氢氧化钾/活性炭催化邻苯二酚与碳酸二乙酯反应合成邻苯二乙醚  

SYNTHESIS OF 1,2-DIETHOXYBENZENE FROM CATECHOL AND DIETHYL CARBONATE OVER KOH/AC

作　　者：李军奇[1] 柳娜[1] 薛冰[1] 李永昕[1] 

机构地区：[1]江苏工业学院化学化工学院,江苏常州213164

出　　处：《精细石油化工》2009年第4期1-4,共4页Speciality Petrochemicals

基　　金：江苏省高技术研究项目(BG2006015);江苏省高校重大基础研究项目(06KJA5013)

摘　　要：实验以邻苯二酚与碳酸二乙酯(DEC)为原料,在液相条件下,以KOH/AC固体碱为催化剂,合成了邻苯二乙醚。研究了邻苯二酚与碳酸二乙酯氧烷基化合成邻苯二乙醚的反应,考察了反应温度、反应时间、催化剂用量、原料摩尔配比等因素对反应结果的影响,并采用CO2程序升温脱附(CO2 H-TPD)对催化剂进行了表征。实验结果表明,当KOH的负载量为20%时,催化剂具有最好的催化性能,催化剂的弱碱性位是催化反应的活性中心。在反应温度为200℃,反应时间为3 h,催化剂用量为反应物总质量的5%,n(DEC):n(邻苯二酚)=4:1的条件下,邻苯二酚的转化率和邻苯二乙醚的选择性分别达到100%和87.7%。O-ethylation of catechol with diethyl carbonate（DEC） in liquid phase was performed to synthesize 1,2-diethoxybenzene over KOH/AC. The effects of reaction temperature, reaction time, catalyst dosage and molar ratios were investigated. Catalysts were characterized by CO2 temperature-programmed desorption （CO2-TPD）. The results indicated that the weakly basic sites of KOH/AC were the active sites for the O-ethylation of catechol with diethyl carbonate. KOH/AC with 20M KOH loading had the highest catalytic activity. Under the optimum conditions, i. e. , reaction temperature 200℃, time 3 h, n（DEC） ： n（Catechol ） 4 ： 1 and catalyst dosage 5%, catechol conversion and the selectivity for 1, 2-diethoxybenzene reached 100% and 87.7%, respectively.

关 键 词：邻苯二酚 碳酸二乙酯 邻苯二乙醚 氢氧化钾/活性炭 

分 类 号：TQ243.2[化学工程—有机化工]