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Preparation of organic sulfur heavy metal capturing agent and recycling and treating method of filtrate thereof

A heavy metal scavenger, recycling and processing technology, applied in organic chemistry, alkali metal chloride, water/sewage treatment and other directions, can solve the problems of complex reaction route, long cycle, large energy consumption, etc., to achieve simple production process, cycle time Short, less by-product effects

Inactive Publication Date: 2015-11-11
SHANXI CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has complex reaction routes, long cycle, and high energy consumption. Hydrochloric acid and sodium hydroxide are used repeatedly in the process, which produces a large number of industrial by-products and releases toxic hydrogen sulfide gas.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] In the 500ml four-necked bottle with reflux condenser, constant pressure dropping funnel, thermometer, add deionized water 200ml, add solid sodium sulfide 75.2g (60wt% content) under stirring condition, solid sodium hydrosulfide 23.13g (70wt% %content). After fully dissolving, 53.33 g of solid cyanuric chloride was added, and at this time, the temperature rose from room temperature to 63° C., and the pH value was 9. Add 23.13 g of 50 wt % sodium hydroxide solution to adjust the pH value to 12, and the temperature rises to 71° C. at this time. The reaction was maintained under these conditions for an additional 2 hours. The reaction solution was cooled and crystallized in cold water at 20°C for 2 hours, and centrifuged for separation. Obtained 97.73 g of crystalline solid. The measured effective content is 55.23%, and the yield is 76.53%.

[0027] Add 265g of the obtained mother liquor into a 500ml four-necked bottle with a reflux condenser, a constant pressure dropp...

example 2

[0029] In a 500ml four-neck flask with a reflux condenser, a constant pressure dropping funnel, and a thermometer, add 200ml of deionized water, and add 69.60g (70wt% content) of solid sodium hydrosulfide under stirring conditions. After fully dissolving, 53.33 g of solid cyanuric chloride was added, and at this time, the temperature rose from room temperature to 69° C., and the pH value was 8. 69.6 g of 50 wt % sodium hydroxide solution was added to adjust the pH value to 13, and the temperature rose to 79° C. at this time. The reaction was maintained under these conditions for an additional 2 hours. The reaction solution was cooled and crystallized in cold water at 25°C for 2 hours, and centrifuged for separation. 95.35 g of a crystalline solid were obtained. The measured effective content is 55.13%, and the yield is 74.53%.

[0030] Add 277g of the obtained mother liquor into a 500ml four-necked bottle with a reflux condenser, a constant pressure dropping funnel, and a t...

example 3

[0032] In a 500ml four-neck flask with a reflux condenser, a constant pressure dropping funnel, and a thermometer, add 200ml of deionized water, and add 113.1g of solid sodium sulfide (60wt% content) under stirring conditions. After fully dissolving, 53.33 g of solid cyanuric chloride was added, at this time, the temperature rose from room temperature to 84° C., and the pH value was 11. Add 3.6 g of 50 wt % sodium hydroxide solution to adjust the pH value to 14, and the temperature at this time is 83°C. The reaction was maintained under these conditions for an additional 2 hours. The reaction solution was cooled and crystallized in cold water at 28°C for 2 hours, and centrifuged for separation. 91.76 g of crystalline solid were obtained. The measured effective content is 54.98%, and the yield is 71.53%.

[0033] Add 263g of the obtained mother liquor into a 500ml four-necked bottle with a reflux condenser, a constant pressure dropping funnel, and a thermometer, raise the te...

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PUM

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Abstract

The invention discloses preparation of an organic sulfur heavy metal capturing agent and a recycling and treating method of filtrate thereof. The effective component of the organic sulfur heavy metal capturing agent is 2,4,6-trithiocyanuric acid trisodium salt. A production method for the organic sulfur heavy metal capturing agent comprises the following steps: adding cyanuric chloride into an aqueous solution of sodium hydrosulfide and / or sodium sulfide for reaction, adding a sodium hydroxide solution to adjust the pH to 12 or above, and reacting for 2 hours to obtain an aqueous solution of 2,4,6-trithiocyanuric acid trisodium salt; cooling the reaction liquid, crystallizing, and carrying out centrifugal separation to obtain a 2,4,6-trithiocyanuric acid trisodium salt product; adding hydrochloric acid into the filtrate generated from centrifugal separation, carrying out precipitation and centrifugal filtration, adding the sodium hydroxide solution to adjust the pH to 12 or above to obtain the aqueous solution of 2,4,6-trithiocyanuric acid trisodium salt; repeating the steps; the filtrate generated from centrifugal filtration is subjected to a multi-effect salt steaming system. The preparation has the advantages of being simple in production process, short in production cycle, high in yield and few in by-products.

Description

technical field [0001] The invention relates to the preparation of an organic sulfur heavy metal trapping agent 2,4,6-trimercapto-s-triazine trisodium salt and a method for recovering and treating the filtrate. Background technique [0002] Trace amounts of heavy metal elements are essential to human health, but if there are too many heavy metal pollutants in the environment, it will cause fatal harm to humans, and even cause huge damage to the entire ecological environment. [0003] In recent years, with the further improvement of my country's industrialization and urbanization, factories and urban pollutants have increased sharply, especially as various industrial waste liquids are discharged into water bodies, the heavy metal content in them is getting higher and higher, which seriously affects human beings and people. The health and survival of other organisms, these ions pose a great threat to the environment and cannot be degraded naturally. [0004] The pollution of h...

Claims

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Application Information

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IPC IPC(8): C02F1/62C07D251/38C01D3/06
Inventor 程立惠杨建高孙富强季成官祁世宇程飞路晓娥崔健温达樊俊丽
Owner SHANXI CHEM RES INST
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