Patent · US Expired

Agent and method for deoiling sand and rock masses

US4451631A · kind A · utility

11Cited by

3References

9Claims

0Family size

Assignee

Cassella Aktiengesellschaft · DE

Inventors

Friedrich Engelhardt · Frankfurt, DE
Hermann Schmitz
Walter Gulden · Hofheim, DE
Jorg Hax · Wiesbaden, DE

Key dates

Filing date	Sep 23, 1982
Grant date	May 29, 1984
Priority date	—
Expiry date	Sep 23, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S507/936
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

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 ##STR1## 2 to 40% by weight of units of the formula ##STR2## and 38 to 93% by weight of units of the formula ##STR3## and partial hydrolysates thereof, wherein when R.sup.1 is hydrogen, R.sup.2 is hydrogen, methyl or ethyl, Y is --CO--NH--C(CH.sub.3).sub.2 --CH.sub.2 -- or a direct bond, and X.sup..sym. is a cation; when R.sup.1 and R.sup.2 are identical or different, each is hydrogen, methyl, ethyl or, together are trimethylene, Y is --CO--NH--C(CH.sub.3).sub.2 --CH.sub.2 -- and X.sup..sym. is cation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.