微量硫酸催化环氧大豆油的合成

Preparation of Epoxidized Soybean Oil by Catalysis of Small Amount of Sulfuric Acid

在无溶剂条件下,以甲酸为载氧体合成了环氧大豆油.通过正交实验确定了甲酸自催化合成环氧大豆油的优化工艺条件.为进一步提高环氧值和缩短反应时间,添加微量硫酸作为催化剂,并优化了其用量.结果表明,当大豆油、88%甲酸、30%双氧水和硫酸的质量比为1:0.13:0.7:0.004时,在65℃下反应3h,产品的环氧值为6.2%,残留碘值<6.0%.采用红外光谱和核磁共振对产品进行了表征.

Epoxidized soybean oil（ESO） was prepared with formic acid as oxygen carrier in a solvent-free system.The optimal production conditions of formic acid ESO were determined through orthogonal experiments.To further enhance the oxirane content and shorten reaction time,a small amount of sulfuric acid was added as catalyst.The results showed that when the mass ratio of soybean oil,formic acid,30% hydrogen peroxide and sulfuric acid was 1：0.13：0.7：0.004,the oxirane content of product was 6.2% and the residual iodine value（IV） less than 6.0% after 3 h reaction at 65 ℃.The FT-IR,~1H-NMR and ^（13）C-NMR spectra of the product were recorded in order to further characterize its chemical structure.