Non-volatile high-lift ammonia vapor absorbent
OwnerDonald C. Ericksoninventor
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Abstract
An absorbent solution for absorbing and desorbing useful quantities of ammonia vapor is disclosed. The absorbent has much lower vapor pressure than water, and has a wider solubility field and higher crystallization limit than any previously known non-volatile absorbent for ammonia. It is useful in absorption cycle processes and apparatus requiring high lifts from temperatures well below freezing, e.g., in thermally actuated industrial refrigeration systems or cold-climate absorption heat pumps for space heating. The new absorbent is also useful with other ammonia-type vapor, e.g., monomethylamine.
Claims16
A liquid absorbent solution capable of reversibly absorbing and desorbing ammonia vapor comprising between 25 and 65 weight percent anhydrous ammonia and between 35 and 75 weight percent alkali metal thiocyanate component consisting essentially of at least 65 weight percent sodium thiocyanate (NaCNS) and at least 5 weight percent of at least one of potassium thiocyanate (KCNS), rubidium thiocyanate (RbCNS) and cesium thiocyanate (CsCNS).
Apparatus for thermal compression of NH.sub.3 vapor from a low pressure in the range of 0.5 to 2 ATA to a higher pressure having a saturation temperature at least about 60.degree. C. higher than the saturation temperature of the low pressure, comprising:
- (a) a generator including means for heating;
- (b) an absorber including means for cooling;
- (c) an absorbent circulation circuit communicating with said absorber and generator, comprised of a pump, a heat exchanger and a means for pressure reduction;
- (d) a liquid absorbent solution in said circuit comprising between 25 and 65 weight percent anhydrous ammonia and between 35 and 75 weight percent alkali metal thiocyanate component consisting essentially of at least 65 weight percent NaCNS and at least 5 weight percent of at least one of KCNS, RbCNS and CsCNS;
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- (e) a means for supplying said low pressure vapor to said absorber and withdrawing said higher pressure vapor from said generator.
An anhydrous liquid absorbent for the vapor of at least one of ammonia and monomethylamine (MMA) comprised of comprising between 25 and 65 weight percent of ammonia, MMA or a mixture thereof and between 35 and 75 weight percent of a thiocyanate salt component consisting essentially of at least 65 weight percent NaCNS and at least 5 weight percent of at least one of KCNS, RbCNS and CsCNS.
Dependencies are inferred from the claim text.