Desiccant

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desiccant

[′des·i·kənt]
(chemistry)

Desiccant

 

(or drying agent), a liquid or solid that takes up moisture, used for drying gases, liquids and, more rarely, solids. Desiccants are divided into three major groups: (1) water-adsorbing desiccants, (2) desiccants that form hydrates with water, and (3) desiccants that form other chemical compounds with water. The first group includes aluminum oxide, silica gel, and other adsorbents; the second group comprises certain anhydrous salts and fused hydroxides; and the third group includes metallic sodium and calcium, calcium oxide, and phosphorus pentoxide. The state of aggregation of the substance to be dried, the moisture content of the substance, and the drying conditions determine the selection of a particular desiccant. It is absolutely essential that the desiccant does not react with the substance to be dried.

desiccant

Any absorbent or adsorbent, liquid or solid, that will remove water or water vapor from a material. In a refrigeration circuit, the desiccant should be insoluble in the refrigerant.
References in periodicals archive ?
Units utilize dual dessicant beds, dewpoint - controlled bed switching and closed - loop cooldown, allowing for continuous low dewpoints operation.
The addition of the dessicant did not affect the % volume change in the peroxide cured compounds.
Other features include short 1-2 hr start-ups for quicker material changes; lifetime dessicant, which eliminates replacement, bad product produced by wornout beds, and costly downtime; and standard high-quality stainless-steel drying hopper, after-cooler, and microprocessor control.
Dewpoint of dehumidified air from regenerated dessicant cells is -40 to -45 C.
The next set of chapters discuss markets and uses, covering such topics as absorbents and dessicants, construction uses, cosmetics, electronic and optical materials, environmental uses, fertilizers, filters and process aids, ceramic products, glasses, metallurgical uses, nanomaterials, pigments, refractories, soil amendments, and well drilling materials.
What is the purpose of dessicants, such as silica gel?
This can be accomplished through a combination of nitrogen flushing, oxygen absorbers, vacu um packing and dessicants.
Another ICI Klea team studied the use of molecular sieve dessicants with HFCs, while a team from Lubrizol Corp.
Triangle Park, North Carolina, and three collaborators from the nearby National Risk Management Research Laboratory tested 11 elastomers, five metals, four plastics and four dessicants for compatibility with five HFCs - 245ca, 245fa, 125, 236ea and 236fa.
reported tests on the effects of various additives to POEs - antiwear, hydrolysis inhibitors, dessicants.