R
Richard T. Hallen
Researcher at Pacific Northwest National Laboratory
Publications - 68
Citations - 2903
Richard T. Hallen is an academic researcher from Pacific Northwest National Laboratory. The author has contributed to research in topics: Hydrothermal liquefaction & Catalysis. The author has an hindex of 25, co-authored 66 publications receiving 2479 citations. Previous affiliations of Richard T. Hallen include Battelle Memorial Institute & Environmental Molecular Sciences Laboratory.
Papers
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Journal ArticleDOI
Process development for hydrothermal liquefaction of algae feedstocks in a continuous-flow reactor
Douglas C. Elliott,Todd R. Hart,Andrew J. Schmidt,Gary G. Neuenschwander,Leslie J. Rotness,Mariefel V. Olarte,Alan H. Zacher,Karl O. Albrecht,Richard T. Hallen,Johnathan E. Holladay +9 more
TL;DR: In this article, high levels of carbon conversion to gravity separable biocrude product were accomplished at relatively low temperature (350°C) in a continuous-flow, pressurized (sub-critical liquid water) environment.
ReportDOI
Process Design and Economics for the Conversion of Algal Biomass to Hydrocarbons: Whole Algae Hydrothermal Liquefaction and Upgrading
Susanne B. Jones,Yunhua Zhu,Daniel B. Anderson,Richard T. Hallen,Douglas C. Elliott,Andrew J. Schmidt,Karl O. Albrecht,Todd R. Hart,Mark G. Butcher,Corinne Drennan,Lesley J. Snowden-Swan,Ryan Davis,Christopher Kinchin +12 more
TL;DR: In this article, a preliminary analysis of the costs associated with converting whole wet algal biomass into diesel fuel is presented, where the secondary aqueous product containing significant organic material is converted to a medium btu gas via catalytic hydrothermal gasification.
Journal ArticleDOI
Design and synthesis of selective mesoporous anion traps
Glen E. Fryxell,Jun Liu,Teresa A. Hauser,Zimin Nie,Kim F. Ferris,Shas V. Mattigod,Meiling Gong,Richard T. Hallen +7 more
TL;DR: In this paper, metal-chelated ligands were used as anion binding materials for the removal of arsenate and chromate in the presence of competing anions for solutions containing more than 100 mg/L (ppm) toxic metal anions.
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High resolution FT-ICR mass spectral analysis of bio-oil and residual water soluble organics produced by hydrothermal liquefaction of the marine microalga Nannochloropsis salina
Nilusha Sudasinghe,Barry Dungan,Peter J. Lammers,Karl O. Albrecht,Douglas C. Elliott,Richard T. Hallen,Tanner Schaub +6 more
TL;DR: In this article, a detailed compositional characterization of a bio-crude oil and aqueous byproduct from hydrothermal liquefaction of Nannochloropsis salina by direct infusion Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS) in both positive-and negative-ionization modes is reported.
Journal ArticleDOI
Development of hydrothermal liquefaction and upgrading technologies for lipid-extracted algae conversion to liquid fuels
TL;DR: In this paper, a large-scale lipid-extracted microalgae (LEA) conversion to liquid fuels via hydrothermal liquefaction (HTL) and upgrading processes was investigated.