TBAB Catalyzed Synthesis of Phenoxyethanol From Ethylene Carbonate and Phenol
Developing a solvent-free,low catalyst usage,high raw material conversion rate,and good product selectivity synthesis process for benzyl alcohol is of great significance.The synthesis of phe-noxyethanol from phenol and ethylene carbonate using TBAB as a catalyst was studied.The effects of material ratios of ethylene carbonate and phenol,catalyst dosage,reaction temperature,and reaction time on the synthesis of phenoxyethanol were studied.The optimal process conditions were obtained as follows:the molar ratio of ethylene carbonate to phenol was 1.05∶1.00,the amount of TBAB was 1％of phenol mass,the reaction temperature was 145 ℃,and the reaction time was 4.5 hours.Under these conditions,the conversion rate of phenol is 99.77％and the selectivity of phenoxyethanol is 99.08％.By separating and purifying the reaction solution,high-purity phenoxyethanol can be ob-tained.Qualitative analysis of the reaction solution was conducted using GC-MS,and it was found that only four by-products were produced except for the products.The GC internal standard method was used to quantitatively determine phenol and products in the reaction solution.
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