Glycol ester flow improver additive for distillate fuels
AssigneeExxon Research & Engineering Co.
InventorsRobert D. Tack, Kenneth Lewtas, John R. Brazier
Life of this patent
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Abstract
Polyoxyalkylene esters, ethers,ester/ethers or mixtures thereof containing two C.sub.10 -C.sub.30 linear saturated alkyl groups and a polyoxy (C.sub.1 -C.sub.4) alkylene glycol group of molecular weight 200 to 5,000 have been found to be effective distillate fuel flow improvers, especially for narrow boiling distillates hitherto difficult to treat, they may also be used in combination with conventional additives such as ethylene/unsaturated ester copolymers and nitrogen compounds such as diamides or amide/amine salts, ester/amides of dicarboxylic acids.
Claims25
A distillate fuel oil containing 0.001 to 0.5 wt% of a flow improver being a polyoxyalkylene ester, ether, ester/ether or mixtures thereof which contain at least two C.sub.10 to C.sub.30 linear saturated alkyl groups and a polyoxyalkylene glycol of molecular weight in the range of about 100 to 5000 the alkylene group of said polyoxyalkylene glycol containing from 1 to 4 carbon atoms.
A fuel oil composition comprising a middle distillate fuel oil having a boiling range from about 120.degree. C. to 500.degree. C. containing about 0.0001 to 0.5 wt % of a flow improver which is a polyoxyalkylene material which is an ester, ether, ester/ester or mixtures thereof of the general formula
- R--O--(A)--O--R.sup.1
- where R and R.sup.1 are the same or different and may be
- (i) n-Alkyl ##STR10## the alkyl group being linear and saturated and containing 10 to 30 carbon atoms and A is a polyoxyalkylene glycol of molecular weight in the range of about 100 to 5,000 wherein the alkylene group contains from 1 to 4 carbon atoms.
A distillate fuel containing a combination flow improver additive comprising (i) an ester,ether, ester/ether or mixtures thereof of the general formula
- R--O--(A)--O--R.sup.1
- Where R and R.sup.1 are the same or different and may be
- (i) n-Alkyl ##STR11## the alkyl group being linear and saturated and containing 10 to 30 carbon atoms and A is a linear polyoxyalkylene glycol of molecular weight in the range of about 100 to 5,000 wherein the alkylene group contains 1 to 4 carbon atoms and (ii) an ethylene copolymer wax crystal growth inhibitor or a C.sub.30 -C.sub.300 oil soluble polar nitrogen compound wax crystal growth inhibitor being an amine and/or amide salt and/or ester/amide of a carboxylic acid having 1 to 4 carboxylic acid groups or an anhydride thereof.
An additive concentrate for incorporation into distillate fuel containing from 3 to 75 wt.% of an ester, ether, ester/ether or mixtures thereof of the general formula
- R--O--(A)--O--R.sup.1
- where R and R.sup.1 are the same or different and may be
- (i) n-Alkyl ##STR12## the alkyl group being linear and saturated and containing 10 to 30 carbon atoms, and A is a polyoxyalkylene glycol of molecular weight in the range of about 100 to 5,000 wherein the alkylene group contains from 1 to 4 carbon atoms.
A distillate fuel containing a combination flow improver additive comprising (i) 20 to 40 wt.% of an ether, ester/ether or mixtures thereof of the general formula
- R--O--(A)--O--R.sup.1
- Where R and R.sup.1 are the same of different and may be
- (i) n-Alkyl ##STR13## the alkyl group being linear and saturated and containing 10 to 30 carbon atoms and A is a polyoxyalkylene glycol of molecular weight in the range of about 100 to 5,000 wherein the alkylene group contains 1 to 4 carbon atoms and (ii) 80 to 60 wt.% of an ethylene copolymer wax crystal growth inhibitor or a C.sub.30 -C.sub.300 oil soluble polar nitrogen compound wax crystal inhibitor being an amine and/or amide salt and/or ester/amide of a carboxylic acid having 1 to 4 carboxylic acid groups or an anhydride thereof.
Distillate fuel oil boiling in the range about 120.degree. C. to 500.degree. C. including narrow boiling distillates boiling in the range 200.degree. C..+-.50.degree. C. to 340.degree. C..+-.20.degree. C. improved in low temperature flow properties by 0.0001 to 0.5 wt.% of a flow improver comprising 10 to 100 wt.% of a polyoxyalkylene material which is an ester, ether, ether/ester or mixtures thereof containing at least two C.sub.10 to C.sub.30 linear saturated alkyl groups and a polyoxyalkylene glycol of molecular weight 100 to 5000 containing 1 to 4 carbon atoms
- 0 to 90 wt.% of an ethylene/unsaturated monomer copolymer
- 0 to 90 wt.% C.sub.30 -C.sub.300 oil soluble polar nitrogen compound being an amine and/or amide salt and/or ester/amide of a carboxylic acid having 1 to 4 carboxylic acid groups or an anhydride thereof
- 0 to 50 wt.% of a lube oil pour depressant.
Dependencies are inferred from the claim text.