Patent ID: 7323609

Claim:
A method for inhibiting corrosion and gas hydrate formation in a mixture of hydrocarbon and water, said method comprising adding to the mixture 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 6 COO − or —O − , A is a C 2 - to C 4 -alkylene group, B is a C 1 - to C 10 -alkylene group, X is O or NR 7 R 6 , R 7 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, R 4 is a C 1 - to C 50 -alkyl, C 2 - to C 50 -alkenyl radical, C 6 - to C 50 -aryl or C 7 - to C 50 -alkylaryl, R 5 is hydrogen, —OH or a C 1 - to C 4 -alkyl radical, n, m are each independently a number from 0 to 30, x is a number from 1 to 6.