Pentachloride pentoxide

Niobium Pent chloride. Niobium pentachloride can be prepared in a variety of ways but most easily by direct chlorination of niobium metal. The reaction takes place at 300—350°C. Chlorination of a niobium pentoxide—carbon mixture also yields the pentachloride however, generally the latter is contaminated with niobium oxide trichloride. The pentachloride is a lemon-yeUow crystalline soHd that melts to a red-orange Hquid and hydrolyzes readily to hydrochloric acid and niobic acid. It is soluble in concentrated hydrochloric and sulfuric acids, sulfur monochloride, and many organic solvents. 

Heating a mixture of anhydrous phosphoms pentoxide [1314-56-3] and phosphoms pentachloride produces phosphoms oxychloride. Use of expensive phosphoms pentachloride is obviated by using a mixture of the trichloride and chlorine with the pentoxide. Thus, a manufacturing method consists of the chlorination reaction of the trichloride with the pentoxide ... 

Tantalum. Numerous methods developed to extract tantalum metal from compounds included the reduction of the oxide with carbon or calcium the reduction of the pentachloride with magnesium, sodium, or hydrogen and the thermal dissociation of the pentachloride (30). The only processes that ever achieved commercial significance are the electrochemical reduction of tantalum pentoxide in molten K TaF /KF/KCl mixtures and the reduction of K TaF with sodium. 

Hazards of Tantalum Compounds. The toxicity of tantalum compounds depends on then solubihty. Tantalum pentoxide is poorly absorbed and nontoxic perorahy. The pentachloride, on the other hand, shows an LD q of 985 mg/Kg adrninistered peroraHy. 

Phosphorus compounds (phosphoric acid, phosphorous pentoxide, phosphorous oxychloride, phosphorous pentachloride, phosphorous pentasulphide)... 

Phosphorus pentoxide has been used as dehydrating agent but the pentachloride method is much superior. With the pent-oxide method there is always trouble due to the formation of a black, sticky mass which swells up during the latter part of the experimentand often disrupts the apparatus. 

Phosphorus pentachloride, 79 40, 42-44 end use of chlorine, 6 135t sodium reactions with, 22 766 Phosphorus pentafluoride, 79 33 Phosphorus pentahalides, 79 31-33 Phosphorus pentoxide, 79 49, 69. See also Phosphorus(V) oxides as cellulose solvent, 77 272 in hydrogen fluoride manufacture, 74 11 vapor of, 79 49... 

Tantalum oxide film, 24 314 Tantalum oxides, 24 322, 334 Tantalum pentachloride, 24 335 Tantalum pentafluoride, 24 334-335 Tantalum pentoxide, electrochemical reduction of, 24 322 Tantalum powder, 24 323, 324-325 capacitor-grade, 24 326 safety of, 24 333-334 Tantalum products, world shipments of, 24 331t... 

Styrylphosphonic dichloride has been prepared by the addition of phosphorus pentachloride to styrene with subsequent reaction of the adduct with phosphorus pentoxide or sulfur dioxide. ... 

Phosphoms trichloride is manufactured by loading liquid phosphoms into a jacketed batch reactor. Chlorine is bubbled through the liquid, and phosphoms trichloride is refluxed until aU the phosphoms is consumed. Cooling water is used in the reactor jacket and care is taken to avoid an excess of chlorine and the resulting formation of phosphoms pentachloride. Phosphoms oxychloride is manufactured by the reaction of phosphoms trichloride, chlorine, and solid phosphoms pentaoxide in a batch operation. Liquid phosphoms trichloride is loaded to the reactor, solid phosphoms pentoxide added, and chlorine bubbled through the mixture. Steam is... 

Payne MP, Shillaker RO, Wilson AJ Phosphoric acid, phosphorus pentoxide, phosphorus oxychloride, phosphorous pentachloride, phosphorus pentasulphide. HSE Toxicity Rev 30 1-22, 1993... 

The pentachloride also may be made by chlorination of niobium pentoxide in the presence of carbon at 300°C. The products, however, contain small amounts of niobium oxide trichloride, NbOCls. 

Tantalum pentachloride is hydrolyzed by water to form hydrous tantalum pentoxide, Ta205 uH20 and hydrochloric acid ... 

Antimony Pentachloride Antimony Pentafluoride Antimony Pentasulfide Antimony Pentoxide Antimony Trichloride Antimony Trioxide Antimony Trisulfide Argon... 

Ilosvay) by the action of hydrogen chloride on iodic acid (G. S. Serullas) of phosphorus pentachloride on iodine pentoxide (0. Brenkn) of iodine on sulphuryl chloride in excess (0. Ruff) 3S02Cl2+l2=2ICl3+3S02 and by heating iodine monochloride. 

The pentachlorides have been prepared by a variety of methods,2,3 chief of which are the direct chlorination of the metal and the action of chlorinating agents on the pentoxides. 

Phenyl iso-thiocyanate, 642,643 Phenylthioureas, 422, 655 Phenylurea, 644, 645 Phenylurethanos, 264 Phloroacetophenone, 727, 736 Phosgene, 185 Phosphoric acid, 189, 284 Phosphorus, detection of, 1043 Phosphorus, red, purification of, 193 Phosphorus oxychloride, 367 Phosphorus pentabromide, 489, 492 Phosphorus pentachloride, 799, 822, 974 Phosphorus pentoxide, handling of, 407 Phosphorus tribromide, 189, 492 Phosphorus trichloride, 367 Phosphorus trisulphide," 836 Phthalamide, 983 Phthalein test, 681 ... 

When chlorosulphonic acid is dehydrated by the action of phosphorus pentoxide 3 or pentachloride,4 pyrosulphury 1 chloride is obtained ... 

With sulphuric acid and phosphorus pentachloride, respectively, fuming sulphuric acid and pyrosulphuryl chloride are obtained 7 in the latter case the effect is one of dehydration, and a similar result is producible with phosphorus pentoxide 8... 

Niobium pentoxide has been reduced to the metal by means of hydrogen at 7 atmospheres pressure and at 1910° C.,1 and a fairly pure sample has been obtained by the action of hydrogen on niobium pentachloride at a red heat.2... 

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