Optimization of preparation process of epoxy cottonseed oil and its downstream products study
In order to provide theoretical basis and technical support for the preparation and high value-added utilization of epoxy cottonseed oil,cottonseed oil was epoxidized by inorganic acid catalysis and organic acid autocatalysis.The catalytic effect of different acids on the epoxidation reaction and the influence of emulsifiers on the epoxidation process were investigated.Hydroxylated cottonseed oil was prepared using epoxy cottonseed oil as raw material by open-loop one pot synthesis method,and then esterified with adipic acid to synthesize cottonseed oil polyester.The product was characterized by Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance.The results showed that concentrated sulfuric acid had the best catalytic effect on the epoxidation of cottonseed oil,followed by phosphoric acid in inorganic,and formic acid in organic acids had the best effect.Emulsifiers increased the uniform mixing of the oil-water reaction system and appropriately increased the epoxy value of the product.However,an additional step of demulsification was not suitable for quantitative production.Cottonseed oil polyester had ester groups,but still had unesterified hydroxyl groups.In conclusion,quantitative production of epoxy cottonseed oil can prioritize formic acid as a catalyst,and hydroxylated cottonseed oil prepared by epoxy cottonseed oil can react with polyacids to prepare cottonseed oil polyester,but there are still unesterified hydroxyl groups.
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