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2,4,6- trithione-s-triazine alkali metal salt preparation method

A technology of alkali metal salt and trimercapto, applied in 2 fields, can solve problems such as consumption and low yield, and achieve the effects of low sodium chloride content, high product yield and short preparation period

Active Publication Date: 2008-04-23
朴洙根
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] These compounds can be produced by a relatively simple process, which is obtained by reacting thiocyanuric chloride (2,4,6-Trimercapto-s-triazine (Cyanuric chloride)) and sodium sulfide, but the method yield is low, and the filtrate In the process of circulation, as well as in the process of acidification and alkalinization, a large number of by-products will be produced
[0014] In the existing technology for preparing trimercapto-s-triazine alkali metal salts, a lot of energy needs to be consumed when cooling the reaction liquid, and the solubility of trimercapto-s-triazine sodium salt to water is high, and it is only the theoretical yield of precipitation. 70% of the yield, so all processes such as the process of reprocessing the filtrate, in order to increase the yield, repeated acidification, alkalinization and cooling, etc., so there is a problem that more energy is required

Method used

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Embodiment 1

[0067] 200 g (1.427 mol) of 40 wt% NaSH aqueous solution was added to 130 ml of water, and the temperature of the solution was adjusted to 50°C. Then, an aqueous solution of 87 g (0.473 mol) of cyanuric chloride and 70 g (0.87 mol) of 50 wt% NaOH was added. At this time, the pH value was maintained at 9.5 and the temperature at 50°C. After all the cyanuric chloride and NaOH had been added, the mixture was stirred at 50°C for 30 minutes.

[0068] After cooling the reaction solution to room temperature, concentrated HCl was added to acidify to pH 6. At this time Na3T-H 3 Quantitative precipitation will occur. While filtering the precipitate according to centrifugation, use a small amount of water to remove a small amount of NaCl doped in the precipitate.

[0069] The weight of the solid obtained by centrifugation was 136.9 g, containing 60 wt% Na3T-H 3 (Being the initial material, being equivalent to 98 mol % of the total amount of cyanuric chloride added), the remainder is ...

Embodiment 2

[0074] In a container containing 150ml of water, add 19.04g of Na 2 After S (0.244 mol) and 60.8 g of NaSH (1.084 mol) were dissolved, 80 g of cyanuric chloride (0.434 mol) was added. At this time the temperature was maintained at 45°C.

[0075] The initial pH value was 9. During the addition of cyanuric chloride, 50 wt% NaOH was added, and the pH value was maintained while stirring for 1.5 hours.

[0076] After cooling the reactant to room temperature, concentrated HCl was added to acidify to pH 6. At this time Na3T-H 3 Quantitative precipitation will occur. While filtering the precipitate according to centrifugation, use a small amount of water to remove a small amount of NaCl doped in the precipitate.

[0077] The weight of the solid obtained by centrifugation is 130g, containing 58wt% Na3T-H 3 (Being the initial material, being equivalent to 98 mol % of the total amount of cyanuric chloride added), the remainder is water.

[0078] 130 g of the solid obtained by centri...

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Abstract

The invention discloses a preparation method of 2,4,6-trimercapto-s-triazine alkali metal salt, which comprises the following steps: (a) under the conditions of temperature 20°C-70°C and pH value 8.5-10.5 , in a water-soluble solvent, react thiocyanuric chloride with Na2S and / or NaSH; (b) add inorganic acid to the product of step (a) for acidification, and precipitate 2,4,6-trimercapto- s-triazine; (c) after dispersing the 2,4,6-trimercapto-s-triazine obtained in the step (b) of separation and precipitation in a water-soluble solvent, adding hydroxide to obtain 2,4, 6-trimercapto-s-triazine alkali metal salt; (d) after evaporating and cooling the aqueous solution of the alkali metal salt of 2,4,6-trimercapto-s-triazine prepared in step (c), the Crystalline 2,4,6-trimercapto-s-triazine alkali metal salt is obtained. The method of the invention has simple steps, short preparation period, low content of by-product sodium chloride in the product, and high product yield.

Description

technical field [0001] The invention relates to a preparation method of 2,4,6-trimercapto-s-triazine alkali metal salt. Background technique [0002] The 2,4,6-trimercapto-s-triazine alkali metal salt is used as a heavy metal removal agent, and is applied to the removal of heavy metals in various waste waters. [0003] With the development of industry and the improvement of human living standards, people have lived a rich and colorful life. However, various factories, thermal power plants, incineration sites, garbage disposal sites, and university research institutes produce a large amount of wastewater containing heavy metals. If these heavy metals cannot be properly treated and flow into nature, they will cause serious pollution to the environment and pose a great threat to human beings who are at the top of the food chain. [0004] In order to remove heavy metals contained in wastewater, various heavy metal removing agents have been developed. However, these heavy meta...

Claims

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Application Information

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IPC IPC(8): C07D251/38
Inventor 朴洙根张炳万
Owner 朴洙根
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