A kind of preparation method of cross-linked acrylamide grafted starch

A technology of acrylamide and grafted starch, which is applied in the field of preparation of heavy metal collectors in industrial sewage treatment, can solve the problems of difficult discharging and wall sticking, and achieve the effects of easy discharging, lower viscosity and good flocculation

Inactive Publication Date: 2017-12-29
JIAXINGS AIERRUI ENVIRONMENTAL TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide a preparation method of cross-linked acrylamide grafted starch with simple process, high copper removal rate and good flocculation, which solves the problems of wall sticking and difficult discharge in the aqueous solution polymerization of the existing method, and at the same time Improve its ability to complex heavy metal ions

Method used

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  • A kind of preparation method of cross-linked acrylamide grafted starch
  • A kind of preparation method of cross-linked acrylamide grafted starch
  • A kind of preparation method of cross-linked acrylamide grafted starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] (1) Dissolve corn starch in 1% sodium chloride aqueous solution, the mass ratio of sodium chloride aqueous solution to corn starch is 1.5:1, add KOH aqueous solution with a mass fraction of 15%, and the mass ratio of KOH aqueous solution to corn starch is 1 : 75, react with epichlorohydrin in a cross-linking reactor, the cross-linking temperature is controlled at about 25°C, the reaction time is 3 hours, and the mass ratio of epichlorohydrin to corn starch is 1:50.

[0075] After the cross-linking reaction is finished, the pH value is adjusted to 6-7 with 2% hydrochloric acid, the neutralized reaction solution is filtered and washed, and the waste water is discharged to a waste water pool.

[0076] After testing, the sedimentation volume of the obtained cross-linked starch was 46mL.

[0077] (2) The cross-linked starch pregelatinization and graft copolymerization reaction adopts continuous reaction, and the preparation device used can be found in figure 1 , including a...

Embodiment 2

[0089] (1) Dissolve corn starch in 1% sodium chloride aqueous solution, the mass ratio of sodium chloride aqueous solution to corn starch is 1.5:1, add KOH aqueous solution with a mass fraction of 15%, and the mass ratio of KOH aqueous solution to corn starch is 1 : 75, react with epichlorohydrin in a cross-linking reactor, the pH of the system is 11, the cross-linking temperature is controlled at about 25°C, the reaction time is 3 hours, and the mass ratio of epichlorohydrin to corn starch is 1 :50.

[0090] After the cross-linking reaction is finished, the pH value is adjusted to 6-7 with 2% hydrochloric acid, the neutralized reaction solution is filtered and washed, and the waste water is discharged to a waste water pool.

[0091] After testing, the sedimentation volume of the obtained cross-linked starch was 46mL.

[0092] (2) The cross-linked starch pregelatinization and graft copolymerization reaction adopts figure 1 The preparation setup shown carries out a continuous...

Embodiment 3

[0097] (1) Dissolve corn starch in 1% sodium chloride aqueous solution, the mass ratio of sodium chloride aqueous solution to corn starch is 1.5:1, add KOH aqueous solution with a mass fraction of 13%, the mass ratio of KOH aqueous solution and corn starch is 1 :75, react with epichlorohydrin in a crosslinking reactor, the pH of the system is 10, the crosslinking temperature is controlled at about 20°C, the reaction time is 6 hours, and the mass ratio of epichlorohydrin to cornstarch is 1 :50.

[0098] After the cross-linking reaction is finished, the pH value is adjusted to 6-7 with 2% hydrochloric acid, the neutralized reaction solution is filtered and washed, and the waste water is discharged to a waste water pool.

[0099] After testing, the sedimentation volume of the obtained cross-linked starch was 40 mL.

[0100] (2) The cross-linked starch pregelatinization and graft copolymerization reaction adopts figure 1 The preparation setup shown carries out a continuous react...

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Abstract

The invention discloses a preparation method for crosslinking acrylamide grafted starch. The method comprises the steps that 1, starch and a crosslinking agent are subjected to a crosslinking reaction under the action of a catalyst, and crosslinking starch is prepared; 2, the crosslinking starch and water are pregelatinized after being mixed under a nitrogen condition, and gelatinized crosslinking starch is prepared; 3, the gelatinized crosslinking starch and acrylamide are subjected to a graft copolymerization reaction under the action of an initiator, and a crude grafted product is prepared; 4, after the crude grafted product is washed and separated with an extraction agent, extracting and refining are carried out with ethanediol-glacial acetic acid mixed liquor, and the fine grafted copolymer product obtained through drying is the crosslinking acrylamide grafted starch. Compared with the prior art, the crosslinking starch replaces natural starch to be subjected to graft copolymerization with acrylamide, the crosslinking acrylamide grafted starch is prepared, the viscosity of the system can be reflected, the crosslinking starch and acrylamide both do not adhere to walls, and the product is easy to discharge.

Description

technical field [0001] The invention belongs to the technical field of industrial sewage treatment, and in particular relates to a preparation method of a heavy metal trapping agent in industrial sewage treatment. Background technique [0002] The trapping of heavy metals, an important part of industrial wastewater treatment, depends largely on the performance of the trapping agent for its treatment effect. [0003] There are many methods for heavy metal wastewater treatment, among which the polymer heavy metal collector method can combine heavy metal ions in the range of room temperature and temperature and pH value to form stable and insoluble metal chelates, and the reaction efficiency is high. It has good performance, and when treating heavy metal wastewater, the sludge settles quickly and has a low water content. At the same time, it can separate some heavy metal ions from other ions and recycle them for reuse. It provides convenience for subsequent treatment, and it h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/56C08B31/12
CPCC08B31/12C08F251/00C08F220/56
Inventor 谭军冯群伟刘百山王全科韦晓燕欧阳玉霞胡亚雯吴泉龙金锦霞
Owner JIAXINGS AIERRUI ENVIRONMENTAL TECH CO LTD
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