申请人:Maxbiogas GmbH
公开号:EP2835391A1
公开(公告)日:2015-02-11
The present invention primarily relates to a method for isolating lignin, preferably unmodified lignin, from a mixture, in particular a pulping slurry, containing lignin, a cellulose solvent, a cellulose precipitant, minerals and optionally (residual) cellulose and/or hemicellulose and/or hydrolysation products thereof, comprising or consisting of the following steps:
i) removing the cellulose precipitant from the mixture,
ii) contacting the mixture with a lignin precipitant, preferably at a temperature below 50 °C, to obtain a precipitate,
iii) removing the precipitate obtained in step ii) from the mixture,
iv) optionally washing the precipitate with a lignin precipitant,
v) removing the lignin precipitant from the precipitate,
vi) optionally separating the cellulose solvent and the lignin precipitant from the remaining mixture obtained in step iii)
with the proviso that in case the cellulose precipitant is the same as the lignin precipitant used in step ii) or contains one or more components of the mixture used as lignin precipitant in step ii), step i) is optional only.
本发明主要涉及一种从含有木质素、纤维素溶剂、纤维素沉淀剂、矿物质和可选(残留)纤维素和/或半纤维素和/或其水解产物的混合物(尤其是制浆浆)中分离木质素(最好是未改性木质素)的方法,该方法包括或包含以下步骤:
i) 从混合物中去除纤维素沉淀剂、
ii) 将混合物与木质素沉淀剂接触,最好温度低于 50 °C,以获得沉淀物、
从混合物中除去步骤 ii) 中得到的沉淀物、
选择性地用木质素沉淀剂洗涤沉淀物、
v) 从沉淀中去除木质素沉淀剂、
将纤维素溶剂和木质素沉淀剂从步骤 iii 中得到的剩余混合物中分离出来)
但如果纤维素沉淀剂与步骤ii)中使用的木质素沉淀剂相同,或含有步骤ii)中用作木质素沉淀剂的混合物中的一种或多种成分,则仅可选择步骤i)。