In order to solve the problem of poor decolorization effect and high energy consumption of batch decolorization process for crude lactic acid,a new continuous decolorization process for crude lactic acid was introduced,the decolorization experiment of crude lactic acid was carried out by using continuous decolorization equipment.The optimum conditions of continuous decolorization of crude lactic acid were determined by many experiments:the ratio of m(powdered activated carbon):m(crude lactic acid)=1∶10,the amount of added activated carbon solution was 5%,the decolorization time was 2～3 hours and the decolorization temperature was 70℃.The results show that the continuous decolorization process of crude lactic acid has a good decolorization effect,which can reduce the consumption of powdered activated carbon,save the consumption of steam,reduce the production cost and meet the requirements of stable operation of production system.
lactic acidcrude lactic acidactivated carbondecolorizationmass ratio
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