problem of not high raw material utilization rate or high energy consumption in the prior art, the present invention provides a method, wherein a n-butanol product is firstly extracted, heavy removing tower bottom heavy components are cracked so as to be further recovered and utilized, the aldehyde in the butanol-octanol waste liquid is subjected to mixing hydrogenation to obtain an alcohol, and a rectification process is performed to obtain the high purity butanol product and the high purity octanol product, wherein the specific steps comprise dehydration, separation of butanol, removal of heavy components, cracking of the heavy components, mixing hydrogenation of butyraldehyde and octanal, hydrocarbon removal, separation of the butanol product, side-line extraction of the octanol product, and other processes. With the refinement method of the present invention, the utilization rate of the butanol-octanol waste liquid is substantially improved, the utilization value is substantially increased, the economic benefits are increased, the complexity of the composition of the material is reduced, the difficulty of the rectification unit is reduced, and the separation cost is reduced.

Description

technical field [0001] The invention relates to a method for recovering butanol and octanol from butanol waste liquid, more specifically, the invention relates to a method for obtaining butanol and octanol products from butanol waste liquid through hydrogenation and refining process. Background technique [0002] Butanol and octanol (referred to as butanol) are mainly used in the production of plasticizers dioctyl phthalate (DOP) and dibutyl phthalate (DBP). With the development of my country's plastics industry, the market demand for octyl alcohol is increasing year by year, and the production capacity of octyl alcohol in China is also increasing year by year. There is a small amount of discharge from the evaporator, phase separator and weight removal tower of the reactor of the butanol plant, and the discharged mixed liquid is called the butanol raffinate, which is equivalent to about 10% of the product quality of butanol, and It contains a lot of valuable components, but...

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Problems solved by technology

[0010] In order to solve the problem of low raw material utilization rate or high energy consumption in the prior art, a method is proposed to first extract the n-butanol product, recombine and decompose the bottom of the weight-removing tower for further recycling, and then waste butanol and octanol The aldehydes in the liquid are mixed and hydrogenated into alcohols, and then undergo a rectification process to obtain high-purity butanol and octanol products

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