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Method for preparing high-purity chlorine dioxide through solid-state heterogeneous catalysis

A heterogeneous catalysis, chlorine dioxide technology, applied in chlorine dioxide, chlorine dioxide and other directions, can solve the problems of high waste liquid treatment cost, harsh equipment requirements, and difficulty in product purity to meet practical requirements, and achieve a single product, stable two. The effect of chlorine oxide and high product purity

Active Publication Date: 2017-02-15
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] The purpose of the present invention is to provide a new method for the preparation of high-purity chlorine dioxide by solid-state heterogeneous catalysis. The technical problems to be solved are the strict requirements on equipment and the high cost of waste liquid treatment in the production of chlorine dioxide currently used in the market. , produce chlorine and other side reaction products, the product purity is difficult to meet the practical requirements and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh the reactant according to the molar ratio of potassium chlorate and malic acid as 1:2, add the catalyst with a molar ratio of 0.001:1 to potassium chlorate—transition metal element iron supported on silicon-based molecular sieve SBA-15, mix and grind finely. The mixed raw materials were put into the reaction device, heated, and the temperature was adjusted so that the temperature was slowly raised to 30° C., and the temperature reached 30° C. and kept at a constant temperature for 24 hours. Chlorine dioxide gas uses water as absorbent, adopts multi-stage absorption, and tail gas is absorbed with sodium hydroxide solution. The chlorine dioxide solution was quantitatively analyzed by the national standard five-step iodometric method.

[0047] According to the five-step iodometric method, prepare a 0.1mol / L sodium thiosulfate standard solution, calibrate with potassium dichromate and dilute to 0.01mol / L for later use. Prepare 2.5mol / L HCl solution, 100g / L potassium ...

Embodiment 2

[0064] Weigh the reactant according to the molar ratio of potassium chlorite and malic acid of 1:2, add the catalyst with a molar ratio of 0.003:1 to potassium chlorite—transition metal nickel supported on silicon-based molecular sieve MCM-41, mix and grind finely. The mixed raw materials were put into the reaction device, heated, and the temperature was adjusted so that the temperature rose slowly to 30° C., and the temperature reached 30° C. and kept at a constant temperature for 22 hours. Chlorine dioxide gas uses water as absorbent, adopts multi-stage absorption, and tail gas is absorbed with sodium hydroxide solution. According to the assay method described in Example 1, the chlorine dioxide purity recorded in the gained chlorine dioxide aqueous solution is 90.9%.

Embodiment 3

[0066] The reactant was weighed according to the molar ratio of potassium chlorate and malic acid hydrate being 1:2, and the catalyst-transition metal element platinum supported on silicon-based molecular sieve MSU with a molar ratio of 0.004:1 to potassium chlorate was added, mixed and finely ground. The mixed raw materials were put into the reaction device, heated, and the temperature was adjusted so that the temperature rose slowly to 30°C, and the temperature reached 30°C and kept at a constant temperature for 20h. Chlorine dioxide gas uses water as absorbent, adopts multi-stage absorption, and tail gas is absorbed with sodium hydroxide solution. According to the assay method described in Example 1, the chlorine dioxide purity recorded in the gained chlorine dioxide aqueous solution is 94.4%.

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Abstract

The invention discloses a method for preparing high-purity chlorine dioxide through solid-state heterogeneous catalysis, which belongs to the chemical field of inorganic compound preparation. The preparation method comprises the following step: by adopting chlorate or chlorite and polyatomic acid or a polyatomic acid aquo-complex as raw materials, by adopting a silica-based molecular sieve loading transition metal as a catalyst, and by adopting a solid-state heterogeneous catalysis heating method, preparing the high-purity chlorine dioxide through controlling a molar ratio, reaction temperature and other conditions of reactants. The method adopts a solid-state method, which is different from other methods, so that the defects of corrosion of strong acid on devices, impurity products and difficulty in separation in a liquid phase method are avoided, the process is simple, other impurities such as chlorine cannot be produced, and the purity of the prepared chlorine dioxide can achieve 90 percent or more.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic compounds, and in particular relates to a new method for preparing high-purity chlorine dioxide by solid-state heterogeneous catalysis. Background technique [0002] Water is the basis for the survival and development of all living things, without water there is no life. my country is one of the countries with the most serious shortage of water resources in the world. According to relevant research, 80% of the diseases in the world are related to unsafe drinking water. In order to solve the problem of drinking water safety, the government has taken many measures to strengthen the protection of the environment and the control of pollution. Scientific researchers are also looking for efficient water purification and disinfection methods to improve water quality. Physical disinfection and chemical disinfection are commonly used water disinfection techniques. Physical disinfection ...

Claims

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Application Information

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IPC IPC(8): C01B11/02
CPCC01B11/023C01B11/024
Inventor 单永奎孔爱国孔繁涛姜贤武韩振董冰
Owner EAST CHINA NORMAL UNIVERSITY
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