Ether phosphonate surfactants having branched hydrophobic tails

Details Ether phosphonate surfactants having branched hydrophobic tails Ether phosphonate surfactants having branched hydrophobic tails

1987-12-30

1989-05-16

Howard, Jacqueline V.

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

Organic compounds

Phosphorus esters

252 8551, 252 8554, C07F 938

Patent

active

048311766

ABSTRACT:
Novel ether phosphonate surfactants having a branched hydrophobic tail are used in a process for enhanced oil recovery from a subterranean oil reservoir. They combine a high oil-mobilizing capacity with a good tolerance against divalent ions. The ether phosphonate surfactants are summarized by the formula ##STR1## where R.sub.1 and R.sub.2, being the same or different, are hydrocarbons containing 3-18 carbon atoms each and optionally containing functional groups such as ether and hydroxyl; X is an alkyleneoxy group derived from an alkylene oxide having 2-3 carbon atoms; Y is an alkylene group having 1-4 carbon atoms; R.sub.3 is an alkyl group having 1-4 carbon atoms; M.sup.+ is a monovalent cation; n.sub.1 and n.sub.2, being the same or different, are a number from 0 to 4; m.sub.1 and m.sub.2, being the same or different, are 0 or 1, both m.sub.1 and m.sub.2 not being 0 at the same time and m.sub.1 being 1 when n.sub.1 is a number from 1 to 4 and m.sub.2 always being 1 when n.sub.2 is a number from 1 to 4; and p is a number from 0 to 10.

REFERENCES:
patent: 4316810 (1982-02-01), Barnham et al.
patent: 4319636 (1982-03-01), Kudchadker et al.
patent: 4468335 (1984-08-01), Chen et al.
patent: 4787994 (1988-11-01), Thorne et al.

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