Kraft Lignin Depolymerization in Near-Critical Water: Effect of Changing Co-Solvent

Belkheiri, Tallal,1985Chalmers tekniska högskola,Chalmers University of Technology (författare)

As part of developing a process to valorize lignin in a pulp mill with lignin separation, the depolymerisation of lignin to valuable chemicals was investigated in near-critical water. This was done by using methanol as co-solvent and hydrogen donor, phenol to suppress repolymerization (e.g. formation of char), and ZrO2 as a heterogeneous catalyst, with potassium carbonate as a co-catalyst. The reaction was carried out in a continuous flow fixed-bed reactor (500 cm(3)), at 280-350 degrees C and 25MPa. An important aspect is to suppress char formation. Therefore, the char formation was studied by using different concentrations of methanol and phenol. The char yield varied between 14% and 26%. When using methanol as the only co-solvent, the char yield decreased with increasing methanol concentration. Adding phenol resulted in a further decrease. The reactor outlet consisted mainly of two liquid phases, an aqueous and an oil phase, mixed together. The chemical analysis of the aqueous phase showed the presence of mainly phenolic compounds, for instance guaiacol, catechol, phenol and cresol.

Vamling, Lennart,1954Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lennartv (författare)
Nguyen Lyckeskog, Huyen,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)huyen (författare)
Maschietti, Marco,1974Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)marcom (författare)
Olausson, L.Valmet Oyj (författare)
Andersson, Sven-Ingvar,1943Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)sianders (författare)
Åmand, Lars-Erik,1957Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)leam (författare)
Theliander, Hans,1956Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)hanst (författare)
Chalmers tekniska högskolaValmet Oyj (creator_code:org_t)

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