Process of converting starch to glucose and glucose to lactic acid

Patent Application · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6089794

Tsai, TenLin; Sanville, C Y; Coleman, R D; Schertz, W W

This document describes a method for converting starch into lactic acid of sufficient purity for use as a substrate for biodegradable plastics. The process is designed to work on industrial food waste streams such as potato wastes or cheese whey permeate. For potato waste, {alpha}-amylase and calcium chloride are added to the starch containing waste and incubated at a pH of 4--7, a temperature of 90--130{degree}C, and a pressure above 15 psi for not less than 15 minutes. At this point, glucoamylase is added and the mixture is incubated at a temperature of 50--70{degree}C and a pH below 6.5 for 4 hours. This results in the conversion of more than 90% of the starch into glucose, which is substantially free of microbial contamination. The hydrolysate is filtered, and introduced with additional nutrients to a fermentor containing a lactose producing microorganism to form a fermentation broth. This results in the fermentation of glucose to lactose, which is filtered and subjected to electrodialysis for purification. Conversion of glucose to lactic acid or lactate occurs with an efficiency of over 95%. 1 fig. (MHB)

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: Dept. of Energy
• Patent Number(s): PATENTS-US-A7504223
• Application Number: ON: DE92003840; PPN: US 7-504223
• OSTI ID: 6089794
• Resource Relation: Patent File Date: 4 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
GLUCOSE
FERMENTATION
LACTIC ACID
PRODUCTION
STARCH
BIOCONVERSION
AGRICULTURAL WASTES
AMYLASE
BIOREACTORS
ENZYMATIC HYDROLYSIS
FILTRATION
PH VALUE
PRESSURE DEPENDENCE
REACTION INTERMEDIATES
TEMPERATURE DEPENDENCE
ALDEHYDES
CARBOHYDRATES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
DECOMPOSITION
ENZYMES
GLYCOSYL HYDROLASES
HEXOSES
HYDROLASES
HYDROLYSIS
HYDROXY ACIDS
LYSIS
MONOSACCHARIDES
O-GLYCOSYL HYDROLASES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC WASTES
POLYSACCHARIDES
PROTEINS
REAGENTS
SACCHARIDES
SEPARATION PROCESSES
SOLVOLYSIS
WASTES
090900* - Biomass Fuels- Processing- (1990-)