Drying: agents for

Aluminium oxide. The commercial material, activated alumina, is made from aluminium hydroxide it will absorb 15-20 per cent, of its weight of water, can be re-activated by heating at 175° for about seven hours, and does not appreciably deteriorate with repeated use. Its main application is as a drying agent for desiccators. 

Absorbent cotton (cotton wool). This material is an excellent drying agent for use in the so-called calcium chloride tubes, i.e., drying tubes, placed at the top of dropping funnels, reflux condensers, etc., to exclude moisture. It is more convenient than calcium chloride, and should preferably be dried in an oven at 100° before use. 

Magnesium methylate is used as a drying agent for alcohols and other organic solvents and as an intermediate in various manufacturing processes, eg, for organomagnesium compounds (79), orthocarbonic esters (80), and for oxide coatings. 

Magnesium ethylate is used as a drying agent for organic solvents, as an intermediate for the manufacture of organomagnesium and other organic products, as catalyst in the Tishchenko (85) and other reactions (86—91), in the condensation of esters (92), in alkylation reactions, and in polymeri2ations (84,91). 

DRYING AGENTS FOR CLASSES OF COMPOUNDS Dried with... 

Y. Pico, J. J. Vreuls, R. T. Ghijsen and U. A. Th Brinkman, Drying agents for- water-free intr-oduction of desorption solvent into a GC after on-line SPE of aqueous samples , Chromatogmphia 38 461-469 (1994). 

Perchlor and trichlor are used as metal degreasing agents and as solvents in dry cleaning. Perchlor is also used as a cleaning and drying agent for electronic equipment and as a fumigant. 

Fisher Scientific Company (reagent-grade) or Matheson Coleman and Bell. The first two were slightly yellow, and the latter was colorless however, the yields of final product were identical with each brand. The excess thionyl chloride serves as a drying agent for the hexanoic acid and as a solvent for the IV-bromosuecinimide, which is not very soluble in carbon tetrachloride. 

Linolenic acid is also important industrially it is the major constituent of linseed oil (approximately 47%) which is obtained from flax. The high degree of unsaturation present in this acid makes the oil an excellent drying agent for use in paints, varnishes and inks. 

Tabi.e II, 39. CojraiON Drying Agents for Organic Compounds... 

Lubricant for capsules and tablets, viscosity-imparting agent, drying agent for powder... 

This great affinity for water gives rise to the use of metal hydrides as drying agents for removing the last traces of water from organic liquids (that do not contain OH bonds). Calcium hydride, CaH2, is commonly used for this purpose. 

DEG and TEG are used as solvents for cellulose acetate derivatives and dyestuffs and as drying agents for refinery gases. 

Drying agent for presurgical and postsurgical removal of warts or tor Histofreezer treatment of warts where dryness is required. Safeguards against offensive odor and dries excessive moisture of feet. 

Magnesium perchlorate is a drying agent for gases and also an oxidizing agent. 

Carbon Tetrachloride. Put 30-40 g of anhydrous calcium chloride into the flask of an apparatus for distilling liquids (see Fig. 20) and pour in 0.5 litre of carbon tetrachloride. Hold the carbon tetrachloride over the drying agent for one day, then distil it off into a dry receiver. 

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