Method for preparing isopropyl acetate through rectification

Abstract

The invention belongs to the field of chemical reaction engineering and relates to a method for producing isopropyl acetate, in particular to a method for preparing isopropyl acetate through rectification and reaction between methyl acetate and isopropyl alcohol. By utilizing a reactive distillation column and a methyl acetate recovery tower, the isopropyl acetate is prepared and the raw material methyl acetate is recycled under normal pressure, the reactant isopropyl alcohol of high boiling point is fed into the upper portion of a reaction zone located in the middle portion of the reactive distillation column, the mixture of methyl acetate and methyl alcohol which are low in boiling point are fed into the lower portion of the reaction zone located in the middle portion of the reactive distillation column, it is guaranteed that the concentration of the methyl acetate in the liquid phase in the lower portion of the reaction zone is kept high, the concentration of the isopropyl alcohol in the liquid phase in the upper portion of the reaction zone is high, so that the concentration of the two reactants on a column plate in the whole reaction zone is kept high comparatively, meanwhile, products, namely the methyl alcohol and the methyl acetate, form the minimum azeotrope and are removed from the column top, the product, namely the isopropyl acetate, of higher boiling point is removed from the column bottom through a stripping section, and therefore the reaction equilibria can move rightward faster.

Description

technical field [0001] The invention belongs to the field of chemical reaction engineering, and relates to a production method of isopropyl ethyl ester, in particular to a method for preparing isopropyl acetate by reactive distillation of methyl acetate and isopropanol. Background technique [0002] Isopropyl acetate is an important carboxylate product, it is widely used, it is a raw material for synthetic resins and coatings, it can also be used as some fragrance components, dehydrating agents, solvents for coatings, solvents for printing inks , and can be used as an extractant in some pharmaceutical synthesis processes. Isopropyl acetate is known as a "universal solvent" and can be miscible with organic solvents such as alcohols, ketones, and ethers. [0003] There are mainly two kinds of production techniques for synthesizing isopropyl acetate at present, and a kind of method is exactly that acetic acid and isopropanol are raw materials, under the effect of strong acid ca...

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Problems solved by technology

[0003] There are mainly two kinds of production techniques for synthesizing isopropyl acetate at present, and a kind of method is exactly that acetic acid and isopropanol are raw materials, under the effect of strong acid catalyst direct esterification generates isopropyl acetate, as the method disclosed in CN103214367, this The method uses concentrated sulfuric acid as a catalyst, because the catalyst is easy to get and the price is low, but its main disadvantages are that the device is easy to corrode, easy to pollute the environment, the product is complicated and difficult to separate, and water of equimolar mass is produced after the reaction, and the post-treatment process is relatively long; One method is to adopt acetic acid and propylene to directly synthesize isopropyl acetate, such as the method disclosed in CN102757341, this path shortens the flow process and saves the consumption of raw materials. The direct esterification of acid and olefin is the acid of one molecule and one molecule of propylene A reaction occurs to generate a molecule of isopropyl acetate, and no other by-products are produced in the reaction, but this process also has shortcomings. Oligomers of olefins will accumulate during the reaction, which will cause difficulties in the subsequent separation process

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