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Water-soluble high molecule intercalating agent containing thiourea group and preparation method

A water-soluble polymer and chelating agent technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of few practical applications and inability to stabilize heavy metals, and achieve equipment The effect of low investment

Active Publication Date: 2009-06-17
TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the currently reported thiourea-containing resins are white powdery substances with a high degree of cross-linking and are insoluble in water. They are mainly used to absorb heavy metals in drinking water and treat waste water containing precious metals or heavy metals. There are few practical applications. It cannot be used for the stabilization of heavy metals in solid waste

Method used

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  • Water-soluble high molecule intercalating agent containing thiourea group and preparation method
  • Water-soluble high molecule intercalating agent containing thiourea group and preparation method
  • Water-soluble high molecule intercalating agent containing thiourea group and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Put formaldehyde into the reaction kettle, adjust the pH value to 3 with a sulfuric acid aqueous solution with a concentration of 20% by volume, activate the formaldehyde at 50°C for 20 minutes, and then add thiourea, the molar ratio of formaldehyde and thiourea is 2.8: 1. Immediately adjust the pH value to 8.5 with a 20% aqueous sodium hydroxide solution by mass percentage, and react at 90°C for 30 minutes; then adjust the pH value to 6 with a 20% aqueous sulfuric acid solution by volume, and add The mass percentage concentration is the butanol solution of 15% benzenesulfonyl chloride, the molar ratio of benzenesulfonyl chloride and thiourea is 0.03:1, continues to react 5 minutes under 90 ℃ of conditions; Cool down to 55 ℃, with mass percentage concentration 20% sodium hydroxide aqueous solution adjusts the pH value of the solution to 7, and then cools down to 35° C. to produce a colorless, transparent, slightly viscous water-soluble polymer chelating agent containing ...

Embodiment 2

[0035] Add formaldehyde into the reaction kettle, adjust the pH value to 4 with a hydrochloric acid solution with a concentration of 20% by volume, activate the formaldehyde at 60°C for 25 minutes, and then add thiourea, the molar ratio of formaldehyde and thiourea is 2.3: 1. Immediately adjust the pH value to 11 with 20% ammonia solution by volume, and react at 85°C for 15 minutes; then adjust the pH value to 5.5 with acetic acid, and add 20% p-toluenesulfonate by mass The propanol solution of acid chloride, the molar ratio of p-toluenesulfonyl chloride and thiourea is 0.02:1, and the reaction is continued for 3 minutes at 85°C; the temperature is lowered to 50°C, and the volume percentage concentration is 20% ammonia solution to adjust the pH of the solution value to 6.5, and then lower the temperature to below 30°C to produce a water-soluble polymer chelating agent containing thiourea groups.

Embodiment 3

[0037] Add formaldehyde into the reaction kettle, adjust the pH value to 3.5 with formic acid, activate the formaldehyde at 55°C for 15 minutes, then add thiourea, the molar ratio of formaldehyde and thiourea is 1.9:1, and immediately adjust the pH value with triethanolamine to 10, react at 75°C for 45 minutes; then adjust the pH value to 5 with formic acid, add an ethanol solution with a mass percent concentration of 30% benzenesulfonyl chloride, the molar ratio of benzenesulfonyl chloride and thiourea is 0.04:1, Continue the reaction at 75°C for 4 minutes; cool down to 60°C, adjust the pH value of the solution to 7.5 with a 20% sodium hydroxide aqueous solution by mass percentage, and then cool down to 25°C to produce a thiourea A group of water-soluble polymer chelating agents.

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Abstract

The invention discloses a water-solubility macromolecular chelant containing sulfourea group and a preparation method thereof. The chelant of the invention is prepared by the following method: (a) adjusting the pH value of formaldehyde with acid liquor to activate the formaldehyde; (b) adding the sulfourea, adjusting the pH value with alkali, and reacting at the temperature of 75-90 DEG C; (c) adjusting the pH value with the acid, adding the alcoholic solution of benzene sulfonyl chloride to react at 70-90 DEG C; (d) reducing temperature to 50-60 DEG C, adjusting the pH value with the alkali, and reducing the temperature to below 40 DEG C to prepare the chelant. The chelant of the invention has chelation sedimentation function to almost all of the transition stated heavy metals, which can not only be used in the treatment of the heavy metal sewage containing copper, zinc, nickel, mercury, cadmium, and the like, but also can be used in the stabilization treatment of the heavy metal in the solid wastes such as mud, waste incineration flying ashes, and the like. The preparation method of the invention has the advantages of no need of high temperature and high voltage, low one-time investment, easy availability of raw materials, and zero waste gas, waste liquid and waste residue in the production process.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a water-soluble polymer chelating agent containing thiourea group, its preparation method and application. Background technique [0002] Chelating resins containing S and N ligands, especially thiourea-based chelating resins, have excellent adsorption properties for metal ions, and can selectively adsorb precious metals such as gold, silver, platinum, palladium, and heavy metals such as mercury, lead, and copper. ion. Organic sulfur and nitrogen compounds generally have the properties of soft bases or intermediate bases, while most noble metal and heavy metal ions are intermediate acids, so they are easy to form stable chelates. The synthesis method of the chelating resin containing thiourea group can be either the polymerization of monomers containing functional groups, or the introduction of functional groups through polymer reactions on synthetic or natural polymer chain...

Claims

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Application Information

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IPC IPC(8): C08G12/40C08G12/12C02F1/62C02F11/00B01J20/26
Inventor 纪涛
Owner TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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