Green Process for o-Cersol Carboxylation Using Potassium Phosphate Base

Chinese Journal of Applied Chemistry

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Green Process for o-Cersol Carboxylation Using Potassium Phosphate Base

WU Linjuan, ZHU Dajian, XIAO Se, LEI Yizhu, GUO Yuanyuan, ZHANG Panpan, LI Guangxing^*

School of Chemistry & Chemical Engineering,Huazhong University of Science & Technology,Wuhan 430074,China

Received:2014-10-09 Published:2015-06-10 Online:2015-06-10
Contact: LI Guangxing, professor; Tel/Fax:027-87543032; E-mail:ligxabc@163.com; Research interests:industrial catalysis, C1 chemistry engineering
Supported by:
Supported by the 863 Program of Ministry of Science and Technology of China(No.NC2010MA0137)

Abstract

Abstract: A green process of the carboxylation reaction of o-cresol with CO₂ using K₃PO₄ as a base was studied for the synthesis of 2-hydroxy-3-methylbenzoic acid(o-MSA) and related carboxylated products. Various reaction parameters such as temperature, pressure, and the ratio of the base to substrate had been tested. The results show that 95.4% total yield of all carboxylated products in this Koble-Schmitt reaction is obtained using K₃PO₄ as a base under 3.0 MPa CO₂ and 150 ℃. Additionally, no CO₂ is released during the neutralization process following the Koble-Schmitt reaction and the K₃PO₄ can be recovered and recycled by neutralization of KH₂PO₄ with KOH. Therefore, this process allows a green fixation of CO₂.

Key words: carbon dioxide, potassium phosphate, hydroxy-methylbenzoic acid, green synthesis, o-cersol

WU Linjuan, ZHU Dajian, XIAO Se, LEI Yizhu, GUO Yuanyuan, ZHANG Panpan, LI Guangxing. Green Process for o-Cersol Carboxylation Using Potassium Phosphate Base[J]. Chinese Journal of Applied Chemistry.

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Green Process for o-Cersol Carboxylation Using Potassium Phosphate Base

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