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Method for producing flocculant, flocculant produced by the same method and application

A flocculant and crude product technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve the effect of high-efficiency reaction, large wastewater treatment capacity, and no post-treatment steps

Inactive Publication Date: 2010-12-22
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention has announced the use of grinding mechanochemical method to improve the physical and chemical properties of raw starch (Chen Ling et al., the method of using grinding mechanochemical method to modify starch, Chinese patent: CN1273491C, 2006), dry mechanochemical ultrafine Modified calcium carbonate (Yang Mei, etc., the method of dry mechanochemical ultrafine modified calcium carbonate, Chinese patent: CN 1803937A, 2006), the method for preparing high-purity mullite at low temperature by mechanochemical method (Luo Juhua , a method for preparing high-purity mullite at low temperature by mechanochemical method, Chinese patent: CN 1699271A, 2005), low-temperature mechanochemical cross-linking modified phenolic resin (Lei Shaomin, an asynchronous low-temperature mechanochemical cross-linking modified The preparation method of permanent phenolic resin, Chinese patent: CN 1908027A, 2007), shows that the chemical effect of solid matter under the action of mechanical force stimulates the modification and makes the characteristics of the material change, but about the use of mechanochemical action to induce starch Material carries out etherification reaction, prepares quaternary ammonium cationic modified starch as the application of flocculant in water treatment and has not been reported yet.

Method used

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  • Method for producing flocculant, flocculant produced by the same method and application
  • Method for producing flocculant, flocculant produced by the same method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Preparation of quaternary ammonium cationic modified starch

[0027] Experimental material: commercial cornstarch, purchased from Tianjin Dingfeng Starch Co., Ltd., or self-made cornstarch (see: Guo Lei, Zhang Zhengmao, Hu Lili, Fu Guodong, Zhao Siming, Research on Grinding Kinetics of Water-soluble Rice Starch, Agricultural Engineering Acta Sinica, 2007, 23(1): 202-206), etherification agent: 2,3-epoxypropyltrimethylammonium chloride, purchased from Shandong Dongying Chemical Co., Ltd., ethanol is a commercially available product.

[0028] Concrete preparation steps are as follows:

[0029] (1) Get 32.5g (dry basis) of cornstarch in an agate ball mill jar, add 12.1g of 2,3-epoxypropyltrimethylammonium chloride, and mix;

[0030] (2) Take by weighing agate grinding balls (wherein the ball 75g of diameter 1cm, the ball 25g of diameter 0.6cm) 100g, put into ball mill jar;

[0031] (3) Put the ball mill jar into the puller sleeve of the ball mill, cover it,...

Embodiment 2

[0040] Embodiment 2: the application of the method of the present invention to the starch modification of different sources

[0041] With glutinous rice, Sanjiang rice (japonica rice), Yuhong rice (indica rice), common corn, waxy corn, sweet potato, potato, plantain taro and cassava as materials, the modified starch of the present invention is prepared according to the preparation method of Example 1. The degree of substitution, yield and reaction efficiency are shown in Table 2.

[0042] Table 2 Degree of substitution, yield and reaction efficiency of cationic starch from different sources (mean ± standard deviation)

[0043] starch source

[0044] It can be known from Table 2 that the degrees of substitution of the quaternary ammonium cationic modified starches prepared according to the present invention are all greater than 0.3, and the reaction efficiency is above 75%.

Embodiment 3

[0045] Example 3: Application of cationic modified starch prepared by the present invention as flocculant in water treatment

[0046] In this example, the applicant applied the quaternary ammonium cationic cornstarch prepared by the present invention as a flocculant for water treatment, compared with traditional inorganic flocculants, the results are shown in Figure 4-6 and shown in Table 3. Figure 4 It is the comparison of the flocculation effect of alum and polyaluminium chloride when the modified starch prepared by the present invention treats kaolin suspension (mass concentration is 1%), wherein the quaternary ammonium type cationic modified starch prepared by the present invention, alum and polychloride The optimum dosage of aluminum chloride is 6mg / L, 833mg / L and 1000mg / L respectively. Figure 5 It is the relationship between the pH of the water body and the flocculation effect when the modified starch of the present invention treats the kaolin suspension. Figure 6 ...

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Abstract

The invention relates to a mechanical and chemical double modification method for producing quaternary ammonium cation modified starch, belonging to flocculant preparation technical field and starch modification technical field, while the quaternary ammonium cation modified starch can be used as flocculant for water treatment and waste water purification. The invention is characterized in that modifying starch and etherifying agent 2, 3-epoxypropyl trimethylammonium chloride, via mechanical force activation into quaternary ammonium cation starch, wherein the 2, 3-epoxypropyl trimethylammoniumchloride and starch at the mol ratio of 0.2-0.7:1 are mixed uniformly, the agate abrading-ball of 1cm-0.6cm diameter and weight ratio of 1-5:1 is used as medium, the weight ratio of abrading-ball andmaterial in a ball grinding tank is set as 1-5:1 to be grinded for 0.2-10h at 100-800r / min, the grinded materials are taken off to be arranged at 40-95 DEG C to be mixed and reacted for 0-5h to obtain modified starch crude product to be washed and purified by alcohol water solution to obtain quaternary ammonium cation modified starch. Compared with the prior art, the invention has simple process,non generation of three wastes and environment-friendly property.

Description

technical field [0001] The invention belongs to the technical field of flocculant preparation and starch modification technology, and relates to a method for producing quaternary ammonium cationic modified starch under alkali-free and dry preparation conditions through mechanical force and chemical modification. The quaternary ammonium cationic modified starch is used as a flocculant, which can be used in water treatment, especially in wastewater purification. Background technique [0002] my country's starch resources are extremely rich and cheap. Starch is a natural polymer substance. Because of its wide molecular weight distribution, many active groups, and structural diversification, it is often used for cationic modification to prepare cationic starch. The modified Starch molecules have positive cationic charges and have affinity for most negatively charged fibers and colloidal particles. They are widely used in papermaking, mining, textil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/12C08K5/19C02F1/56
Inventor 赵思明许永亮熊善柏荣建华谭汝成
Owner HUAZHONG AGRI UNIV