Effect of solvent and impurity on synthesis of ethyl lactate from fermentation-derived ammonium lactate

Fermentation-derived ammonium lactate was converted into ethyl lactate by decomposition in various organic solvents followed by esterification with ethanol over Amberlyst catalyst. The ammonium lactate was decomposed more efficiently in an organic solvent with high boiling point, where the produced...

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Bibliographic Details
Published in:Chemical engineering science Vol. 66; no. 20; pp. 4549 - 4554
Main Authors: Kasinathan, Palraj, Hwang, Dong Won, Lee, Uhwang, Hwang, Young Kyu, Chang, Jong-San
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 15.10.2011
Elsevier
Subjects:
amino acids
Ammonium lactate
Applied sciences
Biochemical engineering
Biological and medical sciences
Biotechnology
boiling point
Catalysis
Catalytic reactions
Chemical engineering
Chemical processes
Chemistry
Decomposition reactions
dimethyl sulfoxide
esterification
ethanol
Ethyl alcohol
Ethyl lactate
Exact sciences and technology
Fermentation
Fundamental and applied biological sciences. Psychology
General and physical chemistry
Impurities
Lactates
Lactic acid
Methods. Procedures. Technologies
Others
Phosphates
Reactors
Solvents
temperature
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Various methods and equipments
Catalysis
Chemical processes
Ethyl lactate
Fermentation
Biochemical engineering
Ammonium lactate
Organic solvent
Impurity
Boiling point
Catalyst
Esterification
Strength
ISSN:0009-2509, 1873-4405
Online Access:Get full text
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Summary:Fermentation-derived ammonium lactate was converted into ethyl lactate by decomposition in various organic solvents followed by esterification with ethanol over Amberlyst catalyst. The ammonium lactate was decomposed more efficiently in an organic solvent with high boiling point, where the produced lactic acid was stabilized well as a monomer without oligomerization. However, only the nonreactive phosphate-type solvent such as triethyl phosphate and tributyl phosphate showed a notable ethyl lactate yield in the subsequent esterification reaction compared with dimethyl sulfoxide and N-methyl pyrolidine. The lactic acid yield in ammonium lactate decomposition and the subsequent ethyl lactate yield were also highly dependent on solvent ratio to ammonium lactate, temperature and pressure in ammonium lactate decomposition reaction. The amino acid impurity contained in the fermented ammonium lactate as well as the unreacted ammonium lactate reduced the acid strength of Amberlyst-36, which resulted in the final ethyl lactate yield. ► Ethyl lactate was produced selectively from ammonium lactate by hybrid process. ► Triethyl phosphate was the most efficient solvent for ethyl lactate synthesis. ► The ethyl lactate yield was influenced by the fermentation-derived amino acid.
Bibliography:http://dx.doi.org/10.1016/j.ces.2011.06.017
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ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2011.06.017