One step method of continuously synthesizing sodium dichloro ise cyanurate linking producing trichloro isocyanurate using sodium hypochlorite

A technology of sodium dichloroisocyanurate and trichloroisocyanuric acid, which is applied in the direction of organic chemistry, can solve problems such as complicated operation, poor solubility, and poor production environment, so as to save manpower and power, improve production efficiency, The effect of short production process

Active Publication Date: 2006-06-14
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

But the disclosed sodium hypochlorite-chlorine one-step method for synthesizing sodium dichloroisocyanurate, the sodium dichloroisocyanurate product of gained has following deficiencies: 1, available chlorine is on the low side (available chlorine≤60%); 2. Poor solubility, high water-insoluble matter (water-insoluble matter ≥ 1.20%); 3. Low yield (58-62.7% of theoretical amount in terms of cyanuric acid); 4. Nitrogen trichloride still reacts Formation, prone to explosion during production
5. The mother liquor after crystallization is not recovered from trichloroisocyanuric acid
Therefore, this method has the defects of long process, many production equipments, high investment, cumbersome operation and poor production environment.

Method used

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  • One step method of continuously synthesizing sodium dichloro ise cyanurate linking producing trichloro isocyanurate using sodium hypochlorite
  • One step method of continuously synthesizing sodium dichloro ise cyanurate linking producing trichloro isocyanurate using sodium hypochlorite

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Production method with an annual output of 1,700 tons of sodium dichloroisocyanurate and 300 tons of sodium trichloroisocyanurate in parallel:

[0035] (1) Production of monosodium dicyanuric acid:

[0036] 1. Preparation of Chloruric Acid Monosodium Salt Suspension:

[0037]In a 2000-liter glass-lined reactor equipped with a stirring mechanism, a thermometer, an industrial acidity meter, a feed port, and a jacket for heat exchange, add 1200 kg of warm water preheated to 32-34 ° C, and add powder with a content of ≥ 98.5% cyanuric acid 340kg, stir to make it into a uniform slurry suspension. Slowly add 20% caustic soda solution under stirring and keep the reaction temperature not lower than 35°C until the pH value of the reaction suspension is 8.5, stop adding caustic soda, stir and react for 30 minutes, if the pH value remains unchanged at 8.5, the reaction is complete (The amount of adding 20% ​​liquid caustic soda is 518.8~521.5kg). After the reaction, 2,058.8 to ...

Embodiment 2

[0073] The annual output of sodium dichloroisocyanurate is 5,000 tons, and the joint production of sodium trichloroisocyanurate is 900 tons.

[0074] (1) Production of monosodium dicyanuric acid:

[0075] 1. Preparation of monosodium cyanuric acid suspension:

[0076]In the 5000-liter glass-lined reactor with the same device as in Example 1 (one) 1, add 3000 kg of warm water preheated to 32 to 34 ° C, and add 850 kg of fine powder content ≥ 98.5% cyanuric acid under stirring, press Embodiment 1 (one) The operating procedure and operating conditions of 1 add caustic soda and dissolve and neutralize to pH value 8.5 (adding 20% ​​liquid caustic soda amount is 1295~1304kg), reaction completes and makes monosodium cyanurate monosodium suspension 5145~ 5154kg, the slurry liquid is pumped into a 5000-liter high-level glass reactor with stirring, thermometer and jacket heat exchange with a slurry pump and cooled to 20-25°C for later use.

[0077] 2. Preparation of monochloroisocyanu...

Embodiment 3

[0104] Tower-type single-stage chlorination full-continuous synthesis of sodium dichloroisocyanurate; the annual output of sodium dichloroisocyanurate is 5,000 tons, and the combined production of sodium trichloroisocyanurate is 900 tons.

[0105] (1) Production of monosodium dicyanuric acid:

[0106] 1. Preparation of monosodium cyanuric acid suspension:

[0107] According to "Example 2; (1) 1," the preparation of the monosodium cyanuric acid suspension was carried out with the same equipment, the same dosage, the same operating procedures and reaction conditions.

[0108] 2. Preparation of monochloroisocyanuric acid disodium salt solution

[0109] According to "Example 2; (1) 2," the same device, the same dosage, the same operating procedure and reaction conditions were used to prepare the monochloroisocyanuric acid disodium salt solution.

[0110] 3. Continuous chlorination reaction:

[0111] (1) Continuous chlorination reaction device: a glass-lined explosion-proof chlo...

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Abstract

The present invention belongs to the field of disinfection sterilizing agent technology, and discloses a method capable of utilizing sodium hypochloride and chlorine gas and adopting one-step continuous synthesis process to simultaneously produce sodium dichloroisocyanurate and trichloroisocyanuric acid. Said method includes the following steps: synthesizing disodium monochloroisocyanurate salt, two-stage chlorination, low-temperature dissolving, heat-insulating, press-filtering to remove impurity, secondary chlorine gas supplement, freezing and crystallizing, dewatering and drying so as to simultaneously produce sodium dichloroisocyanurate and trichloroisocyanuric acid powder product.

Description

technical field [0001] The invention belongs to the field of disinfectant and bactericide, and relates to a main production method for synthesizing sodium dichloroisocyanurate and co-producing trichloroisocyanuric acid in one step and continuously using sodium hypochlorite-chlorine gas. Background technique [0002] Sodium dichloroisocyanurate and trichloroisocyanuric acid are both extremely strong disinfectants and chlorinating agents and oxidants 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/36
Inventor 韩伯睿柴如行李俊娟徐可宸刘荣新
Owner 河北冀衡化学股份有限公司
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