Method for preparing 1, 3-butylene glycol by adopting fixed bed continuous reaction

Abstract

The invention discloses a method for preparing 1, 3-butylene glycol by adopting a fixed bed continuous reaction, and the preparation method comprises the following steps of: 1) feeding an acetaldehydeaqueous solution into a condensation reaction fixed bed reactor filled with a solid base catalyst by using carrier gas to obtain a condensation reaction product; 2) feeding the reaction material flowfrom which acetaldehyde is separated and a hydrogen flow into a hydrogenation reactor together, and carrying out hydrogenation reaction on 3-hydroxy butyraldehyde in the presence of a hydrogenation catalyst to generate 1, 3-butylene glycol; and 3) finally acquiring the 1, 3-butylene glycol product by separation and purification methods like vacuum rectification. According to the preparation method disclosed by the invention, a specific solid base catalyst is adopted, so that efficient condensation reaction of acetaldehyde is realized, and further the 1, 3-butylene glycol is prepared. The method is simple and efficient, particularly, the fixed bed reactor is combined with the specific catalyst, and the method is simple and convenient to operate, green, environment-friendly and few in industrial three wastes, and is a sustainable green synthesis route.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a method for preparing 1,3-butanediol by using a fixed-bed continuous reaction. Background technique [0002] 1,3-Butanediol (1,3-Butylene Glycol, 1,3-BDO) is a widely used chemical product, such as: 1,3-Butanediol and phthalic anhydride, maleic anhydride and other monomers The unsaturated polyester resin has good water resistance, softness and impact resistance; the plasticizer made of 1,3-butanediol has the advantages of low volatility, migration resistance and oil resistance. 1,3-Butanediol also has the characteristics of good hygroscopicity, odorless, low toxicity, and good water solubility. It can be used as a moisturizer and softener for textiles, tobacco and paper, and an antibacterial agent for cheese or meat; It is mainly used as a moisturizing agent in cosmetics, and has a good antibacterial effect, and can be used in the production of various lotions, ointments and t...

AI Technical Summary

Problems solved by technology

[0004] NaOH is corrosive and cannot be recycled. After the first step of the acetaldehyde condensation reaction is completed, it needs to use acetic acid to quench the reaction, which will generate saline wastewater; although the Raney nickel catalyst is stable in the hydrogenation reaction, after filtration or After centrifugation, it can be recycled, but in the tank reactor, due to the continuous collision and wear with the stirring blade, the particle size of Raney nickel will become smaller, resulting in difficulty in separation, and it is necessary to add a catalyst during use.

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