LIGNOSULFONATE OF A CERTAIN QUALITY AND METHOD OF PREPARATION OF LIGNOSULFONATE OF A CERTAIN QUALITY,申请号ZA20120003619-传众专利搜索

LIGNOSULFONATE OF A CERTAIN QUALITY AND METHOD OF PREPARATION OF LIGNOSULFONATE OF A CERTAIN QUALITY

申请公布号：ZA201203619(B)

申请号：ZA20120003619

申请日期：2012.05.17

申请公布日期：2013.08.28

申请人：

DOMSJO FABRIKER AB

发明人：JOENSSON BENGT;GRUNDBERG HANS;GUSTAFSSON ALF

分类号：C07G

主分类号：C07G

摘要：There is provided a process for improving the quality of lignosulfonate at least partly derived form a spent sulfite cooking liquor in at least two steps, comprising: one step in which a lignosulfonate-containing fraction at least partly derived from the spent sulfite cooking liquor is subjected to filtration using a membrane having a cut-off of 40-150 kD (high cut-off) at the pressure, flow rate and temperature of the step and the permeate is recovered; and another step in which a lignosulfonate-containing fraction at least partly derived from the spent sulfite cooking liquor is subjected to filtration using a membrane having a cut-off of 1-20 kD (low cut-off) at the pressure, flow rate and temperature of the step and the retentate is recovered. Products, uses thereof as well as a system are also provided.