Method for synthesizing acetyl tributyl citrate by using ion type catalyst

Abstract

The invention relates to a method for synthesizing acetyl tributyl citrate through electrophoretic catalyst. The method comprises the steps: step one: citric acid, butanol and sodium bisulfate monohydrate are added into a reactor, and the catalyst is recycled and filtered after the cooling of the stirring reflux reaction, filtrate is neutralized by adding alkaline solution and rinsed till neutral state, then the butanol is distilled and recycled under normal pressure, and the residual water is steamed under reduced pressure to acquire crude tirbutyl citrate, and the compound decolurant of acticarbon and aluminum oxide is added into the crude tirbutyl citrat for decoloring treatment, thereby, the finished tirbutyl citrat is acquired; step two: the finished tirbutyl citrate, acetic anhydride and the sodium bisulfate monohydrate are added into the reactor, and the catalyst is filtered , cooled and recycled after 1.0-3.0 hours of stirring reaction under the temperature of 50-90 DEG C; filtrate is neutralized by adding alkaline solution and rinsed till neutral state; acetyl tributyl citrate is acquired after water phase is separated and n-butyl acetate is distilled under reduced pressure and recycled. The catalyst of the method of the invention is easily separated and recycled, the esterification process is not easily influenced by by-product, emulsification is not easy during the rinsing process and the product yield is high.

Description

technical field [0001] The invention relates to a method for synthesizing a non-toxic plasticizer, in particular to a method for synthesizing acetyl tributyl citrate with an ionic catalyst. It belongs to the field of fine chemical technology. Background technique [0002] At present, most commonly used plasticizers are phthalate plasticizers. Because they may induce cancer, foreign countries have legislated to restrict their use, and are actively looking for non-toxic plasticizers that can replace phthalates. Acetyl tributyl citrate is a promising non-toxic plasticizer, and the US Food and Drug Administration (FDA) considers it to be one of the safest plasticizers. Acetyl tributyl citrate has excellent cold resistance, light resistance and water resistance, good compatibility with polyvinyl chloride, polypropylene and various fiber resins, high plasticizing efficiency, non-toxic, low volatility, etc., especially in food Packaging, medical products, children's toys and othe...

AI Technical Summary

Problems solved by technology

The shortcoming of this method is that the recovery of catalyst is difficult, easy emulsification during dealcoholization and dehydration in tributyl citrate synthesis, product purification time is long; When acetyl tributyl citrate is synthesized, the by-product acetic acid that generates is unfavorable for esterification Carry out, the output rate of acetyl tributyl citrate is low, therefore needs to constantly remove acetic acid from reaction mixture, and operation is loaded down with trivial details and has increased production cost