The results show that the industrial-grade 0.05 mol, gallic acid, methanol 50 mL, catalyst dosage of 10 g, 70 ℃ constant temperature water bath heating stirring reaction 20 h, the esterification rate above 95%.Crude ester by recrystallization, decoloring, MG yield of above 90%, and HPLC purity of more than 99.0%."
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