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

Multi-carboxyl chelating agent as well as preparation method and application thereof

A chelating agent and polycarboxyl technology, applied in the field of polycarboxyl chelating agents and their preparation, can solve the problems of poor solubility of large molecular weight chelating agents, reducing the use of chemicals, large metal complex flocs, etc., and reducing the use of chemicals. Use, good sedimentation, excellent solubility

Active Publication Date: 2020-08-25
SHAANXI UNIV OF SCI & TECH
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of poor solubility of large molecular weight chelating agents in the prior art, the object of the invention is to provide a kind of polycarboxy chelating agent and its preparation method and application. Solubility, because the metal complex flocs formed by multiple carboxyl chelating groups and heavy metals are larger, they can settle well without the use of flocculants, reducing the use of chemicals in the chelation precipitation process

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
  • Multi-carboxyl chelating agent as well as preparation method and application thereof
  • Multi-carboxyl chelating agent as well as preparation method and application thereof
  • Multi-carboxyl chelating agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] Concrete, a kind of preparation method of polycarboxylate chelating agent comprises the following steps:

[0032] (1) Add dipentaerythritol and propionyl chloride into a three-necked flask, wherein the molar ratio of dipentaerythritol and propionyl chloride is 1:(3-3.1). After the addition is complete, stir the reaction at 35-45°C for 2-4 hours, and cool to room temperature. Neutralize with sodium hydroxide solution, wherein the concentration of the sodium hydroxide solution is 3-6% (mass fraction). Wash with water, extract with an organic solvent, and distill off the solvent under reduced pressure to obtain viscous liquid intermediate Ⅰ.

[0033] (2) Add the viscous liquid intermediate I obtained in step (1) into a four-necked flask, and the added amount of the viscous liquid intermediate I is 0.025 mol. Then add the first solvent dimethyl sulfoxide (DMSO) into the four-neck flask, and the added amount is 100 mL. After all the powder is dissolved, add powdered sodiu...

Embodiment 1

[0038] Add dipentaerythritol and propionyl chloride into a three-necked flask at a molar ratio of 1:3. After the addition is complete, stir and react at 40°C for 3h, and cool to room temperature. Neutralize with 5% (mass fraction) sodium hydroxide solution, wash with water, extract with organic solvent, and distill off the solvent under reduced pressure to obtain viscous liquid intermediate I. Take 0.025mol of the viscous liquid intermediate I and add it to the four-necked flask, then add 100mL dimethyl sulfoxide (DMSO) into the four-necked flask, and after it is completely dissolved, add 4g of powdered sodium hydroxide and stir the reaction at 30°C 0.5h, then add 0.05mol sodium chloroacetate into the solution containing dimethyl sulfoxide and other solvents, raise the temperature to 80°C, and react for 6h, then filter the above solution with suction to obtain the solid product Intermediate II. Add 0.02mol of solid product Intermediate II to 21.93g of dimethylformamide (DMF), ...

Embodiment 2

[0040]Add dipentaerythritol and propionyl chloride into a three-necked flask at a molar ratio of 1:3.02. After the addition is complete, stir and react at 40°C for 3h, and cool to room temperature. Neutralize with 5% (mass fraction) sodium hydroxide solution, wash with water, extract with organic solvent, and distill off the solvent under reduced pressure to obtain viscous liquid intermediate I. Take 0.025mol of the viscous liquid intermediate I and add it to the four-necked flask, then add 100mL dimethyl sulfoxide (DMSO) into the four-necked flask, and after it is completely dissolved, add 4g of powdered sodium hydroxide and stir the reaction at 30°C 0.5h, then add 0.05mol sodium chloroacetate into the solution containing dimethyl sulfoxide and other solvents, raise the temperature to 80°C, and react for 6h, then filter the above solution with suction to obtain the solid product Intermediate II. Add 0.02mol of solid product Intermediate II to 21.93g of dimethylformamide (DMF)...

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 discloses a multi-carboxyl chelating agent as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) adding dipentaerythritol andpropionyl chloride into a three-neck flask to obtain a viscous liquid intermediate I; (2) adding the viscous liquid intermediate I obtained in the step (1) into a four-neck flask, then adding a firstsolvent dimethyl sulfoxide into the four-neck flask, and then adding sodium chloroacetate into a solution containing solvents such as dimethyl sulfoxide to obtain a solid product intermediate II; and(3) adding the solid product intermediate II in the step (2) into a second solvent dimethylformamide, and adding hexamethylene diisocyanate (HDI) under magnetic stirring to obtain the multi-carboxylchelating agent. According to the preparation method of the multi-carboxyl chelating agent, the heavy metal chelating agent with dual functions of flocculation and chelating is successfully prepared.

Description

technical field [0001] The invention relates to the field of fine chemical water treatment, in particular to a polycarboxyl chelating agent and its preparation method and application. Background technique [0002] Heavy metals seriously damage the natural environment. The heavy metals in water mainly come from mining, metal smelting, chemical production wastewater, the use of pesticides and fertilizers, and domestic garbage. Heavy metals are discharged into the environment, because it is difficult to remove them through chemical degradation or biodegradation, thus polluting the environment. Humans are at the top of the food chain, and these heavy metals are easily passed through the food chain and finally enriched in the human body. The current treatment methods for heavy metals in wastewater include sulfide precipitation, reduction, bioflocculation, phytoremediation, etc. Each method has its advantages and limitations, and these methods are mostly affected by technical and...

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): C07C271/20C07C269/02C07C67/14C07C67/31C07C69/33C02F1/54C02F1/28C02F1/62C02F101/20
CPCC02F1/285C02F1/54C02F1/62C02F2101/20C07C67/14C07C67/31C07C269/02C07C271/20C07C69/33
Inventor 郭丽媛李小瑞王晨侯妍杨晓武李刚辉
Owner SHAANXI UNIV OF SCI & TECH
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com