Effects of operation variables on the recovery of lactic acid in a batch distillation process with chemical reactions |
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Authors: | Yongwon Seo Won Hi Hong Tae Hee Hong |
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Affiliation: | (1) Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, 305-701 Taejon, Korea;(2) Department of Food and Nutrition, Taejon Health Science College, 300-092 Taejon, Korea |
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Abstract: | In this study, the feasibility of recovery of lactic acid by batch reactive distillation using cation exchange resin as a
catalyst was investigated. For the recovery of lactic acid, two reactions, esterification and hydrolysis, are involved and
hence, an apparatus with two distillation columns was developed and operated in a batch mode to ensure enough residence time
in the reboiler and column. The effects of operation variables such as catalyst loading, reactant mole ratio, feed concentration,
type of alcohols and partial condenser temperature on the yield were studied. In this study, the reaction products of the
esterification (methyl lactate and water) were distilled to the hydrolysis part to be recovered into pure lactic acid. The
yield of lactic acid increased as catalyst loading in the esterification part increased and reactant mole ratio and feed lactic
acid concentration decreased. Methanol as a reactant gave higher yield than any other alcohols. The yield of recovered lactic
acid was as high as 90%. The yield of lactic acid was closely related to the boiling temperature of the reaction mixture in
the esterification part |
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Keywords: | Batch Reactive Distillation Lactic Acid Cation Exchange Resin Esterificaiton Hydrolysis |
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