Method for preparing tributyl citrate by taking macroporous strong-acid cation exchange resin as catalyst

Abstract

The invention discloses a method for preparing tributyl citrate by taking macroporous strong-acid cation exchange resin as a catalyst, belonging to a preparation method of tributyl citrate. The method comprises the steps of: reacting citric acid with n-butanol in the presence of macroporous strong-acid cation exchange resin (NKC-9) serving as a catalyst; filtering to remove the catalyst after the reaction reaches the end point; and neutralizing, rinsing, distilling and purifying the product to obtain the tributyl citrate. The separated catalyst can be recycled, and the activity is basically unchanged. By taking the reactant n-butanol as a water-carrying agent, the environmental pollution due to the use of organic solvents such as toxic benzene, methylbenzene and the like can be avoided, and the aftertreatment is convenient; the method has the advantages of mild reaction conditions, short reaction time, no environment pollution and the like.

Description

Technical field [0001] The invention relates to a method for preparing tributyl citrate, in particular to a method for preparing tributyl citrate by using a macroporous strong acid cation exchange resin as a catalyst. Background technique [0002] Tributyl citrate has excellent characteristics such as non-toxic and odorless, cold resistance, light resistance, water resistance, flame retardancy, low volatility, good biodegradability, and high plasticizing efficiency. It is considered by the FDA to be the safest plasticizer One of them, and was approved by the FDA as a green plasticizer, making it widely used in food packaging, beverage bottle stoppers, medical supplies, children's toys, personal hygiene products, and national defense projects. It is also an important chemical intermediate . [0003] Tributyl citrate is usually synthesized from citric acid and n-butanol under certain process conditions under the action of a catalyst. The traditional catalyst is mostly concentrated ...

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Problems solved by technology

[0004] At present, there have been reports in China on the preparation of tributyl citrate from organic acids, solid super acids, phosphotungstic acid, loaded phosphotungstic acid, silicotungstic acid, ionic liquids, mesoporous molecular sieves, microwave radiation, etc., but there are various degrees of pollution. The disadvantages of using water-carrying agents are corrosion to equipment, inconvenient operation, high cost, large investment costs, and difficulty in industrial implementation.

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