Separation of chemically degraded lignosulfonates and desired products with ceramic membranes

S. Schönherr*, M. Ebrahimi, A.M. Steger, University of Applied Sciences Mittelhessen; P. Geigle, CMBlu Projekt AG; S. Demharter, Sappi Europe; S.Schütz, F. Ehlen, MANN+HUMMEL GMBH, Germany; Peter Czermak, Kansas State University, USA

The ongoing discussion about a necessary reduction of CO2-emissions and depleted reservoirs of crude oil worldwide lead to an increasing interest in sustainable, renewable and alternative sources for aromatic molecules. In this context, lignin-containing process streams are in focus of several research programs as lignin is the most abundant renewable source of aromatic molecules on earth. From a chemical point of view lignin is a highly cross-linked, heterogeneous copolymer consisting of three different 4-hydroxyphenyl-propanoid monomer units: para-coumaryl alcohol, coniferyl alcohol and sinapyl alcohol. Despite its chemical potential as a source for high value aromatic products, lignin is still underutilized. The pulp and paper industry e.g. produces ca. 50 million tons of lignin per year as kraft lignin, lignosulfonates and organosolv lignin, but only 2% are used for production of industrial products, the rest is incinerated for internal energy supply. The underutilization of lignin is related to its strong recalcitrance towards degradation and the problem of numerous degradation products and their purification. In the present study, a membrane based separation process for chemically degraded lignosulfonates is investigated. ...

Session: M5 - Ceramic Membrane Applications
Day: 15 March 2018
Time: 09:00 - 10:15 h

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