PROCESS FOR THE PRODUCTION OF HYDRO-SOLUBLE COPOLYMERS WELL AS COMPOSITION AND PROCESS FOR THE EXTRACTION OF OIL FROM SAND PASTA OR ROCK PASTA CONTAINING MINERAL OIL

摘要

Sand or rock masses containing mineral oil are deoiled with a deoiling agent containing an aqueous solution of a water-soluble copolymer which is a random distribution of 5 to 60% of weight of units of the formula IMAGE 2 to 40% by weight of units of the formula IMAGE and 38 to 93% by weight of units of the formula IMAGE and partial hydrolysates thereof, wherein when R1 is hydrogen, R2 is hydrogen, methyl or ethyl, Y is -CO-NH-C(CH3)2-CH2- or a direct bond, and X(+) is a cation; when R1 and R2 are identical or different, each is hydrogen, methyl, ethyl or, together are trimethylene, Y is -CO-NH-C(CH3)2-CH2- and X(+) is cation.