29671-83-8Relevant academic research and scientific papers
METHOD FOR PREPARING ALKYL HYDROXYL ACID ESTER AND USE THEREOF
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Page/Page column 7; 8, (2021/09/17)
Provided is a method for preparing an alkyl hydroxyl acid ester, the product and use thereof. The method has advantages of high yield, not producing waste water, gas, or solid, low cost, and is green and environment friendly.
Preparation method and application of hydroxy acid alkyl ester
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Paragraph 0040-0045, (2020/06/16)
The invention relates to a preparation method of a green solvent hydroxy acid alkyl ester, which comprises the following steps: (1) an alkyl alcohol and a hydroxy acid methyl ester or an ethyl ester are mixed under normal pressure or micro-positive pressure in the presence of a catalyst and reacted at the temperature of 50-200 DEG C, and the molar ratio of alkyl alcohol to the hydroxy acid methylester or ethyl ester is greater than 1; (2) at the temperature of 135-170 DEG C, a product methanol or ethanol is fractionated for the first time, and the top temperature of a fractionating column isthe boiling point temperature of methanol or ethanol; (3) atmospheric pressure or reduced pressure distillation is carried out for the second time to obtain redundant reactants alkyl alcohol and unreacted hydroxy acid methyl ester or ethyl ester, and the distillation temperature is controlled to be the boiling point temperature of the alkyl alcohol and the hydroxy acid methyl ester or ethyl ester;and (4) the remaining product hydroxy acid alkyl ester is collected. The method has the advantages of high yield, no generation of any three wastes, low production cost, greenness and environmental protection.
