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Preparation method for trichloroisocyanuric acid

A technology of trichloroisocyanuric acid and chlorine flow, which is applied in the direction of organic chemistry, can solve the problems of large amount of sodium chloride wastewater, high cost of caustic soda, and high residual sodium chloride, so as to save alkali cost and reduce production cost, yield improvement effect

Active Publication Date: 2011-10-05
HEZE HUAYI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The production of TCCA by the above method has the disadvantages of high cost of caustic soda, large amount of sodium chloride wastewater, and high residual sodium chloride in TCCA products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of DCCA

[0027] Ingredients adopt the following weight (Kg):

[0028] CA, calcium carbonate, liquid chlorine, water, citric acid, sodium dodecylbenzenesulfonate:

[0029] 585, 459, 648, 5400, 0.5-1.0, 5-10

[0030] Add CA and calcium carbonate into the reaction tank according to the above weight, stir to form a uniform suspension, open the liquid chlorine cylinder, and the liquid chlorine is gasified through the buffer tank (spraying the outer wall with water) and then passed into the above suspension, 20 After reacting at -25°C for 3-5 hours, stop the chlorine flow, take a sample and test it to pass the test, and start discharging to obtain DCCA wet material with a water content of 30%. The average yield of DCCA is 90%, and the available chlorine content is about 51%.

[0031] (2) Preparation of NaDCCA

[0032] Put the DCCA wet material obtained in step (1) into the centrifuge, dry it for 1.0-1.5h, rinse it with purified water, continue to dry it fo...

Embodiment 2

[0036] (1) Preparation of DCCA

[0037] Except for the masking agent and dispersant, the others are the same as step (1) of Example 1, the metal ion masking agent is EDTA sodium salt, and the dispersant is polyethylene glycol 400;

[0038] (2) Preparation of NaDCCA solution

[0039] Weigh DCCA109Kg, put it into 700Kg purified water under stirring, then add 300Kg of sodium carbonate solution with a mass fraction of 10%, adjust the pH value to 6-7, pump the above-mentioned NaDCCA solution into the filter press for pressure filtration, and the filtrate stand-by;

[0040] (3) Preparation of TCCA

[0041] Add 1 / 2 volume of purified water into the chlorination reaction kettle in advance, add EDTA sodium salt and polyethanol 400, and pass chlorine in advance, and add the filtrate obtained in step (2) into the pre-chlorinated water continuously, and feed while passing chlorine, The pH value is controlled at about 2.5-3.0, and the reaction temperature is controlled at 10-15°C. The g...

Embodiment 3

[0043] (1) Preparation of DCCA

[0044] With embodiment 1 step (1);

[0045] (2) Preparation of Ca(DCCA)1 / 2 suspension

[0046]Weigh 200Kg of DCCA, put it into 800Kg purified water under stirring, then add 380Kg of calcium hydroxide suspension with a mass fraction of 10%, stir evenly, adjust the pH value to 11-12, and generate Ca(DCCA)1 / 2 suspension stand-by;

[0047] (3) Preparation of TCCA

[0048] Add 1 / 2 volume of purified water into the chlorination reaction kettle in advance, add citric acid and sodium dodecylbenzenesulfonate, pass chlorine in advance, pump the suspension obtained in step (2) into the chlorination reaction kettle , while feeding chlorine, the pH value is controlled at about 3.0-3.2, and the reaction temperature is controlled at 20-25°C. The generated TCCA suspension overflows from the reactor through the guide tube, centrifugally dried, dried, and granulated. Continuous preparation of TCCA, the average yield of TCCA is 85-90%, and the available chlor...

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Abstract

The invention relates to a preparation method for a disinfectant chloroisocyanuric acid, and particularly discloses a preparation method for trichloroisocyanuric acid. The preparation method for trichloroisocyanuric acid is characterized by comprising the following steps of: chlorinating CA (cyanuric acid) with calcium carbonate as an acid binding agent under the actions of a metal ion masking agent and a dispersant to generate DCCA (dichloroisocyanuric acid), mixing with a base to obtain MDCCA (metal dichloroisocyanuric acid), adding to a water system with chlorine introduced, and reacting under the conditions of low temperature and acid to obtain TCCA (trichloroisocyanuric acid). The preparation method for trichloroisocyanuric acid provided by the invention has the beneficial effects that: DCCA is prepared by a calcium carbonate method and TCCA is prepared from DCCA, thus saving base cost and reducing waste saline generation; and by using DCCA to prepare TCCA, the generation of nitrogen trichloride can be effectively inhibited, the TCCA production process is safer, simultaneously the yield of TCCA is improved and the production cost of TCCA is lowered.

Description

[0001] (1) Technical field [0002] The invention relates to a preparation method of a disinfectant chloroisocyanuric acid, in particular to a preparation method of trichloroisocyanuric acid. (2) Background technology [0003] Trichloroisocyanuric acid is also called TCCA. At present, the mainstream process for large-scale production of TCCA is to first react cyanuric acid (CA) with an alkaline solution to form trisodium cyanurate (Na3CA), and then add it to the chlorine-passing water system. , Feed while passing chlorine, and react to generate TCCA under acidic conditions. The advantage of this process is that it is easy to operate, the chlorination reaction is complete, and it is convenient to realize continuous production. The disadvantage is that the residual amount of sodium chloride in TCCA products is relatively high, and a large amount of sodium chloride wastewater is generated. [0004] Domestic Chen Hongzhi et al. (CN86104526) proposed to use urea as the starting ...

Claims

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Application Information

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IPC IPC(8): C07D251/36
Inventor 李啸风陈平苏华
Owner HEZE HUAYI CHEM
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