Polyacrylamide-grafted chitosan comb-type copolymer sewage treating agent and RAFT (Reversible Addition-Fragmentation Chain Transfer) preparation method thereof

Inactive Publication Date: 2017-12-22
杨文思
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the flocculant described in this invention has adopted expensive chitosan in a large amount, and it is very easy to precipitate when the molecular weight is large and chelated, and has the disadvantages of high price and low utilization rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Polyacrylamide graft chitosan comb type copolymer sewage treatment agent of the present invention, RAFT preparation method is as follows:

[0025] (a) Preparation of multi-RAFT substituted chitosan: Dissolve 5.6 parts of dithioacetate chloride ethyl ester containing acid chloride groups in 14 parts of butyl acetate, and record it as solution a; 12 parts of chitosan, 2.1 Add 42 parts of triethanolamine to the reactor, add 42 parts of butyl acetate to dissolve evenly, then add solution a dropwise thereto, continue the reaction for 10 hours after the 1.5h dropwise addition, finish the reaction and cool to room temperature, and use 40 parts of methanol for the reaction solution After dissolving and diluting, add 36 parts of acetone for precipitation, and obtain a white solid by suction filtration, then repeat the process of methanol dissolution and dilution, precipitation with acetone, and suction filtration to obtain a white solid three times, that is, there are more shells...

Embodiment 2

[0028] Polyacrylamide graft chitosan comb type copolymer sewage treatment agent of the present invention, RAFT preparation method is as follows:

[0029] (a) Preparation of multi-RAFT-substituted chitosan: Dissolve 8 parts of 2-(ethyltrithiocarbonate)-2-methylpropionyl chloride containing acid chloride groups in 20 parts of THF, and record it as solution a ; Add 10 parts of chitosan and 3 parts of N-methylpyrrole into the reactor, add 30 parts of THF to dissolve evenly, then add solution a dropwise to it, continue to react for 6 hours after 2 hours of dropping, and cool down after the reaction After reaching room temperature, dissolve and dilute the reaction solution with 60 parts of methanol, add 30 parts of acetone for precipitation, and obtain a white solid by suction filtration, then repeat the process of methanol dissolution and dilution, precipitation with acetone, and suction filtration to obtain a white solid three times, that is, more dithio Ester or trithioester subs...

Embodiment 3

[0032] Polyacrylamide graft chitosan comb type copolymer sewage treatment agent of the present invention, RAFT preparation method is as follows:

[0033](a) Preparation of multi-RAFT substituted chitosan: Dissolve 6 parts of 2-(propyltrithiocarbonate)-2-methylpropionyl chloride containing acid chloride groups in 14 parts of DMSO, and record it as solution a ; Add 13 parts of chitosan and 1.2 parts of tri-n-butylphosphine into the reactor, add 45 parts of DMSO to dissolve evenly, then add solution a dropwise to it, continue to react for 8 hours after 1.5 hours of dropping, and the reaction ends Cool to room temperature, dissolve and dilute the reaction solution with 45 parts of methanol, add 35 parts of acetone for precipitation, and obtain a white solid by suction filtration, then repeat the process of methanol dissolution and dilution, precipitation with acetone, and suction filtration to obtain a white solid three times, that is, more disulfide Ester or trithioester substitu...

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Abstract

The invention relates to a polyacrylamide-grafted chitosan comb-type copolymer sewage treating agent and a RAFT (Reversible Addition-Fragmentation Chain Transfer) preparation method thereof. A preparation principle of the polyacrylamide-grafted chitosan comb-type copolymer sewage treating agent comprises the steps: firstly, performing nucleophilic substitution reaction on an amino group or a methylol group in chitosan and dithioester or trithioester of acyl chloride groups under an effect of a catalyst to prepare multi-RAFT-substituted chitosan; then performing aqueous solution polymerization on a monomer under effects of an initiating agent and the multi-RAFT-substituted chitosan to obtain a polyacrylamide-grafted chitosan comb-type copolymer. According to the sewage treating agent disclosed by the invention, the chitosan is used as a main chain, grafted polyacrylamide is used as a branch chain, the molecular weight is high, and a structure contains a large quantity of amino groups and organic ammonium ions which have a chelation effect; therefore, the polyacrylamide-grafted chitosan comb-type copolymer sewage treating agent has the advantages of stable performance, good flocculating efficiency, and high sedimentation velocity.

Description

technical field [0001] The invention relates to a sewage treatment agent, in particular to a polyacrylamide grafted chitosan comb copolymer sewage treatment agent and a RAFT preparation method thereof, belonging to the technical field of sewage treatment. Background technique [0002] my country is a country with serious shortage of water resources and serious waste of water resources. With the rapid urbanization process, the pollution of urban industrial wastewater and domestic wastewater is becoming more and more serious. It is particularly important to strengthen sewage treatment, especially industrial wastewater treatment. According to statistics, my country's annual discharge of industrial wastewater is about 8 × 10 8 m 3 , which not only contains highly toxic ingredients such as cyanide and chlorophenol, but also contains metal ions such as chromium, zinc and nickel. There are many ways to treat wastewater, mainly chemical precipitation, electrolysis and membrane tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F226/02C08F216/20C08F291/06C08F220/60C02F1/56
CPCC08F251/00C02F1/56C08F283/065C08F2438/03
Inventor 杨文思
Owner 杨文思
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