METHOD OF PREPARING SODIUM CARBOXYMETHYL CELLULOSE Russian patent published in 1997 - IPC

Abstract RU 2096417 C1

FIELD: drilling of oil and gas wells. SUBSTANCE: crushed straw is treated with sodium hydroxide solution having concentration of 18-40 wt % at liquid modulus of 5-15 and 70-90 C. The resulting alkaline cellulose is etherified with sodium salt of monochloroacetic acid at 70-110 C, and the product is dried. EFFECT: more efficient preparation method. 2 tbl

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RU 2 096 417 C1

Authors

Nigmatullin N.G.

Nigmatullina A.G.

Akchurin Kh.I.

Terent'Ev V.S.

Chezlov A.A.

Dates

1997-11-20—Published

1991-12-02—Filed