Separation of lignin in kraft cooking liquor from a continuous digester by ultrafiltration at temperatures above 100 degrees C

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Bibtex

@article{61d83340e671431d9f3fbd3f43595bd0,
title = "Separation of lignin in kraft cooking liquor from a continuous digester by ultrafiltration at temperatures above 100 degrees C",
abstract = "Lignin was extracted by ultrafiltration from kraft cooking liquors taken directly from a continuous digester. The temperature of the liquors was 145 degrees C (softwood) or 135 degrees C (hardwood), the total dry solids content was 18{\%} and the pH 13-14. Methods for start-up, shut-down and cleaning of conventional UF equipment modified for this demanding application, were developed. The influence of transmembrane pressure, cross-flow velocity and temperature on the performance of two ceramic membranes with cut-offs of 5,000 and 15,000 Da was studied. The flux of softwood liquor at 145 degrees C and a TMP of 400 kPa was 100 l/m(2) h for the membrane with the 15,000 Da cutoff and 50 l/m(2) h for the membrane with the 5,000 Da cut-off. The retention of lignin was 20{\%} and 30{\%} for the 15,000 Da and 5,000 Da membranes, respectively.",
keywords = "high, temperature, ceramic membranes, ultrafiltration, Kraft cooking liquor, lignin",
author = "Ola Wallberg and Ann-Sofi J{\"o}nsson",
year = "2006",
doi = "10.1016/j.desal.2005.11.011",
language = "English",
volume = "195",
pages = "187--200",
journal = "Desalination",
issn = "1873-4464",
publisher = "Elsevier",
number = "1-3",

}