Synthesis device and synthesis method of 1,3-butanediol

Abstract

The invention discloses a synthesis device and a synthesis method of 1,3-butanediol. An acetaldehyde aqueous solution is subjected to condensation reaction in a reaction rectification tower loaded with alkaline anion resin, acetaldehyde fractionated from the top of the tower is returned to a raw material tank for recycling, and 3-hydroxybutyraldehyde fractionated from a tower kettle directly enters a tower reactor for hydrogenation reaction; hydrogenation reaction of the 3-hydroxybutyraldehyde and hydrogen is carried out in the tower reactor, hydrogen at the top of the tower is recycled, and crude 1,3-butanediol obtained in the tower kettle enters a vacuum refining system; the crude product of 1,3-butanediol enters a light removal tower to remove light components, then enters a heavy removal tower, and the top of the tower obtains a 1,3-butanediol product with purity greater than 99.6% and no peculiar smell, and the method has the characteristics of short flow, low energy consumption,less pollution and continuous production.

Description

technical field [0001] The invention relates to the technical field of chemical reaction separation, in particular to a 1,3-butanediol synthesis device and synthesis method. Background technique [0002] 1,3-Butanediol has good hygroscopicity and water solubility, and is odorless and low-toxic, so it is widely used in cosmetics, medicines and high-end building materials. But at present, domestic 1,3-butanediol products are almost completely dependent on foreign imports, and the country has not had its own industrialized equipment. With the popularization of the scope of application of 1,3-butanediol, domestic research on 1,3-butanediol is also increasing. At present, the research on the synthesis route of 1,3-butanediol mostly uses acetaldehyde as the raw material. The specific route is to condense acetaldehyde to generate 3-hydroxybutyraldehyde, and then hydrogenate 3-hydroxybutyraldehyde to generate 1,3-butanediol. alcohol. This route is also the route for producing 1,3...

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Problems solved by technology

Chinese patent CN109422624A pointed out that the yield and purity of 1,3-butanediol prepared by the above-mentioned mainstream production process of 1,3-butanediol were not ideal, and had a pungent smell, so it was proposed to use a fixed-bed reactor and a loaded type Nickel hydrogenation catalyst to optimize the production process of 1,3-butanediol

Although the fixed bed reactor has less backmixing than the tank reactor, backmixing still exists and the process is complicated

In addition, the acetaldehyde condensation section in the above patents will produce a large amount of salt, which is difficult to handle

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