Technological method for transferring hydrogenation for sec-butyl acetate by secondary butyl alcohol and simultaneously producing methyl ethyl ketone

Abstract

The invention relates to a technological method for transferring hydrogenation for sec-butyl acetate by sec-butyl alcohol and simultaneously producing methyl ethyl ketone. According to the method, the composition of sec-butyl alcohol and sec-butyl acetate is taken as a raw material, the transferring hydrogenation for sec-butyl acetate by sec-butyl alcohol is realized under the effect of a hydrogenation catalyst, and the sec-butyl alcohol is dehydrogenized, so that the methyl ethyl ketone is obtained, the sec-butyl acetate is subjected to transferring hydrogenation, so as to produce the sec-butyl alcohol and ethyl alcohol; the produced sec-butyl alcohol is dehydrogenized, so that the methyl ethyl ketone is obtained. A product is subjected to gas-liquid separation, high-purity hydrogen is obtained, and a liquid product is subjected to distillation separation firstly, so that the composition of ethyl alcohol and methyl ethyl ketone is obtained, and the sec-butyl alcohol or the composition of the sec-butyl alcohol and the sec-butyl acetate in a column reactor returns a transferring hydrogenation reactor, so as to be reacted continuously; the composition of ethyl alcohol and the methyl ethyl ketone is subjected to extractive distillation firstly, so that a high-purity methyl ethyl ketone product is obtained, an extraction agent containing ethyl alcohol in the column reactor is rectified again, a high-purity ethyl alcohol product is obtained, and the extraction agent in the column reactor returns an extractive distillation column to be recycled. The method solves the problems that the sec-butyl acetate and the sec-butyl alcohol are azeotropic and high-purity sec-butyl alcohol and methyl ethyl ketone cannot be obtained.

Description

technical field [0001] The invention belongs to the technical field, and in particular relates to a process for producing methyl ethyl ketone by transferring and hydrogenating sec-butyl acetate with sec-butanol. Background technique [0002] Methyl ethyl ketone is an important chemical raw material. Due to its excellent solubility, it can be miscible with various hydrocarbon solvents, and has no effect on the content and viscosity of the dissolved solute, so it is widely used in coatings, adhesives and ink industries; The method can produce methyl ethyl ketone peroxide, methyl allyl ketone, methyl amyl ketone oxime, diacetyl, etc., which can be used in the production of spices, coating antioxidants and corrosion inhibitors. [0003] At present, the traditional production process of methyl ethyl ketone adopts the hydration of butene to produce sec-butanol, and sec-butanol is produced by dehydrogenation under the action of copper-based catalyst. [0004] With the advancement...

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Problems solved by technology

[0006] But no matter adopting transesterification or hydrogenation method to produce sec-butanol, the 100% conversion of sec-butyl acetate cannot be realized due to the limitation of reaction balance or selectivity, and sec-butyl acetate and sec-butanol form an azeotropic system, a total of The boiling point of the boiling system (98.72°C) is very close to the boiling point of sec-butanol (99.5°C), which makes it impossible to obtain high-purity sec-butanol. Therefore, the process scheme in the above patent is used to market high-purity sec-butanol and methyl ethyl ketone. above is impossible

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