Co-processing of wood and wheat straw derived pyrolysis oils with FCC feed-Product distribution and effect of deoxygenation

FUEL

卷:260

Article

Eschenbacher, Andreas¹  Myrstad, Trond²  Bech, Niels³  Duus, Jens Ollgaard⁴  Li, Chengxin⁴  Jensen, Peter Arendt¹  Henriksen, Ulrik Birk¹  Ahrenfeldt, Jesper¹  Mentzel, Uffe Vie⁵  Jensen, Anker Degn¹ 

[1] Tech Univ Denmark, Dept Chem & Biochem Engn, Soltofts Plads Bldg 229, DK-2800 Lyngby, Denmark

[2] Equinor, Forskningsenter Rotvoll, Arkitekt Ebbels Vei 10, N-7053 Ranheim, Norway

[3] Equinor Danmark AS, Melbyvej 10, DK-4400 Kalundborg, Denmark

[4] Tech Univ Denmark, Dept Chem, Kemitorvet Bldg 207, DK-2800 Lyngby, Denmark

[5] Haldor Topsoe Res Labs, Haldor Topsoes Alle 1, DK-2800 Lyngby, Denmark

关键词: FCC;    Co-processing;    Deoxygenation;    Straw;    Pyrolysis oil;    HZSM-5;   

DOI  :  10.1016/j.fuel.2019.116312

来源: Elsevier

【 摘 要 】

The behavior of bio-oils when co-processed with conventional fossil feed in a fluid catalytic cracking (FCC) unit is suitably tested using a microactivity testing unit (MAT). In the present study, non-catalytic fast pyrolysis oils originating from wood and wheat straw were co-processed in a MAT at a 20/80 weight blend (bio-oil/FCC feed). In addition, bio-oil obtained from deoxygenating the straw derived vapors over a steamed HZSM-5/Al2O3 extrudate catalyst was tested. The bio-oils were characterized for elemental composition and moisture content to calculate energy recoveries, amounting to 35% and 30% for the non-catalytically obtained wood and straw oils, while it was 19% for the partly deoxygenated straw oil. Wood oil showed higher acidity (61 mg KOH/g) and molar O/C ratio (0.35) compared to straw oil (54 mg KOH/g and O/C = 0.24). The acidity and O/C ratio was reduced for the straw-derived bio-oil from catalytic vapor treatment (3 mg KOH/g, O/C = 0.08). At constant conversion (77.5%) at the MAT, the wood pyrolysis oil showed a product distribution quite similar to the reference oil while the wheat straw pyrolysis oil gave a 1.6% points higher coke yield and a 1.2% points lower liquid petroleum gas (LPG) yield. For the catalytically treated wheat straw pyrolysis oil, an even higher coke yield (2.6% points) and 1.9% points lower LPG yield resulted. The observations are attributed to the higher content of aromatics, phenolics, and nitrogen containing compounds of the catalytically upgraded straw fast pyrolysis oil.

【 授权许可】

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