摘要
以沙柳为原料,硫酸为催化剂,考察了催化剂浓度、反应时间、反应温度、液固比对沙柳水解制备乙酰丙酸得率的影响,通过正交实验方法得到最佳的水解反应条件为:反应温度200℃,反应时间90 min,催化剂质量分数9%,液固比(mL∶g)15∶1,乙酰丙酸的最高得率为18.80%;各因素对水解反应影响的大小顺序为:反应时间>催化剂浓度>反应温度>液固比。在静态条件下,用335弱碱性阴离子交换树脂对水解液进行分离提纯,在附吸温度为35℃、树脂投料量为15 g、盐酸洗脱剂浓度为0.5 mol/L时,乙酰丙酸的回收率为95.35%。
Preparation of levulinic acid from hydrolysis of Salix psammophila catalyzed by sulfuric acid as catalyst was studied in this paper. The effects of catalyst concentration,reaction time,reaction temperature,liquid-solid ratio on the yield of levulinic acid were investigated. By orthogonal tests,the optimum hydrolysis reaction conditions were as follows：reaction temperature 200℃,reaction time 90 min,catalyst concentration 9%,liquid-solid ratio（mL∶g） 15∶1,the highest yield of levulinic acid was 18.80%,the order of the factors was obtained according to the degree to which they could affect hydrolysis reaction as follows：reaction time ＆gt; catalytic concentration ＆gt; reaction temperature ＆gt; liquid-solid ratio. 335 weak basic anion-exchange resin was used for separation and purification of hydrolysis mixed solution,under the static conditions of adsorption temperature 35 ℃,amount of resin 15 g,eluent concentration（HCl） 0.5 mol/L,recovery of levulinic acid was 95.35%.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2014年第1期242-246,共5页
Chemical Industry and Engineering Progress
基金
内蒙古自治区自然科学基金项目(2013MS0721)
关键词
沙柳
乙酰丙酸
阴离子交换树脂
正交实验
分离提纯
Salix psammophila
levulinic acid
anion-exchange resin
orthogonal tests
separation and purification
