Salt-sensitive flocculating agent as well as preparation method and application thereof

A flocculant and sensitive technology are applied in the field of salt-sensitive flocculants and their preparation to achieve the effects of low regeneration cost and simple and easy regeneration method.

Inactive Publication Date: 2019-07-23
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Salt-sensitive polymers are also an important class of environmental stimulus-responsive polymer materials, but the use of salt-sensitive flocculants to achieve flocculant regeneration and recycling has not been reported.

Method used

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  • Salt-sensitive flocculating agent as well as preparation method and application thereof
  • Salt-sensitive flocculating agent as well as preparation method and application thereof
  • Salt-sensitive flocculating agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a. According to the mass ratio of p-aminobenzoic acid and cyanuric chloride 1:1.5, pour cyanuric chloride into a three-necked round-bottomed flask, add 100ml deionized water, stir at 0°C, press sodium hydroxide and cyanuric chloride The mass ratio of p-aminobenzoic acid and sodium hydroxide is 1:1.7. Dissolve p-aminobenzoic acid and sodium hydroxide in 50ml of deionized water, and add it dropwise into a three-necked round-bottomed flask. Stir continuously at a temperature of 0°C. After reacting for 30 minutes, heat up to room temperature. Stir the reaction for 3 hours, then use 3M HCL to adjust the pH to 4.6 to obtain a white precipitate, then filter it with suction, remove most of the water in a blast oven at 60°C, then dry it in a vacuum oven at 60°C for 6 hours, and grind to obtain a white precipitate Intermediate 2,4-bis(p-aminobenzoyl)-6-chloro-[1,3,5]-triazine;

[0031] b. According to the mass ratio of 2,4-bis(p-aminobenzoic acid)-6-chloro-[1,3,5]-triazine to sta...

Embodiment 2

[0035] a. According to the mass ratio of p-aminobenzoic acid and cyanuric chloride 1:1.5, pour cyanuric chloride into a three-necked round-bottomed flask, add 100ml deionized water, stir at 0°C, press sodium hydroxide and cyanuric chloride The mass ratio of p-aminobenzoic acid and sodium hydroxide is 1:1.7. Dissolve p-aminobenzoic acid and sodium hydroxide in 50ml of deionized water, and add it dropwise into a three-necked round-bottomed flask. Stir continuously at a temperature of 1°C. After reacting for 30 minutes, heat up to room temperature , stirred and reacted for 3 hours, and then adjusted the pH to 4.6 with 3M HCL to obtain a white precipitate, which was then filtered with suction. The filter cake was first removed with a blast oven at 60°C to remove most of the water, then dried with a vacuum oven at 60°C for 6 hours, and ground to obtain White intermediate 2,4-di(p-aminobenzoic acid group)-6-chloro-[1,3,5]-triazine, wherein the mass ratio of p-aminobenzoic acid and cy...

Embodiment 3

[0040] a. According to the mass ratio of p-aminobenzoic acid and cyanuric chloride as 1:1.5, pour cyanuric chloride into a three-necked round-bottomed flask, add 100ml deionized water, stir at 0°C, and press sodium hydroxide and cyanuric chloride The mass ratio of cyanogen chloride is 1:1.7. Dissolve p-aminobenzoic acid and sodium hydroxide in 50ml of deionized water, and add it dropwise into a three-necked round-bottomed flask. Stir continuously at a temperature of 5°C. After reacting for 30 minutes, heat up to room temperature, stirred and reacted for 3 hours, then adjusted the pH to 4.6 with 3M HCL to obtain a white precipitate, and then filtered it with suction. The filter cake was first removed with a blast oven at 60°C to remove most of the water, then dried in a vacuum oven at 60°C for 6 hours, and ground , to obtain the white intermediate 2,4-bis(p-aminobenzoyl)-6-chloro-[1,3,5]-triazine;

[0041] b. According to the mass ratio of 2,4-bis(p-aminobenzoic acid)-6-chloro-...

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Abstract

The invention discloses a salt-sensitive flocculating agent as well as a preparation method and application thereof. The salt-sensitive flocculating agent is 2,4-di(p-aminobenzoyloxy)-[1,3,5]-triazine-6-starch ether and is prepared through the following steps: uniformly mixing p-aminobenzoic acid, sodium hydroxide and cyanuric chloride; adding de-ionized water; raising the temperature to room temperature and regulating the pH (Potential of Hydrogen) value to be 4.6, so as to obtain white sediment; filtering, and drying and grinding a filter cake to obtain a white intermediate, i.e., 2,4-di(p-aminobenzoyloxy)-6-chloro-[1,3,5]-triazine; then mixing starch, the sodium hydroxide, the 2,4-di(p-aminobenzoyloxy)-6-chloro-[1,3,5]-triazine and dimethyl sulfoxide; heating, stirring and cooling to room temperature; adding ethanol and separating out a product; filtering and drying to obtain the salt-sensitive flocculating agent, i.e., the 2,4-di(p-aminobenzoyloxy)-[1,3,5]-triazine-6-starch ether.The salt-sensitive flocculating agent disclosed by the invention is used fro removing anionic dyestuff in dyestuff wastewater, and the salt-sensitive flocculating agent can be regenerated and cyclically used in a salt solution after being used for flocculating the dyestuff, so that the wastewater treatment cost is reduced and the regenerated flocculating agent can be cyclically used for a plurality of times.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing wastewater treatment, in particular to a salt-sensitive flocculant and its preparation method and application. Background technique [0002] With the rapid development of the domestic printing and dyeing industry, more and more dyes are discharged into the environment, and their toxicity has caused great harm to the human environment. How to effectively eliminate dyes in water is a prominent environmental problem facing the world today. For the industrial treatment methods of printing and dyeing wastewater, there are mainly precipitation methods, membrane filtration methods, electrolysis methods, adsorption and other treatment methods. Among them, flocculation is recognized as a water treatment method with high efficiency and good benefits. [0003] The flocculation method has the advantages of simple equipment and easy maintenance and operation. It is also one of the sewage treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/08C02F1/52C02F1/56
CPCC02F1/5263C02F1/56C02F2101/308C08B31/08
Inventor 魏婷婷陈龙史玉琳吕恒崔欣宇冯婧胡洋代斌
Owner SHIHEZI UNIVERSITY
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