Nitrogen, drying with phosphorus

Tank nitrogen was dried with phosphorus pentoxide. 

Rice and Getz J made a very complete study of the matter from this point of view. At 65° C. they found k = 0-286, compared with the value 0-292 of Daniels and Johnston. In order to test the possibility that the reaction might depend on catalysis by dust, they compared the velocity constants for filtered and unfiltered nitrogen pentoxide and for gas which had been passed through an electrical dust precipitator. In some experiments the gas was dried with phosphorus pentoxide, in others not. In some it was prepared by the dehydration of nitric acid with phosphorus pentoxide and in others by the action of chlorine on silver nitrate. Nitric acid was found to have no catalytic effect on the decomposition. Some of the principal results are summarized below, all data referring to 65° C. 

Preparation of Sodium Bisulphide. Assemble an apparatus as shown in Fig. 66. Fill drying columns 4 with. phosphorus(V) oxide placed on glass wool. Weigh 2-2.5 g of metallic sodium, wash it with benzene and diethyl ether, thoroughly remove the oxide film from its surface, cut the sodium up into small pieces, and put them into test tube 2. Pour 75 ml of absolute ethanol into 150-200-ml round-bottomed flask 1. Fill the apparatus with dry argon (nitrogen) via tube 3. 

AnalaR bromine, which has been dried over phosphorus-(Y) oxide, is placed in flask A (see Fig. 3) and pellets of gallium (10 g.) are dropped into tube B which is then sealed at point 1. The apparatus, previously dried by flaming it under vacuum, is swept out with dry nitrogen and the gas is then passed through a sintered-glass bubbler under the bromine at a rate which is adjusted to give rapid reaction in tube B, though the flow rate should not be so fast that... 

Bis[triphenylphosphanc] bis-[2-thiopheneteUuroIato]dlpalladium3 Under nitrogen, 1.15 g (1 mmol) of tctrakis[triphenylphosphane]palladium are dissolved in 50 ml of anhydrous benzene, a benzene solution of 0.42 g (1 mmol) of bis[2-thicnyl] ditellurium is added, the mixture is stirred under nitrogen overnight, and then filtered. The brown solid is washed with diethyl ether and dried over phosphorus pentoxide under vacuum. Addition of hexane to the filtrate precipitated additional product. 

Phosphorus Thiotrifluoride or thiophosphoryl fluoride, PSFs, was first prepared by heating a mixture of phosphorus and sulphur with an excess of lead fluoride in a lead tube to 250° C. and leading over the mixture a current of dry nitrogen. The gas was purified by standing for about a day over dry lime. It was also prepared by heating arsenic trifluoride in a sealed tube with phosphorus thiotrichloride —4... 

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