Sodium bifluoride

Sodium has two fluorides, sodium fluoride [7722-88-5] and sodium bifluoride [1333-83-1]. 

Both sodium fluoride and sodium bifluoride are poisonous if taken internally. Dust inhalation and skin or eye contact may cause irritation of the skin, eyes, or respiratory tract, and should be avoided by the use of proper protective equipment (1). 

Sodium bifluoride, by itself or ia conjunction with other materials, is a good laundry sour because, ia the concentrations used, it does not create a pH below 4.0 and thus causes no damage to textile fibers, although it removes iron stains. Leather (qv) bleaching and cleaning of stone and brick building faces are other uses for this material (3). 

The spent hydrogen fluoride layer, which contains water and sodium bifluoride, from this process is treated with sulfur trioxide or 65% oleum, and hydrogen fluoride is distilled for recycle to the next batch (176,177). 

SODIUM AZIDE SODIUM BICHROMATE SODIUM BIFLUORIDE SODIUM BISULFATE SODIUM BISULFIDE... 

Fluoroaromatics are now produced m 75-90% yields on an industrial scale by this method The nonorganic layer containing water, hydrogen fluoride, and sodium bifluoride is treated with sulfur trioxide, and anhydrous hydrogen fluoride is recycled by distillation [54 (equation 13)... 

Excess HF, however, yields sodium bifluoride, NaHF2 ... 

Sodium fluoride is prepared by adding sodium hydroxide or sodium carbonate to a 40% solution of hydrofluoric acid. In excess hydrofluoric acid, sodium bifluoride, NaHF2, is formed. NaF also is made by fusion of cryohte with caustic soda. Technical grade products are usually sold at 90 to 95% purity. 

The acidic form of sodium fluoride, sodium bifluoride is scarcely used for introduction of fluorine in organic compounds. One reported example is the addition of bromofluorine to perfluoro(2-methylpent-2-ene) (20) generated by reacting A V -dibromodimethylhydantoin with acidic sodium fluoride in the presence of tetrabutylammonium hydrogen difluoride at 0°C to give 21.20... 

Ingredients % bv Weight Aerosol OS Surfactant 10.0 Sodium Bifluoride 75.0 Sodium Tetraphosphate 10.0 Sodium Bisulfite 15.0... 

Defluorinated Phosphate Rock. There is substantial production of defluorinated phosphate rock for fertilizer use in Japan (about 100,000 mt/year). Ground, high-grade rock is mixed with small proportions of sodium carbonate or sulfate and wet-process acid. The mixture is calcined at a temperature of 1350°C in an oil-fired rotary kiln 45.0 m in length and 2.7 m in diameter. The product contains 38-42 percent P205 of which more than 90 percent is soluble in neutral ammonium nitrate solution and is an effective fertilizer on acid soils. During the production of defluorinated phosphate rock, substantially all fluorine is driven off. Sodium bifluoride (NaHF2) is recovered as a byproduct. A similar product is made in the United States, but it is mainly used for animal feed supplement. 

X-ray diffraction photography (XRDP) of the K NiF j and CsjNiFs products in these syntheses showed that they were identical to the products of the thermal methods, each having the cubic antifluorite structure previously reported [ 12,20], The NajNiFe made in the present work was always contaminated with sodium bifluoride, and an XRDP confirmed that... 

SOur. (1) Any substance used in textile or laundry operations to neutralize residual alkali or decompose residual hypochlorite bleach. The commonly used sours are sodium bifluoride and sodium fluosi-licate. (2) Contaminated with sulfur compounds, e.g., gasoline or natural gas. (3) Taste characteristic... 

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