摘要
在无溶剂无羧酸条件下,以四丁基溴化铵为相转移催化剂,用65%的叔丁基过氧化氢(TBHP)为氧源直接合成环氧大豆油。考察了反应温度、反应时间、催化剂用量及TBHP与碳碳双键摩尔比对环氧化反应的影响,通过红外光谱对催化环氧化的机理进行了初步探究。结果表明:在反应温度65℃、反应时间3 h、催化剂用量3.0 g(10.0 g大豆油)、TBHP与碳碳双键摩尔比1.5∶1条件下,催化环氧化效果最好,环氧值、转化率和选择性分别达到3.5%、53.9%和77.5%。此方法操作简单,催化剂价格低,简化了工艺流程,降低了工艺成本,同时克服了传统方法使用羧酸和溶剂等造成的弊端。
In the absence of solvent and carboxylic acid, epoxy soybean oil was synthesized with tetrabu- tylammonium bromide as phase transfer catalyst and TBHP (65%) as oxygen source. The effects of reac- tion time, reaction temperature, dosage of catalyst and molar ratio of TBHP to carbon - carbon double bond on the epoxy reaction were investigated, and the reaction mechanism was analyzed by FrlR. The results showed that the optimal reaction conditions were obtained as follows: reaction temperature 65 ℃, reaction time 3 h, dosage of catalyst 3.0 g(soybean oil mass 10.0 g) , molar ratio of TBHP to carbon - carbon double bond 1.5: 1. Under the optimal conditions, the catalytic epoxy result was the best, and the epoxy value of the product, conversion and selectivity could reach 3.5% , 53.9% and 77.5%, respec- tively. The method had the items of simply process, easy operation and low cost, and it overcame the drawbacks of the traditional methods of using carboxylic acids and so/vents.
作者
蒲吉运
杨小俊
白航
李富
PU Jiyun, YANG Xiaojun, BAI Hang, LI Fu(Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205 ,Chin)
出处
《中国油脂》
CAS
CSCD
北大核心
2018年第3期110-112,140,共4页
China Oils and Fats
基金
湖北省自然科学基金重点类项目(2016CFA079)
广东省公益研究与能力建设专项(2015A010105018)
关键词
无溶剂
四丁基溴化铵
叔丁基过氧化氢
环氧大豆油
solvent free
tetrabutylammonium bromide
tert - butyl hydroperoxide
epoxy soybean oil