Heat transfer fluid, additive package, system and method
View Patent ↗Disclosed herein is a heat transfer fluid, comprising a hydroxylated carboxylic acid of formula (OH)x(R1)(COOH)y, wherein x is 2 to 10, y is 3 to 10, and R1 is a C2-50 aliphatic group, a C6-50 aromatic group, or a combination thereof; and wherein the hydroxylated carboxylic acid comprises the hydroxylated carboxylic acid, an ester thereof, a salt thereof, an anhydride thereof, or a combination thereof. A heat transfer system comprises an aluminum component, a magnesium component, or an aluminum component and a magnesium component; and the foregoing heat transfer fluid.
1. A heat transfer fluid, comprising:
less than or equal to 90 weight percent water;
1 to 99 weight percent alcohol;
0.01 to 10 weight percent of a hydroxylated carboxylic acid of formula (I):
(OH) x (R 1 )(COOH) y
wherein x is 2 to 10, y is 3 to 10, and R 1 is a C 2-50 aliphatic group, a C 6-50 aromatic group, or a combination thereof;
wherein the hydroxylated carboxylic acid comprises the hydroxylated carboxylic acid, an ester thereof, a salt thereof, an anhydride thereof, or a combination thereof and wherein weight percent is based on the total weight of the heat transfer fluid; and
wherein the heat transfer fluid is free of silicates.
2. A heat transfer fluid comprising:
less than or equal to 90 weight percent water;
1 to 99 weight percent alcohol;
0.01 to 10 weight percent of a hydroxylated carboxylic acid of formula (II):
R 2 [R 4 (OH) x (COOH) y−z ][R 3 (COOH) z ] (II)
wherein
R 2 is monovalent,
R 3 has a total valence of 1+z,
R 2 and R 3 are independently a C 1-20 aliphatic group, C 6-20 aromatic group, or a combination thereof,
R 4 has a total valence of 2+x+y−z, and is a C 2-15 aliphatic group, C 6-15 aromatic group, or a combination thereof,
z is 1 to 8, with the proviso that y-z is greater than or equal to 2,
wherein the hydroxylated carboxylic acid comprises the hydroxylated carboxylic acid, an ester thereof, a salt thereof, an anhydride thereof, or a combination thereof and wherein weight percent is based on the total weight of the heat transfer fluid; and
wherein the heat transfer fluid is free of silicates.
3. The heat transfer fluid of claim 2 , wherein the hydroxylated carboxylic acid is of formula (III):
R 5 [R 7 (OH) x (COOH) y−z ][R 6 (COOH) z ] (III),
wherein
R 5 and [R 6 (COOH) z ] have a total valence of 1, and are independently a C 1-20 aliphatic group selected from the group consisting of an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, and a combination thereof,
[R 7 (OH) x (COOH) y−z ] has a total valence of 2, and is a C 1-15 aliphatic group selected from the group consisting of an alkylene group, an alkenylene group, a cycloalkylene group, a cycloalkenylene group, and a combination thereof.
4. The heat transfer fluid of claim 3 , wherein the hydroxylated carboxylic acid is of formula (IV):
CH 3 (CH 2 ) m [R 7 (OH) x (COOH) y−1 ](CH 2 ) n (COOH) (IV),
wherein m and n are independently 0 to 19.
5. The heat transfer fluid of claim 4 , wherein m and n are independently 0 to 15.
6. The heat transfer fluid of claim 5 , wherein m and n are independently 0 to 10.
7. The heat transfer fluid of claim 6 , with the proviso that m+n is less than or equal to 16.
8. The heat transfer fluid of claim 4 , wherein the hydroxylated carboxylic acid is selected from the group consisting of:
a hydroxylated carboxylic acid of formula (V):
a hydroxylated carboxylic acid of formula (VI):
and a combination thereof.
9. The heat transfer fluid of claim 8 , wherein m and n are independently 0 to 15.
10. The heat transfer fluid of claim 9 , wherein m and n are independently 0 to 10, with the proviso that m+n is less than or equal to 16.
11. The heat transfer fluid of claim 8 , wherein the anhydride of the hydroxylated carboxylic acid of formula (V) is of formula (XI):
12. The heat transfer fluid of claim 1 , wherein the ester of the hydroxylated carboxylic acid is of formula (VII):
(OH) x (R 1 )(COOH) y−p (COOR 8 ) p (VII),
wherein p is 1 to 9, with the proviso that p is less than or equal to y, and R 8 is a C 1-50 hydrocarbyl group.
13. The heat transfer fluid of claim 12 , wherein R 8 is of formula (VIII):
wherein s is 0 to 10.
14. The heat transfer fluid of claim 1 , wherein the salt of the hydroxylated carboxylic acid is of formula (IX):
(OH) x−q (OM) q (R 1 )(COOH) y−p (COOM) p (IX),
wherein q is 1 to 9, with the proviso that q is less than or equal to x, and M comprises an organic cation, an inorganic cation, or a combination thereof.
15. The heat transfer fluid of claim 14 , wherein M comprises an alkali metal cation, an alkaline earth metal cation, a transition metal cation, an ammonium cation, a phosphonium cation, a pyridinium cation, an imidazolinium cation, a pyrazolinium cation, a triazolinium cation, a tetrazolinium cation, or a combination thereof.
16. The heat transfer fluid of claim 1 , wherein the anhydride of the hydroxylated carboxylic acid is of formula (X):
wherein v is 2, 4, 6, 8, or 10, with the proviso that v is less than or equal to y.
17. The heat transfer fluid of claim 1 , comprising about 0.01 percent by weight to about 10 percent by weight of the hydroxylated carboxylic acid, based on the total weight of the heat transfer fluid.
18. The heat transfer fluid of claim 17 , comprising about 0.1 percent by weight to about 5 percent by weight of the hydroxylated carboxylic acid, based on the total weight of the heat transfer fluid.
19. A method of treating a heat transfer fluid, comprising:
mixing with the heat transfer fluid an additive package comprising a hydroxylated carboxylic acid of formula (I):
(OH) x (R 1 )(COOH) y (I),
wherein x is 2 to 10, y is 3 to 10, and R 1 is a C 2-50 aliphatic group, a C 6-50 aromatic group, or a combination thereof such that the amount of hydroxylated carboxylic acid is 0.01 to 10 weight percent;
wherein the heat transfer fluid comprises less than or equal to 90 weight percent water, 1 to 99 weight percent of an alcohol, or a combination thereof, and is free of silicates; and
wherein the hydroxylated carboxylic acid comprises the hydroxylated carboxylic acid, an ester thereof, a salt thereof, an anhydride thereof, or a combination thereof and weight percent is based on the total weight of the heat transfer fluid after addition of the additive package.
20. The heat transfer fluid of claim 1 , wherein the alcohol comprises a monohydric alcohol, a polyhydric alcohol, or a combination thereof.
21. The heat transfer fluid of claim 20 , wherein the alcohol is selected from the group consisting of methanol, ethanol, propanol, butanol, furfural, tetrahydrofurfurol, ethoxylated furfural, alkoxy alkanol, ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, butylene glycol, glycerol, glycerol-1,2-dimethyl ether, glycerol-1,3 dimethyl ether, monoethylether of glycerol, sorbitol, 1,2,6-hexanetriol, trimethylol propane, and a combination thereof.
22. The heat transfer fluid of claim 1 , comprising about 0 to about 99.9 percent by weight of the alcohol, based on the total weight of the heat transfer fluid.
23. The heat transfer fluid of claim 1 , comprising about 1 to about 60 percent by weight of the water, based on the total weight of the heat transfer fluid.
24. The heat transfer fluid of claim 1 , further comprising a corrosion inhibitor comprising an azole, a siloxane, a colloidal silica, a C 6 to C 14 aliphatic or aromatic mono- or di-carboxylic acid, a C 6 to C 14 aliphatic or aromatic mono- or di-carboxylate, a tall oil fatty acid, a borate, a nitrate, a nitrite, an alkali metal salt thereof, an alkaline earth metal salt thereof, an ammonium salt thereof, an amine salt thereof, or a combination thereof.
25. The heat transfer fluid of claim 1 , further comprising an oxy-anion of molybdenum, tungsten, vanadium, phosphorus, antimony, or a combination thereof.
26. The heat transfer fluid of claim 1 , further comprising a colorant, an antifoam agent, a wetting agent, a biocide, a bitterant, a dispersant or a combination thereof.