Fluorides boric oxide

The usual method of preparing boron trifluoride from calcium fluoride, boric oxide, and sulfuric acid is unsatisfactory, since yields are low, much silicon fluoride contaminates the product, and a solid residue which is difficult to remove remains in the generator. 

Enamels - [BARIUMCOMPOUNDS] (Vol3) - [ALUMINUMCOMPOUNDS - ALUMINIUMOXIDE(ALUMINA) - CALCINED,TABULAR, AND ALUMINATE CEMENTS] (Vol2) - [TIN COMPOUNDS] (Vol 24) -aluminum fluoride in [FLUORINE COMPOUNDS,INORGANIC - ALUMINUM](Vol 11) -antimony compds in [ANTIMONY COMPOUNDS] (Vol 3) -borate in [BORON COMPOUNDS - BORON OXIDES, BORIC ACID AND BORATES] (Vol 4) -boric oxide in prepn of [BORON COMPOUNDS - BORON OXIDES, BORIC ACID AND BORATES] (Vo 14) -lithium for [LITHIUM AND LITHIUM COMPOUNDS] (Vol 15)... 

Using sodium fluoborate or ammonium fluoborate,1 boric oxide, and sulfuric acid, the yields are good, little silicon fluoride is produced, and the residue is water soluble. 

Stopcock D is opened, and the system is evacuated then stopcock D is closed so that the boron fluoride will be forced to bubble through the wash bottle E which contains concentrated sulfuric acid saturated cold with boric oxide to remove hydrofluoric acid and moisture which escapes from the flask and condenser C. 

Boric oxide is reported to be an effective fire retardant in engineering plastics such as polyphenylene ether (PPE)/high impact polystyrene (HIPS), polyetherketone, and polyetherimide.34-35 It is particularly effective when used in conjunction with PTFE or polyvinylidene fluoride. The use of boric oxide in conjunction with red phosphorus was reported to be an effective combination in fiberglass reinforced polyamide 6,6.36... 

Commercial boron fluoride from a tank is passed through a saturated solution of boric oxide in concentrated sulfuric acid. 

By fusing cobalt chloride with potassium hydrogen fluoride and boric oxide, two borates have been obtained, namely, 2CoO.B203 and 3CoO.B2Os, the latter as rose-coloured rhombic crystals.7... 

On fusing nickel chloride or carbonate with molecular proportions of potassium hydrogen fluoride and boric oxide, green prisms of SXi0.1L03 are obtained.3 They are not attacked by hot water, but dissolve in acids. 

Boron forms strong bonds to fluorine (644kJmol ), usually combining with three or four fluorides in its compounds or salts. Several binary fluorides of boron are known including boron trifluoride, BF3, a stable gas of great industrial importance as a Lewis acid. Boron trifluoride is synthesized industrially by reaction of hydrofluoric acid with borates or boric oxides (equation 42). ... 

Sodium borate Titanates Inorganic ceramic Boric oxide Silica Alumina Calcium fluoride Metal Silver Nickel Gold Tantalum Indium/lead ... 

With few exceptions, the common fluxes used in analysis are compounds of the alkali metals. Alkali metal carbonates, hydroxides, peroxides, and borates are basic fluxes used to attack acidic materials. The acidic fluxes are pyrosulfates, acid fluorides, and boric oxide. If an oxidizing flux is required, sodium peroxide can be used. As an alternative, small quantities of the alkali nitrates or chlorates can be mixed with sodium carbonate. 

BORON FLUORIDE (7637-07-2) BF3 Noncombustible gas. A powerful oxidizer. Reacts with moist air, water, or steam, producing hydrogen fluoride boric acid and fluoboric acid. Reacts violently with reducing agents, including hydrides, nitrides. 

The generating flask A has a volume of 500 ml. The test tubes P, C, and D are 25 X 200 mm. B is empty and used as a trap C contains some 30 ml of sulfuric acid saturated with boric acid, to absorb hydrogen fluoride from the gas stream. In A, place the entire product of ammonium fluoborate, well mixed with 6 grams of finely powdered boric oxide. In D, place 30 ml of diethyl ether, and cool the tube in ice. Arrange for the gas passing out of D to be sucked away by the draft or to be absorbed in caustic soda as in Experiment 1. 

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