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Preparation method of cationized cellulose-based flocculating agent

A cationization and cellulose technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of non-biodegradable, high production cost, and shortage of raw materials, so as to reduce production cost, reduce dependence on petroleum resources, improve access to branch rate effect

Inactive Publication Date: 2014-05-14
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the practical problems of traditional flocculants such as non-biodegradable, raw material shortage, low grafting rate, and high production cost, and at the same time recycle and efficiently utilize existing renewable biomass resources, to prepare high value-added and environmentally friendly natural organic polymers Flocculant, the purpose of the present invention is to provide a kind of preparation method of cationic cellulose-based flocculant

Method used

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  • Preparation method of cationized cellulose-based flocculating agent

Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] 1) Add moso bamboo cellulose to the mixed solution of sodium hydroxide and urea precooled at 3°C ​​for 25 min. The mass fractions of sodium hydroxide and urea are 6 wt% and 14 wt%, respectively. The mass ratio of cellulose was 15:1, stirred evenly, placed at -12°C and frozen for 100 min, taken out and placed in an ice bath and stirred to obtain a uniform and transparent cellulose solution;

[0018] 2) Under the action of magnetic stirring, the cellulose solution obtained in step 1) was blown with nitrogen for 30 minutes, and then added sodium periodate to oxidize for 120 minutes at 45°C (shading treatment during the entire oxidation process). The mass of oxidant and moso bamboo cellulose The ratio was 0.25:1, and polyacrylamide was added for graft polymerization. The mass ratio of polyacrylamide and moso bamboo cellulose was 1:1. During the reaction, an appropriate amount of distilled water was added and reacted for 90 minutes to obtain a uniform milky white solution (ce...

Embodiment 2

[0021] 1) The rice straw cellulose was added to the mixed solution of sodium hydroxide and urea precooled at 3°C ​​for 25 min. The mass fractions of sodium hydroxide and urea were 6 wt% and 14 wt%, respectively. The mass ratio of rice straw cellulose is 30:1, stirred evenly, placed at -12°C and frozen for 80 min, taken out and placed in an ice bath for stirring to obtain a uniform and transparent cellulose solution;

[0022] 2) Under the action of magnetic stirring, the cellulose solution obtained in step 1) was blown with nitrogen gas for 30 minutes, and then added sodium periodate to oxidize for 180 minutes at 75°C (shading treatment during the entire oxidation process). The oxidant and rice straw cellulose The mass ratio was 0.5:1, polyacrylamide was added for graft polymerization, the mass ratio of polyacrylamide to rice straw cellulose was 1.5:1, an appropriate amount of distilled water was added during the reaction, and the reaction was carried out for 120 min to obtain a...

Embodiment 3

[0025] 1) Add wheat straw cellulose to the mixed solution of sodium hydroxide and urea precooled at 3°C ​​for 25 min. The mass fractions of sodium hydroxide and urea were 6 wt% and 14 wt%, respectively. The mass ratio of straw cellulose was 50:1, stirred evenly, placed at -12°C and frozen for 60 min, taken out and placed in an ice bath for stirring to obtain a uniform and transparent cellulose solution;

[0026] 2) Under the action of magnetic stirring, the cellulose solution obtained in step 1) was fed with nitrogen gas for 30 min, and then added sodium periodate to oxidize for 240 min at 50°C (shading treatment during the entire oxidation process). The mass ratio was 1:1, and polyacrylamide was added for graft polymerization. The mass ratio of polyacrylamide to straw cellulose was 2:1. During the reaction, an appropriate amount of distilled water was added, and the reaction was carried out for 150 min to obtain a uniform milky white solution ( cellulose-based flocculants); ...

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Abstract

The invention discloses a preparation method of a cationized cellulose-based flocculating agent. The preparation method is characterized by comprising the steps: fully dissolving a cellulose material, adding an oxidizing agent, carrying out graft polymerization with polyacrylamide, and cationizing by using a Mannich reaction to prepare the cationized cellulose-based flocculating agent. The preparation method is simple, easy, rapid and efficient, and is especially suitable for preparation of a biodegradable cellulose-based flocculating agent. According to the preparation method, the cellulose material is introduced in the preparation raw material to be used as a molecule basic skeleton to partially replace a synthetic high polymer material, thus the dependency of a conventional synthetic high polymer flocculating agent to petroleum resources is reduced, the biodegradability of the flocculating agent is improved, the grafting ratio of polyacrylamide is increased by using an oxidized grafting reaction; meanwhile, Mannich cationization is performed, and the prepared cationized cellulose-based flocculating agent is suitable for treatment processes such as papermaking, printing and dyeing, municipal wastewater and the like, and has important environment and social benefits.

Description

technical field [0001] The invention relates to a preparation method of a cellulose-based flocculant, in particular to a preparation method of a cationic cellulose-based flocculant, and belongs to the technical field of water treatment engineering. Background technique [0002] In various wastewater treatment processes, flocculation and sedimentation play an increasingly important role due to its economical and efficient characteristics, especially in the removal of particulate matter, dyes, and heavy metals. The flocculation process is a process in which dispersed particles are aggregated to form flocculent substances, then precipitated, and finally removed from wastewater. [0003] Flocculants are mainly divided into two categories: inorganic and organic flocculants. Although inorganic flocculants are cheap, their rapid development is restricted by their small range of use, large amount of feed, unsatisfactory flocculation effect, and some of them are corrosive. Although ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08B15/02C02F1/56
Inventor 姚菊明朱杭城刘虹奕张勇
Owner ZHEJIANG SCI-TECH UNIV
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