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Study on one-step method for preparing pyrogallol from tara powder



Study on one-step method for preparing pyrogallol from tara powder



Chemistry and Industry of Forest Products 16(2): 7-12



Pyrogallol was prepared by a one-step method from tara powder (from the pods of Caesalpinia spinosa). The optimum conditions of reaction were found to be: ratio of tara powder to water: 1:3 by weight, quantity of calcium oxide added: 15-25% of tara powder, reaction temperature: 200 degrees C, and reaction time: 3 h. The product, after purification with xylene, met the requirement of reagent standards of pyrogallol. The content of pyrogallol was 99.0% (HPLC method).

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