Method for preparing sodium hexafluoroantimonate

A technology of sodium hexafluoroantimonate and sodium antimonate, applied in antimonate/antimonite and other directions, can solve problems such as long process, and achieve the effects of low comprehensive cost and easy control of stoichiometry

Inactive Publication Date: 2006-03-08
CENT SOUTH UNIV
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Problems solved by technology

[0004] 1) In the preparation process, it is necessary to prepare the intermediate product hexafluoroantimonic acid or antimony pentafluoride first, and the process is relatively long

Method used

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  • Method for preparing sodium hexafluoroantimonate

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Embodiment

[0028] Embodiment: industrial secondary sodium antimonate, its main component (%) is: Sb 48.39%, Sb 3+ 0.18, Fe 0.0126, Na 2 O 12.48, crystal water 21.49. Industrial grade hydrofluoric acid, its main components (%) are: HF≥55%, H 2 SiF 6 ≤0.4, non-volatile acid (as H 2 SO 4 Count) ≤ 0.05, Fe ≤ 0.01.

[0029] Put 50kg of industrial sodium antimonate of the above ingredients into a reaction kettle lined with polytetrafluoroethylene, then add 65kg of industrial hydrofluoric acid of the above ingredients, add 300ml of hydrogen peroxide, start stirring, and heat the reaction kettle until the reaction temperature is 95°C , keep warm for 0.5 hours, stop stirring, and cool. Put the reacted material into a plastic storage tank for clarification, and put the supernatant into a plastic filter barrel for natural filtration. The filtrate was put into a concentration kettle, and was indirectly heated to 125°C for concentration. When concentrated to a specific gravity of 1.8, discha...

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Abstract

This method relates to the preparation of fine chemicals in chemical industry, especially the method for the preparation of sodium hexafluoroantimonate(Na3SbF6) with sodium antimonate(Na3SbO4) as raw material, which is as follow: first, after reaction between Na3SbO4 and fluohydric acid in proportion of 1: 6.6~9.5 under 50-100 degree C, filtrate to remove insoluble residue and condense the filter liquor under 95~136 deg.c; then cool, crystallization and centrifugal separation to obtain the product Na3SbF6, then the mother liquor is returned for recondensation. Advantages: directly product Na3SbF6 to save the preparation if the intermediate product of H3SbF6 or SbF5, easy and accurate control to stoichiometry of sodium and antimony; lower comprehensive cost.

Description

technical field [0001] The invention relates to the preparation of fine chemicals in the chemical industry, in particular to a method for preparing sodium hexafluoroantimonate from sodium antimonate as a raw material. Background technique [0002] The traditional preparation method of sodium hexafluoroantimonate is to prepare hexafluoroantimonic acid first, and then quantitatively react hexafluoroantimonic acid with sodium hydroxide or sodium carbonate to obtain sodium hexafluoroantimonate. And hexafluoroantimonic acid can be prepared by dissolving newly prepared antimony pentoxide in hydrofluoric acid, or reacting with hydrofluoric acid after preparing antimony pentafluoride first. Another method is to dissolve sodium fluoride in hydrofluoric acid, and then add stoichiometric antimony pentafluoride therein (see editorial committee of "Encyclopedia of Chemical Engineering", edited by the editorial department of "Encyclopedia of Chemical Industry" of Chemical Industry Press, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G30/02
Inventor 杨天足刘伟锋江名喜赖琼琳谢兆凤楚广
Owner CENT SOUTH UNIV
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