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Preparation method and application of potassium ferrate

A technology of potassium ferrate and sodium ferrate, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve problems such as short shelf life, immature preparation process of potassium ferrate, and low product purity

Inactive Publication Date: 2013-08-28
常州和方环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, due to the immature preparation process of potassium ferrate, it has not been put into large-scale production. The main reason is that the product has low purity, is easy to decompose, and has a short shelf life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Pass chlorine gas into saturated sodium hydroxide solution to prepare effective efficiency at 10% high-concentration sodium hypochlorite solution, containing 400 grams of sodium hydroxide in every liter of solution, after cooling to freezing point, filter, the crystallization in the solution is removed, after separation Add 1.2 liters of saturated ferric chloride aqueous solution to the solution by spraying, control the temperature near the freezing point, and stir at a high speed to form a sodium ferrate solution, filter, add 300 to 400 grams of potassium hydroxide to the filtrate, and stir slowly. Obtain the crystallization of potassium ferrate; after filtration, wash the solid potassium ferrate with isopropanol, and dry it in vacuum to obtain potassium ferrate with a purity of 98.5, and the yield is greater than 81%; Stored at room temperature for 1 year, the product decomposition rate is less than 1%.

Embodiment 2

[0023] Pass chlorine gas into saturated sodium hydroxide solution to prepare effective efficiency at 10% high-concentration sodium hypochlorite solution, containing 450 grams of sodium hydroxide in every liter of solution; after cooling to freezing point, filter, the crystallization in the solution is removed; after separation Add 1.0 liter of saturated ferric chloride aqueous solution to the solution by spraying, control the temperature near the freezing point, and stir at a high speed to form a sodium ferrate solution. Filtrate, add 300-400 grams of potassium hydroxide to the filtrate, stir slowly to obtain the crystallization of potassium ferrate; after filtration, wash the solid potassium ferrate with isopropanol and dry it in vacuum to obtain ferrate with a purity of 98.5 Potassium, and the yield is greater than 81%; the product is of high purity, and it can be stored for 1 year under airtight, dark and room temperature conditions, and the product decomposition rate is les...

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PUM

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Abstract

The invention discloses a preparation method and application of potassium ferrate. The method comprises the following steps: (1) introducing chlorine to a saturated sodium hydroxide liquor to prepare a high concentration sodium hypochlorite liquor, wherein the liquor per litter contains 400-500g of sodium hydroxide; (2) cooling the liquor to ice point, filtering and removing crystals in the liquor; (3) adding a saturated ferric trichloride aqueous liquor to the liquor, controlling the temperature near the ice point, and quickly stirring to form a sodium ferrate liquor; (4) filtering the sodium ferrate liquor, casting potassium hydroxide to the filtrate and slowly stirring to obtain crystals of potassium ferrate; and (5) filtering the crystals of potassium ferrate prepared by the step (4), and washing the potassium ferrate solid and vacuum drying to obtain the final product potassium ferrate. The potassium ferrate prepared by the method provided by the invention is higher in purity which is normally not greater than 98.5%, and the yield of the product is greater than 80%. The potassium ferrate of the product stored in a closed and lucifugal room temperature condition is less than 1%.

Description

technical field [0001] The invention relates to a preparation method of potassium ferrate, in particular to a preparation method of potassium ferrate and its use as a water treatment agent. Background technique [0002] Potassium ferrate contains FeO 4 2- A compound of which the central atom Fe exists in a hexavalent state, and the standard electrode potentials under acidic conditions and alkaline conditions are E 0 FeO 4 2- / Fe 3+ =2.20V, E 0 FeO 4 2- / Fe(OH) 3 =0.72V, therefore, no matter in acidic conditions or alkaline conditions, ferrate has strong oxidizing properties and is an excellent oxidizing agent. It has high-efficiency disinfection and is a new type of non-chlorine high-efficiency disinfectant. In chemical production, it is used as an oxidizing agent for sulfonic acid, nitrite, ferrocyanide and other inorganic substances. It is used to remove manganese, antimony and arsenic in zinc smelting. It is used in cigarette filters in the tobacco industry. Ho...

Claims

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Application Information

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IPC IPC(8): C01G49/00C02F1/72
Inventor 居明张念忠居然陈美萍
Owner 常州和方环保科技有限公司
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