Issue
Korean Journal of Chemical Engineering,
Vol.16, No.5, 556-561, 1999
Effects of Operation Variables on the Recovery of Lactic Acid in a Batch Distillation Process with Chemical Reactions
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.
[References]
  1. Bessling B, Loning JM, Ohligschlager A, Schembecker G, Sundmacher K, Chem. Eng. Technol., 21(5), 393, 1998
  2. Choi JI, Hong WH, J. Chem. Eng. Jpn., 32(2), 184, 1999
  3. Choi JI, Hong WH, Chang HN, Int. J. Chem. Kinet., 28, 37, 1996
  4. Chopade SP, Sharma MM, React. Funct. Polym., 32(1), 53, 1997
  5. Cockrem CM, Johnson PD, "Recovery of Lactate Esters and Lactic Acid from Fermentation Broth," U.S. Patent, 5,210,296, 1993
  6. Evangelista RL, Nikolov ZL, Appl. Biochem. Biotechnol., 57-58, 471, 1996
  7. Helfferich F, "Ion Exchange," McGraw-Hill, New York, 1962
  8. Lipinsky ES, Sinclair RG, Chem. Eng. Sci., 82, 26, 1986
  9. Seo Y, Hong WH, J. Chem. Eng. Jpn., 33(1), 128, 2000
  10. Seo Y, "A Study on the Purification of Lactic Acid Using Esterification and Batch Reactive Distillation," M.S. Thesis, KAIST, Taejon, 1999
  11. Troupe RA, Kobe KA, Anal. Chem., 22(4), 545, 1950
  12. Vickroy TB, "Lactic Acid," Comprehensive Biotechnology, Murray Moo-Young, eds., Permagon Press, Oxford, 1985