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Method for preparing potassium hydroxide by using potassiummetaborate

A technology of potassium metaborate and potassium hydroxide, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of troublesome waste disposal, complicated technological process, few application fields, etc. Improve production efficiency, reduce equipment investment and reduce production costs

Active Publication Date: 2011-04-06
SHANDONG GUOBANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has relatively little investment in equipment, the process is complicated.
[0005] Potassium borohydride is used to reduce aldehydes, ketones, and acid chlorides and is oxidized to produce a large amount of waste. Its main component is potassium metaborate. Disposal is more troublesome, throwing it away directly will pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 82g of potassium metaborate into 112g of 35.7wt% sodium hydroxide aqueous solution, then heat up to 70°C under stirring conditions, add 160g of methanol, stir and reflux at constant temperature for 50 minutes, then cool to 60°C for solid-liquid separation, The liquid obtained by solid-liquid separation was heated and evaporated to obtain 42 g of solid potassium hydroxide.

Embodiment 2

[0026] Dissolve 82g of potassium metaborate into 112g of 35.7wt% sodium hydroxide aqueous solution, then heat up to 90°C under stirring conditions, add 190g of methanol, stir and reflux at constant temperature for 60 minutes, then cool to 55°C for solid-liquid separation, The liquid obtained by solid-liquid separation was heated and evaporated to obtain 49 g of solid potassium hydroxide.

Embodiment 3

[0028] Dissolve 82g of potassium metaborate into 112g of 35.7wt% sodium hydroxide aqueous solution, then heat up to 110°C under stirring conditions, add 240g of methanol, stir and reflux at constant temperature for 30 minutes, then cool to 50°C for solid-liquid separation, The liquid obtained by solid-liquid separation was heated and evaporated to obtain 47 g of solid potassium hydroxide.

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Abstract

The invention discloses a method for preparing potassium hydroxide by using potassiummetaborate, which comprises the following steps: (1) dissolving potassiummetaborate in aqueous solution of sodium hydroxide, wherein the molar ratio of the potassiummetaborate to the sodium hydroxide is 1:1; (2) heating the reaction solution obtained by the step (1) with stirring, adding methanol or ethanol when the temperature rises to 70 to 110 DEG C, stirring and refluxing; (3) cooling the mixed solution obtained by the step (2) and performing solid-liquid separation; and (4) heating and evaporating the liquid obtained by the solid-liquid separation of the step (3) and obtaining solid potassium hydroxide. The potassium hydroxide prepared by the method can be used in photographicchemicals, textile processing, adhesives, detergents, preservatives and fire retardants, the preparation of sodium perborate by a chemical process and preparation of borax by a carbonization process, and the like.

Description

technical field [0001] The invention relates to the preparation of potassium hydroxide, in particular to a method for preparing potassium hydroxide by using potassium metaborate. Background technique [0002] Potassium hydroxide is an important chemical raw material, which can be used to produce potassium salts such as potassium borohydride, potassium permanganate, potassium carbonate, potassium dihydrogen phosphate, etc. It is also widely used in medicine, light industry, textile and other fields. With the continuous development of application technology, the application of potassium hydroxide in liquid fertilizer, synthetic rubber, grease, catalyst, agricultural chemicals, photography, etc. is also expanding day by day, and it can also be used in papermaking, fragrance, ink, pigment and other industries. [0003] The preparation method of known potassium hydroxide is mostly made from electrolytic high-purity potassium chloride aqueous solution, and publication number is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D1/20
Inventor 廖仕学李琦斌王伟宏李进伟
Owner SHANDONG GUOBANG PHARMA
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