Parameters Affecting the Cross-Flow Filtration of Dissolved LignoBoost Kraft Lignin. (2nd January 2016)

• Record Type: Journal Article
• Authors: Helander, Mikaela; Mattsson, Tuve; Theliander, Hans; Lindström, Mikael E.
• Is Part Of: Journal of wood chemistry and technology. Volume 36:Number 1(2016)
• Page Start: 1
• Page End: 8
• Publication Date: 2016-01-02
• Subjects: Cross-flow filtration -- ultrafiltration -- kraft lignin -- low molecular weight; Wood -- Chemistry -- Periodicals; Wood; Wood -- Chemistry; Periodicals; 674.13
• DOI: 10.1080/02773813.2015.1025284
• Languages: English
• ISSNs: 0277-3813

Abstract

Abstract : In the kraft pulping process, the lignin-containing by-product kraft black liquor is currently combusted as an energy source. LignoBoost is a technique that extracts lignin from kraft black liquor, resulting in a lignin-lean black liquor, which is returned to the process, and an extracted kraft lignin. To facilitate the use of the extracted kraft lignin in high-value applications, it can be refined via fractionation to produce a more homogeneous starting raw material. Hence, the aim of this study is to investigate the behavior of dissolved softwood kraft lignin during cross-flow filtration. The effects of the lignin concentration, pH, and ionic strength on the fractionation of the dissolved lignin during cross-flow filtration are investigated. The results indicate that large amounts of low-molecular-weight kraft lignin can be produced from solutions having a low lignin concentration. Furthermore, the effects of pH and ionic strength on the fractionation of low-molecular-weight lignin are identified within the studied ranges.