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| Preparation of Cationic Surfactant Derived from Alkali Lignin by Microwave Digestion Pretreatment |
| Received:September 27, 2021 |
| DOI：10.11981/j.issn.1000-6842.2022.03.45 |
| Key Words:alkali lignin;surfactant;quaternization;microwave digestion |
| Fund Project:制浆造纸科学与技术教育部重点实验室开放基金（KF201920）；催化基础国家重点实验室（中国科学院大连化物所）开放课题（N-20-03）。 |
| Author Name | Affiliation | Postcode | | TANG Xiaohui* | Key Lab of Biomass and Chemistry of Liaoning Province， School of Light Industry & Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 | 116034 | | PING Qingwei | Key Lab of Biomass and Chemistry of Liaoning Province， School of Light Industry & Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 | 116034 | | SHENG Xueru | Key Lab of Biomass and Chemistry of Liaoning Province， School of Light Industry & Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 | 116034 |
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| Abstract: |
| Lignin-based cationic surfactant derived from alkali lignin （AL） was prepared by microwave digestion pretreatment， accompanied by quaternization in this study. Effects of H2O2 dosage， microwave power， and microwave duration on performance of the obtained product were studied. Potentiometric titration， FT-IR， UV-vis， optical contact angle measuring were used to characterize AL and its quaternization product （ALG）， microwave pretreated lignin （ALM） and its quaternization product （i.e.， lignin-based cationic surfactant， ALMG）. The results show that the optimal conditions of microwave digestion are H2O2 dosage of 8.4 wt%， microwave duration 7 min， and microwave power 140 W. It is found that the hydroxyl content of ALM increased significantly from 1.29 mmol/g（AL） to 2.39 mmol/g after microwave digestion. The surface tension of quaternized ALMG solution （36 mN/m） was lower than that of its ALG counterpart （47 mN/m） at the same mass concentration of 0.1 g/L. Moreover， the critical micelle concentration of ALMG is 0.6 g/L， rendering it a promising candidate of wetting agent. |
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