摘要
以Bronsted酸性离子液体[HMIm]HSO4为催化剂,研究了醋酸棉酚的合成工艺,主要考察了反应时间、反应温度、物料比、催化剂用量对醋酸棉酚酯化率的影响。得到的最佳反应条件为:反应温度10℃,棉酚溶液与冰醋酸-[HMIm]HSO4混合液的体积比1∶1.0,催化剂用量为冰醋酸质量的6%,反应时间4 h。该条件下酯化率可达93%。通过热重分析和紫外光谱仪检测方法对离子液体[HMIm]HSO4进行了稳定性和酸性的分析,考察了离子液体的回收利用性,[HMIm]HSO4循环使用4次后催化活性几乎不变。
With Bronsted acidic ionic liquid [ HMIm] HSO4 as the catalyst, the synthesis of gossypol acetic acid was investigated. The effects of reacting conditions including temperature, reaction time, material ratio and amount of catalyst on the yield of the reaction were also investigated. The optimal reaction conditions were as follows： reaction temperature 10%, volume ratio of gossypol to glacial acetic acid- [ HMIm] HSO4 1： 1.0, amount of catalyst 6% （based on the mass of glacial acetic acid）, reaction time 4 h. Under these conditions, the yield of gossypol acetic acid reached 93 %. At the same time, the stability and acidity of ionic liquid （ [ HMIm ] HSO4 ） were investigated using thermogravimetric analysis and UV spectroscopy detection. The ionic liquid [ HMIm ] HSO4 had a stable catalytic activity even after 4 cycling.
出处
《中国油脂》
CAS
CSCD
北大核心
2012年第1期37-40,共4页
China Oils and Fats
基金
兵团博士基金项目(2010JC13)
关键词
离子液体
醋酸棉酚
催化
酯化反应
ionic liquid
gossypol acetic acid
catalysis
esterification
