Professional Activities

  • 1979 – 1985 Study of Chemistry, University of Dortmund
  • 1985 – 1989 Scientific co-worker in the group of Prof. Gmehling (Institute for Chemical Engineering, Univ. of Dortmund
  • 1991 PhD at University of Dortmund (Institute for Chemical Engineering)
  • since 1989 Scientific co-worker with Prof. Gmehling at University of Oldenburg
  • Director of DDBST GmbH, Oldenburg
  • since 2004 Honorary Research Fellow at the School of Chemical Engineering, University of Kwazulu-Natal, Durban, South Africa
  • since 2005 Honorary Professor (Kwazulu-Natal, Durban, South Africa)

Co-author of DECHEMA Chemistry Data Series (4 books), approx. 40 publications in scientific journals.

Short Bio:

I studied and graduated in Chemistry and did my PhD in Chemical Engineering. Built my first computer in the 3rd year of study and developed some interfacing to lab equipment and control software. Got fascinated by the possibilities of simulation and learned the importance of the correct description of basic phenomena on the outcome of simulations (garbage in – garbage out).

In 1989 near the end of my PhD study I moved to Oldenburg in northern Germany. Since April 1989 I have a permanent position at the University of Oldenburg in the group of Prof. Gmehling.

In the same year I co-founded DDBST GmbH. This company today is the most well known provider of thermophysical property data and estimation methods for process simulation and further applications in safety, environmental protection, ….

Since the 80’s I teach many courses on applied thermodynamics for chemical process simulation for external participants from industry both in Oldenburg and in-house for companies in Europe, the US, Middle East, South Africa, Japan, … (alone or together with Prof. Gmehling).

A further role in professional life is a honorary Prof. position in Durban, SA. Currently my group there consists of 4 MSc and one PhD student, all highly motivated. We developed and published estimation methods for a number of important properties like vapor pressure, liquid viscosity, water and alkane solubility, … The first of our methods on normal boiling point is already generally regarded as the primary and best method available.

Professional Activities

Researcher at the Chair of Industrial Chemistry, University of Oldenburg, Oldenburg, Germany (since 1989)
  • lectures and tutorials in “Introduction to Industrial Chemistry”, “Chemical Processes”, Unit Operations” and “Reaction Engineering”
  • lectures on software development and mathematical methods in chemical engineering, applied thermodynamics and physical property estimation
  • regular courses in chemical process simulation using Aspen Plus
  • project management and co-supervision of BSc, MSc and PhD students as well as guests
  • regular courses “Fundamentals of Selection, Synthesis and Design of Thermal Separation Processes”
  • research in the fields of quantum chemical estimation methods for thermophysical properties of pure components and mixtures
  • research in the development of improved gE mixing rules for equations of state
  • support for the development of experimental setups for different types of measurements

Co-Founder and Managing Director of DDBST GmbH, Oldenburg, Germany

  • supervision of software development
  • customer support
  • marketing, web server development, info material, product presentations
  • development and regular improvement of a software package for the simultaneous correlation of different phase equilibrium and excess properties (RECVAL/3, sole developer)

Private Lecturer for Various Courses in German and English Language at Different Sites Worldwide (During the last 10 years about 600 participants from industry and further from academia took part in these courses, e.g. at Mitsubishi Chemical Company (Japan), DSM (The Netherlands), DOW Chemical (Germany), Ciba Speciality Chemicals (Switzerland), SABIC (Saudi Arabia), Lyondell (USA), EPCON (USA), RIPI (Iran) and many more.)

  • Grundlagen zur Auswahl, Synthese und Auslegung thermischer Trennprozesse
  • Fundamentals of Selection, Synthesis and Design of Thermal Separation Processes
  • Thermodynamische Stoffdaten für die Synthese, Auslegung und Simulation chemischer Prozesse (DECHEMA, Frankfurt)
  • DDB and Process Simulation
  • DDB-DDBSP Introduction
  • Advanced Physical Properties for Process Simulation

Honorary Research Fellow (since 2003) and Honorary Professor (2005 to 2013) at the School of Chemical Engineering, University of Kwazulu-Natal, South Africa (in Cooperation with Prof. Dr. D. Ramjugernath)

  • Development of Physical Property Estimation Methods for
    • normal boiling temperature (published, reported in Perry’s Handbook, recommended by DIPPR as primary method)
    • vapor pressure as function of temperature (published)
    • vapor-liquid critical data (published)
    • liquid viscosity (published)
    • surface tension (under development)
    • thermal conductivity (under development)
    • activity of complex molecules (pharmaceuticals, …) in common solvents (publication in preparation)
  • Improvement of GE Models by Non-Linear Transformation in Composition Space (published and in preparation)
  • Adjustable Hybrid GE Models for the Estimation of Phase Equilibria and Excess Properties for Process Simulation with Separated Treatment of Dispersive, Polar and Hydrogen-Bonding Interactions.
  • Exact GE Mixing Rule for Equations of State by G-Transformation
  • Development of Computer-Operated Equipment for the Determination of Thermophysical Properties (in Cooperation with Dr. Paramespri Naidoo)

Further research interests are in the field of experimental determination of thermophysical properties, esp. with respect to the development of modern computer-operated equipment. In the past I had already developed a high precision static aparatus, which is now in nearly continuous use for about 20 years. Several further instruments have been constructed based on this design (LTP-Oldenburg, VLE AUTOLAB).

Scientific Papers

2016 Experimental solubility for betulin and estrone in various solvents within the temperature range T = (293.2 to 328.2) K Kuveneshan Moodley, Jürgen Rarey, Deresh Ramjugernath The Journal of Chemical Thermodynamics, Volume 98, July 2016, Pages 42–50
2015 Saturation vapor pressures and transition enthalpies of low-volatility organic molecules of atmospheric relevance: from dicarboxylic acids to complex mixtures. Bilde, M.; Barsanti, K.; Booth, A.; Cappa, C. D.; Donahue, N.; Emanuelsson, E.; McFiggans, G.; Krieger, U.; Marcolli, C; Topping, D; Ziemann, P; Barley, M; Clegg, S; Dennis-Smither, B.; Hallquist, M.; Hallquist, Å.; Khlystov, A.; Kulmala, M.; Mogensen, D.; Percival, C.; Pope, F.; Reid, J.; Rosenoern, T.; Ribeiro da Silva, M.; Salo, K.; Soonsin, V.; Yli-Juuti, T.; Prisle, N.; Pagels, J.; Rarey, J.; Zardini, A.; Riipinen, I. Chemical Reviews, 2015, 115(10), 4115-4156, DOI: 10.1021/cr5005502
Extension of the GE Model FlexQUAC to Asymmetric Systems – Nonlinear Transformation of the Surface Fraction in the Residual Part J. Rarey, T. Naidoo, D. Ramjugernath IEC Research, in preparation
Model Evaluation for the Prediction of Solubility in Complex Pharmaceutical Molecules K. Moodley, J. Rarey, D. Ramjugernath In preparation
2015 A Universal Segment Approach for the Prediction of the Activity Coefficient of Complex Pharmaceuticals in Non-electrolyte Solvents K. Moodley, J. Rarey, D. Ramjugernath Fluid Phase Equilibria, Volume 396, 25 June 2015, Pages 98–110
Estimation of the Normal Boiling Point and Vapor Pressure of Non-Electrolyte Organic Compounds via Group Contributions and Group Interactions – Revision and Extension II J. Champion, J. Rarey, D. Ramjugernath In preparation
Estimation of Pure Component Properties, Part 6: Estimation of the Surface Tension of Non-Electrolyte Organic Liquids via Group Contributions E. Olivier, J. Rarey, D. Ramjugernath In preparation
Estimation of Pure Component Properties, Part 5: Estimation of the Thermal Conductivity of Non-Electrolyte Organic Liquids via Group Contributions O. Govender, J. Rarey, D. Ramjugernath to be submitted
Group Contribution Method for the Prediction of the Infinite Dilution Activity Coefficient of Non-Electrolyte Organic Compounds in Saturated Hydrocarbons B. Moller, J. Rarey, D. Ramjugernath In preparation
Group Contribution Method for the Prediction of the Infinite Dilution Activity Coefficient of Non-Electrolyte Organic Compounds in Water B. Moller, J. Rarey, D. Ramjugernath In preparation
2013 Application of the bio-inspired Krill Herd optimization technique to phase equilibrium calculations K. Moodley, J. Rarey, D. Ramjugernath Fluid Phase Equil., 74, (2015), 75-88
doi:10.1016/j.compchemeng.2014.12.008
 2015 Measurement, correlation and prediction of isothermal vapor-liquid equilibria of different systems containing vegetable oil  P. C. Belting, R. Böltz, J. Rarey, J. Gmehling, R. Ceriani, O. Chiavone-Filho, A. J.A. Meirelles Fluid Phase Equilibria,Volume 395, 15 June 2015, Pages 15–25
 2014 Excess enthalpies for pseudobinary mixtures containing vegetable oils at the temperatures 298.15 K, 353.15 K and 383.15 K  P. C. Belting, R. Böltz, J. Rarey, J. Gmehling, R. Ceriani, O. Chiavone-Filho, A. J.A. Meirelles Fluid Phase Equilibria, Volume 375, 15 August 2014, Pages 124–133
 2014 Measurements of Activity Coefficients at Infinite Dilution in Vegetable Oils and Capric Acid Using the Dilutor Technique  P. C. Belting, J. Rarey, J. Gmehling, R. Ceriani, O. Chiavone-Filho, A. J.A. Meirelles Fluid Phase Equilibria, Volume 361, 15 January 2014, Pages 215–222
 2013 Estimation of the Vapor Pressure of Non-Electrolyte Organic Compounds via Group Contributions and Group Interactions – Revision and Extension  B. Moller, J. Rarey, D. Ramjugernath under revision
 2013 Estimation of Pure Component Properties:
Biodiesel Related Components – Fatty Acid Methyl Esters, Fatty Acids and Triglycerides
 Thomas Wallek, Jürgen
Rarey, Jürgen O. Metzger, Jürgen Gmehling
Ind. Eng. Chem. Res., 2013, 52 (47), pp 16966–16978
 2013 On the Calculation of Activity Coefficients: Proposed Hybrid Methodology for Group Contribution Methods  B.
J. Satola, J. Rarey, D. Ramjugernath
 AIChE
J., submitted for publication (8-2013)
 2014 Extrapolation/Interpolation of Infinite Dilution Activity Coefficient As Well As Liquid and Solid Solubility between Solvents: Part 1. Alkane Solvents  B.
Moller, J. Rarey, D. Ramjugernath

Volume 361, 15 January 2014, Pages 69–82

 2013 Prediction of the solubility of selected pharmaceuticals in water and alcohols with a group contribution method  A. Pelczarska,
D. Ramjugernath, J. Rarey, U. Domańska
J. Chem. Thermod. 62, (2013), 118-129 http://dx.doi.org/10.1016/j.jct.2013.02.007
2013 Activity coefficient at infinite dilution measurements for organic solutes (polar and non-polar) in fatty compounds – Part II: C18 fatty acids P. C. Belting, J. Rarey, J. Gmehling, R. Ceriani, O. Chiavone-Filho, A. J.A. Meirelles J. Chem. Thermod. 60, (2013), 142-149
2012 Activity coefficient at infinite dilution measurements for organic solutes (polar and non-polar) in fatty compounds: Saturated fatty acids P. C. Belting, J. Rarey, J. Gmehling, R. Ceriani, O. Chiavone-Filho, A. J.A. Meirelles J. Chem. Thermod. 55, (2012), 42-49
http://dx.doi.org/10.1016/j.jct.2012.06.009
2009 Group Contribution Prediction of Surface Charge Density Distribution of Molecules for COSMO- SAC Mu T., Rarey J., Gmehling J. AIChE J., 55, 12, 3298 3300 (2009)
2009 Factual Data Banks and their Application to the Synthesis and Design of Chemical Processes and the Development and Testing of Thermophysical Property Estimation Methods Rarey J., Gmehling J. Pure Appl.Chem., 81, 10, 1745 1768 (2009)
2009 Recommended NRTL Model Parameters by Simultaneous Correlation of VLE, Infinite Dilution Activity Coefficients and Excess Enthalpy Data Tochigi K., Rarey J., Gmehling J. J.Chem.Eng.Japan, 42, 6, 376 380 (2009)
2009 Estimation of pure component properties. Part 4: Estimation of the saturated liquid viscosity of non-electrolyte organic compounds via group contributions and group interactions Nannoolal Y., Rarey J., Ramjugernath D. Fluid Phase Equilib., 281 (2), 97 119 (2009)
2009 Application of COSMO-RS Type Models to the Prediction of Excess Enthalpies Constantinescu D., Rarey J., Gmehling J. Ind.Eng.Chem.Res., 277, 1,8710-8725 (2009)
2008 Reply to: Comments on Performance of COSMO-RS with Sigma Profiles from Different Model Chemistries Mu T., Rarey J., Gmehling Ind.Eng.Chem.Res., 47, 3, 989 989 (2008)
2008 Estimation of the vapour pressure of non-electrolyte organic compounds via group contributions and group interactions Moller B., Rarey J., Ramjugernath D. J.Mol.Liq., 143, 1, 52 63 (2008)
2008 Estimation of pure component properties: Part 3. Estimation of the vapor pressure of non-electrolyte organic compounds via group contributions and group interactions Nannoolal Y., Rarey J., Ramjugernath D. Fluid Phase Equilib., 269(1-2), 117-133 (2008)
2007 Estimation of pure component properties Part 2. Estimation of critical property data by group contribution Nannoolal Y., Rarey J., Ramjugernath J. Fluid Phase Equilib., 252, 1-2, 1 27 (2007)
2007 Performance of COSMO-RS with Sigma Profiles from Different Model Chemistries Mu T., Rarey J., Gmehling J. Ind.Eng.Chem.Res., 46, 20, 6612 6629 (2007)
2007 Group Contribution Prediction of Surface Charge Density Profiles for COSMO-RS(Ol) Mu T., Rarey J., Gmehling J. AIChE J., 53, 12, 3231 3240 (2007)
2007 Quality Assurance in Thermodynamic Databases for Performance Assessment Studies in Waste Disposal Voigt W., Brendler V., Marsh K., Rarey R., Wanner H., Gaune-Escard M., Cloke P., Vercouter Th., Bastrakov E., Hagemann S. Pure Appl.Chem., 79, 5, 883 894 (2007)
2006 Prediction of Liquid Heat Capacities by the Group Contribution Equation of State VTPR Diedrichs A., Rarey J., Gmehling J. Fluid Phase Equilib., 248, 1, 56 69 (2006)
2005 Extended Flexibility for GE Models and Simultaneous Description of Vapor-Liquid Equilibrium and Liquid-Liquid Equilibrium using a Nonlinear Transformation of the Concentration Dependence Rarey J. Ind.Eng.Chem.Res., 44, 19, 7600 7608 (2005)
2004 Estimation of Pure Component Properties. Part 1. Estimation of the Normal Boiling Point of Non-Electrolyte Organic Compounds via Group Contributions and Group Interactions Nannoolal Y., Rarey J., Ramjugernath D., Cordes W. Fluid Phase Equilib., 226, 1, 45 63 (2004)
2002 A new method for the estimation of the normal boiling point of non-electrolyte organic compounds Cordes W., Rarey J. Fluid Phase Equilib., 201, 19, 409 433 (2002)
2000 Computer-Controlled Vibrating Tube Densimeter for Liquid Density Measurement in a Wide Temperature and Pressure Range Ihmels C., Aufderhaar C., Rarey J., Gmehling J. Chem.Eng.Technol., 23, 5, 409 412 (2000)
1999 Vapor-Liquid Equilibria and Vapor Pressure Data for the Systems Ethyl tert-Butyl Ether + Ethanol and Ethyl tert-Butyl Ether and Water Rarey J., Horstmann S., Gmehling J. J.Chem.Eng.Data, 44, 3, 532 538 (1999)
1999 Isothermal Vapor-Liquid Equilibrium and Excess Enthalpy Data for the Binary Systems Diethyl Ether + Ethyl tert-Butyl Ether, 1-Pentene + Methyl Acetate, and Propene + 2-Propanol Horstmann S., Gardeler H., Boelts R., Rarey J., Gmehling J. J.Chem.Eng.Data, 44, 3, 383 387 (1999)
1999 Computergestuetzte Messung von Fluessigkeitsdichten in einem weiten Temperatur- und Druckbereich Ihmels E.C., Fiege C., Rarey J., Gmehling J. Chem.Ing.Tech., 71, 6, 605 609 (1999)
1999 Vapor-Liquid Equilibria and Vapor Pressure Data for the Systems Ethyl tert-Butyl Ether + Ethanol and Ethyl tert-Butyl Ether and Water Rarey J., Horstmann S., Gmehling J. J.Chem.Eng.Data, 44, 3, 532 538 (1999)
1998 Vapor-liquid equilibria at six temperatures from 313.15 K to 402.15 K and excess enthalpy data at 363.15 K and 1.65 Mpa for the system toluene + 2,2,4- trimethylpentane (isooctane) Gardeler H., Horstmann S., Tsuboi A., Toba S., Rarey J., Gmehling J. Eldata Int.Electron.J.Phys.-Chem.Data, 4, 1, 1 10 (1998)
1998 Vapor-liquid equilibria at six temperatures from 313.15 K to 402.15 K and excess enthalpy data at 363.15 K and 1.65 Mpa for the system toluene + 2,2,4- trimethylpentane (isooctane) Gardeler H., Horstmann S., Tsuboi A., Toba S., Rarey J., Gmehling J. Eldata Int.Electron.J.Phys.-Chem.Data, 4, 5, 1 10 (1998)
1996 Vapor-liquid equilibria for the system water + tert.-pentanol at 4 temperatures Fischer K., Shulgin I., Rarey J., Gmehling J. Fluid Phase Equilib., 120, 5, 143 165 (1996)
1996 Vapor-liquid equilibria for the system water + tert.-pentanol at 4 temperatures Fischer K., Shulgin I., Rarey J., Gmehling J. Fluid Phase Equilib., 120, 4, 143 165 (1996)
1995 Entwicklung von Modellen und Korrelationen zur Beschreibung von Reinstoffeigenschaften Rarey J., Cordes W., Neumann S., Kraehenbuehl M.A., Gmehling J. Chem.Ing.Tech., 67, 7, 907 912 (1995)
1995 Simultane Korrelation der Daten Rarey J.R. Unpublished Data, 25, 3, 1 7 (1995)
1994 Vapor-Liquid and Liquid-Liquid Equilibria for the Toluene + 1,2-Propanediol + Water System Fele L., Fermeglia M., Alessi P., Rarey J.R., Golob J. J.Chem.Eng.Data, 39, 4, 735 741 (1994)
1993 Computergesteuertes statistisches Ebulliometer zur Bestimmung zuverlaessiger Dampf-/Fluessig-Gleichgewichtsdaten Rarey J., Gmehling J. Chem.Ing.Tech., 65, 3, 308 310 (1993)
1993 Computer-Operated Differential Static Apparatus for the Measurement of Vapor-Liquid Equilibrium Data Rarey J., Gmehling J. Fluid Phase Equilib., 83, 10, 279 287 (1993)
1993 Vapour Pressure of Ethyl tert-Butyl Ether Rarey J. Private Communication, 6, 3, 1 2 (1993)
1991 Experimentelle und theoretische Untersuchung zur Beschreibung von fluessigen Nichtelektrolytsystemen Rarey J.R. Thesis, 50, 4, 0 0 (1991)
1989 The Dortmund Data Bank: A Computerized System for Retrieval, Correlation, and Prediction of Thermodynamic Properties of Mixtures Onken U., Rarey-Nies J., Gmehling J. Int.J.Thermophys., 10, 3, 739 747 (1989)
1989 Ermittlung Optimaler Modellparameter zur Beschreibung des realen Verhaltens von Nichtelektrolytsystemen durch simultane Anpassung an verschiedene Thermodynamische Daten Rarey-Nies J.R., Tiltmann D., Gmehling J. Chem.Ing.Tech., 61, 5, 407 410 (1989)
1988 Gas Solubility Data Bank for further Development of Phase Equilibrium Models Molnar-Jobbagy M., Rarey-Nies J., Gmehling J. Fluid Phase Equilib., 42, 4, 185 194 (1988)
1986 Darstellung des Dampf-Fluessig-Gleichgewichtsverhaltens von Formaldehyd-Wasser-Methanol Systemen Rarey J. Master’s Thesis, 5, 3, 1 152 (1986)
1984 Test der modifizierten UNIFAC-Methode zur Vorhersage von Dampf-Flüssig-Gleichgewichten, Aktivitätskoeffizienten bei unendlicher Verdünnung und Exzeßenthalpie-Daten Rarey J. Student Research Project, 55, 12, 1 75 (1984)

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