发明名称 |
METHOD FOR LIGNIN SEPARATION FROM BLACK LIQUOR COMPRISING MULTIPLE ACIDIFICATION STEPS |
摘要 |
<p>The present invention relates to a method for separation of lignin from original black liquor (BLIN) comprising the following phases in sequence; a first precipitation phase (PR1) for precipitation of lignin by a first acidification of the original black liquor by adding a first acid or mixture of acids (G1a); followed by a second precipitation phase (PR2) for precipitation of lignin by a further acidification of the original black liquor by adding a second acid or mixture of acids (G1b). According to the invention is the first phase implemented to lower the pH while avoiding any larger amount of precipitation, i.e. less than 2-5%, while the second phase is implemented in order to obtain the larger part of the precipitation. In total is 40-70% of the total lignin content of the original black liquor precipitated while the residual black liquor after precipitation is still strongly alkaline.</p> |
申请公布号 |
CA2839864(A1) |
申请公布日期 |
2012.12.27 |
申请号 |
CA20112839864 |
申请日期 |
2011.06.22 |
申请人 |
METSO POWER AB |
发明人 |
BJORKLUND, PETER;WIBY, MARTIN;WALLMO, HENRIK |
分类号 |
D21C11/00;C07G1/00;C08H8/00 |
主分类号 |
D21C11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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