Effect of pH on Kraft Lignin Depolymerisation in Subcritical Water

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

Softwood kraft lignin was depolymerized using subcritical water (623 K and 25 MPa) in a continuous small pilot unit. ZrO2 and K2CO3 were used as catalysts, and phenol was used as capping agent to suppress repolymerization. The effect of pH was investigated by adding KOH in five steps to the feed. The yield of water-soluble organics increased with pH. The yield of bio-oil was also influenced by the pH and varied between 28 and 32 wt %. The char yield on the zirconia catalyst showed a minimum at pH 8.1. The yield of suspended solids was low at pH below 8.1 but increased at higher pH values. The oxygen content in the bio-oil was only 15 wt %, compared to about 26 wt % in the kraft lignin.

Mattsson, Cecilia,1970Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)cecmat (author)
Andersson, Sven-Ingvar,1943Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)sianders (author)
Olausson, L.Valmet Oyj (author)
Åmand, Lars-Erik,1957Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)leam (author)
Theliander, Hans,1956Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)hanst (author)
Vamling, Lennart,1954Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lennartv (author)
Chalmers tekniska högskolaValmet Oyj (creator_code:org_t)

In:Energy & Fuels: American Chemical Society (ACS)30:6, s. 4916-49241520-50290887-0624

By the author/editor: Belkheiri, Talla ...; Mattsson, Cecili ...; Andersson, Sven- ...; Olausson, L.; Åmand, Lars-Erik ...; Theliander, Hans ...; show more...; Vamling, Lennart ...; show less...

About the subject

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.