Claims
- 1. A coal-water slurry comprising coal, water and a rheological additive comprising the reaction product of a polycarboxylic organic acid having from about 16 to about 60 carbon atoms and from 2 up to 4 carboxyl groups, said polycarboxylic organic acid selected from the group consisting of dimer acids, trimer acids, adducts of unsaturated monocrboxylic acids or dimer acids with maleic anhydride in a molar ratio of about 1:1, adducts of linoleic acid or similar unsaturated monocarboxylic acids with acrylic-type acids in a molar ratio of about 1:1 and aducts of olefins having from about 12 to about 40 carbon atoms with maleic acid or maleic anhydride in a molar ratio of about 1:1; with (a) a polyether glycol having recurring oxyalkylene groups containing up to 4 carbon atoms and a molecular weight of from about 1,000 to about 20,000; and (b) an organic hydroxylic compound having a molecular weight of less than, 1,000 and containing one hydroxyl group; said molar ratio of (a) said polyether glycol to (b) said organic hydroxylic compound ranging from about 4:1 to about 1:4; said polycarboxylic acid having at least 55% up to essentially 100% of the available carboxylic groups reacted.
- 2. The coal-water slurry of claim 1 wherein the rheological additive is present in an amount from about 0.1 percent to about 4 percent.
- 3. The coal-water slurry of claim 2 which contains about 60 to about 80 percent solids by weight and 0.25 to 1.5 percent rheological additive.
- 4. The coal-water slurry of claim 3 wherein the coal has a particle size such that about 60 percent to about 90 percent passes through a 200 mesh U.S. standard sieve.
- 5. The coal-water slurry of claim 4 wherein the temperature of the slurry is maintained over a range from about 2.degree. C. to about 75.degree. C.
- 6. The coal-water slurry of claim 1 wherein (a) is selected from the group consisting of polyethylene glycol, polypropylene glycol and poly(ethylene-propylene) glycol and (b) is selected from the group consisiting of aliphatic monohydric alcohols having from 3 to 22 carbon atoms and alkanolamines having 1 hydroxyl group and 2 to 12 carbon atoms.
- 7. The coal-water slurry of claim 6 wherein the polycarboxylic acid has 75 percent or more of the carboxyl functionality reacted.
- 8. The coal-water slurry of claim 7 wherein the polyether glycol (a) is a polyethylene glycol having a molecular weight from about 3,000 to about 12,000.
- 9. The coal-water slurry of claim 8 wherein 90 percent or more of the carboxyl groups of the polycarboxylic acid are reacted.
- 10. The coal-water slurry of claim 9 wherein the molar ratio of (a) : (b) ranges from 2:1 to 1:2.
- 11. The coal-water slurry of claim 9 wherein the rheological additive is an ester of dimer acid having approximately one-half of the carboxyl groups esterified with a polyethylene glycol having a molecular weight from about 3,000 to about 12,000 and all or a portion of the remaining carboxyl groups reacted with n-decyl alcohol.
- 12. The coal-water slurry of claim 9 wherein the rheological additive is an ester of trimer acid wherein approximately one-third to two-thirds of the carboxyl groups are esterified with a polyethylene glycol having a molecular weight from about 3,000 to about 12,000 and all or a portion of the remaining carboxyl grops are react with n-decyl alcohol.
- 13. The coal-water slurry of claim 9 wherein the rheological additive is an ester of a carboxylic acid which is essentially a 1:1 adduct of dimer acid with maleic acid or maleic anhydride wherein approximately one-quarter to three-quarters of the carboxyl groups are esterified with a polyethylene glycol having a molecular weight of about 3,000 to about 12,000 and all or a portion of the remaining carboxyl groups are reacted with n-decyl alcohol.
- 14. The coal-water slurry of claim 1 wherein all or a portion of any unreacted carboxyl groups of the rheological additive are converted to a salt form.
- 15. The coal-water slurry of claim 14, wherein the salt is a salt of ammonia, a Group IA or IIA metal, an alkanolamine or a heterocyclic nitrogen compound containing up to about 10 carbon atoms and 1 or 2 nitrogen atoms.
- 16. The coal-water slurry of claim 15 wherein the salt is a salt of ammonia, sodium or potassium.
- 17. A coal-water slurry comprising coal, water and a rheological additive comprising the reactoin product of a polycarboxylic organic acid having from about 16 to about 60 carbon atoms and from 2 up to 4 carboxylic groups, said polycarboxylic acid selected from the group consisting of dimer acids, trimer acids, adducts of unsaturated monocarboxylic acids or dimer acids with maleic anhydride in a molar ratio of about 1:1, adducts of linoleic acid or similar unsaturated monocarboxylic acids with acrylic-type acids in a molar ratio of about 1:1 and adducts of olefins having from about 12 to about 40 carbon atoms with maleic acid or maleic anhydride in a molar ratio of about 1:1; with (a) a polyether glycol having recurring oxyalkylene groups containing up to 4 carbon atoms and a molecular weight of from about 1,000 to about 20,000; and (b) an organic hydroxylic compound having a molecular weight of less than 1,000 and containing 1 to 2 hydroxyl groups; said molar ratio of (a) said polyether glycol to (b) said organic hydroxylic compound ranging from about 4:1 to about 1:4; said carboxylic acid having at least 55% up to essentially 100% of the available carboxylic groups reacted, wherein said additive has a residual acid value of 2.8 or less.
- 18. The coal-water slurry of claim 17 wherein the rheological additive is present in an amount of from about 0.1% to about 4%.
- 19. The coal-water slurry of claim 18 which contains from about 60% to about 80% solids by weight and includes 0.25 to 1.5% rheological additive.
- 20. The coal-water slurry of claim 19 wherein the coal has a particle size such tht about 60% to about 90% by weight passes through a 200 mesh U.S. standard sieve.
- 21. The coal-water slurry of claim 20 wherein the slurry is maintained at a temperture in the range of from about 2.degree. C. to about 75.degree. C.
- 22. The coal-water slurry of claim 17 wherein (a) is selected from the group consisting of polyethylene glycol, polypropylene glycol and poly(ethylene-propylene) glycol and (b) is slected from the group consisting of aliphatic monohydric alcohols having from 3 to 22 carbon atoms, aliphatic dihydric alcohols having from 3 to 20 carbon atoms, ether diols having from 4 to 40 carbon atoms from 1 to 20 ether moieties, and alkanolamines having 1 to 3 hydroxyl groups and 2 to 12 carbon atoms.
- 23. The coal-water slurry of claim 22 wherein the polycarboxylic acid has 75 percent or more of the carboxyl functionality reacted.
- 24. The coal-water slurry of claim 23 wherein (a) said polyether glycol is a polyethylene glycol having a molecular weight from about 3,000 to about 12,000.
- 25. The coal-water slurry of claim 24 wherein 90 percent or more of the carboxyl groups of the polycarboxylic acid are reacted.
- 26. The coal-water slurry of claim 25 wherein the molar ratio of (a):(b) ranges from 2:1 to 1:2.
- 27. The coal-water slurry of claim 25 wherein the rheological additive is an ester of dimer acid having approximately one-half of the carboxyl groups esterified with a polyethylene glycol having a molecular weignt from about 3,000 to about 12,000 and all or a portion of the remaining carboxyl groups reacted with a hydroxylic compound selected from the group consisting of n-decyl alcohol, 2-ethyl-1,3-hexanediol, dipropylene glycol, polyethylene glycol having a molecular weight of from 200 to 600, polypropylene glycol having a molecular weight of from 400 to 450 and N-methyldiethanolamine.
- 28. The coal-water slurry of claim 25 wherein the rheological additive is an ester of a trimer acid wherein approximately one-third to two-thirds of the carboxyl groups are esterified with a polyethylene glycol having a molecular weight of from about 3,000 to about 12,000 and all or a portion of the remaining carboxyl groups are reacted with a hydroxylic compound selected from the group consisting of n-decyl alcohol, 2-ethyl-1,3-hexanediol, dipropylene glycol, polyethylene glycol having a molecular weight of from 200 to 600, polypropylene glycol having a molecular weight of from 400 to 450 and N-methyldiethanolamine.
- 29. The coal-water slurry of claim 25 wherein the rheological additive is an ester of a carboxylic acid which is essentially a 1:1 adduct of a dimer acid with maleic acid or maleic anhydride wherein approximately one-quarter to three-quarters of the carboxyl groups are esterified with a polyethylene glycol having a molecular weight of about 3,000 to about 12,000 and all or a portion of the remaining carboxyl groups are reacted witha hydroxylic compound selected from the group consisting of n-decyl alcohol, 2-ethyl-1,3-hexanediol, dipropylene glycol, polyethylene glycol having a molecular weight of from 200 to 600, polypropylene glycol having a molecular weight of from 400 to 450, and N-methyldiethanolamine.
- 30. The coal-water slurry of claim 17 wherein all or a portion of any unreacted carboxylic groups of the rheological additive are converted to a salt form.
- 31. The coal-water slurry of claim 30 wherein the salt is a salt of ammonia, a Group IA or IIA metal, an alkanolamine or a heterocyclic nitrogen compound containing up to about 10 carbon atoms and 1 or 2 nitrogen atoms.
- 32. The coal-water slurry of claim 31 wherein the salt is a salt of ammonia, sodium or potassium.
Parent Case Info
This application is a continuation of application Ser. No. 819,088, filed Jan. 15, 1986, now abaonded.
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Number |
Name |
Date |
Kind |
4129508 |
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Dec 1978 |
|
4534450 |
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Jun 1987 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
819088 |
Jan 1986 |
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