It was found that crystalline procaine hydrochloride can be preparel with the recories of 43.3% at pH 5.5 if ethanol is used as PH regulator.

• 最佳成盐条件为:以价格便宜；污染小的无水乙醇作溶剂；用浓盐酸调节pH至5.；5；收率可达43