An eco-friendly and efficient route of lignin extraction from black liquor and a lignin-based copolyester synthesis

Autor: Dongouk Kim, Le Dai Duong, Seong Hoon Lee, Nguyen Dang Luong, Nguyen Thi Thanh Binh, Jae-Do Nam, Baek Jin Kim, Dae-Sik Kim, Yong Sang Lee
Rok vydání: 2011
Předmět:
Zdroj: Polymer Bulletin. 68:879-890
ISSN: 1436-2449
0170-0839
DOI: 10.1007/s00289-011-0658-x
Popis: Traditional method for extraction of lignin from black liquor in chemical pulping processes requires a huge amount of toxic inorganic acids like sulfuric acid which are potentially harmful to our environment and life. Furthermore, the traditional method always contains multiple steps, and thus it is time-consuming process. With a purpose to eliminate all these above disadvantages, in this study, we successfully developed an efficient process for the extraction of lignin from black liquor using a non-toxic aluminum potassium sulfate dodecahydrate (AlK(SO4)2·12H2O). The developed process is simple, efficient, and short-time, which obviously have more advantages over the traditional extraction method. Furthermore, the lignin extracted in this study was used to synthesize a copolyester through polyesterification between lignin and sebacoyl chloride. The copolymer possesses a molecular weight of 31,800, corresponding to four to five repeating units of lignin macromonomers. Notably, it showed a good thermal stability up to 200 °C in TGA analysis. It was also possible to shape the copolymer using solvent casting. We believe that this newly developed method of lignin extraction may exploit new applications for eco-friendly sustainable materials in various fields.
Databáze: OpenAIRE
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