Method for preparing water-soluble cationic lignin-based flocculant by semi-dry method

A water-soluble cation and flocculant technology, which is applied in the field of material science, can solve the problems of large dosage, small dosage, and large flocs, and achieve the effects of less water consumption, simplified preparation conditions, and strong positive charge
CN109970930AInactive Publication Date: 2019-07-05DALIAN POLYTECHNIC UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN POLYTECHNIC UNIVERSITY
Publication Date
2019-07-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing a water-soluble cationic lignin-based flocculant by a semi-dry method, and belongs to the technical field of material science. The method comprises thefollowing steps: adding lignin into deionized water at room temperature, mixing with grafting monomer METAC solution, adjusting pH to 2-5 to obtain reaction solution; adding potassium persulfate intothe reaction solution under nitrogen atmosphere, and performing water bath reaction to obtain lignin-METAC grafting copolymer crude product; washing and dialyzing the obtained lignin-METAC grafting copolymer crude product to obtain the purified lignin-METAC grafting copolymer. The product obtained by the method is subjected to flocculation treatment on papermaking wastewater and emulsified oil-containing wastewater after being purified, so that a better treatment effect is obtained; meanwhile, the method is simple in process, less in water consumption, good in water solubility and cationicity,thereby achieving industrial production easily, and being a new way for high-value utilization of the lignin.
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Description

technical field

[0001] The invention relates to a semi-dry method for preparing a water-soluble cationic lignin-based flocculant, which belongs to the technical field of material science. Background technique

[0002] my country is a country that lacks water resources. With the rapid development of the industrial level in recent years, the water consumption has also increased sharply. In order to avoid the harm of industrial production wastewater to the environment, the problem of wastewater treatment is becoming more and more serious. As a simple, economical and widely used water treatment method, flocculation treatment has received extensive attention. The principle of flocculant is to form a certain volume of flocs through the contact between suspended particles and colloids that are not easy to settle in wastewater, and through charge neutralization and adsorption bridging. Then, the flocs are removed by physical methods such as sedimentation and air flotation, so as t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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