Kees Hogendoorn

University of Twente

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G.F. Versteeg

University of Groningen

Sascha R.A. Kersten

University of Twente

Elly Hoekstra

University of Twente

Wim P. M. van Swaaij

University of Twente

P.W.J. Derks

Equinor (Norway)

Michiel J. Groeneveld

University of Twente

Roel J. M. Westerhof

University of Twente

Ferran de Miguel Mercader

Scion

P.J. Darda

National Chemical Laboratory

Dietrich Meier

Swiss Council for Accident Prevention

Cooperative Institutions

University of Twente

DSM (Netherlands)

Shell (Netherlands)

Biomass Technology Group (Netherlands)

Institut für Holztechnologie Dresden

Energy Research Centre of the Netherlands

Ghent University

Hamburg Institute of International Economics

Institute of Wood Science and Technology

Universidad de Zaragoza

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Experimental determination of H2S and CO2 solubility data in aqueous amine solutions and a comparison with an Electrolyte Equation of State

P.J.G. Huttenhuis Pramod Agrawal Kees Hogendoorn G.F. Versteeg

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Citations (1)

Heterogenized homogeneous systems

Kees Hogendoorn

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Citations (0)

Selective desulfurisation of natural gas using copper sulfate solutions - Process design and economic evaluation

H. ter Maat Kees Hogendoorn C. J. Asselbergs G.F. Versteeg

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Hydrodeoxygenation of pyrolysis oil fractions: process understanding and quality assessment through co-processing in refinery units

Energy & Environmental Science (2011)

Ferran de Miguel Mercader Michiel J. Groeneveld Sascha R.A. Kersten Christophe Geantet G. Toussaint

Hydrodeoxygenation (HDO) of pyrolysis oil fractions was studied to better understand the HDO of whole pyrolysis oil and to assess the possibility to use individual upgrading routes for these fractions. By mixing pyrolysis oil and water in a 2 : 1 weight ratio, two fractions were obtained: an oil fraction (OFWA) containing 32 wt% of the organics from the whole oil and an aqueous fraction water addition (AFWA) with the remaining organics. These fractions (and also the whole pyrolysis oil as the reference) were treated under HDO conditions at different temperatures (220, 270 and 310 °C), a constant total pressure of 190 bar, and using 5 wt% Ru/C catalyst. An oil product phase was obtained from all the feedstocks; even from AFWA, 29 wt% oil yield was obtained. Quality parameters (such as coking tendency and H/C) for the resulting HDO oils differed considerably, with the quality of the oil from AFWA being the highest. These HDO oils were evaluated by co-processing with an excess of fossil feeds in catalytic cracking and hydrodesulfurisation (HDS) lab-scale units. All co-processing experiments were successfully conducted without operational problems. Despite the quality differences of the (pure) HDO oils, the product yields upon catalytic cracking of their blends with Long Residue were similar. During co-processing of HDO oils and straight run gas oil in a HDS unit, competition between HDS and HDO reactions was observed without permanent catalyst deactivation. The resulting molecular weight distribution of the co-processed HDO/fossil oil was similar to when hydrotreating only fossil oil and independent of the origin of the HDO oil.

Hydrodeoxygenation

Refinery

Pyrolysis oil

10.1039/c0ee00523a

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Citations (209)

Solubility of Carbon Dioxide in Aqueous Blends of Piperazine and N-Methyldiethanolamine

P.W.J. Derks Kees Hogendoorn G.F. Versteeg

Piperazine

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Determination of polybutylene terephthalate polycondensation equilibrium constant using a batch reactor

Macromolecular Symposia (2004)

P.J. Darda Kees Hogendoorn Tjaart Molenkamp G.F. Versteeg

Abstract The PBT polycondensation equilibrium constant at 255°C was determined using a batch reactor. Starting from a Polybutylene terephthalate (PBT) prepolymer having a degree of polymerisation of 12.7, equilibrium experiments were performed in the range of 1 to 50 mbar. The equilibrium degree of polymerisation ( i ) was determined indirectly using dilute solution viscometry of a solution of 1 weight % PBT in m ‐ cresol. The degree of polymerisation of PBT obtained at equilibrium in the range of 1 to 50 mbar at 255°C as a function of the BDO partial pressure (mbar) could be expressed by: i = 111.47 − 86.18 exp (−1.14 $P^{-1.44}_{bdo}$ ). The equilibrium solubility of 1,4 butanediol (BDO) in the PBT melt was derived form the BDO partial pressure using the Flory ‐ Huggins theory. The PBT polycondensation reaction equilibrium constant was related to the degree of polymerisation by the equation: $K_e = {0.187 \over 1 -19243 e^{-0.3932}} $ in the range i = 26 − 100. The PBT polycondensation equilibrium constant at high degrees of polymerisation is in line with literature data and thermodynamics.

Polybutylene terephthalate

Degree of polymerization

10.1002/masy.200450222

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Citations (7)

The applicability of activities in kinetic expressions: a more fundamental approach to represent the kinetics of the system CO2-OH- salt in terms of activities

J. Haubrock Kees Hogendoorn G.F. Versteeg

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Possibilities and pitfalls in analyzing (upgraded) pyrolysis oil by size exclusion chromatography (SEC)

Journal of Analytical and Applied Pyrolysis (2011)

Elly Hoekstra Sascha R.A. Kersten A.J. Tüdös Dietrich Meier Kees Hogendoorn

Polystyrene

Fraction (chemistry)

Pyrolysis oil

Molar mass distribution

Gel permeation chromatography

Response factor

10.1016/j.jaap.2011.01.006

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Citations (54)

Fast pyrolysis in a novel wire-mesh reactor: Decomposition of pine wood and model compounds

Chemical Engineering Journal (2012)

Elly Hoekstra Wim P. M. van Swaaij Sascha R.A. Kersten Kees Hogendoorn

Levoglucosan

tar (computing)

10.1016/j.cej.2012.01.118

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Citations (90)

Heterogeneous and homogeneous reactions of pyrolysis vapors from pine wood

AIChE Journal (2011)

Elly Hoekstra Roel J. M. Westerhof D.W.F. Brilman Wim P. M. van Swaaij Sascha R.A. Kersten

Abstract To maximize oil yields in the fast pyrolysis of biomass it is generally accepted that vapors need to be rapidly quenched. The influence of the heterogeneous and homogeneous vapor‐phase reactions on yields and oil composition were studied using a fluidized‐bed reactor. Even high concentrations of mineral low char (till 55 vol %) appeared not to be catalytically active. However, the presence of minerals, either in biomass or added, does influence the yields, especially by the occurrence of vapor‐phase charring/polymerization reactions. Contradictory, in the absence of minerals, homogeneous vapor‐phase cracking reactions were dominant over polymerization/charring reactions (400–550°C, 1–15 s). With increasing vapor residence time, the oil yield reached an asymptotic value, which decreased with temperature. At a vapor temperature of 400°C no decrease in oil yield was observed, but dedicated analysis showed that homogeneous vapor to vapor reactions had occurred. © 2011 American Institute of Chemical Engineers AIChE J, 2012

Charring

Mineral oil

Vapor phase

10.1002/aic.12799

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Citations (93)