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Preparation of potassium tellurite

A technology of potassium tellurite and tellurium dioxide, applied in chemical instruments and methods, selenium/tellurium compounds, inorganic chemistry, etc., can solve problems such as operator danger and greenhouse effect, and achieve simple steps, loose operating conditions, and easy The effect of industrialization promotion and application

Inactive Publication Date: 2009-01-21
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, potassium tellurite is prepared by the reaction of tellurium dioxide and potassium carbonate to produce potassium tellurite. The preparation process can be expressed as: TeO 2 +K 2 CO 3 =K 2 TeO 3 +CO 2 , 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 the 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
Comparison scheme
Effect test

Embodiment 1

[0012] Weigh 3.146kg of tellurium dioxide and add it to 5L of water, stir evenly to obtain solution I, then add 2.208kg of potassium hydroxide to solution I while stirring, and add 20g of absorbent silica gel after the reaction is completed to obtain solution II, after stirring for 10min Pressure filtration; after pressure filtration, move the solution to an evaporator for heating, evaporation and dehydration; after evaporation and concentration, potassium tellurite crystals are produced in the solution; and then centrifuged to obtain potassium tellurite crystals, and then the potassium tellurite crystals are moved to In an oven, dry at a constant temperature of 100°C; cool after drying to obtain potassium tellurite product.

Embodiment 2

[0014] Weigh 1.2kg of tellurium dioxide and add it to 1.9L of water, stir evenly to obtain solution I, then add 0.84kg of potassium hydroxide to solution I while stirring, and add 7.6g of absorbent aluminum oxide after the reaction is complete to obtain solution II. After stirring for 5 minutes, press filter; after press filter, move the solution to an evaporator for heating, evaporation and dehydration; after evaporation and concentration, potassium tellurite crystals are produced in the solution; The crystals are moved to an oven, and dried at a constant temperature of 150° C. for 1-6 hours; after drying, the potassium tellurite product is obtained by cooling.

Embodiment 3

[0016] Weigh 2.87kg tellurium dioxide and add it to 8L water, stir evenly to obtain solution I, then add 2.01kg potassium hydroxide to solution I while stirring, add 28g absorbent molecular sieve after the reaction is completed, obtain solution II, stir for 15min Pressure filtration; after pressure filtration, move the solution to an evaporator for heating, evaporation and dehydration; after evaporation and concentration, potassium tellurite crystals are produced in the solution; and then centrifuged to obtain potassium tellurite crystals, and then the potassium tellurite crystals are moved to In an oven, dry at a constant temperature of 80°C for 1-6 hours; cool after drying to obtain potassium tellurite product.

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Abstract

The invention relates to a method for preparing a composition, in particular to a method for preparing potassium tellurite. The method for preparing potassium tellurite comprises the following steps that: (1) tellurium dioxide is added in water and evenly stirred to obtain the solution(I); (2) potassium hydroxide is gradually added and dissolved in the solution(I) to obtain the solution(II); (3)the solution(II) is subjected to evaporation, condensation and crystallization to obtain a potassium tellurite crystal; and (4) the potassium tellurite crystal is dried to obtain the potassium tellurite product. The method for preparing potassium tellurite is a preparation process which is safe, highly efficient and environment friendly. The preparation method of the invention takes tellurium dioxide, water and potassium hydroxide as materials, the product is potassium tellurite and water, and the target product can be obtained by removing water out of the product; moreover, the preparation method of the invention has the advantages of no generation of other harmful substances in the preparation process, simple procedure, flexible operating conditions and easy industrialized promotion and application.

Description

technical field [0001] The invention relates to a preparation method of a compound, in particular to a preparation method of potassium tellurite. Background technique [0002] Potassium tellurite is an important chemical raw material, its molecular formula is K 2 TeO 3 The molecular weight is 253.79, and it is a colorless crystalline powder at room temperature, which is very easy to absorb water and deliquescence. It is mainly used for medical microbial culture, such as the preparation of microbial culture medium, such as the commonly used potassium tellurite blood agar plate medium, which is used in medicine to cultivate and diagnose diphtheria bacteria. Or for the preparation of medicines, and also for the production of tellurate special glasses. [0003] At present, potassium tellurite is prepared by the reaction of tellurium dioxide and potassium carbonate to produce potassium tellurite. The preparation process can be expressed as: TeO 2 +K 2 CO 3 = K 2 TeO 3 +CO...

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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