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Preparation of potassium hydrate

A technology of potassium hydroxide and filtrate, which is applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of low investment, low energy consumption, and large power consumption, and achieve low investment, The effect of low energy consumption

Inactive Publication Date: 2009-07-15
厦门易工化学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an energy-efficient electrolytic equipment for the production of potassium hydroxide by the existing electrolytic method. Consumption is low, investment is few, the preparation method of the potassium hydroxide that adopts non-electrolytic method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 149g KCl in water to form a saturated solution, add 93g Ni(OH) 2 , and then add liquid ammonia while stirring, control the temperature at 0°C, keep the pressure at 0.1MPa, and make the free ammonia concentration in the solution reach 20%. The crystal slurry formed by the reaction was centrifugally filtered in a closed state. The filter cake is recycled, the filtrate is heated and evaporated, and the temperature is raised to 120°C to completely evaporate the ammonia in the filtrate. The filtrate after ammonia distillation is filtered to obtain a liquid potassium hydroxide product, further heating and dehydration can obtain 93g of a solid potassium hydroxide product, and the heating and dehydration can be carried out according to a traditional solid potassium hydroxide production process.

Embodiment 2

[0020] Dissolve 149g KCl in water to form a saturated solution, add 93g Ni(OH) 2 , and then feed ammonia gas while stirring, control the temperature at 10°C, keep the pressure at 0.2MPa, and make the free ammonia concentration in the solution reach 50%. The crystal slurry formed by the reaction was centrifugally filtered in a closed state. The filter cake is recycled, the filtrate is heated and evaporated, and the temperature is raised to 120°C to completely evaporate the ammonia in the filtrate. The filtrate after ammonia distillation was filtered to obtain a liquid potassium hydroxide product, which was further heated and dehydrated to obtain 99 g of a solid potassium hydroxide product.

Embodiment 3

[0022] Dissolve 149g KCl in water to form a saturated solution, add 93g Ni(OH) 2 , and then feed ammonia gas while stirring, control the temperature at 20° C., keep the pressure at 0.3 MPa, and make the free ammonia concentration in the solution reach 30%. The crystal slurry formed by the reaction was centrifugally filtered in a closed state. The filter cake is recycled, the filtrate is heated and evaporated, and the temperature is raised to 120°C to completely evaporate the ammonia in the filtrate. The filtrate after ammonia distillation is filtered to obtain a liquid potassium hydroxide product, which can be further heated and dehydrated to obtain 95 g of a solid potassium hydroxide product.

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PUM

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Abstract

The invention provides a method for preparing potassium hydroxide, which relates to alkali metal hydroxide. The invention provides a potassium hydroxide preparing method with low energy consumption and small investment and using the electroless method. The method comprises the following steps: dissolving a KCl solution in water to form a saturated solution, adding Ni(OH)2; introducing ammonia gas or adding liquid ammonia to the saturated solution for reaction so that the free ammonia concentration in the solution is between 20 percent and 50 percent to obtain a crystal mush; centrifugally filtering or filter pressing the crystal mush formed by reaction to obtain the filtrate which is a potassium hydroxide aqua ammonia; heating the filtrate to evaporate so that the ammonia inside the filtrate is evaporated completely to obtain the filtrate after the ammonia evaporation; filtering the filtrate after the ammonia evaporation to obtain the liquid potassium hydroxide product, and producing the solid product of potassium hydroxide by further heating and dehydrating.

Description

technical field [0001] The present invention relates to a kind of alkali metal hydroxide, relate in particular to a kind of preparation method of potassium hydroxide. Background technique [0002] Potassium hydroxide is an important chemical raw material, and the current industry all adopts the method of electrolysis of potassium chloride to produce potassium hydroxide. Although the potassium hydroxide produced by the electrolysis method has less pollution and high quality, due to the strict technical requirements of the electrolysis device and the need for a chlorine gas treatment and application device, the one-time investment is large and consumes a large amount of electric energy. [0003] The invention patent application with the publication number CN1410597 discloses a method for preparing potassium hydroxide. The method belongs to the liquid metal cathodic electrolysis method. Metals such as gallium, indium, tin, bismuth, silver or some of them are used in the electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D1/20
Inventor 钟劲光
Owner 厦门易工化学科技有限公司