Preparation method of potassium ferrate

A technology of potassium ferrate and potassium hydroxide, which is applied in the fields of chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problem of high air tightness and corrosion resistance requirements of production equipment, complex purification process of potassium ferrate, and impractical Better and complete separation of problems, to achieve the effect of easy filtration and removal, elimination of potential safety hazards, and improvement of safety factor

Active Publication Date: 2015-01-07
MUNICIPAL ENVIRONMENTAL PROTECTION ENG CO LTD OF CREC SHANGHAI GRP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the toxic and corrosive dangerous gas chlorine is used in the production process, the requirements for the airtightness and corrosion resistance of the production equipment are relatively high, which is likely to cause safety accidents
In addition, during this process, excessive alkali needs to be added to precipitate the generated potassium chloride from the potassium hypochlorite solution, so as not to affect the purity of the subsequent ferrate, but this process wastes too much alkali on the one hand, and on the other hand , the precipitation of potassium chloride from the potassium hypochlorite solution is incomplete, which makes the subsequent purification process of potassium ferrate more complicated
Zhou Weiwei et al. tried to use calcium hypochlorite instead of chlorine to react with potassium hydroxide to prepare potassium hypochlorite (preparation of potassium ferrate and its ability to remove bisphenol A in micro-polluted water[J], Water Treatment Technology, 2013, 39(10) : 72-75.), but this process generates slightly soluble calcium hydroxide, which can not be completely separated in potassium hypochlorite solution

Method used

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  • Preparation method of potassium ferrate
  • Preparation method of potassium ferrate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Weigh 8.00g of calcium hypochlorite and 5.33g of potassium carbonate respectively, and configure them into equal-volume solutions of 50ml each, mix the two, and after reacting for 15min, filter to remove the calcium carbonate precipitate, place the filtrate in an ice-water bath, and Stir while slowly adding potassium hydroxide solid 100g to the filtrate to obtain an alkaline saturated potassium hypochlorite solution;

[0027] (2) In an ice-water bath environment, slowly add 20.79 g of ferric nitrate nonahydrate solid into the alkaline saturated potassium hypochlorite solution prepared in step (1), stir at a speed of 900 r / min, and react for 60 minutes to generate potassium ferrate solution ;

[0028] (3) Add 100ml of saturated potassium hydroxide solution to the potassium ferrate solution prepared in step (2), leave standstill in the ice-water bath environment for 30min, and filter with G2 glass sand core funnel to obtain the solid thick product of potassium ferrate...

Embodiment 2

[0032] (1) Weigh 12.00g of calcium hypochlorite and 8.00g of potassium carbonate respectively, and configure each 100ml of equal-volume solutions, mix the two, and after reacting for 15min, filter to remove the calcium carbonate precipitate, place the filtrate in an ice-water bath, and Stir, slowly add potassium hydroxide solid 200g in the filtrate, obtain alkaline saturated potassium hypochlorite solution;

[0033] (2) In an ice-water bath environment, slowly add 31.20 g of ferric nitrate nonahydrate solid into the alkaline saturated potassium hypochlorite solution prepared in step (1), stir at a speed of 900 r / min, and react for 60 minutes to generate potassium ferrate solution ;

[0034] (3) Add 200ml of saturated potassium hydroxide solution to the potassium ferrate solution prepared in step (2), after leaving standstill in the ice-water bath environment for 30min, filter with G2 glass sand core funnel to obtain the solid thick product of potassium ferrate;

[0035] (4) D...

Embodiment 3

[0038] (1) Weigh 18.00g of calcium hypochlorite and 12.00g of potassium carbonate respectively, and configure each 100ml of equal-volume solutions, mix the two, react for 15min, filter and remove the calcium carbonate precipitate, place the filtrate in an ice-water bath, and Stir, slowly add potassium hydroxide solid 200g in the filtrate, obtain alkaline saturated potassium hypochlorite solution;

[0039] (2) In an ice-water bath environment, slowly add 46.80 g of ferric nitrate nonahydrate solid to the alkaline saturated potassium hypochlorite solution prepared in step (1), stir at a speed of 900 r / min, and react for 60 minutes to generate potassium ferrate solution ;

[0040] (3) Add 200ml of saturated potassium hydroxide solution to the potassium ferrate solution prepared in step (2), after leaving standstill in the ice-water bath environment for 30min, filter with G2 glass sand core funnel to obtain the solid thick product of potassium ferrate;

[0041] (4) Dissolve the t...

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Abstract

The invention discloses a preparation method of potassium ferrate solid, belonging to the technical field of water treatment. The preparation method comprises the following steps: (1) reacting calcium hypochlorite and potassium carbonate to obtain an alkaline saturated potassium hypochlorite solution; (2) in an ice water bath environment, adding iron nitrate nonahydrate solid into the alkaline saturated potassium hypochlorite solution to generate a potassium ferrate solution; (3) adding a saturated potassium hydroxide solution into the potassium ferrate solution, standing in an ice water bath, and carrying out vacuum filtration to obtain a potassium ferrate solid crude product; (4) dissolving the potassium ferrate crude product in a potassium hydroxide solution, carrying out vacuum filtration, recrystallizing in the ice water bath, and carrying out vacuum filtration to obtain the recrystallized potassium ferrate solid; and (5) carrying out immersion cleaning on the recrystallized potassium ferrate solid sequentially with n-hexane, ethanol, n-pentane and ethanol, and carrying out vacuum drying to constant weight, thereby obtaining the finished potassium ferrate powder solid product. The method is simple to operate, avoids using dangerous gas chlorine and aether, and has the advantages of high safety and high potassium ferrate purity (greater than 98%).

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a safe and convenient preparation method of potassium ferrate solid for water treatment. Background technique [0002] Potassium ferrate is a hexavalent iron salt with strong oxidizing properties. It is a green water treatment agent that integrates the functions of oxidation, flocculation, adsorption, and disinfection, and does not produce harmful substances such as trihalomethanes after the reaction. It has Great application prospects. [0003] At present, the preparation methods of potassium ferrate are mainly divided into three categories: peroxide high-temperature oxidation method, electrochemical method, and hypochlorite oxidation method. Among them, under alkaline conditions, the oxidation of ferric salt by hypochlorite to prepare potassium ferrate is a relatively mature method that is used most. In 1950, Hrostowski and Scott proposed a two-step method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 丁磊刘前进钟梅英
Owner MUNICIPAL ENVIRONMENTAL PROTECTION ENG CO LTD OF CREC SHANGHAI GRP
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