System and method for producing n-butyl acetate by using methyl acetate and n-butyl alcohol ester exchange reaction

Abstract

The invention discloses a method and a system for utilizing transesterification of methyl acetate and n-butanol to prepare n-butyl acetate. The reaction system substantially consists of a reboiler, a catalytic distillation column, a condenser, a feeding pump and a reflux ratio controller; among which, the catalytic distillation column is provided with a liquid collecting plate, a gas exit tube, a catalyst packet, a supporting plate and a catalytic reaction segment consisting of bottom plates. An overflow outlet is arranged on a tube wall of the gas exit tube at the lower end of the liquid collecting place and is higher than the catalyst packet. A lacrimal foramen is arranged on the bottom plate; the catalyst packet and a sieve hole is arranged on the supporting plate; a liquid leaking hole is arranged on the tube wall of the gas exit tube between the supporting plate and the bottom plate. The preparation method is to add the methyl acetate and n-butanol into the column respectively from the top and bottom of the catalytic reaction area. A molar ratio of the methyl acetate to the n-butanol is 0.5:5, a reaction temperature is 50 DEG C to 90 DEG C, and a reflux ratio is 0.5 to 30 under a normal pressure operation. The technical proposal of the invention enhances the conversion rate of the methyl acetate, simplifies the operation procedure and overcomes the problem of equipment corrosion.

Description

technical field [0001] The present invention relates to a kind of system and method for preparing n-butyl acetate, more specifically, relate to a kind of utilizing methyl acetate and n-butanol transesterification method, adopt catalytic distillation method to prepare n-butyl acetate system and method. Background technique [0002] N-butyl acetate is an excellent organic solvent, widely used as a solvent for nitro spray paint, collodion, enamel paint, rubber, artificial leather, linoleum products and various resins, and can also be used for safety glass, textile printing, aircraft coatings, spices, In industries such as medicine, it can also be used as an extractant. At present, in industry, concentrated sulfuric acid is generally used to catalyze n-butanol and glacial acetic acid through batch reaction. Concentrated sulfuric acid has the following disadvantages as a catalyst: concentrated sulfuric acid has esterification, dehydration and oxidation, and there are many side r...

AI Technical Summary

Problems solved by technology

Concentrated sulfuric acid has the following disadvantages as a catalyst: concentrated sulfuric acid has esterification, dehydration and oxidation, and there are many side reactions in the process, resulting in difficulties in product refinement and raw material recovery; catalyst and product cannot be separated, and must be neutralized by alkali, washed with water, etc. The treatment process removes the catalyst and produces a large amount of waste liquid to pollute the environment; in addition, concentrated sulfuric acid severely corrodes the equipment

The transesterification reaction requires an acid or alkali catalyst, is a reversible reaction, is limited by the reaction balance, and forms two azeotropes of methyl acetate-methanol and n-butyl acetate-n-butanol in the reaction system. It is extremely difficult to produce high-purity n-butyl acetate by transesterification of ester and n-butanol

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