Method for preparing salicylate through green synthesis process

Abstract

The invention discloses a method for preparing salicylate through a green synthesis process. The method comprises the following steps: carrying out ester exchange on salicylate compounds and isophorone which are used as raw materials under the catalysis of a potassium carbonate weak base catalyst, directly conducting filtering after the ester exchange is finished, directly applying the obtained weak base catalyst to the next batch of reaction, and directly rectifying and purifying the obtained filtrate to obtain the salicylate, thereby obtaining a finished homosalate product meeting requirements. After the process is used for improving an original process, the whole system does not generate waste water and waste residues any more, so corresponding cost for treating the waste water and thewaste residues is saved, raw material cost is correspondingly saved due to continuous application of the catalyst, the product has a cost advantage, and the current demand for a green and environment-friendly process is better met.

Description

technical field [0001] The present invention relates to the field of chemical engineering, in particular to a preparation method of salicylic acid esters with a green synthesis process. Background technique [0002] Original film loose ester (HMS), CAS number: 118-56-9, molecular formula: C 16 h 22 o 3 , molecular weight: 262.34. This product is a colorless to light yellow oily liquid with a density of 1.05g / cm 3 , boiling point 141-165°C (12torr), refractive index 1.516-1.519, flash point 132.3°C, water solubility <0.1g / 100ml (26°C). [0003] The original film loose ester has good compatibility with resin and is not colored. It is widely used in plastics such as soft and rigid polyvinyl chloride and coatings such as nitrocellulose, acrylic resin and polyurethane as a light stabilizer; it is irritating to the skin. It is very small and can be added to high-end cosmetics as a sunscreen agent. As an important daily chemical product, it is often found in the formulation...

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Problems solved by technology

[0004] There are few reports about the synthesis of protofilm loose esters, and the existing preparation methods mainly exist in the following ways: salicylic acid and isophorol are directly esterified and synthesized. After the reaction, a large amount of water washing is required to remove the catalyst. A large amount of waste water and waste salt need to be treated; salicylates and isophorol are synthesized by transesterification under the catalysis of alkali metals. This method also requires a large amount of water washing to remove the catalyst after the reaction, resulting in a large amount of waste water and Waste salt needs to be treated

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