Energy-saving method for preparing isopropyl acetate

Abstract

The invention belongs to the field of chemical reaction engineering and relates to a production method for isopropyl acetate, particularly an energy-saving process for preparing isopropyl acetate by reacting-distillation of methyl acetate and isopropanol. By taking methyl acetate and isopropanol as raw materials, the raw materials are prepared and recovered by reaction of a pressurized reaction rectifying tower and a normal pressure methyl acetate recovery tower, and the reaction of synthesizing isopropyl acetate in the pressurized reaction rectifying tower by virtue of a transesterification method is a pressurized reaction, so that the composition of a binary azeotrope formed by a reaction product methanol and the raw material methyl acetate is changed, the content of methyl acetate in the azeotrope is reduced, and the produced quantity at the tower top is reduced, and therefore, the equipment investment on the normal pressure methyl acetate recovery tower is reduced. The steam temperature of the binary azeotrope of methanol and methyl acetate in a rectifying section at the tower top of the pressurized reaction rectifying tower is enhanced, heat of a kettle reboiler is provided for the normal pressure methyl acetate recovery tower, and the pressurized reaction rectifying tower and the normal pressure methyl acetate recovery tower realize the purpose of saving energy and reducing consumption through heat integration.

Description

technical field [0001] The invention belongs to the field of chemical reaction engineering, and relates to a production method of ethyl isopropyl ester, in particular to an energy-saving process for preparing isopropyl acetate by reactive distillation of methyl acetate and isopropanol. Background technique [0002] Isopropyl acetate is an important carboxylate product, which is widely used; it is a raw material for synthetic resins and coatings, and can also be used as a component of certain perfumes, dehydrating agents, solvents for coatings, and 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, unde...

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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, and the product is complicated and difficult to separate. After the reaction, water of equimolar mass is produced, and the post-treatment process is relatively long; A kind of method is to adopt acetic acid and propylene to directly synthesize isopropyl acetate, as the method disclosed in CN102757341, this method has shortened the reaction process, saved the consumption of raw materials, and the direct esterification of acid and olefin is the acid of one molecule and one molecule Propylene reacts 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 makes the subsequent separation process difficult

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