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Extraction with Ethanol as an Energy‐Saving Alternative to Conventional Drying of Corn Starch
Author(s) -
KROCHTA J. M.,
LOOK K. T.,
HUDSON J. S.,
PAVLATH A. E.
Publication year - 1981
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1981.tb02990.x
Subject(s) - starch , extraction (chemistry) , countercurrent exchange , ethanol , distillation , wet milling , corn starch , alcohol , pulp and paper industry , chemistry , process (computing) , chromatography , process engineering , food science , organic chemistry , engineering , thermodynamics , computer science , physics , operating system
Drying of starch derived from corn wet‐milling is an energy intensive operation in an energy intensive industry. An alternative to conventional drying involves extraction of water from the starch with an ethanol solution and reconcentration of the ethanol by distillation. Equilibrium data for starch with various concentrations of ethanol in water were obtained. These data were used to calculate the effect of multistage countercurrent extraction of mechanically dewatered starch using a mathematical model of the process. The energy required for drying the extracted starch and recovering the alcohol is predicted to be considerably less than that required for conventional drying. Energy savings up to 40% and more are possible.