Page 120 - 《精细化工》2021年第1期
P. 120
第 38 卷第 1 期 精 细 化 工 Vol.38, No.1
202 1 年 1 月 FINE CHEMICALS Jan. 2021
催化与分离提纯技术
氧化苯乙烯加氢体系中竞争反应的影响因素
*
刘 毅,吴洪键,刘义云,尹燕波,赖伟坤,连奕新
(厦门大学 化学化工学院,醇醚酯化工清洁生产国家工程实验室,福建 厦门 361102)
摘要:以氧化苯乙烯为原料,通过催化加氢制得 2-苯乙醇。考察了不同活性金属、活性金属负载量、载体及反
应条件对氧化苯乙烯催化加氢存在的竞争反应的影响;选择 Pd/Al 2 O 3 、Ni/Al 2 O 3 、Pt/Al 2 O 3 、Pd/MgO-Al 2 O 3 和
Pd/AC(活性炭)催化体系为研究对象,采用 XRD、H 2 -TPD、BET、XPS 和催化剂评价方法探究了催化剂与竞
争反应的关联性。研究发现,在 Pd 基催化体系中,提高反应温度可以促进氧化苯乙烯加氢反应进行,但是过高
温度更有利于异构化生成苯乙醛并进一步发生缩合反应。结果表明,以 Pd 0.5 /MgO-Al 2 O 3 (Pd 含量为 Al 2 O 3 载体
质量的 0.5%)为催化加氢体系,当反应温度为 150 ℃时,氧化苯乙烯转化率为 93%,2-苯乙醇选择性大于 85%,
而苯乙醛及其缩合物选择性小于 15%。
关键词:竞争反应;氧化苯乙烯;苯乙醛;2-苯乙醇;催化技术
中图分类号:TQ20;TQ651 文献标识码:A 文章编号:1003-5214 (2021) 01-0110-09
Influential factors of competitive reaction in hydrogenation
system of styreneoxide
*
LIU Yi, WU Hongjian, LIU Yiyun, YIN Yanbo, LAI Weikun, LIAN Yixin
(College of Chemistry and Chemical Engineering, National Engineering Laboratory for Green Chemical Productions
of Alcohol-Ethers-Esters, Xiamen University, Xiamen 361102, Fujian, China)
Abstract: 2-Phenylethanol was prepared from styrene oxide by catalytic hydrogenation.The effects of
different active metals,active metal loads, carriers and reaction conditions on the competitive reaction of
catalytic hydrogenation of styrene oxide were investigated. Pd/Al 2O 3, Ni/Al 2O 3, Pt/Al 2O 3, Pd/MgO-Al 2O 3
and Pd/AC catalytic systems were used as the research objects. The correlation between catalysts and
competitive reactions was explored was XRD, H 2-TPD, BET, XPS and catalytic evaluation method. The
results showed that in Pd catalytic system, enhancing reaction temperature could promote the hydrogenation
of styrene oxide, but excessive temperature was more favorable for isomerization into phenylacetaldehyde and
further condensation reaction. It was found that when Pd 0.5/MgO-Al 2O 3 (Pd content was 0.5% of the mass of
Al 2O 3 carrier) was used as catalyst and reaction temperature was 150 ℃, the conversion rate of styrene
oxide was 93%, the selectivity of 2-phenylethanol was over 85%, and the selectivity of phenylacetaldehyde
and its condensation products was less than 15%.
Key words: competition reaction; styrene oxide; phenylacetaldehyde; 2-phenylethanol; catalysis technology
[1]
2-苯乙醇是从玫瑰花瓣提取精油的主要成分 , 有腐蚀性,需要昂贵的耐腐蚀设备,容易导致环境
[1]
可用于加香剂和制备化学中间体。2-苯乙醇也可通 问题及产物与催化剂难以分离 。
过化学法制备,如苯乙酸乙酯加氢法 [2-3] 、Grignard 氧化苯乙烯加氢制备 2-苯乙醇具有原子利用率
[4]
试剂合成法 。工业上通常采用苯和环氧乙烷在氯 高,产物易分离,纯度高,环境污染小等优点,该
[5]
化铝存在下通过 Friedel-Crafts 烷基化反应制备 , 方法是目前国内外研究的主要方向,在工业生产中
但该反应存在一个巨大的缺点,即采用的催化剂具 的占比逐渐提高 [6-8] 。相关报道中常用催化剂活性金
收稿日期:2020-07-06; 定用日期:2020-08-14; DOI: 10.13550/j.jxhg.20200597
作者简介:刘 毅(1996—),女,硕士生,E-mail:liuyixmustu@163.com。联系人:连奕新(1971—),男,高级工程师,E-mail:
lianyx@xmu.edu.cn。