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Potassium bifluoride

Potassium bifluoride, KE HE, is used as a raw material to charge the cells initially and for makeup when cells are rebuilt. A newly charged cell requires about 1400 kg KE HE. Overall consumption of KE HE per kilogram of fluorine generated is small. Gommercial-grade flake potassium bifluoride is acceptable. Its specifications are... [Pg.128]

The two stable salts of potassium and fluorine of commercial significance are the normal fluoride [7789-23-3] KF, and potassium bifluoride [7789-29-9] KHF2. [Pg.230]

Halogen exchange with KF is not successful ia acetic acid (10). Hydrogen bonding of the acid hydrogen with the fluoride ion was postulated to cause acetate substitution for the haUde however, the products of dissolved KF ia acetic acid are potassium acetate and potassium bifluoride (11). Thus KF acts as a base rather than as a fluorinating agent ia acetic acid. [Pg.230]

Manufacture. Commercial KF is manufactured from potassium hydroxide and hydrofluoric acid followed by drying ia a spray dryer or flaking from a heated dmm. The KF assay is typically 97—99% impurities are KF 2H20 and either potassium carbonate or potassium bifluoride. The 1992 price of... [Pg.230]

Properties. Other names for potassium bifluoride are potassium hydrogen difluoride and potassium acid fluoride. This white crystalline salt is a soft, waxy soHd. The crystal forms of potassium bifluoride are tetragonal and cubic (21). The bifluoride ion in KHF2 averages 0.2292 nm between fluoride... [Pg.230]

Preparation ofKF-2HF. This is prepared by carefully adding hydrogen fluoride vapor mixed with nitrogen to solid potassium bifluoride.13 Potassium bifluoride is available in convenient quantities from some supply houses (Aldrich 23,928-3, for example). The addition of hydrogen fluoride vapor to potassium fluoride is extremely exothermic and is best not attempted. The addition of liquid hydrogen fluoride to potassium bifluoride is also extremely exothermic and is best not attempted. [Pg.546]

Potassium bases, 20 604-605 Potassium benzoate, 3 632t, 633-634, 635 Potassium P-alumina, 2 406t Potassium bicarbonate, 20 632 Potassium bifluoride, 11 838 Potassium borohydride, 13 615, 620 production process for, 13 617 Potassium bromate, 4 334-335 20 630 Potassium bromide, 20 630... [Pg.750]

Fusion with a flux such as sodium hydroxide, potassium bifluoride potassium pyrosulphate has been used extensively in the water industry. [Pg.443]

Reaction with potassium bifluoride in the presence of hydrofluoric acid creates a stable complex fluoride, K2MnFe in which Mn is in +4 oxidation state ... [Pg.555]

Potassium fluoride is prepared by dissolving potassium carbonate in excess hydrofluoric acid. Evaporation of the solution forms crystals of potassium bifluoride. The bifluoride on heating yields potassium fluoride ... [Pg.754]

Potassium Bifluoride (Potassium Acid Fluoride), KHFa, mw 78.11 colorless, poisonous corrosive crysrs mp — decomp sol in w dil ale insol in abs ale. Can be prepd by crystallizing from an aq soln of KF in HF (Ref 1). Used for etching glass production of fluorine and of flux in metallurgy Rsfs ]) Gmel in-Kraut 3ysf Nunibcr 22(1937)... [Pg.528]

Preparation of Potassium Bifluoride. Perform the experiment in a fume cupboard, wear rubber gloves ). Pour 25 ml of a 40% hydrogen fluoride solution into a plati-... [Pg.108]

Fig. 63. Test tube for dehydrating potassium bifluoride in vacuum... Fig. 63. Test tube for dehydrating potassium bifluoride in vacuum...
Aliphatic fluorodenitration has also been applied to mononitro compounds, specifically to an a-nitroepoxide Thus, l,2-anhydro-3 4 5,6-di-O isopropyli dene-l-C-nitro D mannitol and labeled potassium bifluoride give 2-deoxy-2-fluo-ro-3,4 5,6-di-O-isopropylidene aldehydo D glucose [103,104] (equation 30)... [Pg.286]

A satisfactory electrolyte is made from anhydrous hydrofluoric acid and a technical grade of potassium acid fluoride. The use of a pure dry salt has only minor advantages, because electrolysis soon removes water and undesirable impurities. After melting 2 kg. of potassium bifluoride in... [Pg.143]

With the diaphragm in position, electrolysis is carried out using the monel-metal pot as the cathode. If the potassium bifluoride has been well purified, fluorine will be produced at the nickel electrode soon after the current starts to flow. If the source of electricity is a 110-volt direct-current line, a simple rheostat to allow the control of the current may be made from one 500- and two 1000-watt electric heater units. [Pg.144]

After the generator has been used a number of hours, one observes that the electrolyte does not become completely molten, even though the temperature is maintained at 75° or above for some time. The solid is potassium bifluoride and its appearance indicates that hydrogen fluoride should be bubbled into the solution until it again contains about 43.4 per cent hydrogen fluoride. The diaphragm itself makes a good bubbler. [Pg.145]

Fluorine (melting point -219.6°C, boiling point -188.4°C) is apale greenish-yellow reactive gas that occurs in combined form in fluorine-containing minerals such as fluorspar, fluorapatite, and cryolite. Fluorine is also produced by the electrolysis of potassium bifluoride (KHF2 or KF-HF) under varying conditions of temperature and electrolyte composition. [Pg.240]

Other substances. The concentrations of acids and bases and alkalis could be listed as follows acetic acid > 25% concentration, hydrochloric acid > 25% concentration, nitric acid > 20% concentration, chromic acid, hydrofluoric acid, perchloric acid > 10% concentration, sulfuric acid > 15% concentration, fuming sulfuric acid, ammonium hydroxide > 35% by weight of gas, potassium hydroxide (caustic potash), sodium hydroxide > 5% concentration, aluminum chloride, bromine, phosphorous trichloride, potassium bifluoride, sodium hypochlorite > 10% concentration, and zinc chloride. [Pg.9]

SYNS BIFLUORURE de POTASSIUM (FRENCH) HYDROGEN POTASSIUM FLUORIDE POTASSIUM BIFLUORIDE POTASSIUM BIFLUORIDE, soUd or solution pOTl POTASSIUM FLUORIDE POTASSIUM HYDROGEN DIFLUORIDE POTASSIUM HYDROGEN FLUORIDE POTASSIUM MONOHYDROGEN DIFLUORIDE... [Pg.1154]

SYNS POTASSIUM bifluoride, solution pOTl POTASSIUM HYDROGEN FLUORIDE, solution pop... [Pg.1154]

Ferric Chloride 7778-49-6 Potassium Citrate 7789-29-9 Potassium Bifluoride... [Pg.1092]

See other pages where Potassium bifluoride is mentioned: [Pg.230]    [Pg.231]    [Pg.336]    [Pg.241]    [Pg.546]    [Pg.76]    [Pg.53]    [Pg.689]    [Pg.303]    [Pg.552]    [Pg.411]    [Pg.802]    [Pg.25]    [Pg.144]    [Pg.180]    [Pg.241]    [Pg.1849]    [Pg.108]    [Pg.1026]   
See also in sourсe #XX -- [ Pg.53 ]

See also in sourсe #XX -- [ Pg.6 , Pg.145 ]

See also in sourсe #XX -- [ Pg.469 , Pg.470 ]

See also in sourсe #XX -- [ Pg.200 ]



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