Process for concentrating dilute aqueous starch mixtures

Details Process for concentrating dilute aqueous starch mixtures Process for concentrating dilute aqueous starch mixtures

1975-05-02

1977-07-19

Scovronek, Joseph

Sugar, starch, and carbohydrates

Processes

Carbohydrate manufacture and refining

127 66, 127 67, 209 18, 209173, 209211, 210521, C13L 100

Patent

active

040366642

ABSTRACT:
Process for concentrating starch contained in very dilute, aqueous mixtures having, for example, a starch content of less than about 1 weight percent. The concentrated product is obtained as an aqueous mixture containing starch solids in the amount of at least about 30 weight percent, preferably about 35 to 50 weight percent. The concentrating operation involves the sequential use of a gravity settling technique, especially lamellar plate settling, to increase the starch content of the solid-liquid mixture to about 5 to 20 weight percent. This mixture can be readily removed from the settler, and further concentrated centrifugally, e.g., in a liquid cyclone, by a factor of at least about 2 to provide the desired aqueous mixture having a concentration of at least about 30 weight percent of starch solids. The latter stream can be readily and effectively handled and treated to recover relatively pure, essentially solid, food grade starch of low moisture content, e.g., less than about 10 weight percent.

REFERENCES:
patent: 2149802 (1939-03-01), Thurber
patent: 2418669 (1947-04-01), Schilling
patent: 2798011 (1957-07-01), Fontein
patent: 2974068 (1961-03-01), Fontein
patent: 3736182 (1973-05-01), Wright
patent: 3890888 (1975-06-01), Verberne

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