Organic Component Contains Plural Carboxylic Acid, Ester, Or Salt Groups Attached Directly Or Indirectly To Nitrogen By Nonionic Bonding Patents (Class 507/241)
  • Stimulation of coalbed methane production
    Patent number: 5470823
    Abstract: A coalbed formation is stimulated to improve the recovery of methane which involves injecting into the coalbed formation an aqueous acid solution containing an organic amphoteric tertiary ammonium compound having from 1 to 3 tertiary ammonium groups, each N of which contains at least one C.sub.3 to C.sub.4 unsaturated carboxylic acid group, and wherein the compound contains a terminal benzyl or C.sub.5 -C.sub.19 alkyl group.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: November 28, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Dennis A. Williams, James R. Looney, Michael W. Conway, Robert A. Swenson
  • Amine adducts as corrosion inhibitors
    Patent number: 5427999
    Abstract: Amines which are compounds of the formula I: ##STR1## where R is a C.sub.6-20 hydrocarbon;X is --NR.sub.1 -- or --O--;each R.sub.1 is independently H or --[(CH.sub.2).sub.1-4 ]COOH or a C.sub.6-20 hydrocarbon;n is 1, 2 or 3;and which contains at least one (CH.sub.2).sub.1-4 COOH group; or salt thereof are useful in inhibiting corrosion of metals in a marine or freshwater environment e.g. in oil- and gas-field applications since they show relatively low toxicity to marine organisms.
    Type: Grant
    Filed: May 14, 1992
    Date of Patent: June 27, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Paul J. Clewlow, John A. Haslegrave, Niall Carruthers, Daniel S. Sullivan, III, Brent Bourland