System and technology for rapid extraction of refined and pure ethyl acetate after pressurized esterification synthesis

Abstract

The invention discloses a system and technology for rapid extraction of refined and pure ethyl acetate after pressurized esterification synthesis. The system consists of a reactive rectification tower, a refining tower, a deacidification tower and a recovery tower, wherein the middle of the reactive rectification tower is connected to an acetic acid source and an ethanol source, the top of the reactive rectification tower is connected to the inlet of a first collection tank through a cooler, the first collection tank is also connected to a first stratification apparatus, and the top of the first stratification apparatus is communicated with the top of the reactive rectification tower and the middle of the refining tower respectively. The first stratification apparatus is communicated witha desalted water storage device, and desalted water can be supplemented into the first stratification apparatus. By supplementing desalted water into the first stratification apparatus, the substancecan serve as an extract for extraction of light components, reaction by-products and other impurities in crude ester, and also can accelerate the displacement of acetic acid in the crude ester and improve the qualified speed of products at the initial start-up stage of an ethyl acetate plant.

Description

technical field [0001] The invention relates to the field of acetic acid synthesis, in particular to a system and process for rapidly extracting pure ethyl acetate after pressurized esterification synthesis. Background technique [0002] Ethyl acetate, also known as ethyl acetate, is an important downstream product of acetic acid, with excellent solubility and quick drying. In the industry, it is mainly used as a solvent for the production of coatings (paints, nuclear enamel), adhesives, ethyl cellulose, artificial leather, linoleum colorants, and artificial fibers. It can also be used as an adhesive for the production of printing inks, artificial pearls, etc. . As an extractant, it is used in the production of medicine and organic acid products. In addition, it can also be used as a raw material for the production of pineapple, banana, strawberry and other fruit flavors, whiskey, cream and other spices. It has a wide range of uses and has a promising development prospect. ...

AI Technical Summary

Problems solved by technology

[0003] The acetic esterification method is the most common production method of ethyl acetate. In the presence of a catalyst, acetic acid and ethanol undergo an esterification reaction to form ethyl acetate. Ethyl acetate in my country is mainly produced by the acetic esterification method, and most of them use five towers. The rectification process requires a lot of equipment and high energy consumption; some ethyl acetate production processes use excessive ethanol to make the acetic acid react as completely as possible to omit the deacidification tower, but the crude ester prepared by this method contains a large amount of The content of ethanol and ethyl acetate is less, which leads to low purification efficiency of ethyl acetate, resulting in the problem of long production cycle of ethyl acetate

Also, the production process of ethyl acetate is to react in an esterification tank after mixing acetic acid, ethanol and a catalyst, and then transport the reacted material to a rectification tower for rectification. Since the reaction between acetic acid and ethanol is a reversible reaction, It is difficult to remove the water produced by the reaction in the esterification kettle in time, which is not conducive to the progress of the esterification reaction. The content of ethyl acetate in the reaction liquid is low, which is not conducive to the subsequent refining and purification process.

The traditional esterification method still has problems such as poor quality of ethyl acetate products, high raw material consumption, difficult deacidification and long production cycle of ethyl acetate.

Images