Acid/heat modified polysaccharide biopolymers

Details Acid/heat modified polysaccharide biopolymers Acid/heat modified polysaccharide biopolymers

1989-09-13

1991-04-23

Robinson, Douglas W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

536123, 536124, 166246, 435104, C07G 17001, C08B 3700, E21B 4322

Patent

active

050101862

ABSTRACT:
Novel deacetylated polysaccharide biopolymers having improved viscosity/filtrability/injectability, well adopted for the secondary and tertiary recovery of oil deposits, are conveniently prepared by (i) acidifying an aqueous polysaccharide composition, e.g., a carbohydrate fermentation broth, with nitric acid to a pH of from about 2 to 0.1, (ii) heat-treating said acidified composition at a temperature of from about 50.degree. to 100.degree. C. for from about 5 to 60 minutes, and (iii) cooling said heat-treated composition and adjusting the pH thereof to a value of from about 5 to 7.

REFERENCES:
patent: 3000790 (1961-09-01), Jeanes et al.
patent: 4182860 (1980-01-01), Naslund et al.
patent: 4214912 (1980-07-01), Racciato et al.
patent: 4440225 (1984-04-01), Holzwarth
patent: 4493774 (1985-01-01), Bragg
patent: 4667026 (1987-05-01), Jarry et al.

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