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Thus iodide is the best leaving group among the halides and fluoride the poorest.Так, среди галогенидов иодид — наилучшая уходящая группа, а фторид — наихудшая.Органическая химия. Реакции, механизмы и структура. Том 2Марч, Джерри© 1985 by John Wiley & Sons, Inc.© перевод на русский язык, «Мир», 1987March's advanced organic chemistry: reactions, mechanisms, and structureMarch, Jerry,Smith, Michael B.© 2007 by John Wiley & Sons, Inc.March, Jerry,Smith, Michael B. / March's advanced organic chemistry: reactions, mechanisms, and structureМарч, Джерри / Органическая химия. Реакции, механизмы и структура. Том 2
The isolated silicon in the form of suspension of silicon powder and electrolyte, which is the above mentioned eutectic melt of triple systems of fluoride salt of alkaline metals, is isolated from electrolyzer.
Silicon is produced by its reduction from silicon fluoride hydrogen acid by atomic hydrogen at room temperature.
However, local fluoride action cannot be traced on teeth enamel maturation (for people aging over 20) even under this condition. It is shown in loss of its efficiency in caries prophylaxis.
The solid electrolyte of these batteries is the composite fluoride based on lead fluoride with the additive of potassium fluoride.
The inventive method consists in electolytically decomposing a silicon tetrafluoride-saturated eutectic melt of a ternary system of alkali metal fluoride salts.
Suspension is produced from electrolyte, dissolved in anhydrous hydrogen fluoride, and silicon powder. This suspension is filtered with isolating of Si powder with the help of centrifugal machine 5.
Solution of electrolyte in HF, produced after filtration of silicon powder with the help of centrifugal machine 5, is directed to apparatus 11 where distillation of anhydrous hydrogen fluoride takes place at 500° C.
It tales place because bubbling makes it possible to saturate melted electrolyte with supreme fluoride of the initial element in gas phase.
The drawback of the aforesaid well-known batteries is their low energy parameters, which are associated with a low energy capacity of the interaction between the fluoride and lead in anode.
The produced salt is washed, dried and is decomposed by processing of concentrated mineral acid, and after the stage of decomposition the separation of the produced silicon tetrafluoride from anhydrous hydrogen fluoride is carried out.
After removing of the mentioned suspension, i.e. within electrolyzer, the isolation of silicon powder from eutectic melt of triple systems of fluoride salt of alkaline metal is carried out.
This current source consists of the Pb-based anode, the silver fluoride-based cathode and a fluorine-ion conducting electrolyte.
In particular, the solid-state current sources based on the solid-state fluoride ion conductors have a specific energy capacity (energy density) up to 1100 Wh/dm3.
There are ways of production of silicon tetrafluoride by its synthesis from silicon dioxide and fluorine containing reagents, e.g. natrium fluoride, anhydrous hydrogen fluoride, fluoride of lead, etc.
фторсодержащий пломбировочный цемент
hydrogen fluoride extraction
экстракционная очистка жидким фтористым водородом
lithium fluoride dosimeter
фтористо-литиевый термолюминесцентный дозиметр