Influence of membrane filtration on extraction and characteristics of lignin from a kraft dissolving pulp mill pre-hydrolysate

摘要: Abstract During dissolving pulp production, the extraction of hemicellulose and other organics from hardwood chips prior to kraft pulping process can be performed using steam or hot water. The pre-hydrolysate this step is rich in sugars contains a considerable amount lignin. It estimated that lignin content stream as high 28 t d−1 for mill producing about 550 t d−1 pulp. In article, we report on recovery its characterization. use membrane filtration system has been experimentally validated an effective method concentrating extracting Three membranes with different molecular weight cut-offs (100, 10 1 kDa) have tested. subsequent step, sulfuric acid was added concentrated precipitate recovered characterized respect purity, distribution chemical properties. Approximately 99% retention both achieved 1 kDa membrane, 44.4% total being extracted by precipitation method. found low (2810 Da), homogeneity (Mw/Mn = 1.15), purity (91%). These characteristics make very attractive candidate niche applications.