Biological flocculant and preparation method thereof

A biological flocculant and etherification agent technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., to achieve excellent solubility, obvious flocculation effect, and mild reaction conditions Effect

Inactive Publication Date: 2017-07-18
SHAANXI BANGXI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing cationic starch flocculants cannot carry out good flocculation treatment for sewage with complex components of positive and negative charges and colloids at the same time

Method used

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  • Biological flocculant and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Dissolve NaOH in water, cool to room temperature, add etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride (CTA), and spray the solution containing NaOH and CTA on the dry starch , and stirred to make it evenly mixed, reacted at 70°C for 4 hours, then washed 2-5 times with 60% ethanol, and vacuum dried to prepare cationic starch; wherein, the molar ratio of NaOH to etherifying agent CTA is 1.5, the molar ratio of etherification agent CTA and dry starch is 0.45, and the mass fraction of water in the whole reaction system is 30%;

[0051] (2) Mill the cationic starch obtained in step (1) on a ball mill to obtain mechanically activated cationic starch, dissolve the mechanically activated cationic starch in water, heat it to gelatinize for 20 minutes, and then add the The liquid paraffin of the composite emulsifier is stirred with nitrogen gas, emulsified for 1 hour, and then the composite initiator ammonium persulfate-sodium bisulfite with an amount of ...

Embodiment 2

[0053] (1) Dissolve NaOH in water, cool to room temperature, add etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride (CTA), and spray the solution containing NaOH and CTA on the dry starch , and stirred to make it evenly mixed, reacted at 60°C for 6h, then washed 2-5 times with 60% ethanol, and vacuum dried to prepare cationic starch; wherein, the molar ratio of NaOH to etherifying agent CTA 0.8, the molar ratio of etherification agent CTA and dry starch is 0.2, and the mass fraction of water in the whole reaction system is 20%;

[0054] (2) Mill the cationic starch obtained in step (1) on a ball mill to obtain mechanically activated cationic starch, dissolve the mechanically activated cationic starch in water, heat it to make it gelatinize for 20 minutes, and then add the The liquid paraffin of the composite emulsifier is stirred with nitrogen gas, emulsified for 1 hour, and then the composite initiator ammonium persulfate-sodium bisulfite with an amount of 2...

Embodiment 3

[0056] (1) Dissolve NaOH in water, cool to room temperature, add etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride (CTA), and spray the solution containing NaOH and CTA on the dry starch , and stirred to make it evenly mixed, reacted at 80°C for 4 hours, then washed 2-5 times with 60% ethanol, and vacuum dried to prepare cationic starch; wherein, the molar ratio of NaOH to etherifying agent CTA is 1.5, the molar ratio of etherification agent CTA and dry starch is 0.6, and the mass fraction of water in the whole reaction system is 25%;

[0057] (2) Mill the cationic starch obtained in step (1) on a ball mill to obtain mechanically activated cationic starch, dissolve the mechanically activated cationic starch in water, heat it to make it gelatinize for 20 minutes, and then add The liquid paraffin of the composite emulsifier is stirred with nitrogen gas, emulsified for 1 hour, and then the compound initiator ammonium persulfate-sodium bisulfite with an amount o...

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Abstract

The invention provides a biological flocculant and a preparation method thereof. The preparation method comprises the following steps: acquiring cationic starch by adopting a semi-dry process for performing cationization treatment on starch, and by taking acrylamide and sodium acrylate as monomers, adopting an inverse emulsion polymerization method for performing graft copolymerization and anionizing treatment on the cationic starch, thereby acquiring the biological flocculant. The flocculation effect of the biological flocculant prepared according to the preparation method provided by the invention is better than that of common cationic starch; the biological flocculant is more effective in flocculating the wastewater containing complex components; the quantity and variety of the charges carried by amphoteric starch can be changed in the manner of regulating the pH value of the solution; and the use scope of the product is widened.

Description

technical field [0001] The invention relates to the technical field of water supply and sewage treatment, and more specifically, to a biological flocculant and a preparation method thereof. Background technique [0002] Flocculants are widely used in technical fields such as water supply and sewage treatment. The amount of inorganic flocculants currently used is large, and inorganic metal salts increase the metal content in sludge, which is not conducive to the later reuse of sludge. Compared with inorganic flocculants, organic polymer flocculants are used in less amounts and have obvious flocculation effects, and have a wider range of applications, and have gradually replaced inorganic flocculants. Organic polymer flocculants are divided into organic synthetic polymer flocculants and natural polymer flocculants. Among them, organic synthetic polymer flocculants are expensive, not easy to biodegrade, and the residual monomers are also toxic, which is limited in practical ap...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F220/06C08F2/32C08B31/12C02F1/56
CPCC08F251/00C02F1/5272C02F1/56C08B31/125C08F2/32C08F220/56
Inventor 张永欣解朵
Owner SHAANXI BANGXI CHEM
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