Drying
121Oil drying agent — An oil drying agent is a coordination compound that accelerates (catalyzes) the hardening of drying oils through chemical crosslinking. The catalysts affect the autoxidation of the oils with air. Typical oil drying agents are derived from cobalt …
122Supercritical drying — (red arrow) goes beyond the critical point of the working fluid in order to avoid the direct liquid–gas transition seen in ordinary drying (green arrow) or the two phase changes in freeze drying (blue arrow). Supercritical drying is a process to… …
123Convectant drying — has emerged in the last few years as an alternative to conventional drying techniques. Convectant drying is an “open system” incorporating heat and air movement to provide positive air pressure with high heat and therefore low relative humidity.… …
124Drum drying — is a method used for drying out liquids; for example, milk is applied as a thin film to the surface of a heated drum, and the dried milk solids are then scraped off with a knife. Powdered milk made by drum drying tends to have a cooked flavor,… …
125Abderhalden's drying pistol — Abderhalden s drying pistol. Note the inner barrel (to be connected to the vacuum source), and the outer barrel connected to the pot. The condenser is not attached. Abderhalden s drying pistol is a piece of laboratory glassware used to free… …
126Semi-drying oil — A semi drying oil is an oil which partially hardens when it is exposed to air. This is as opposed to a to drying oil, which hardens completely, or a non drying oil, which does not harden at all. Oils with an iodine number of 115 130 are… …
127Non-drying oil — A non drying oil is an oil which does not harden when it is exposed to air. This is as opposed to a to drying oil, which hardens completely, or a semi drying oil, which partially hardens. Oils with an iodine number of less than 115 are considered …
128Freeze-drying — Freeze dry Freeze dry (fr[=e]z dr[imac] ), v. t. [imp. & p. p. {Freeze dried}; p. pr. & vb. n. {Freeze drying}.] to remove the moisture from (e.g. food) by first freezing and then subjecting to a high vacuum; used as a mild method for drying… …
