Alcohol fuels of decreased corrosivity

Claim 1

A fuel useful in internal combustion engines comprising a major amount of a C 1 to C 5 alkanol and at least a corrosivity-reducing amount of a metal passivating fuel additive selected from the group consisting of: (A) alkylene polyamines having from 4 to 30 carbons and 2 to 11 nitrogens; (B) C 12 to C 36 acylated derivatives of said alkylene polyamines; and (C) an amine salt of an alkyl acid phosphate which is of the general formula- ##STR5## wherein x is 1 or 2, R 5 is a C 8 to C 13 hydrocarbyl group, R 2 is a hydrogen atom or C 3 to C 12 hydrocarbyl group, R 3 is a hydrogen atom or C 3 to C 12 hydrocarbyl group, and R 1 is selected from the group consisting of- (a) C 8 to C 18 hydrocarbyl groups or mixtures thereof, (b) amino hydrocarbyl groups of the formula --CH 2 -- n NHR 4 where x is 1 or --CH 2 -- n N + H 2 R 4 when x is 2, wherein n is 2 or 3 and R 4 is (a) above, and (c) alkylene polyamino groups of the formula --CH 2 CH 2 NH-- m H wherein m is an integer between 2 and 4, and, mixtures thereof.

Claim 5

A method for reducing the metal corrosivity of an alkanol fuel for automobile engines comprising the step of adding to said alkanol at least a corrosivity-reducing amount, in the range of about 0.0001 to 0.02 wt. %, based on the total weight of the fuel, of a metal passivating fuel additive selected from the group consisting of: (A) alkylene polyamines having from 4 to 30 carbons and 2 to 11 nitrogens; (B) C 12 to C 36 acylated derivatives of said alkylene polyamines; and (C) an amine salt of a mixed alkyl acid phosphate which is of the general formula- ##STR7## wherein x is 1 or 2, R 5 is a C 8 to C 13 hydrocarbyl group, R 2 is a hydrogen atom or C 3 to C 12 hydrocarbyl group, R 3 is a hydrogen atom or C 3 to C 12 hydrocarbyl group, and R 1 is selected from the group consisting of- (a) C 8 to C 18 hydrocarbyl groups or mixtures thereof, (b) amino hydrocarbyl groups of the formula --CH 2 -- n NHR 4 where x is 1 or --CH 2 -- n N + H 2 R 4 when x is 2, wherein n is 2 or 3 and R 4 is (a) above, and (c) alkylene polyamino groups of the formula --CH 2 CH 2 NH-- m H wherein m is an integer between 2 and 4, and, mixtures thereof.

Claim 6

A method for reducing the metal corrosivity of an alkanol fuel for automobile engines comprising the step of adding to said alkanol at least a corrosivity-reducing amount, in the range of about 0.0001 to 0.02 wt. %, based on the total weight of the fuel, of a metal passivating fuel additive selected from the group consisting of: (A) alkylene polyamines having from 4 to 30 carbons and 2 to 11 nitrogens; (B) C 12 to C 36 acylated derivatives of said alkylene polyamines; and (C) an amine salt of a mixed alkyl acid phosphate which is of the general formula- ##STR7## wherein x is 1 or 2, R 5 is a C 8 to C 13 hydrocarbyl group, R 2 is a hydrogen atom or C 3 to C 12 hydrocarbyl group, R 3 is a hydrogen atom or C 3 to C 12 hydrocarbyl group, and R 1 is selected from the group consisting of- (a) C 8 to C 18 hydrocarbyl groups or mixtures thereof, (b) amino hydrocarbyl groups of the formula --CH 2 -- n NHR 4 where x is 1 or --CH 2 -- n N + H 2 R 4 when x is 2, wherein n is 2 or 3 and R 4 is (a) above, and (c) alkylene polyamino groups of the formula --CH 2 CH 2 NH-- m H wherein m is an integer between 2 and 4, and, mixtures thereof.