Method for extracting butyraldehyde and butanol mixture and octenal and octanol mixture from waste liquid discharged by butanol-octanol device

Abstract

The invention relates to a method for extracting a butyraldehyde and butanol mixture and an octenal and octanol mixture from waste liquid discharged by a butanol-octanol device, belonging to preparation methods of acyclic alcohol and acyclic aldehydes, particularly relating to the resource utilization and the treatment of the waste liquid discharged by the butanol-octanol device. The method is characterized by using a C4 fractionating tower system and a C8 fractionating tower system, wherein the butyraldehyde and butanol mixture is distilled off at the top of the C4 fractionating tower, and the octenal and octanol mixture is distilled off at the top of the C8 fractionating tower. The invention provides the method for extracting the butyraldehyde and butanol mixture and the octenal and octanol mixture from the waste liquid discharged by the butanol-octanol device, and the method lightens the wastewater treatment load of the butanol-octanol device, has the advantages of simple treatmentprocess, equipment investment saving and low operation cost and carries out the resource treatment of the waste liquid discharged by the butanol-octanol device so as to fully and effectively utilize the byproducts, such as butyraldehyde, butanol, octenal and octanol, The invention realizes the resource treatment of the waste liquid discharged by the butanol-octanol device.

Description

technical field [0001] The invention relates to a method for extracting the mixture of butyraldehyde and butanol and the mixture of octenal and octanol from the waste liquid discharged from a butanol device. It belongs to the preparation method of acyclic monohydric alcohol and acyclic monohydric aldehyde. In particular, it relates to resource utilization and treatment of waste liquid discharged from a butanol plant. Background technique [0002] The low-pressure oxo synthesis process of butanol and octanol is that propylene is mixed with synthesis gas (CO+H) in the presence of a rhodium-phosphine complex catalyst. 2 ) react to produce n-butyraldehyde and isobutyraldehyde. After n-butyraldehyde is separated from isobutyraldehyde, it condenses under the catalysis of sodium hydroxide solution to form octenal, and octenal is hydrogenated under the action of copper catalyst to form octanol (2-ethylhexanol). ; The direct hydrogenation reduction principle of the mixture of n-bu...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the components, it is difficult to process and comprehensively utilize them. The current treatment methods are mainly direct discharge or only incineration, which wastes energy and pollutes the environment and water sources.

The technology of extracting the mixture of butyraldehyde and butanol and the mixture of octenal and octanol by using the waste liquid discharged from the butanol device as raw material, and reusing it as a resource has not yet been seen.

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