Patent ID: 7341617

Claim:
A method for inhibiting corrosion and gas hydrate formation, said method comprising adding to a mixture of hydrocarbons and water a compound of formula (1) where R 1 , R 2 are each independently C 1 - to C 22 -alkyl, C 2 - to C 22 alkenyl, C 6 - to C 30 -aryl or C 7 - to C 30 -alkylaryl, R 3 is C 1 - to C 22 -alkyl, C 2 - to C 22 -alkenyl, C 6 - to C 30 -aryl or C 7 - to C 30 -alkylaryl, —CHR 5 —COO − or —O − , R 4 is a radical of the formula (2) m is a number from 0 to 30, A is a C 2 - to C 4 -alkylene group, B is a C 1 - to C 10 -alkylene group, D is an organic radical optionally containing heteroatoms and has from 1 to 600 carbon atoms, said organic radical being selected from the group consisting of a straight-chain or branched C 2 - to C 50 -alkylene group or a straight-chain or branched C 2 - to C 50 -alkenylene group which is derived from a saturated or unsaturated dicarboxylic acid, a C 6 - to C 50 -aryl radical or a C 6 - to C 50 -arylalkyl radical which is derived from a benzenedicarboxylic acid, and a radical of formula (3) where R 7 and R 12 are each either hydrogen or a C 2 - to C 100 -alkyl or C 2 - to C 100 -alkenyl radical and wherein bonding of D occurs through any valence within R 7 or R 12 X, Y are each independently O or NR 6 , R 5 , R 6 are each independently hydrogen, C 1 - to C 22 -alkyl, C 2 - to C 22 -alkenyl, C 6 - to C 30 -aryl or C 7 - to C 30 -alkylaryl, and n is a number from 1 to 30.