K_2CO_3/NaY催化苯酚与碳酸二乙酯合成苯乙醚  

Synthesis of Phenetole by Ethylation of Phenol with Diethyl Carbonate over K_2CO_3/NaY Catalyst

作　　者：李永昕[1] 孙秀红[1] 柳娜[1] 薛冰[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：《石油化工》2009年第5期531-535,共5页Petrochemical Technology

基　　金：国家重大基础研究前期研究项目(2003CCA03200);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：以负载型固体碱K2CO3/NaY为催化剂、碳酸二乙酯(DEC)为乙基化试剂,催化苯酚与DEC进行液相乙基化反应合成苯乙醚。采用Hammett指示剂法和X射线衍射技术对K2CO3/NaY催化剂进行表征。实验结果表明,催化剂上的弱碱中心(7.2<H-<9.3,H-表示碱强度)是催化剂的活性中心,且随K2CO3负载量的增加,催化剂的碱量增大,碱强度增强。当K2CO3负载量(质量分数)为25%时,K2CO3/NaY催化剂对该合成反应的活性最高。考察了反应温度、催化剂用量、原料配比、反应时间对合成反应的影响,得到适宜的反应条件为:反应温度150℃、催化剂质量占原料总质量的4%、n(DEC):n(苯酚)=1.5、反应时间150min。在此条件下,苯酚的转化率为99.5%,苯乙醚的选择性为97.8%。Synthesis of phenetole by ethylation of phenol with diethyl carbonate （DEC） as an alkylating agent in liquid phase was studied and K2CO3/NaY was used as catalyst. The solid base catalyst was characterized by means of Hammett indicator method and XRD. The weak basic sites （7.2 〈 H∞ 〈 9.3, H∞ was designated as basicity） were active in the ethylation. The amount of basic sites increased with increasing of K2CO3 loading amount. When K2CO3 loading amount （ mass fraction based on mass of K2CO3/NaY catalyst） was 25%, the activity of the catalyst was the highest. Further increase of K2CO3 loading amount contrarily caused the decrease of basic sites due to blockage of the catalyst pores. Effects of reaction temperature, catalyst dosage, mole ratio of reactants and reaction time on catalytic activity were also studied. Under optimal reaction conditions： reaction temperature 150 ℃, catalyst mass fraction （based on total mass of the system） 4%, n（DEC） ： n（phenol） 1.5, reaction time 150 min, conversion of phenol and selectivity to phenetole were 99.5% and 97.8%, respectively.

关 键 词：碳酸钾 NAY分子筛 催化剂 碳酸二乙酯 苯酚 乙基化 苯乙醚 

分 类 号：TQ032.4[化学工程]