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Preparation method of high-polymer flocculatant EA-g-SA (ethyl acrylate-g-succinic anhydride) esterificaiton-oxidation cassava starch

A polymer flocculant and cassava starch technology, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve problems such as unsatisfactory flocculation effect, achieve excellent flocculation effect, process Safe, easy-to-operate results

Active Publication Date: 2017-12-29
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with cation-modified starches such as phosphate esters, xanthate esters, and carboxymethyl groups, the esterification reaction of succinic anhydride can be completed in the water phase without introducing inorganic molecules to achieve complete degradation, but its flocculation effect is not ideal

Method used

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  • Preparation method of high-polymer flocculatant EA-g-SA (ethyl acrylate-g-succinic anhydride) esterificaiton-oxidation cassava starch
  • Preparation method of high-polymer flocculatant EA-g-SA (ethyl acrylate-g-succinic anhydride) esterificaiton-oxidation cassava starch
  • Preparation method of high-polymer flocculatant EA-g-SA (ethyl acrylate-g-succinic anhydride) esterificaiton-oxidation cassava starch

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Experimental program
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Embodiment

[0053] (1) Weigh 9.0 g of tapioca starch and place it in a vacuum drying oven at 60° C. for 24 hours to constant weight to obtain tapioca starch on a dry basis.

[0054] (2) Weigh 6 g of dry base tapioca starch obtained in step (1) into a 250 mL four-neck flask, add 120 mL of reaction solvent distilled water, stir at room temperature for 15 minutes until uniform, and obtain tapioca starch suspension.

[0055] (3) Heat up the system in step (2) to 55° C., add 0.1 g of ferrous sulfate heptahydrate to the system; stir for 10 minutes and then add 1.8 mL of hydrogen peroxide solution with a mass fraction of 30%, react for 2 hours, and cool to room temperature to obtain the crude product of oxidized starch.

[0056] (4) the crude product obtained in step (3) was centrifuged for 15 minutes at a centrifugal speed of 2500r / min; then filtered through a Buchner funnel, the filter cake obtained was washed 3 times with 25mL mass fraction of 95% ethanol, and then placed Dried in a constant...

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Abstract

The invention discloses a preparation method of a high-polymer flocculatant EA-g-SA esterificaiton-oxidation cassava starch. The preparation method comprises performing oxidizing reaction on cassava starch in aqueous solvent with hydrogen peroxide as oxidizing agent, performing esterification action on the oxidized cassava and starch and succinic anhydride by taking distilled water as solvent and toluenesulfonic acid as catalyst to generate SA esterification-oxidation cassava starch; performing graft co-polymerization on the SA esterification-oxidation cassava starch and ethyl acrylate by taking ammonium persulfate as initiator to compound the compound modified starch type high-polymer flocculatant EA-g-SA esterificaiton-oxidation cassava starch. The prepared cassava starch derivative of the high-polymer flocculatant EA-g-SA esterificaiton-oxidation cassava starch can achieve excellent absorbing and flocculating effects on acid wastewater and corrosion and scale inhibiting effects on equipment.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing polymer flocculant EA-g-SA esterification-oxidized tapioca starch. Background technique [0002] Tapioca starch, as a polymer substance that stores most of the energy in plant roots, can be chemically modified by esterification, crosslinking, etherification, grafting, etc. according to the needs of practical applications, to obtain starch derivatives with unique physical and chemical properties. The polymer flocculant based on this kind of natural polysaccharide polymer has good biocompatibility. [0003] It has been reported that tapioca starch esterified with succinic anhydride (SA) introduces a cationic group into the molecular structure of original oxidized tapioca starch, which has good flocculation performance for anionic pollutants in sewage. Compared with cation-modified starches such as phosphate esters, xanthate esters, and carboxymethy...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/18C08B31/04C08B31/18C02F5/10
CPCC02F5/10C08B31/04C08B31/185C08F251/00C08F220/18
Inventor 李和平冯璇张淑芬胡英相龚俊张俊杨莹莹钱敬侠左凯
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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