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Modified starch/polyamine compound, preparation method of modified starch/polyamine compound and application of modified starch/polyamine compound to stone processing waste water turbidity reduction

A compound and starch technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of product structure and branching degree that are not easy to control, not suitable for large-scale use, low molecular weight, etc., so as to improve the flocculation treatment capacity. , good removal effect, less dosage effect

Inactive Publication Date: 2019-06-14
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relative molecular weight of most of the products is relatively low and the distribution is wide, and the structure and branching degree of the product are not easy to control, and the intramolecular cyclization is relatively serious.
At the same time, it is expensive and not suitable for large-scale use

Method used

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  • Modified starch/polyamine compound, preparation method of modified starch/polyamine compound and application of modified starch/polyamine compound to stone processing waste water turbidity reduction
  • Modified starch/polyamine compound, preparation method of modified starch/polyamine compound and application of modified starch/polyamine compound to stone processing waste water turbidity reduction
  • Modified starch/polyamine compound, preparation method of modified starch/polyamine compound and application of modified starch/polyamine compound to stone processing waste water turbidity reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 Preparation of modified starch / polyamine compound

[0028] 1. Starch solid pretreatment:

[0029] The oven temperature was set at 200° C., and the starch solids were dried in the oven for 20 minutes.

[0030] 2. Hyperbranched polyamidoamine pretreatment:

[0031] The oven temperature was set to 200° C., and the hyperbranched polyamidoamine solid was dried in the oven for 15 minutes.

[0032] 3. Preparation of starch / polyamine compound:

[0033] 1) Put 10 g of dried starch solids into a beaker, add 15 mL of distilled water, and stir until completely dissolved to obtain a starch solution;

[0034] 2) Adjust the pH value of the starch solution to 7 with 0.5mol / L sodium hydroxide solution, and gelatinize at 95°C for 30min;

[0035] 3) Add 20 g of oxidant sodium hypochlorite to the product obtained in step 2) to oxidize for 50 min;

[0036] 4) Under the condition of a stirring speed of 100 r / min, 10 g of hyperbranched polyamidoamine was added, and the modif...

Embodiment 2

[0037] Example 2 Determination of the optimum conditions of the modified starch / polyamine compound during use

[0038] 1. Determine the ratio of starch and hyperbranched polyamidoamine

[0039] Dry starch solids and hyperbranched polyamidoamine solids respectively, according to the mass ratio, 1:0.5, 1:1, 1:1.5, 1:2, respectively take 4 parts of starch solids and 4 parts of hyperbranched polyamidoamine solids , the preparation method is the same as in Example 1, and a modified starch / polyamine compound is made.

[0040] Take 4 parts of 500mL stone processing wastewater and pour them into beakers respectively, add 4mg of the modified starch / polyamine compound prepared above, stir at 100r / min for 15min, flocculate and settle at room temperature for 2h, measure the turbidity of stone wastewater after treatment. Spend.

[0041] The result is as figure 1 As shown, as the mass ratio of starch to hyperbranched polyamidoamine increases, the turbidity first decreases and then increa...

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Abstract

The invention relates to a modified starch / polyamine compound, a preparation method of the modified starch / polyamine compound and application of the modified starch / polyamine compound to stone processing waste water turbidity reduction, and belongs to the technical field of a flocculating agent and waste water treatment. The preparation method of the modified starch / polyamine compound comprises the following steps of (1) starch solution preparation: mixing starch and water to obtain a starch solution; (2) pasting: regulating the pH of the mixture by a sodium hydroxide solution; then performingpasting; (3) oxidization: adding oxidizing agents sodium hypochlorite into the products obtained in step (2) for oxidization; (4) adding hyperbranched polyamidoamine into a product obtained in step (3); performing stirring to obtain a target product. The modified starch / polyamine compound has the characteristics of novelty, high efficiency, no toxicity, economic performance and the like; the consumption of the stone processing waste water is low; the settling speed is high; the stone processing waste water turbidity can be obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of flocculants and wastewater treatment, and in particular relates to a modified starch / polyamine compound and its preparation method and its application in reducing the turbidity of stone processing wastewater. Background technique [0002] Starch is a natural polymer with a wide range of sources. High-efficiency and low-cost polymer flocculants can be prepared through chemical modification such as oxidation, grafting, etherification, esterification, and cross-linking. Starch is gelatinized with certain cationic polymers, and the resulting paste has properties similar to cationic starch. The method has the characteristics of reducing cost, reducing pollution caused by producing cationic starch, simplifying production operation and the like. However, as a polymer flocculant, starch has poor stability in stone processing wastewater, which will lead to higher dosage and smaller flocs, which cannot effectively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 包红旭宋泽斌吕志忠李良玉张欣苏弘治杨雨萌张馨月吴洁婷金楠珣
Owner LIAONING UNIVERSITY
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