Method for improving specific Xanthan productivity during continuous fermentation. [Xanthomonas sp. , Xanthomonas campestris]

Patent · Tue Jan 19 04:00:00 EST 1982

OSTI ID:6929671

Weisrock, W P

The heteropolysaccharides produced by the action of Xanthomonas bacteria on carbohydrate media have a potential application as film forming agents and as thickeners for oil field drilling fluids, fracturing liquids, and emulsifying, stabilizing, and sizing agents. Heteropolysaccharides, particularly xanthan gum, have significant potential as mobility control agents in micellar polymer flooding. Xanthan gum has excellent viscosifying properties at low concentration; it is resistant to shear degradation and exhibits only minimal losses in viscosity as a function of temperature, pH, and ionic strength. During continuous culture, the concentration of biomass is set by the concentration of the limiting nutrient being fed with the medium and biomass concentration is varied by raising or lowering the limiting nutrient concentration. By growing a species of the genus Xanthomonas such as Xanthomonas campestris, in continuous culture in a medium containing glucose, mineral salts, and NH/sub 4/Cl and either glutamate or glutamate plus yeast extract, the specific productivity is improved by first operating and then raising the cell concentration. 16 claims.

• Assignee: Standard Oil Co. (Indiana)
• Patent Number(s): US 4311796
• OSTI ID: 6929671
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300 -- Petroleum-- Drilling & Production
09 BIOMASS FUELS
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550700* -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ADDITIVES
BACTERIA
BIOSYNTHESIS
CARBOHYDRATES
CONTINUOUS CULTURE
CULTURE MEDIA
DRILLING FLUIDS
EMULSIFIERS
FLUIDS
FRACTURING FLUIDS
MICROORGANISMS
NUTRIENTS
ORGANIC COMPOUNDS
POLYMERS
POLYSACCHARIDES
PRODUCTIVITY
QUANTITY RATIO
SACCHARIDES
SYNTHESIS
XANTHUM GUM