K2CO3-catalyzed direct synthesis of salicylic acid from phenol and supercritical CO2

被引：76

作者：

Iijima, Takayuki ^{[1
]}

Yamaguchi, Tatsuaki ^{[1
]}

机构：

[1] Chiba Inst Technol, Dept Life & Environm Sci, Fac Engn, Chiba 2750016, Japan

来源：

APPLIED CATALYSIS A-GENERAL | 2008年 / 345卷 / 01期

关键词：

supercritical carbon dioxide; carboxylation; regioselective; phenol; base catalyst;

D O I：

10.1016/j.apcata.2008.03.037

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The synthesis of salicylic acid from phenol and CO2 was studied in the presence of various base catalysts. Among the catalysts investigated, potassium carbonate was found to be the most active. The formation of p-hydroxybenzoic acid, as a by-product, was negligibly small. Salicylic acid selectivity is 99% or more in all cases. Under optimized conditions, the salicylic acid yield could reach 68.3% at a phenol conversion of 69.3%. Several parameters were studied, i.e., catalyst usage, reaction temperature and time, and CO2 pressure. Based on experimental observations, a possible reaction mechanism for the present K2CO3 -catalyzed direct synthesis of salicylic acid is proposed. (C) 2008 Published by Elsevier B.V.

引用

页码：12 / 17

页数：6

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