Drying before

When boring rubber stoppers, lubricate the borer well, either with aqueous glycerine or with vaseline. Then clean well and dry before using. 

All glassware should be scrupulously clean and, for most purposes, dry before being employed in preparative work in the laboratory. It is well to develop the habit of cleaning all glass apparatus immediately after use the nature of the dirt will, in general, be known at the time, and, furthermore, the cleaning process becomes more difficult if the dirty apparatus is allowed to stand for any considerable period, particularly if volatile solvents have evaporated in the meantime. 

Chloroform. 61° ably be dried before use. Non-inflammable vapour toxic. 

Unless the material is at least partly dried before hydrolysis, the yield of hydrochloride is reduced because of its solubility. If pure 3-broino-4-acetamino-toluene is required, the crude material may be recrystallised from 50 per cent, alcohol with the addition of a little decolourising carbon it separates as colourless needles, m.p. 116-117 (180 g.). 

If objective is to recover adsorbed components (free of water vapor), inlet gas stream should be dried before molecular sieve adsorption process occurs (water adsorption on mol sieves is particularly strong because of polarity of surface). 

The analyses can be carried out in the presence of /V-methy1o1 groups. On fabric, the formaldehyde bisulfite compound is decomposed by excess sodium carbonate and the Hberated sulfite is titrated with 0.1- or 0.01-N iodine solution (76). Commercial fabrics are seldom washed and dried before being used, and the free formaldehyde content may be between 50 and several hundred ppm, depending on finishing and storage conditions. 

Chemical Precipitation. The product of the extraction processes, whether derived from acid or carbonate leach, is a purified uranium solution that may or may not have been upgraded by ion exchange or solvent extraction. The uranium ia such a solution is concentrated by precipitation and must be dried before shipment. Solutions resulting from carbonate leaching are usually precipitated directly from clarified leach Hquors with caustic soda without a concentration step, as shown ia equation 9. 

The dark filtrate from the hydrochloride does not contain enough dissolved salt to justify recovery unless the acetamino compound was insufficiently dried before the hydrolysis. 

Dried with Linde type 5A molecular sieves or Na2S04 and fractionally distd at reduced pressure. Alternatively, it was refluxed with, and distd from, BaO. Also purified by fractional crystn from the melt and distd from zinc dust. Converted to its phosphate (m 135°) or picrate (m 223°), which were purified by crystn and the free base recovered and distd. [Packer, Vaughn and Wong J Am Chem Soc 80 905 1958.] The procedure for purifying via the picrate comprises the addition of quinoline to picric acid dissolved in the minimum volume of 95% EtOH to yield yellow crystals which are washed with EtOH and air dried before recrystn from acetonitrile. The crystals are dissolved in dimethyl sulfoxide (previously dried over 4A molecular sieves) and passed through a basic alumina column, on which picric acid is adsorbed. The free base in the effluent is extracted with n-pentane and distd under vacuum. Traces of solvent are removed by vapour phase chromatography. [Mooman and Anton J Phys Chem 80 2243 1976.]... 

Crystd twice from warm water, by cooling. Air dried, then oven dried overnight at 130°. Hygroscopic should be dried before use. 

The dioxane was dried before use by distillation from calcium hydride. 

Wood particle and fiber driers are used to dry the raw material for particleboard and similar products (20). Just as with the veneer for plywood, the parhcles must be dried before being mixed with the resins and formed into board. Drying is accomplished in a gas-fired drier, a direct wood-fired drier, or steam coil driers. Many different types of driers are used in the industry. Emissions are fine particles and condensible hydrocarbons, which produce... 

In taking the melting point of this compound there was still some solid remaining at 200°. The crude imide is satisfactory for conversion to /3-ethyl-/3-methylglutaric acid and need not be dried before hydrolysis. 

The funnel is dried before use with a flame and is then closed with a drying tube and allowed to cool. 

A variation of this process uses an emulsified bitumen product that is miscible with a wet sludge. In this process, the mixing can be performed at any convenient temperature below the boiling point of the mixture. The overall mass must still be heated and dried before it is suitable for disposal. Ratios of emulsions to waste of 1 1 to 1 1.5 are necessary for adequate incorporation. 

Repeated chromatography of the sample in the same direction with the chromatographic plate being dried before all re-developments. 

Carbon tetrachloride is dried over calcium chloride and distilled before use. Triphenylphosphine is dried by dissolving it in dry benzene, removing the solvent under vacuum, and storing over phosphorus pentoxide. Alcohols should also be dried before use. 

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