摘要
以阳离子交换树脂(NKC-9)为催化剂,特戊酸和乙醇为原料,采用分子筛吸附脱水技术对合成特戊酸乙酯进行了研究。考察了原料配比、催化剂用量和反应时间等因素对反应过程的影响,分别测定了50℃,60℃和70℃下的反应速度常数。通过实验得到了酯化反应工艺条件:n(乙醇)∶n(特戊酸)=1.3∶1,NKC-9的用量为乙醇和特戊酸总质量的10.0%,反应温度≤100℃,反应时间4.0h,在该条件下特戊酸的转化率达到94.3%。催化剂重复使用15次,特戊酸的转化率仍然可达到94.1%。该反应为二级反应,表观活化能为71.31kJ/mol。
Synthesis of ethyl pivalate from pivalic acid and ethanol with cation exchange resin（NKC-9） as catalyst and 3A molecular sieve as water removal agent was studied. The effects of reaction conditions, such as mole ratio of ethanol to pivalic acid, catalyst dosage and reaction time were examined. The optimum reaction conditions were found as： mole ratio,n（ethanol）：n（pivalic acid） = 1.3： 1 ; NKC - 9 catalyst dosage, 10.0% （mass of catalyst relative to total mass of pivalic acid and ethanol） ;reaction temperature, ≤100℃;reaction time,4.0h. Conversion of pivalic acid by the process achieves 94.3%, and activity of catalyst can be maintained at 94. 1% conversion after being used 15 times. The kinetics, such as the rate constant at 50℃, 60 ℃ and 70℃, reaction order and apparent activation energy et al, were examined. The results showed that the synthesis of ethyl pivalate is a second- order reaction, and the apparent activation energy is 71.31 kJ/mol based upon NKC -9 catalyst.
出处
《日用化学工业》
CAS
CSCD
北大核心
2009年第3期183-186,共4页
China Surfactant Detergent & Cosmetics
关键词
特戊酸乙酯
阳离子交换树脂
沸石分子筛
吸附脱水
动力学
酯化
ethyl pivalate
cation exchange resin
molecular sieve
adsorptive water removal
kinetics
esterification
