对甲苯磺酸催化大豆油环氧化反应

Epoxidation of Soybean Oil with Toluene-p-Sulfonic Acid as Catalyst

以对甲苯磺酸(p-TsOH)为催化剂、乙二胺四乙酸二钠(EDTA-Na_2)为双氧水稳定剂,由甲酸和双氧水原位生成过甲酸对大豆油进行环氧化反应。考察了催化剂、甲酸溶液、双氧水和稳定剂用量以及反应温度和反应时间对产物环氧值的影响。实验结果表明,加入少量稳定剂可提高产物的环氧值;随催化剂和甲酸溶液用量的增加、反应温度的升高和反应时间的延长,产物环氧值呈现先增大后减小的趋势;随双氧水用量的增加,产物环氧值增大。大豆油环氧化反应的适宜条件为:大豆油用量100 g,88%(质量分数)的甲酸溶液用量6.5%(相对于大豆油的质量,下同),50%(质量分数)的双氧水用量47%,EDTA-Na_2用量0.006%,p-TsOH用量0.05%,反应温度70℃,反应时间8.0 h;在此条件下,环氧大豆油的环氧值为6.57,残余碘值为4.26。

Soybean oil was epoxidized by performic acid, which was obtained by in situ reaction of formic acid with hydrogen peroxide, with toluene-p-sulfonic acid （p-TsOH） as the catalyst and disodium ethylenediamine tetraacetate （EDTA-Na2 ） as the stabilizer of hydrogen peroxide. The effects of catalyst dosage, formic acid dosage, hydrogen peroxide dosage, stabilizer dosage,