Middle distillate hydrocarbon foam control agents from cross-linked organopolysiloxane-polyoxyalkyenes
AssigneeDow Corning Corporation
InventorsKenneth C. Fey, Christopher S. Combs
Life of this patent
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Abstract
Organosilicone materials that are "density-matched" to the hydrocarbon medium also act as defoamers in hydrocarbon fuel, specifically as described herein for diesel fuel. Specifically these new defoamers can be described as cross-linked organopolysiloxane-polyoxyalkylenes. They have the characteristics of being slightly soluble or insoluble in water and hydrocarbon fuels. By changing the solvent and the method of dispersion, different particle size distributions are obtained.
Claims22
A composition having a reduced tendency to foam consisting essentially of:
- a hydrocarbon fuel;
- and
- a density matched organopolysiloxane-polyoxyalkylene in an amount of 100 parts per million or less by volume of hydrocarbon fuel, wherein said density matched organopolysiloxane-polyoxyalkylene is selected from the group consisting essentially of:
- ##STR5## where:
- Me is CH.sub.3 --;
- R is 2 to 25 aliphatic carbon radicals;
- R' is selected from a group consisting essentially of:
- (i) divalent organic radicals, and
- (ii) divalent organosiloxane groups,
- wherein (i) and (ii) do not contain hydrolyzable groups;
- R" is a terminal group;
- R'"is independently selected from the group consisting essentially of:
- (i) hydrogen, and
- (ii) aliphatic carbon radicals having 1 to 25 carbon atoms;
- R.sub.1 is independently selected from the group consisting essentially of:
- (i) hydrogen, and
- (ii) aliphatic carbon radicals having 1 to 3 carbon atoms;
- each x=1-200;
- each c=1-5;
- each z=1-600;
- each y=1-40;
- x+y+z.gtoreq.10;
- each a=4-40;
- and
- each b=1-40.
A method for reducing the amount of foam in a hydrocarbon fuel, comprising the step of:
- adding to a hydrocarbon fuel, where said hydrocarbon fuel is diesel fuel or jet fuel, an antifoaming agent which is a density matched organopolysiloxane-polyoxyalkylene selected from the group consisting essentially of:
- ##STR6## where:
- Me is CH.sub.3 --;
- R is 2 to 25 aliphatic carbon radicals;
- R' is selected from a group consisting essentially of:
- (i) divalent organic radicals, and
- (ii) divalent organosiloxane groups,
- wherein (i) and (ii) do not contain hydrolyzable groups;
- R" is a terminal group;
- R'" is independently selected from the group consisting essentially of:
- (i) hydrogen, and
- (ii) aliphatic carbon radicals having 1 to 25 carbon atoms;
- R.sub.1 is independently selected from the group consisting essentially of:
- (i) hydrogen, and
- (ii) aliphatic carbon radicals having 1 to 3 carbon atoms;
- each x=1-200;
- each c=1-5;
- each z=1-600;
- each y=1-40;
- x+y+z.gtoreq.10;
- each a=4-40;
- and
- each b=1-40.
A composition comprising:
- a hydrocarbon fuel, where the hydrocarbon fuel is diesel fuel or jet fuel;
- and
- a density matched organopolysiloxane-polyoxyalkylene in an amount of 100 parts per million or less by volume of hydrocarbon fuel, wherein said density matched organopolysiloxane-polyoxyalkylene is selected from the group consisting essentially of:
- ##STR7## where:
- Me is CH.sub.3 --;
- R is 2 to 25 aliphatic carbon radicals;
- R' is selected from a group consisting essentially of:
- (i) divalent organic radicals, and
- (ii) divalent organosiloxane groups,
- wherein (i) and (ii) do not contain hydrolyzable groups;
- R" is a terminal group;
- R'" is independently selected from the group consisting essentially of:
- (i) hydrogen, and
- (ii) aliphatic carbon radicals having 1 to 25 carbon atoms;
- R.sub.1 is independently selected from the group consisting essentially of:
- (i) hydrogen, and
- (ii) aliphatic carbon radicals having 1 to 3 carbon atoms;
- each x=1-200;
- each c=1-5;
- each z=1-600;
- each y=1-40;
- x+y+z.gtoreq.10;
- each a=4-40;
- and
- each b=1-40.
Dependencies are inferred from the claim text.