Using a Drying Agent

Put the liquid or solution to be dried into an Erlenmeyer flask. 

Add small amounts of drying agent and swirl the liquid. When the liquid is no longer cloudy, the water is gone, and the liquid is dry. 

Add just a bit more drying agent and swirl one final time. 

If you ve used a carrier solvent, then evaporate or distill it off, whichever is appropriate. Then you ll have your clean, dry product. 

Add the drying agent slowly to the product in small amounts 

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Decalin is very easy to dry but it forms peroxides on prolonged contact with air so it is advisable to use a drying agent which will reduce the peroxides. 

Using a drying agent in a closed container to absorb the solvent. 

Typical Drying Agents Using a Drying Agent... 

Again, the stereochemistry at C-l is ensured by participation from the 2-position. This reaction has been most extensively reviewed.1,8-14 An obvious disadvantage is that water is a product. This can be circumvented by using a drying agent in the reaction mixture. 

An organic synthesis requires 50 mL of anhydrous ethanol as a solvent. Only 95 % ethanol is available. Removing the water by storing over molecular sieves or using a drying agent such as anhydrous sodium sulfate is not considered economical because too much water is present and time is short. An azeotropic distillation is decided upon. You get 150 mL of 95% ethanol and prepare the desired product. 

Products and Uses A drying agent, thickener, and suspension for various products in paints, adhesives, varnishes, putty, printing inks, soaps, and pharmaceutical items. Useful as a drying agent, thickener, and suspension for various products. 

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. 

It is less well known, but certainly no less important, that even with carbon dioxide as a drying agent, the supercritical drying conditions can also affect the properties of a product. Eor example, in the preparation of titania aerogels, temperature, pressure, the use of either Hquid or supercritical CO2, and the drying duration have all been shown to affect the surface area, pore volume, and pore size distributions of both the as-dried and calcined materials (34,35). The specific effect of using either Hquid or supercritical CO2 is shown in Eigure 3 as an iHustration (36). 

By-product water formed in the methanation reactions is condensed by either refrigeration or compression and cooling. The remaining product gas, principally methane, is compressed to desired pipeline pressures of 3.4—6.9 MPa (500—1000 psi). Einal traces of water are absorbed on siHca gel or molecular sieves, or removed by a drying agent such as sulfuric acid, H2SO4. Other desiccants maybe used, such as activated alumina, diethylene glycol, or concentrated solutions of calcium chloride (see Desiccants). 

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). 

The original flask used for the enamine formation can be used after the attachment of a Y-shape tube fitted with a dropping funnel and a reflux condenser protected with a tube packed with a drying agent such as anhydrous calcium chloride. 

N. Y., 3rd edn, 1970]. Acetone was shaken with Drierite (25g/L) for several hours before it was decanted and distd from fresh Drierite (lOg/L) through an efficient column, maintaining atmospheric contact through a Drierite drying tube. The equilibrium water content is about lO M. Anhydrous Mg(C104)2 should not be used as drying agent because of the risk of EXPLOSION with acetone vapour. 

The checkers purchased trifluoroacetic acid from Aldrich Chemical Company, Inc., and distilled it from phosphorous pentoxide. The submitters point out that some trifluoroacetic anhydride, whose effects have not been fully investigated, is obtained under these conditions. The submitters prefer to use trifluoroacetic acid which has been distilled through a glass packed column without the use of a drying agent. 

As well as testing the reactants, as described in Section 22.1, we should also test auxiliary materials. For example, nitrogen trifluoride reacted with silica, which was used as a drying agent. Whenever a new batch of silica was installed, there was a rise in temperature, which the operators never reported and in time accepted as normal. They were walking along the precipice described in Section 22.1, and one day the temperature rise got out of control. 

Calcium sulfate, CaS04> is used as a drying agent and sold under the trade name Drierite. For the reaction... 

Uses.. Anhyd Mg perchlorate has found widespread use as a drying agent under the trade names Anhydrone and Dehydrite. This use has been reviewed in a book by G.F. Smith (Ref 6). 

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