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A kind of synthetic method and application of cationic modified gamma-polyglutamic acid

A technology of polyglutamic acid and synthesis method, which is applied in the field of water treatment, can solve the problems of carcinogenicity, aggravation, and mutagenesis, and achieve the effect of promoting flocculation and sedimentation

Active Publication Date: 2019-04-12
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Inorganic flocculants are cheap, but they are used in large amounts, and some are harmful to the ecological environment and human health; organic polymer flocculants are used in small amounts and have strong flocculation effects, but the residual monomers of commonly used acrylamide polymers have severe , carcinogenic, and mutagenic, so that the scope of use of organic polymer flocculants is greatly restricted

Method used

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  • A kind of synthetic method and application of cationic modified gamma-polyglutamic acid
  • A kind of synthetic method and application of cationic modified gamma-polyglutamic acid
  • A kind of synthetic method and application of cationic modified gamma-polyglutamic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The nucleophilic substitution reaction between γ-polyglutamic acid and 3-chloro-2-hydroxypropyltrimethylammonium chloride occurs, NaOH is used as a catalyst, and the reaction is carried out in water phase.

[0027] Synthesis of Cationic Modified γ-Polyglutamic Acid

[0028] Weigh 1g of γ-polyglutamic acid and add 10ml of distilled water into a 250ml round bottom flask, and stir evenly.

[0029] Weigh 20.26g of 3-chloro-2-hydroxypropyltrimethylammonium chloride solution (65% aqueous solution) (containing 0.07mol 3-chloro-2-hydroxypropyltrimethylammonium chloride) and place it in a beaker, spare.

[0030] Weigh 0.091mol (3.64g) of NaOH and add 10ml of water to dissolve in a beaker. spare.

[0031] Fix the round-bottomed flask dissolved in γ-polyglutamic acid aqueous solution in a collector-type constant temperature heating magnetic stirrer, the reaction temperature is 50°C, swell for 1 hour, and then use a dropper to drop the etherification agent for 5 minutes. After 5...

Embodiment 2

[0037] The nucleophilic substitution reaction between γ-polyglutamic acid and 3-chloro-2-hydroxypropyltrimethylammonium chloride occurs, NaOH is used as a catalyst, and the reaction is carried out in water phase.

[0038] Synthesis of Cationic Modified γ-Polyglutamic Acid

[0039] Weigh 1g of γ-polyglutamic acid and add 10ml of distilled water into a 250ml round bottom flask, and stir evenly.

[0040] Weigh 0.04mol (11.57g) of 3-chloro-2-hydroxypropyltrimethylammonium chloride (65% aqueous solution) into a beaker and set aside.

[0041] Weigh 0.052mol (2.08g) of NaOH and add 10ml of water to dissolve in a beaker. spare.

[0042] Fix the round-bottomed flask dissolved in γ-polyglutamic acid aqueous solution in a collector-type constant temperature heating magnetic stirrer, the reaction temperature is 50°C, swell for 1 hour, and then use a dropper to drop the etherification agent for 5 minutes. After 5 minutes, Add the NaOH solution dropwise in another 3 minutes, and react fo...

Embodiment 3

[0049] The nucleophilic substitution reaction between γ-polyglutamic acid and 3-chloro-2-hydroxypropyltrimethylammonium chloride occurs, NaOH is used as a catalyst, and the reaction is carried out in water phase.

[0050] Synthesis of Cationic Modified γ-Polyglutamic Acid

[0051] Weigh 1g of γ-polyglutamic acid and add 10ml of distilled water into a 250ml round bottom flask, and stir evenly.

[0052] Weigh 0.07mol (20.26g) of 3-chloro-2-hydroxypropyltrimethylammonium chloride (65% aqueous solution) into a beaker and set aside.

[0053] Weigh 0.091mol (3.64g) of NaOH and add 10ml of water to dissolve in a beaker. spare.

[0054] Fix the round-bottomed flask dissolved in γ-polyglutamic acid aqueous solution in a collector-type constant temperature heating magnetic stirrer, the reaction temperature is 50°C, swell for 1 hour, and then use a dropper to drop the etherification agent for 5 minutes. After 5 minutes, Add NaOH solution dropwise in 3 minutes and react for 3 hours.

...

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Abstract

The invention relates to a synthesis method of cation modified gamma-polyglutamic acid and application thereof. The method comprises the following steps that (1) gamma-polyglutamic acid is added into a reaction kettle filled with distilled water; stirring is performed; (2) an etherifying agent of 3-chlorine-2-hydroxypropyl trimethyl ammonium chloride and NaOH are respectively dissolved into water to respectively obtain an etherifying agent solution and alkali liquor; a gamma-polyglutamic acid water solution in the step (1) is subjected to swelling; then, the etherifying agent solution is dripped, and then the NaOH solution is dripped; cooling, precipitation, refrigeration and drying are performed; finally, a cation modified gamma-polyglutamic acid flocculant is obtained. The prepared cation modified gamma-polyglutamic acid has an obvious flocculating settling effect on seawater; the turbidity removal rate being 89 percent or higher can be reached when the dosing quantity is 2mg / L; the cation modified gamma-polyglutamic acid is an environmental-friendly flocculant.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method of a cationic modified flocculant and research on its flocculation effect in seawater. Background technique [0002] With the continuous growth of the world population and the continuous development of modern industrialization, the human demand for water resources is constantly increasing, coupled with the unreasonable development of fresh water resources and the continuous destruction of the ecological environment, many countries and regions have emerged water scarcity to varying degrees. In order to solve the shortage of terrestrial fresh water resources and chemical mineral resources, various countries and regions are actively developing seawater desalination technology and seawater direct utilization technology. However, the composition of seawater is relatively complex, especially the seawater near the coast contains a large number of suspended ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/48C02F1/56
CPCC02F1/56C08G69/48
Inventor 陈建新董志鹏韩健苏敏李银辉卢爱党
Owner HEBEI UNIV OF TECH
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