Synthesis of mono-4-hydroxybenzoic acid ethylene glycol ester catalyzed by p-toluene sulfonic acid under microwave radiation

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Title: Synthesis of mono-4-hydroxybenzoic acid ethylene glycol ester catalyzed by p-toluene sulfonic acid under microwave radiation

DOI: 10.3969/j.issn.1008-1143.2012.09.013

Authors: Yang Xiaojun, Feng Xiaoli, Zhang Mouzhen

Keywords:Fine Chemical Engineering; Microwave Irradiation of P-Toluenesulfonic Acid; -P-hydroxybenzoic Acid; Ethylene Glycol Monoester

Classification number:TQ426.94 (Production of reagents and pure chemicals) O643.36 (Physical chemistry (theoretical chemistry), chemical physics)

Funding:Natural Science Foundation of Shaanxi Provincial Department of Science and Technology( SJKY2010048 )Natural Science Foundation of Shaanxi Provincial Department of Education( 2010JK912 )

Online publication date:2012-11-27 (The date of first online publication on Wanfang platform does not represent the publication date of the document)

Summary:The process conditions for synthesizing ethylene glycol p-hydroxybenzoate monoester using p-toluenesulfonic acid as a catalyst and p-hydroxybenzoic acid and ethylene glycol as raw materials were investigated under microwave irradiation. The structure of the product was characterized by infrared spectroscopy and nuclear magnetic resonance spectroscopy. The effects of microwave irradiation power, catalyst dosage, acid-to-alcohol molar ratio, and microwave irradiation time on the esterification rate were examined. The results showed that the optimized conditions for synthesizing ethylene glycol p-hydroxybenzoate monoester were: microwave irradiation power of 500 W, acid-to-alcohol molar ratio of 1:3.5, catalyst dosage of 0.28 g, and microwave irradiation time of 20 min. Under these conditions, the esterification rate reached 92.1%.

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