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| Synthesis of unsaturated wax esters by non-catalytic esterification and its separation and purification |
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| DOI： |
| KeyWord:wax ester non-catalytic esterification separation and purification |
| FundProject:国家自然科学基金项目（31772003） |
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| Abstract: |
| Unsaturated wax esters are widely used in food, cosmetics and pharmaceutical products. The synthesis of unsaturated wax ester (cetyl oleate) by direct esterification of oleic acid and hexadecanol without catalysis was studied. The optimal synthesis conditions were obtained by single factor experiment as follows: reaction temperature 180 ℃, reaction time 8 h, molar ratio of oleic acid to hexadecanol 1.5∶ 1. Under these conditions, the conversion rate of hexadecanol reached 99.1% and the yield of the wax ester was 98.1%. The solvent extraction method was used to purify the crude wax ester products, and the extraction process was optimized by single factor experiment as follows: methanol used as the solvent, extraction temperature 20 ℃, ratio of methanol to crude products 4∶ 1, extraction time 0.5 h and extraction times 5. Under these conditions, the yield of cetyl oleate was 92.0%, the purity reached 98.7%, and the acid value was 2.7 mgKOH/g, which met the requirements of United States Pharmacopoeia with acid value below 3 mgKOH/g. |
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