Continuous production device and method for isopropyl acetate

Abstract

The invention provides a continuous production device and a continuous production method for isopropyl acetate. The continuous production method for the isopropyl acetate comprises the following steps of: continuously feeding acetic acid and isopropanol in a reactor, and carrying out an esterification reaction under the catalysis of concentrated sulfuric acid to obtain a reaction mixture; feeding the reaction mixture to a reaction rectification tower; carrying out an esterification reaction and rectification when the liquid level exceeds 4 / 5; feeding one part of an obtained tower-bottom mixture to the reactor, returning the rest part of the obtained tower-bottom mixture to a reaction rectification tower, and keeping the circulation; carrying out condensation and phase separation onto the obtained tower-top mixture in sequence to obtain an isopropyl acetate crude product; feeding the isopropyl acetate crude product to a finished product rectification tower for carrying out rectification and condensation to obtain an isopropyl acetate finished product. The continuous production method for the isopropyl acetate can be used for obviously increasing the front esterification reaction time, so that the ternary azeotropy of reaction rectification tower-top isopropanol, isopropyl acetate and water is relatively stable; the layered interface in the phase slitter is clear, so that the generated water can be automatically separated out, and therefore, a qualified product is obtained in thousand-ton level production.

Description

technical field [0001] The invention relates to the technical field of isopropyl acetate production, in particular to a continuous production device and method for isopropyl acetate. Background technique [0002] Isopropyl acetate, also known as isopropyl acetate, has a simplified structural formula of CH 3 COOCH (CH 3 ) 2 . Isopropyl acetate is a colorless and transparent liquid with a fruity aroma. It can be miscible with various organic solvents such as alcohols, ketones and ethers. It can be used in industrial fields such as coatings, plastics, spices, medicine and pesticides, and has a wide range of applications. . At present, the production method of isopropyl acetate generally adopted in industry is to take acetic acid and isopropanol as raw materials, and take sulfuric acid as catalyst esterification to make. [0003] There are generally two ways for the synthesis process of the above-mentioned esterification. One is a batch method, that is, acetic acid and isop...

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Problems solved by technology

[0003] There are generally two ways for the synthesis process of the above-mentioned esterification. One is a batch method, that is, acetic acid and isopropanol react under the action of concentrated sulfuric acid, and then through neutralization, dehydration and rectification, the finished product is obtained. However, the batch method Due to the limitation of reaction balance, the conversion rate of raw materials is not high, and the reaction time is long, which is not conducive to industrial production; the other is continuous production using reactive distillation or reactive distillation, such as the continuous production disclosed in Chinese patent literature with application number 02111177.4 A method and device for preparing isopropyl acetate by esterification reaction. In the pre-reaction zone at the bottom of the reaction distillation column of the device, a certain amount of glacial acetic acid, isopropanol and an acidic substance catalyst are heated and reacted. The glacial acetic acid and isopropyl acetate The proportion of propanol is glacial acetic acid:isopropanol=(1.2~10):1 (molar ratio), the content of the acidic substance catalyst is 0.01~1% (weight); the substances in the pre-reaction zone are continuously extracted, And return from the middle and upper part of the reactive rectification column for circulation; glacial acetic acid is continuously added to the reaction system from the middle part of the reactive rectification column, and isopropanol is continuously added into the reaction system from the pre-reaction area, and is continuously extracted in the rectification tower after reaction and rectification Isopropyl acetate finished product

[0004] Compared with the batch method, the method for preparing isopropyl acetate by the above-mentioned continuous method esterification is more suitable for industrialized production, but, in the large-scale industrial production of 10,000 tons, the method for preparing isopropyl acetate by the above-mentioned continuous method esterification When preparing isopropyl acetate, the layers of the phase separator are unclear, and the water generated by the reaction cannot be separated automatically, resulting in the failure to obtain qualified isopropyl acetate products

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