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Synthesis of Super-High Molecular Weight Polyacrylamides and their Flocculation Properties

Yan Lin Sun, Hui Xiang Du, Hong Wang, Yun Hua Huang

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Abstract

The super-high molecular weight polyacrylamide flocculants were synthesized using potassium persulfate/sodium hydrogen sulfite as initiators via free radical solution polymerization. The effects of monomer concentration and initiator dosage on the molecular weight, insoluble fraction and dissolution rate of PAM were investigated. The flocculation properties of PAMs prepared was examined by flocculating kaolin suspensions. The results show that the PAM products synthesized at the monomer concentration 30% and the initiator dosage 0.5‰ can meet the requirements. The molecular weight of this kind of PAM can reach 5.84×106, insoluble fraction can decrease to 0, and the dissolution can be completed in 10 minutes. Using this kind of PAM as flocculants (1.45mg PAM/100g kaolin suspension), the clear water transmittance can be up to 99% at pH 3.5~4.0.

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What this paper is about

The super-high molecular weight polyacrylamide flocculants were synthesized using potassium persulfate/sodium hydrogen sulfite as initiators via free radical solution polymerization. The effects of monomer concentration and initiator dosage on the molecular weight, insoluble fraction and dissolution rate of PAM were investigated. The flocculation properties of PAMs prepared was examined by flocculating kaolin suspensions. The results show that the PAM products synthesized at the monomer concentration 30% and the initiator dosage 0.5‰ can meet the requirements. The molecular weight of this kind of PAM can reach 5.84×106, insoluble fraction can decrease to 0, and the dissolution can be completed in 10 minutes. Using this kind of PAM as flocculants (1.45mg PAM/100g kaolin suspension), the clear water transmittance can be up to 99% at pH 3.5~4.0.

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Available abstract

The super-high molecular weight polyacrylamide flocculants were synthesized using potassium persulfate/sodium hydrogen sulfite as initiators via free radical solution polymerization. The effects of monomer concentration and initiator dosage on the molecular weight, insoluble fraction and dissolution rate of PAM were investigated. The flocculation properties of PAMs prepared was examined by flocculating kaolin suspensions. The results show that the PAM products synthesized at the monomer concentration 30% and the initiator dosage 0.5‰ can meet the requirements. The molecular weight of this kind of PAM can reach 5.84×106, insoluble fraction can decrease to 0, and the dissolution can be completed in 10 minutes. Using this kind of PAM as flocculants (1.45mg PAM/100g kaolin suspension), the clear water transmittance can be up to 99% at pH 3.5~4.0.

Key concepts: Polyacrylamide, Flocculation, Monomer, Potassium persulfate, Dissolution, Chemistry, Sodium sulfite, Polymerization

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