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Preparation method and product of modified corn starch chelating agent

A technology of corn starch and chelating agent, applied in the field of fine chemicals, can solve the problems of easy breakage, limitation of grafting rate of grafted products, high reaction temperature, etc., achieve strong chelating ability, reduce production cost, and high grafting rate Effect

Inactive Publication Date: 2016-11-16
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional method of producing modified starch chelating agent, the reaction temperature adopted is higher (greater than 50° C.), which makes the glucoside therein easy to break under alkaline reaction conditions, thereby causing the grafting rate of the grafted product to be limited.

Method used

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  • Preparation method and product of modified corn starch chelating agent

Examples

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preparation example Construction

[0021] The first aspect of the present invention provides a kind of preparation method of modified cornstarch chelating agent, it comprises the following steps:

[0022] (1) 1 weight part of cornstarch is dissolved in 100 weight parts of deionized water, the reaction vessel is evacuated, and nitrogen is vented to keep the nitrogen atmosphere;

[0023] (2) Slowly add 10 to 20 parts by weight of fresh ammonium cerium sulfate-nitric acid solution dropwise to the above-mentioned reaction vessel; in addition, 5 to 15 parts by weight of glycidyl methacrylate are dissolved in deionized water, and then This aqueous solution of glycidyl methacrylate is added in the above-mentioned reaction vessel;

[0024] (3) Keep the nitrogen atmosphere, react the reaction solution in the above-mentioned reaction vessel at a temperature of 5-20°C for 0.3-1.2h, and then neutralize the reaction solution with an ethanol solution of alkali;

[0025] (4) filter cake is obtained by suction filtration, and...

Embodiment 1

[0035] (1) 1 weight part of cationic modified cornstarch is dissolved in 100 weight parts of deionized water, the reaction vessel is evacuated, nitrogen is ventilated, and nitrogen atmosphere is maintained;

[0036] (2) Slowly add 15 parts by weight of fresh ammonium cerium sulfate-nitric acid solution (concentration of nitric acid is 0.05mol / L) dropwise in the above reaction vessel; in addition, 10 parts by weight of glycidyl methacrylate are dissolved in an appropriate Deionized water, and then the aqueous solution of glycidyl methacrylate is added in the above-mentioned reaction vessel;

[0037] (3) Keep the nitrogen atmosphere, react the reaction solution in the above-mentioned reaction vessel at a temperature of 5 to 20° C. for 1 h, then neutralize the reaction solution with an ethanol solution of sodium hydroxide (wherein the concentration of sodium hydroxide is 0.05mol / L), A white precipitate can be seen;

[0038] (4) filter cake is obtained by suction filtration, the ...

Embodiment 2

[0041] (1) 1 weight part of cation-modified cornstarch is dissolved in 100 weight parts of deionized water, the reaction vessel is evacuated, nitrogen is vented, and nitrogen atmosphere is maintained;

[0042] (2) Slowly add 10 parts by weight of fresh ammonium cerium sulfate-nitric acid solution (concentration of nitric acid is 0.05mol / L) dropwise to the above reaction vessel; in addition, 7 parts by weight of glycidyl methacrylate are dissolved in an appropriate amount Deionized water, and then the aqueous solution of glycidyl methacrylate is added in the above-mentioned reaction vessel;

[0043] (3) Keep the nitrogen atmosphere, react the reaction solution in the above reaction vessel at a temperature of 5-20°C for 1.2h, and then neutralize the reaction solution with an ethanol solution of sodium hydroxide (wherein the concentration of sodium hydroxide is 0.05mol / L) , a white precipitate can be seen;

[0044] (4) filter cake is obtained by suction filtration, and described...

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Abstract

The invention discloses a preparation method and a product of a modified corn starch chelating agent. The preparation method comprises the following steps: corn starch is subjected to a reaction with a certain amount of an ammonium ceric sulfate-nitric acid solution and glycidyl methacrylate at a lower temperature, glycidyl methacrylate grafted corn starch with a higher grafting ratio is obtained firstly, then the grafting product is subjected to an amination reaction with diethylenetriamine, and a target product, namely, the modified corn starch chelating agent is obtained finally. The production energy consumption and the production cost are reduced effectively by means of the preparation method; due to the higher grafting ratio, the modified corn starch chelating agent has better grafting effect, is more stable and has higher chelating capacity, thereby having broad application prospect and market potential.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a preparation method of a modified cornstarch chelating agent and a product thereof. Background technique [0002] Starch is a polysaccharide polymer whose yield is second only to cellulose in nature. The modification of starch is mainly to use the chemical activity of hydroxyl groups in starch molecules to react with chemical reagents to obtain a variety of modified products with their own properties and uses. permanent starch. The modified starch heavy metal treatment agent developed in recent years, also known as modified starch chelating agent, brings vitality to the treatment of heavy metal wastewater by virtue of its strong chelating ability with heavy metals. Using starch as raw material, the chelating agent prepared through a series of reactions can chelate with heavy metal ions; its special functional group has the ability to adsorb heavy metal ions; and, it sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/32C08F8/32B01J20/26
CPCB01J20/261C08F8/32C08F251/00C08F220/325
Inventor 施晓旦杨刚邵威金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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