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Method for preparing sodium hydrogen selenite

A technology of sodium hydrogen selenite and sodium hydroxide, applied in chemical instruments and methods, selenium/tellurium compounds, inorganic chemistry, etc., can solve the problems of causing the greenhouse effect, danger to operators, etc., and achieve relaxed operating conditions and simple steps. , the effect of easy industrialization and application

Inactive Publication Date: 2009-01-14
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Sodium biselenite is all prepared by the sodium bicarbonate method at present, and this method is that selenous acid is joined in the sodium bicarbonate solution, and selenous acid and sodium bicarbonate react, thereby obtain sodium biselenite, Its preparation process can be expressed as: H 2 SeO 3 +NaHCO 3 =NaHSeO 3 +CO 2 +H 2 O, a large amount of carbon dioxide gas is generated during the preparation process, and the emission of carbon dioxide gas into the atmosphere will cause a greenhouse effect, and a large amount of carbon dioxide gas generated during production will bring danger to operators around the production equipment

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] Weigh 1.7kg of selenium dioxide and add it to 4L of water and stir evenly to obtain solution I; weigh 0.6128kg of sodium hydroxide, add it to the prepared solution I while stirring, add 0.001kg of absorbent silica gel at the same time, adjust PH=2 -9, to obtain solution II, press filter after stirring for 30 minutes; after press filter, the solution is moved to the evaporating kettle for heating, evaporation and dehydration; after evaporation and concentration, sodium biselenite crystals are produced in the solution; then centrifuged to obtain hydrogen selenite Sodium crystals, then move the sodium oxyselenite crystals to an oven, keep the temperature at 100-200°C for 1-6 hours, until drying; after drying, cool down to obtain the sodium hydrogen selenite product.

Embodiment 2

[0022] Weigh 1.11kg of selenium dioxide and add it to 2.6L of water, stir and dissolve to obtain solution I; weigh 0.4kg of sodium oxide, add it to the prepared solution I while stirring, and add 0.001kg of absorbent aluminum oxide at the same time to adjust the pH =2-9, obtain solution II, press filter after stirring and reacting for 20 minutes; After press filter, solution is moved to heating and evaporating dehydration in the evaporator; After evaporation and concentration, sodium biselenite crystals are produced in the solution; Sodium hydrogen selenate crystals, then move the sodium hydrogen selenite crystals to an oven and heat to 150°C for 3 hours to dry; after drying, cool down to obtain sodium hydrogen selenite products.

Embodiment 3

[0024] Weigh 0.89kg of selenium dioxide and add it to 2.1L of water, stir and dissolve to obtain solution I; weigh 0.32kg of sodium hydroxide, add it to the prepared solution I while stirring, add 0.001kg of absorbent molecular sieve at the same time, and adjust the pH= 2-9, to obtain solution II, stir and react for 35 minutes and press filter; after press filter, the solution is moved to an evaporator for heating, evaporating and dehydrating; after evaporation and concentration, sodium biselenite crystals are produced in the solution; and then centrifuged to obtain selenous Sodium hydrogen selenite crystals, then move the sodium hydrogen selenite crystals to an oven and heat to 180°C for 5 hours or until drying; after drying, cool down to obtain sodium hydrogen selenite products.

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Abstract

The invention relates to a sodium hydrogen selenite preparation method which includes the steps that: (1) the selenium dioxide is dissolved in water to generate solution I; (2) the sodium hydroxide is added to the solution I; the PH is adjusted to equal to 2-9, so as to obtain the solution II; (3) the solution II is evaporated, condensed and crystallized to obtain crystal water sodium hydrogen selenite; (4) the crystal water sodium hydrogen selenite is dried to obtain the sodium hydrogen selenite product. The sodium hydrogen selenite preparation method is a safe, efficient and environmental protection preparation process; the preparation adopts the selenium dioxide, water and sodium hydrate as the source materials to generate the sodium hydrogen selenite and water; and then the water is removed to obtain the target product. The sodium hydrogen selenite preparation method has the advantages of generating no other hazardous substance in the production process, simple steps, convenient operation condition, easy industrial popularization and application.

Description

technical field [0001] The invention relates to a preparation method of sodium hydrogen selenite. Background technique [0002] Sodium biselenite is a white crystal, which is highly toxic, and its molecular formula is NaHSeO 3 The molecular weight is 150.96 Da. Very easy to deliquescence, soluble in water, insoluble in alcohol. It decomposes at 100-230°C and produces sodium pyroselenate. The substance is mainly used for bacterial culture and isolation of Salmonella bacteria in medicine or laboratories, and can also be used as a raw material for drug production. Sodium biselenite has anti-oxidation and anti-cancer effects, and can be used to prepare anti-cancer and anti-oxidation drugs. Sodium biselenite can also be used as a glass additive in the glass production industry. [0003] Sodium biselenite is all prepared by the sodium bicarbonate method at present, and this method is that selenous acid is joined in the sodium bicarbonate solution, and selenous acid and sodium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00
Inventor 朱世会朱世明朱刘刘留
Owner FIRST RARE MATERIALS CO LTD
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