Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Synthesis method of bis-sulfydryl chelating agent for processing heavy metal complex wastewater

A double-mercapto-type, synthetic method technology, applied in chemical instruments and methods, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems such as the treatment effect is not obvious, and the synthesis method is simple and easy High efficiency, high yield and fast precipitation rate

Active Publication Date: 2013-09-25
LEPING SAFELY PHARMA
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the traditional precipitation method is used to treat mineral processing wastewater and electroplating wastewater, the treatment effect is not obvious due to the presence of heavy metal ions in the form of complexes.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Synthesis method of bis-sulfydryl chelating agent for processing heavy metal complex wastewater
  • Synthesis method of bis-sulfydryl chelating agent for processing heavy metal complex wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: In 25g of 1,2-dichloroethane, add 10.0g of p-methylthiophenol, 11.3g of chlorosulfonic acid, react at 60°C for 4 hours, add 20mL of water, separate the liquid, and wash with water until medium property, dried and evaporated to dryness to obtain 16.8 g of yellow solid 5-methyl-2-mercapto-benzenesulfonyl chloride with a purity of 95%. Add 17.0g of 5-methyl-2-mercapto-benzenesulfonyl chloride and 21.4g of zinc powder into 20mL of water at 0°C, stir for 30min, add 59.0g of concentrated hydrochloric acid, heat to reflux for 2h, and steam distill to obtain white 4 -Methyl-2-mercaptothiophenol 11.8g, melting point 25-28°C, yield 98%.

Embodiment 2

[0018] Example 2: In 25g of chloroform, add 10.0g of p-methylthiophenol, 11.3g of chlorosulfonic acid, react for 3 hours at 70°C, add 20mL of water, separate the liquids, wash with water until neutral, dry, and evaporate to dryness , to obtain 17.0 g of yellow solid 5-methyl-2-mercapto-benzenesulfonyl chloride with a purity of 98%. Add 17.0g of 5-methyl-2-mercapto-benzenesulfonyl chloride and 21.9g of iron powder into 20mL of water at 0°C, stir for 30min, add 59.0g of concentrated hydrochloric acid, heat to reflux for 2.5h, and steam distill to obtain white 11.8g of 4-methyl-2-mercaptothiophenol, melting point 25-28°C, yield 98%.

Embodiment 3

[0019] Example 3: Add 10.0 g of p-methylthiophenol and 13.8 g of chlorosulfonic acid to 25 g of dichloromethane, react for 3.5 hours at 60° C., add 20 mL of water, separate the liquids, wash with water until neutral, and dry. Evaporate to dryness to obtain 16.5 g of yellow solid 5-methyl-2-mercapto-benzenesulfonyl chloride with a purity of 96%. Add 17.0 g of 5-methyl-2-mercapto-benzenesulfonyl chloride and 21.4 g of zinc powder into 20 mL of water at 0°C, stir for 30 min, add 59.0 g of concentrated hydrochloric acid, heat to reflux for 2 h, and steam distill to obtain white 4 -Methyl-2-mercaptothiophenol 11.8g, melting point 25-28°C, yield 98%.

[0020] The chelating agent obtained above is used for heavy metal complex wastewater treatment, and the treatment method is as follows:

[0021] Add the chelating agent p-methylthiophenol or 4-methyl-2-mercaptothiophenol to sodium hydroxide with an equal amount of substance, heat and melt until it turns into a yellow sodium salt. Ad...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a synthesis method of a bis-sulfydryl chelating agent for processing heavy metal complex wastewater and particularly provides a synthesis method for 4-methyl-2-mercaptothiophenol. The 4-methyl-2-mercaptothiophenol is the chelating agent and is prepared from the following steps of: carrying out chlorosulfonylation on methyl thiophenol in a proper organic solvent to obtain 5-methyl-2-mercapto-benzenesulfonyl chloride, and carrying out reduction by utilizing a reducing agent, so as to obtain the 4-methyl-2-mercaptothiophenol. A product obtained by utilizing the method is easily separated and is high in yield.

Description

technical field [0001] The invention relates to a method for synthesizing 4-methyl-2-mercaptothiophenol, a dimercapto-type chelating agent used for treating heavy metal complex wastewater, and belongs to the technical field of fine chemical production. Background technique [0002] In recent years, with the increase in the use of metal materials, the discharge of metal mine wastewater and mining wastewater is increasing day by day. If heavy metal wastewater is discharged directly without treatment, heavy metal ions in free water will seriously exceed the standard. Because metal ions are non-degradable, they will seriously exceed the standard of heavy metal content in the human body through bioaccumulation, posing a serious threat to people's health. [0003] At present, heavy metal wastewater treatment methods mainly include precipitation method, electrolysis method, membrane method, electrolysis method, ion exchange method, biological method and so on. Among them, the prec...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C321/26C07C319/02C02F1/54C02F101/20
Inventor 李侠过海斌陶仁江陶国来邱健杨杰
Owner LEPING SAFELY PHARMA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products