Ether heat and mass transfer additives for aqueous absorption fluids
AssigneeGas Research Institute
InventorTravis Chandler
Life of this patent
Estimating the term…
Abstract
An aqueous absorption fluid composition, process and apparatus wherein the absorption fluid comprises certain ethers providing improved water vapor absorption and thermal transfer in thermal exchange loops used in absorption refrigeration, chilling, heat pump, energy storage and other thermal transfer applications.
Claims36
An absorption fluid composition comprising aqueous refrigerant, at least one metal halide salt absorbent present in an amount to provide a composition useful as a refrigerant/absorbent and at least one ether heat and mass transfer additive selected from the group consisting of aliphatic ethers having about 4 to about 20 carbon atoms selected from the group consisting of butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, and eicosyl ether;
- aliphatic ethers having, about 4 to about 20 carbon atoms and containing a cyclic ether structure;
- aliphatic fluorinated and perfluorinated others having about 8 to about 24 carbon atoms;
- and aromatic ethers having about 7 to about 20 carbon atoms selected from the group consisting of perfluoro-2-butyltetrahydrofuran, phenyl ether, diphenyl ether, methylphenyl ether (anisole) and dibenzyl ether, wherein said at least one ether is normally liquid at system operating conditions and present in an amount effective as an absorption promoter.
In a process for thermal transfer using an absorption fluid comprising an aqueous metal halide salt refrigerant/absorbent composition, the improvement of obtaining an increased rate of water vapor absorption in said absorption fluid comprising adding thereto an absorption promoting amount of at least one ether heat and mass transfer additive selected from the group consisting of aliphatic ethers having about 4 to about 20 carbon atoms selected from the group consisting of butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, and eicosyl ether;
- aliphatic ethers having about 4 to about 20 carbon atoms and containing a cyclic ether structure;
- aliphatic fluorinated and perfluorinated ethers having about 8 to about 24 carbon atoms;
- and aromatic ethers having about 7 to about 20 carbon atoms selected from the group consisting of perfluoro-2-butyltetrahydrofuran, phenyl ether, diphenyl ether, methylphenyl ether (anisole) and dibenzyl ether, wherein said at least one ether is normally liquid at system operating conditions.
An apparatus for absorption thermal storage, cooling or heating of the type containing an absorption fluid comprising aqueous refrigerant and at least one metal halide salt absorbent present in an amount to provide a composition useful as a refrigerant/absorbent, the improvement of said absorption fluid additionally comprising an absorption promoting amount of at least one ether heat and mass transfer additive selected from the group consisting of aliphatic ethers having about 4 to about 20 carbon atoms selected from the group consisting of butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, and eicosyl ether;
- aliphatic ethers having about 4 to about 20 carbon atoms and containing a cyclic ether structure;
- aliphatic fluorinated and perfluorinated ethers having about 8 to about 24 carbon atoms;
- and aromatic ethers having about 7 to about 20 carbon atoms selected from the group consisting of perfluoro-2-butyltetrahydrofuran, phenyl ether, diphenyl ether, methylphenyl ether (anisole) and dibenzyl ether, wherein said at least one ether is normally liquid at system operating conditions.
Dependencies are inferred from the claim text.