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Hemi-dry Synthesis of Cationic Lignin-based Flocculants and Its Application in Papermaking Wastewater Treatment
  
DOI：10.11981/j.issn.1000-6842.2019.04.27
Key Words:lignin; copolymerization; PMETAC; flocculant; papermaking wastewater
Fund Project:大连市青年科技之星项目（2017RQ036）；兴辽英才计划青年拔尖人才项目（XLYC1807232）；辽宁省自然科学基金重点项目（20170520300）资助。
Author NameAffiliation
CHEN Tengfei Liaoning Province Key Lab of Pulp and Paper Engineering， School of Light Industry and Chemical Engineering, Dalian Polytechnic University， Dalian， Liaoning Province， 116034 
GUO Yanzhu Liaoning Province Key Lab of Pulp and Paper Engineering， School of Light Industry and Chemical Engineering, Dalian Polytechnic University， Dalian， Liaoning Province， 116034 
CHU Tingting Liaoning Province Key Lab of Pulp and Paper Engineering， School of Light Industry and Chemical Engineering, Dalian Polytechnic University， Dalian， Liaoning Province， 116034 
LIU Guoxing Huisheng Group Plain Paper Co.， Ltd.， Dezhou， Shandong Province， 510640 
HAN Ying Liaoning Province Key Lab of Pulp and Paper Engineering， School of Light Industry and Chemical Engineering, Dalian Polytechnic University， Dalian， Liaoning Province， 116034 
LI Haiming Liaoning Province Key Lab of Pulp and Paper Engineering， School of Light Industry and Chemical Engineering, Dalian Polytechnic University， Dalian， Liaoning Province， 116034 
SUN Guangwei Liaoning Province Key Lab of Pulp and Paper Engineering， School of Light Industry and Chemical Engineering, Dalian Polytechnic University， Dalian， Liaoning Province， 116034 
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Abstract:
      The cationic lignin graft polymer （PHLM） was prepared by hemi dry synthesis through free radical polymerization using PHL （pre-hydrolyzed lignin） as raw material and METAC （［2-（methacryloyloxy） ethyl］ trimethylammonium chloride） as monomer， K2S2O8 as initiator. The structures and properties of PHLM were characterized by elemental analyzer， charge density analyzer， Fourier transform infrared spectroscopy （FT-IR） and nuclear magnetic resonance spectroscopy （1H-NMR） techniques. The reaction conditions were optimized based on the evaluation of the indexs of the solubility， graft ratio and charge density of PHLM. The optimal conditions were found that 60% reaction concentration， 2.0 molar ratio of METAC/PHL， 3.0% initiator dosage， pH value 4.0， 80℃， which generated the PHLM with 9.65 g/L solubility， 3.88 meq/g charge density and 214.93% graft ratio. The PHLM was used as flocculant in papermaking wastewater， the flocculation efficiency was the best when the dosage of PHLM was 25 mg/L and the pH value of wastewater was 5.0. The removal efficiency of CODCr and turbidity was up to 65.6% and 93.3%，respectively．
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