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Method for continuously synthesizing sodium dichloro isocyanurate dihydrate by wet process

A technology of sodium dichloroisocyanurate and dichloroisocyanuric acid, which is applied in the field of continuous two-step wet production of two crystal water sodium dichloroisocyanurates, achieving short production process, low active chlorine content and excellent quality Effect

Active Publication Date: 2011-10-05
河北冀衡化学股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products of this process mostly contain insoluble impurities, which are only suitable for the production and application of low-grade preparations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first step, the preparation of chlorouric acid disodium salt solution:

[0025] In a 20,000-liter stainless steel reaction kettle equipped with a stirring mechanism, a thermometer, a feeding port, and a jacket for heat exchange, add 15,000 liters of warm water preheated to 32°C, add 1,500 kg of dry cyanuric acid under stirring, and stir to make it Homogeneous slurry suspension. Maintain the reaction temperature under stirring and slowly add 25% caustic soda solution under the condition of 36 ° C, stir the reaction and obtain a clear solution, and the obtained concentration is 90g / L, and the total alkalinity is 70g / L Disodium cyanurate solution, Filter the solution with a tubular filter to remove impurities, then pump the clear liquid into a 5000-liter glass reactor with stirring, thermometer, and jacket for heat exchange, and cool it to 25°C for later use.

[0026] The second step, the synthesis of dichloroisocyanuric acid

[0027] One-stage chlorination reaction:...

Embodiment 2

[0039] The first step, the preparation of chlorouric acid disodium salt solution:

[0040] In a 20,000-liter stainless steel reaction kettle equipped with a stirring mechanism, a thermometer, a feeding port, and a jacket for heat exchange, add 15,000 liters of warm water preheated to 34°C, add 1,500 kg of dry cyanuric acid under stirring, and stir to make it Homogeneous slurry suspension. Maintain the reaction temperature under stirring and slowly add 25% caustic soda solution under the condition of 35°C, stir the reaction and obtain a clear solution, and prepare a concentration of 60g / L and a total alkalinity of 60g / L disodium cyanurate solution. Filter the solution with a tubular filter to remove impurities, then pump the clear liquid into a 5000-liter glass reactor with stirring, thermometer, and jacket for heat exchange, and cool it to 20°C for later use.

[0041] The second step, the synthesis of dichloroisocyanuric acid

[0042]One-stage chlorination reaction: pump the...

Embodiment 3

[0054] The first step, the preparation of chlorouric acid disodium salt solution:

[0055] In a 20,000-liter stainless steel reaction kettle equipped with a stirring mechanism, a thermometer, a feeding port, and a jacket for heat exchange, add 15,000 liters of warm water preheated to 34°C, add 1,500 kg of dry cyanuric acid under stirring, and stir to make it Homogeneous slurry suspension. Maintain the reaction temperature under stirring and slowly add 35% caustic soda solution under the condition of 36°C, stir the reaction and obtain a clear solution, and prepare a concentration of 70g / L and a total alkalinity of 50g / L disodium cyanurate solution. Filter the solution with a tubular filter to remove impurities, then pump the clear liquid into a 5000-liter glass reactor with stirring, thermometer, and jacket for heat exchange, and cool it to 23°C for later use.

[0056] The second step, the synthesis of dichloroisocyanuric acid

[0057] One-stage chlorination reaction: pump th...

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PUM

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Abstract

The invention belongs to the technical field of disinfecting and sterilizing agent and discloses a method for continuously synthesizing sodium dichloro isocyanurate dihydrate by using cyanuric acid, caustic soda liquid and chlorine. The production method comprises the following steps: synthesizing disodium cyanurate, filtering, purifying, performing two stages of chlorination, cooling, crystallizing, centrifuging, mixing with sodium carbonate with a wet process, drying, granulating and the like to obtain the sodium dichloro isocyanurate dehydrate. The method is characterized in that: the adoption of a continuous chlorination synthesis process improves the utilization rate of equipment; and the process avoids dissolution, alkali addition and chlorine addition processes, so the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of disinfectant and bactericide, and relates to a continuous two-step wet method for producing two crystal water sodium dichloroisocyanurates. Background technique [0002] Sodium dichloroisocyanurate is a very strong disinfectant, and also a chlorinating agent and oxidizing agent in chemical production. Both products are high-efficiency, rapid, broad-spectrum, and low-toxicity disinfectants, which can effectively and quickly kill various bacteria, fungi, spores, and molds. The two products also have the effect of inactivating the surface antigens of hepatitis A and hepatitis B. It has the functions of killing algae, deodorizing, purifying water and bleaching. Widely used in swimming pool water disinfection, drinking water disinfection, industrial circulating water treatment, food processing industry, food hygiene industry, aquaculture industry, daily chemical industry, medical nursery, epidemic prevention, garbage ...

Claims

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Application Information

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IPC IPC(8): C07D251/36
Inventor 肖辉柴如行王金石刘计良郭文双
Owner 河北冀衡化学股份有限公司
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