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Synthesis method for gamma-polyglutamic acid flocculant modified through Mannich reaction and application of gamma-polyglutamic acid flocculant

A Mannich reaction, polyglutamic acid technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water treatment parameter control, etc., can solve secondary pollution, difficult to treat waste residue, human health and environment hazards, etc.

Active Publication Date: 2018-05-29
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flocculant can be divided into inorganic flocculant and organic flocculant. Although inorganic flocculant is cheap in price, it will cause harm to human health and the environment; It is difficult to dispose of waste residues, and it is easy to cause secondary pollution

Method used

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  • Synthesis method for gamma-polyglutamic acid flocculant modified through Mannich reaction and application of gamma-polyglutamic acid flocculant
  • Synthesis method for gamma-polyglutamic acid flocculant modified through Mannich reaction and application of gamma-polyglutamic acid flocculant
  • Synthesis method for gamma-polyglutamic acid flocculant modified through Mannich reaction and application of gamma-polyglutamic acid flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mannich reaction occurs with gamma-polyglutamic acid, diethanolamine and formaldehyde, and reacts in water phase.

[0027] Synthesis of modified γ-polyglutamic acid flocculant by Mannich reaction

[0028] Weigh 2g of γ-polyglutamic acid (molecular weight is about 300,000)

[0029] Add 20ml of deionized water into a 150ml round bottom flask and stir evenly.

[0030] Weigh 0.08 mol (8.41 g) of diethanolamine (mass fraction ≥ 99%) and place it in a test tube for use.

[0031] Weigh 0.1 mol of formaldehyde solution (37% aqueous solution) (8.11 g) and place it in a test tube for use.

[0032] Place the round-bottomed flask containing the γ-polyglutamic acid solution in a heat-collecting constant temperature heating magnetic stirrer, add the diethanolamine to be used, heat and stir until the temperature rises to 70°C, add formaldehyde solution dropwise, and react 4 hours, a mixture was obtained. After the reaction, the mixed solution was placed in a 250ml beaker and natur...

Embodiment 2

[0038] Mannich reaction occurs with gamma-polyglutamic acid, diethanolamine and formaldehyde, and reacts in water phase.

[0039] Synthesis of modified γ-polyglutamic acid flocculant by Mannich reaction

[0040] Weigh 2g of γ-polyglutamic acid and add 20ml of deionized water into a 150ml round bottom flask, and stir evenly.

[0041] Weigh 0.08 mol (8.41 g) of diethanolamine (mass fraction ≥ 99%) and place it in a test tube for use.

[0042] Weigh 0.1 mol (8.11 g) of formaldehyde solution (37% aqueous solution) and place it in a test tube for use.

[0043] Place the round-bottomed flask containing the γ-polyglutamic acid solution in a heat-collecting constant temperature heating magnetic stirrer, add the diethanolamine to be used, heat and stir until the temperature rises to 60°C, add formaldehyde solution dropwise, and react 3 hours, a mixture was obtained. After the reaction, the mixed solution was placed in a 250ml beaker and naturally cooled to room temperature, and 5 ti...

Embodiment 3

[0049] Mannich reaction occurs with gamma-polyglutamic acid, diethanolamine and formaldehyde, and reacts in water phase.

[0050] Synthesis of modified γ-polyglutamic acid flocculant by Mannich reaction

[0051] Weigh 2g of γ-polyglutamic acid and add 20ml of deionized water into a 150ml round bottom flask, and stir evenly.

[0052] Weigh 0.08 mol (8.41 g) of diethanolamine (mass fraction ≥ 99%) and place it in a test tube for use.

[0053] Weigh 0.04mol (3.28g) of formaldehyde solution (37% aqueous solution) and place it in a test tube for use.

[0054] Place the round-bottomed flask containing the γ-polyglutamic acid solution in a heat-collecting constant temperature heating magnetic stirrer, add the diethanolamine to be used, heat and stir until the temperature rises to 60°C, add formaldehyde solution dropwise, and react 3 hours, a mixture was obtained. After the reaction, the mixed solution was placed in a 250ml beaker and naturally cooled to room temperature, and 5 tim...

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Abstract

The invention discloses a synthesis method for gamma-polyglutamic acid flocculant modified through Mannich reaction and application of the gamma-polyglutamic acid flocculant. The method comprises thefollowing steps: adding diethanol amine into a gamma-polyglutamic acid solution, then dropwise adding a formaldehyde solution, reacting to obtain a mixed solution, cooling the mixed solution to the room temperature, and adding alcohol to obtain precipitates; after precipitating is completely performed, filtering, washing the precipitates with absolute ethyl alcohol, and performing vacuum drying toobtain the gamma-polyglutamic acid flocculant modified through the Mannich reaction. The cationic modified gamma-polyglutamic acid flocculant obtained through the synthesis method disclosed by the invention belongs to a microbial flocculant, biological degradation is easy to occur, the degradation product is glutamic acid, no influence on the health of human body is generated, and the gamma-polyglutamic acid flocculant belongs to an environment-friendly type flocculant.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method of a gamma-polyglutamic acid flocculant modified by Mannich reaction and a study on its flocculation effect in seawater. Background technique [0002] In recent years, the shortage of fresh water resources and chemical mineral resources in the world has been very serious. In order to effectively solve the crisis of the shortage of land fresh water resources and the dwindling mineral resources, all countries are making great efforts to develop marine resources. Seawater can not only provide humans with inexhaustible freshwater resources through seawater desalination technology, but also store a large number of chemical mineral resources in seawater. Seawater desalination technology is the process of removing the salt in seawater to obtain fresh water. Seawater desalination technology, as a high-tech technology to open up new water sources, has become ...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/56C08G69/50C08G69/48C02F103/08
CPCC02F1/5263C02F1/56C02F2103/08C02F2209/11C08G69/48C08G69/50
Inventor 陈建新董志鹏韩健苏敏李银辉
Owner HEBEI UNIV OF TECH
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