Flocculant and preparation method therefor

A flocculant and initiator technology, applied in the field of flocculants and their preparation, can solve problems such as the increase of free formaldehyde, and achieve the effects of reduced formaldehyde emission, good effect and wide application range

Active Publication Date: 2018-03-16
广州安达净水材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing organic polymer flocculants are polymers of acrylamide and modified copolymers or homopolymers of acrylamide, whose function is basically flocculation; and in the process of water treatment, adding decolorizing flocculants to decolorize wastewater Treatment is also a relatively common treatment method, but the decolorizing flocculant is mostly the condensation product of dicyandiamide formaldehyde, and the free formaldehyde in the product will increase with time

Method used

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  • Flocculant and preparation method therefor

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Effect test

Embodiment 1

[0030] The present embodiment provides a preparation method of a flocculant, which comprises the following steps:

[0031] S1) add acrylamide, quaternary ammonium salt monomer, amine, aldehyde, complexing agent, cosolvent and water to the reactor, and stir;

[0032] S2) adjust the temperature in the reactor to 5°C, and feed nitrogen into the reactor; after the nitrogen is passed in for at least 20 minutes, add initiator A to the reactor; after 20 minutes of reaction, continue to add initiator B to the reactor; After adding B, stop feeding nitrogen and continue to react for 5h;

[0033] S3) raising the temperature in the reactor to 35°C, and adding the catalyst dropwise to the reactor after 5h; after adding the catalyst, raising the temperature in the reactor to 60°C and reacting for 5h;

[0034] S4) adding etherifying agent to the reactor, after reacting for 3h, the flocculant is obtained;

[0035] The mass concentration of acrylamide in the mixture is 15.75%, the mass conce...

Embodiment 2

[0040] The present embodiment provides a preparation method of a flocculant, which comprises the following steps:

[0041] S1) add acrylamide, quaternary ammonium salt monomer, amine, aldehyde, complexing agent, cosolvent and water to the reactor, and stir;

[0042] S2) adjust the temperature in the reactor to 20°C, and feed nitrogen into the reactor; after the nitrogen is fed for at least 20 minutes, add initiator A to the reactor; after 13 minutes of reaction, continue to add initiator B to the reactor; After adding B, stop feeding nitrogen and continue to react for 3h;

[0043] S3) raising the temperature in the reactor to 40°C, and adding the catalyst dropwise to the reactor after 3.5 hours; after adding the catalyst, raising the temperature in the reactor to 80°C, and reacting for 4 hours;

[0044] S4) adding an etherifying agent to the reactor, and reacting for 2h to obtain a flocculant;

[0045] The mass concentration of acrylamide in the mixture is 17.5%, the mass conc...

Embodiment 3

[0050] The present embodiment provides a preparation method of a flocculant, which comprises the following steps:

[0051] S1) add acrylamide, quaternary ammonium salt monomer, amine, aldehyde, complexing agent, cosolvent and water to the reactor, and stir;

[0052] S2) adjust the temperature in the reactor to 25°C, and feed nitrogen into the reactor; after the nitrogen is passed in for at least 20 minutes, add initiator A to the reactor; after 10 minutes of reaction, continue to add initiator B to the reactor; After adding B, stop feeding nitrogen and continue to react for 2h;

[0053] S3) raising the temperature in the reactor to 50°C, and adding the catalyst dropwise to the reactor after 2 hours; after adding the catalyst, raising the temperature in the reactor to 90°C, and reacting for 2 hours;

[0054] S4) adding an etherifying agent to the reactor, and reacting for 1 h to obtain a flocculant;

[0055] The mass concentration of acrylamide in the mixture is 19.25%, the m...

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Abstract

The invention discloses a flocculant and a preparation method therefor and belongs to the technical field of wastewater. The preparation method comprises the following steps: adding acrylamide, a quaternary ammonium salt monomer, amine, aldehyde, a complexing agent, a cosolvent and water, and carrying out stirring and mixing; sequentially adding an initiator A and an initiator B, and carrying outa Mannich reaction and a methylolation reaction; and after the reaction, sequentially adding a catalyst and an etherifying agent, carrying out a polycondensation reaction and amino resin molecule terminal hydroxymethyl-terminating, thereby finally obtaining the cationic liquid flocculant. The flocculant prepared by the preparation method is good in decoloring and flocculating effect and wide in applicable range, and the secondary pollution caused by free formaldehyde can be reduced.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a flocculant and a preparation method thereof. Background technique [0002] Whether in life or production, human activities will produce a large amount of wastewater. The random discharge of waste water will not only cause waste of water resources, but also cause environmental pollution. For the treatment of sewage, organic cationic flocculants are widely used. The cationic organic flocculants on the market are water-soluble polymers with a certain strength of cation, higher molecular weight, better linear structure and better molecular weight. Chain flexibility. Different from inorganic flocculants, cationic organic flocculants dissolve in water and do not form flocs. Only after encountering suspended solids and colloids, they can combine with suspended solids in water and destabilized colloids to form flocs through electric neutralization, adsorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F226/02C08F220/34C08G12/42C02F1/56
CPCC02F1/56C08F220/34C08F220/56C08F226/02C08G12/421C08G12/427C08G12/428
Inventor 石宗武舒绪刚吴春丽
Owner 广州安达净水材料有限公司
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