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

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T1 - Separation of lignin in kraft cooking liquor from a continuous digester by ultrafiltration at temperatures above 100 degrees C

AU - Wallberg, Ola

AU - Jönsson, Ann-Sofi

PY - 2006

Y1 - 2006

N2 - 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.

AB - 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.

KW - high

KW - temperature

KW - ceramic membranes

KW - ultrafiltration

KW - Kraft cooking liquor

KW - lignin

U2 - 10.1016/j.desal.2005.11.011

DO - 10.1016/j.desal.2005.11.011

M3 - Article

VL - 195

SP - 187

EP - 200

JO - Desalination

JF - Desalination

SN - 1873-4464

IS - 1-3

ER -