Search for a suitable method for the industrial separation of L-menthol carboxylic acid from its impurity neomenthol carboxylic acid.The following methods were used to observe the effect of the separation and purification,organic acid salt crystallisation,amine salt crystallisation,carbon dioxide flux method,weak base purification method.The results showed that the carbon dioxide flux method and the weak base purification method were effective in separating impurities of L-menthol carboxylic acid.Therefore,the weak base purification method combined crystallisation method is simple to operate,with high product purity and high yields,which is of some reference value for industrial production.
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