Even Solbraa
About
Senior advisor at Equinor and professor at NTNU in gas technology. The focus of my work includes field development, digitalization in the process industry, future field development, energy-efficient and low CO2 solutions, gas processing, and flow assurance. Current work involves the evaluation and development of thermodynamic models for CO2 and hydrogen.
See master thesis and PhD works I have supervised.
Have a look at the website we are developing for teaching, programming, and process simulation related to gas technology.
Ongoing research and student projects:
- Digitalization in gas process technology
- Thermodynamics and physical properties of hydrogen and carbon dioxide
- Development of processes for unmanned field operation
- CO2 removal, injection, and storage
- Gas processing (acid gas, dehydration, dew point control)
- Subsea processing (development of new processes)
- Thermodynamics of oil and gas
- Flow assurance (wax control, hydrate control, scale)
- Development of digital twins in process industry
- Artificial inteligence (AI) technologies in process industry
Teaching:
- Natural Gas Technology (TEP4185)
- Natural gas, CO2 and hydrogen processing (TEP08)
Active involvement in developing simulation software for thermodynamic calculations and process simulations (NeqSim). The simulation tool is developed in Java, with toolboxes in Matlab and Python. Students with interest for programming and process simulation is encouraged to take part in the development. The NeqSim source code is available from GitHub. Companies that are interested in scientific work (master/PhD) related to thermodynamics, process simulation, programming, machine learning can be involved by suggesting future focus and development.
Research
- Digitalization in gas technolog
- Thermodynamics and physical propeties of hydrogen and carbon dioxide
- Development of proceses for unmanned field operation
- CO2 removal, injection and storage
- Gas Processing (acid gas, dehydration, dew point control)
- Subsea processing (development of new processes)
- Thermodynamics of oil and gas
- Flow assurance (wax control, hydrate control, scale)
Publications
Papers in international scientific journals
George Tasios, Vasiliki Louli, Efstathios Skouras, Even Solbraa, Epaminondas Voutsas, Thermodynamic modelling of systems involved in natural gas dehydration with triethylene glycol using a group contribution association model, Fluid Phase Equilibria
Volume 588, January–February 2025, 114241
A. Tassios, Solbraa, E. et al., Development of a New Group Contribution Equation of State for associating compounds
Fluid Phase EquilibriaISSN: 03783812Volume: 571, Article2023EID: 2-s2.0-85153049537, DOI: 10.1016/j.fluid.2023.113824
Trancoso J., Solbraa, E. et.al, Vapor-Liquid Equilibrium Measurements and Cubic-Plus-Association Modeling of Triethylene Glycol Systems
Journal of Chemical and Engineering DataISSN: 00219568Volume: 69Issue: 10, Pages: 3544 - 3554
Daniel Qvistgaard, Georgios M. Kontogeorgis, Xiaodong Liang, Julia Trancoso, Even Solbraa, Nicolas von Solms, Parameterization and uncertainty analysis of binary interaction parameters for triethylene glycol and ethane/propane, Fluid Phase Equilibria, Volume 570, July 2023
Daniel Qvistgaard, Julia Trancoso, Even Solbraa, Marie Vikre Danielsen, Eleni Panteli, Georgios M. Kontogeorgis, Nicolas von Solms, Multicomponent vapor-liquid equilibrium measurements and modeling of triethylene glycol, water, and natural gas mixtures at 6.0, 9.0 and 12.5 MPa, Fluid Phase Equilibria, Volume 565, February 2023
Julia Trancoso; Julia Trancoso; Daniel Qvistgaard; Marie V. Danielsen; Eleni Panteli; Even Solbraa; Georgios Kontogeorgis; Nicolas von Solms, Vapor–Liquid Equilibrium Measurements and Cubic-Plus-Association Modeling of Triethylene Glycol + Water + Methane Systems at 6.0 and 12.5 MPa, Journal of Chemical & Engineering Data, 2022
FJ Kruger, GM Kontogeorgis, E Solbraa, N von Solms, Undersøiske fabrikker: Naturgasproduktion direkte fra havbunden, Dansk Kemi, 2018
FJ Kruger, GM Kontogeorgis, E Solbraa, N von Solms Multicomponent Vapor–Liquid Equilibrium Measurement and Modeling of Ethylene Glycol, Water, and Natural Gas Mixtures at 6 and 12.5 MPa, Journal of Chemical & Engineering Data, 2018
Francois J. Kruger, Marie V. Danielsen, Georgios M. Kontogeorgis, et al, Ternary Vapor–Liquid Equilibrium Measurements and Modeling of Ethylene Glycol (1) + Water (2) + Methane (3) Systems at 6 and 12.5 MPa, Journal of Chemical and Engineering Data, May 1, 2018
Eirini Skylogianni, Nefeli Novak, Vasiliki Louli ,Georgia D Pappa, Christos Boukouvalas, Stathis Skouras, Even Solbraa, Epaminondas C Voutsas, Measurement and prediction of dew points of six natural gases, Fluid Phase Equilibria, 2016
M Frost, GM Kontogeorgis, N von Solms, E Solbraa, Modeling of phase equilibrium of North Sea oils with water and MEG, Fluid Phase Equilibria, 2016
M Frost, GM Kontogeorgis, N von Solms, T Haugum, Phase equilibrium of North Sea oils with polar chemicals: Experiments and CPA modeling, Fluid Phase Equilibria, 2016
Sadegh, N., Thomsen, K., Solbraa, E., Johannessen, E., Rudolfsen, G.I., Berg, O.J., Solubility of hydrogen sulfide in aqueous solutions of N-methyldiethanolamine at high pressures, Fluid Phase Equilibria, Volume 393, Pages 33–39, 2015
Sadegh, N., Thomsen, K., Solbraa, E., Johannessen, E., Vapor-liquid equilibrium and density data for CO2-MDEA-H2O and MDEA-H2O systems, to be submitted to Fluid Phase Equilibra, 2015
Vasiliki, K., Riaz, M., Aas, N., Solbraa, E., Voutsas, E.C., Kontogeorgis, G.M., Distribution of chemicals in oil-water systems, in review, 2015
Riaz, M., Yussuf, M.A., Frost, M., Kontogeorgis, G.M., Stenby, E.H., Yan, W., Solbraa, E., Distribution of gas-hydrate-inhibitor (MEG) in condensate and water systems: Experimental measurement and thermodynamic modeling using the CPA EoS, Energy Fuels, 28 (5), pp 3530–3538, 2014
Bartholdy, S., Bjørner, M.G., Solbraa, E., Shapiro, A., Kontogeorgis, G.M., Capabilities and Limitations of Predictive Engineering Theories for Multicomponent Adsorption, Industrial & Engineering Chemistry Research, Vol. 52, No. 33, 2013, p. 11552-11563, 2013¨
Frost, M., Kontogeorgis, G.M., Stenby. E.H., Haugum, T., Christensen, K.O., Solbraa, E., Løkken, T.V., Liquid – Liquid Equilibria for Reservoir Fluids + Glycol and Reservoir Fluids + Glycol + Water: Experimental measurements and modeling using CPA EoS, Fluid Phase Equilibria, Volume 340, 25, Pages 1–6, 2013
Riaz, M., Yussuf, M.A. ,Kontogeorgis, G.M., Stenby, E.H., Yan, W., Solbraa, E., Distribution of MEG and methanol in well-defined hydrocarbon and water systems: Experimental measurement and modeling using the CPA EoS, Fluid Phase Equilibria, Vol. 337, 2013, p. 298-310.
Louli, V., Pappa, G., Boukouvalas, C., Skouras, S., Solbraa, E., Christensen, K.O., Voutsas,E., Measurement and Prediction of Dew Point Curves of Natural Gas Mixtures, Fluid Phase Equilibria, Volume 334, 25 November 2012, Pages 1-9
B. Jensen, B. Kvamme, T. Kuznetsova, K. O. Christensen, A. C. M. Miguens, and E. Solbraa. “Evaluation of Zeolite LTA-Force Fields for Molecular Dynamics Simulation Purposes”. Molecular Simulation 7 - Forcefields. Presented by Bjørn Kvamme. Eighteenth Symposium on Thermophysical Properties. June 2012
Nilssen, H.N., Fredheim, A.O., Berg, O., Solbraa, E., Kvamme, B., Equilibrium Phase Densities, Vapor Phase Compositions and Interfacial Tensions for Methane + Ethane + n-Pentane System at 294.15 K, Journal of Chemical and Engineering Data, Volume 56 (11), 2011, Pages 4006-4011
Riaz., M., Kontogeorgis, G., Stenby, E.H., Yan, W., Haugum, T., Christensen, K.O., Solbraa, E., Løkken, T.V., Measurement of Liquid-Liquid Equilibria for Condensate + Monoethylene-Glycol and Condensate + Monoethylene-Glycol + Water Systems, Journal of Chemical and Engineering Data, Volume 56 (12), 2011, Pages 4342-4351
Longman, Z., Burgass, R., Chapoy, A.,Tohidi, B., Solbraa, E., Measurement and modelling of CO2 frost points in the CO2-methane systems, Journal of Chemical and Engineering Data, Volume 56 (6), 2011, Pages 2971-2975
Nilsen, H.N., Fredheim, A., Berg, O., Solbraa, E, Kvamme, B., Equilibrium phase densities, interfacial tensions for methane + n-pentane and ethane + n-pentane systems at 294.15 K, Journal of Chemical & Engineering Data, Volume 56 (5), 2011, Pages 2128-2132
Riaz., M., Kontogeorgis, G., Stenby, E.H., Yan, W., Haugum, T., Christensen, K.O., Solbraa, E., Løkken, T.V., Mutual solubility of MEG, water and reservoir fluid: Experimental measurements and modeling using the CPA equation of state, Fluid Phase Equilibria, Volume 300, Issues 1-2, 25 January 2011, Pages 172-181
Hui Nilssen, Arne Fredheim, Even Solbraa, Bjørn Kvamme, Theoretical Prediction of Interfacial Tensions for Hydrocarbon Mixtures with Gradient Theory in Combination with Peng-Robinson Equation of State, Offshore Technology Conference , Proceedings of the Annual Offshore Technology Conference, May 2010
Zhang, L, Solbraa, E., Solid phase behaviour in offshore natural gas liquefaction concepts, Chinese Journal of Chemical Engineering, 2009
Huttenhuis, P.J.G. , Agrawal, N.J., Solbraa, E., Versteeg, G.F., The solubility of carbon dioxide in aqueous N-methyldiethanolamine solutions, Fluid Phase Equilibria, Volume 264, Issues 1-2, 1 March 2008, Pages 99-112
Folas, G.K., Kontogeorgis,G.M., Solbraa, E., Re: A.H. Mohammadi and D. Richon on “Data and prediction of water content of high pressure nitrogen, methane and natural gas” [Fluid Phase Equilibria 252 (2007) 162–174], ,Fluid Phase Equilibria, Volume 255, Issue 1, 1 July 2007, Page 98,
Folas, G.K., Froyna, E.W., Lovland, J., Kontogeorgis, G.M., Solbraa, E., Data and prediction of water content of high pressure nitrogen, methane and natural gas, Fluid Phase Equilibria, Volume 252, Issues 1-2, 1 March 2007, Pages 162-174
Folas, G.K., Berg, O.J., Solbraa, E., Fredheim, A.O., Kontogeorgis, G.M., Michelsen, M.L., Stenby, E.H., High-pressure vapor–liquid equilibria of systems containing ethylene glycol, water and methane: Experimental measurements and modeling, Fluid Phase Equilibria, Volume 251, Issue 1, 15 January 2007, Pages 52-58
Austegard, A., Solbraa, E., De Koeijer, G., Mølnvik, M.J., Thermodynamic Models for Calculating Mutual Solubilities in H2O–CO2–CH4 Mixtures, Chemical Engineering Research and Design, Volume 84, Issue 9, September 2006, Pages 781-794
Folas, G., Kontogeorgis, G., Michelsen, M.L., Stenby, E.H., Solbraa, E., Liquid-liquid equilibria for binary and ternary systems containing glycols, aromatic hydrocarbons, and water: Experimental measurements and modeling with the CPA EoS, Journal of Chemical and Engineering Data, Vol: 51, Issue: 3, 2006, Pages 977-983
Mørch, Ø., Nasrifar, Kh., Bolland, O., Solbraa, E., Fredheim, A.O., Gjertsen, L.H., Measurement and modeling of hydrocarbon dew points for five synthetic natural gas mixtures, Fluid Phase Equilibria, Volume 239, Issue 2, 31 January 2006, Pages 138-145
de Koeijer, G., Solbraa, E., High pressure gas sweetening with amines for reducing CO2 emissions, Greenhouse Gas Control Technologies 7, 2005, Pages 1147-1152,
Papers/presentations in international conferences
Even Solbraa, Sviatoslav Eroshkin, Tania Ferreira Byrkjeland, Siri Margrete Madsen, Kwaku Ennin Afoakwa, Endre Jacobsen, Virtual Measurement of Emissions from Produced Water Using an Online Process Simulator, 41st Global Flow Measurement Workshop, October, 2023
Solbraa, E., Online process simulation for natural gas dehydration processes, Invited Lecture, 63rd International Conference of Scandinavian Simulation Society, Trondheim, SIMS 2022
Kari Børset Skjerve, Frode Martinsen, Even Solbraa, and Øystein Espelid, Equinor ASA, ECalc - A Computationally Efficient Tool for Emission Forecasting, SPE Norway Subsurface Conference, April 2022
Solbraa, E., Thermodynamic models in online process simulation – experiences from condition monitoring of TEG dehydration processes, invited lecture, DTU and CERE discussion meeting, Denmark, 2022
Hui Nilssen, Arne Fredheim, Even Solbraa, Bjørn Kvamme, Theoretical Prediction of Interfacial Tensions for Hydrocarbon Mixtures with Gradient Theory in Combination with Peng-Robinson Equation of State, Offshore Technology Conference, Houston, Texas, USA, May 2010.
Hui Nilssen, Arne Fredheim, Even Solbraa, Bjørn Kvamme, Special Session Title: High Pressure Gas-Liquid Separation; paper proposal title: Theoretical Prediction of Interfacial Tensions for Hydrocarbon mixtures with Gradient Theory in Combination with Peng-Robinson Equation of State, Offshore Technology Conference, Houston, Texas, USA, May 2010.
Christensen, K.O., Skouras E., Solbraa, E., Løkken, T.V., Aase, B.Ø.,Ovesen, R.V.,Aaserud, C., Online prediction of liquid drop-out in rich gas pipelines, Seoul Korea, IGRC 2011
Skouras E., Solbraa, E., Christensen, K.O., Løkken, T.V., Aase, B.Ø.,Ovesen, R.V.,Aaserud, C., Online cricondenbar monitoring in rich gas pipelines, European Symposium on Applied Thermodynamics, June 24-27, Saint Petersburg, Russia, 2011
de Koeijer, G., Solbraa, E., Nazarian, B., Phase Behaviour of CH4 in CO2 in CCS Chains for Natural Gas Production, 1st Brazil CO2 Congress, Rio de Janeiro, April 2011
Zhang, L., Solbraa, E., Prediction of solubility of n-Hexane and other heavy hydrocarbons in LNG processes, GPA 90th Annual convention, April 3-6, San Antonio, Texas, 2011
Solbraa, E., Invited speaker for plenary lecture: Carbon capture and storage experiences from the Sleipner field, Distillation & Absorption 2010, 12-15. September, Eindhoven NL, 2010
Riaz., M., Kontogeorgis, G., Stenby, E.H., Yan, W., Haugum, T., Christensen, K.O., Solbraa, E., Løkken, T.V., Mutual Solubility of MEG, Water and Reservoir Fluid: Experimental Measurements and Modeling using the CPA Equation of State, Special Symposium on SAFT 2010, proceeding pages: 62
Nilssen, H.N., Fredheim, A.O., Solbraa, E., Kvamme, B., Theoretical Prediction of Interfacial Tensions for Hydrocarbon Mixtures with Gradient Theory in Combination with Peng-Robinson Equation of State, Offshore Technology Conference (OTC), 3-6 May 2010, Houston, Texas, USA
Skouras, E., Louli, V., Pappa, G., Boukouvalas, Ch., Solbraa, E., Voutsas, E., Dew point prediction of synthetic and real natural gas mixtures with the UMR-PRU model, 19th International congress of Chemical and Process Engineering, CHISA 2010, 28. August - 1. September, Prague, Czech Republic, 2010
Riaz, M., Kontogeorgis, G., Stenby, E.H., Wei, Y., Haugum, T., Christensen, K.O., Solbraa, E., Løkken, T.V., Mutual Solubility of MEG, Water and Reservoir Fluid: Experimental Measurements and Modeling using the CPA Equation of State, 19th International congress of Chemical and Process Engineering, CHISA 2010, 28. August - 1. September, Prague, Czech Republic, 2010
Adi Wijaya R.N., Solbraa E., Fredheim A.O., Evaluation of Thermodynamic models for the prediction of solid N-alkanes precipitation, 11th Cryogenics International Conference, April 26-29, Bratislava – Slovakia, 2010
Zhang, L., Solbraa, E., Prediction of solid fluid phase equilibrium in gas processing at low temperature,1st Trondheim Gas Technology Conference, 21-22nd October, 2009
Zhang, L., Solbraa, E., Solid phase behavior in offshore natural gas liquefaction concepts, The Second China LNG Forum, Shanghai, China, September, 2009
Skouras, E., Voutsas, E., Louli, V., Solbraa, E., Proceedings ESAT 2009, Santiago de Compostela, Spain, 2009
Rusten, B.H., Gjertsen, L.H., Solbraa, E., Kirkerød, T., Haugum, T. Puntervold, S., Determination of the phase envelope – crucial for process design and problem solving, GPA 87th Annual Conference, Texas, 2008
Løkken, T.V., Besrås, A., Nygaard, C.F., Solbraa, E., Water content of high pressure natural gas: Data, prediction and experience from field, International Gas Research Conference (IGRC) 2008, Paris, 2008
Laughton, A, Gronemann, U., Benito, A, Kukova, E., Kaesler, H., Van Caneghem, P., Velde, B., Solvang, S., Lindgren, T:, Panneman, H.J., Laguerre, D., Dusart, O., Papworth, D., Viglietti, B., Maghini, F., Solbraa, E., Werner, J., Comparison Of Commercially Available Software Packages For Hydrocarbon Dew Point Calculation Against Each Other And Experimental Data, 23rd World Gas Conference, Amsterdam, 2006
Solbraa, E, Folas, G., invited plenary speaker, Measurement and calculation of
water, ice and hydrate precipitation temperatures from high pressure natural gas, 22nd European Symposium on Applied Thermodynamics 2006, Lo-skolen, Elsinore, Denmark, 28 June - 1 July, 2006
Folas, G., Kontogeorgis, G., Michelsen, M.L., Stenby, E.H. ; Solraa, Even Presented at: ESAT 2006 22nd European Symposium on Applied Thermodynamics, 2006, Lo-skolen, Elsinore, Denmark, 28 June - 1 July, 2006
Folas, G.K., Kontogeorgis, G.M., Michelsen, M.L., Stenby, E.H., Solbraa, E., Recent Advances with the Cubic – Plus – Association Equation of State, AICHE 2006, San Francisco, 2006
de Koeijer, G., Solbraa, E., High pressure gas sweetening with amines for reducing CO2 emissions, GHGT 7, 5– September 2004, Vancouver, Canada, 2004
Solbraa, E., Tangvik, K., Removal of Carbondioxide from Natural Gas at Well Stream Pressures, IGRC conference 2001, Amsterdam, 2001
Solbraa, E:, Tangvik, K., Mass Transfer and Kinetics of Absorption of Carbondioxide into Methyldiethanolamine Solutions at High Pressures, AICHE Annual Meeting 2000, Los Angeles, 2000
Norwegian national conference papers and presentations
Solbraaa, E., Løkken, T.V., Analyse av kvalitet for naturgass, Temadag og årsmøte Norsk forening for olje og gassmålng (NOFGM) 19/3, 2010
Solbraa, E., Acid Gas Removal: Problem description and experiences from the Sleipner field, Gas Technology Center, Technical Seminar on Natural Gas Processing, NTNU, 28th April 2008
Solbraa, E., CO2-removal at Sleipner – impact of fundamentals, TEKNA årlige gassprosesseringskonferanse, Tønsberg, 2006
2011
-
Nilssen, Hui Nie;
Fredheim, Arne Olav;
Berg, Ole J;
Solbraa, Even;
Kvamme, Bjørn.
(2011)
Equilibrium Phase Densities, Vapor Phase Compositions, and Interfacial Tensions for the Methane plus Ethane plus n-Pentane System at 294.15 K.
Journal of Chemical and Engineering Data
Academic article
-
Zhang, Longman;
Burgass, Rod;
Chapoy, Antonin;
Tohidi, Bahman;
Solbraa, Even.
(2011)
Measurement and Modeling of CO2 Frost Points in the CO2-Methane Systems.
Journal of Chemical and Engineering Data
Academic article
-
Nilssen, Hui Nie;
Fredheim, Arne Olav;
Berg, Ole J;
Solbraa, Even;
Kvamme, Bjørn.
(2011)
Equilibrium Phase Densities, Interfacial Tensions for the Ethane plus n-Pentane System at 294.15 K.
Journal of Chemical and Engineering Data
Academic article
Journal publications
-
Nilssen, Hui Nie;
Fredheim, Arne Olav;
Berg, Ole J;
Solbraa, Even;
Kvamme, Bjørn.
(2011)
Equilibrium Phase Densities, Vapor Phase Compositions, and Interfacial Tensions for the Methane plus Ethane plus n-Pentane System at 294.15 K.
Journal of Chemical and Engineering Data
Academic article
-
Zhang, Longman;
Burgass, Rod;
Chapoy, Antonin;
Tohidi, Bahman;
Solbraa, Even.
(2011)
Measurement and Modeling of CO2 Frost Points in the CO2-Methane Systems.
Journal of Chemical and Engineering Data
Academic article
-
Nilssen, Hui Nie;
Fredheim, Arne Olav;
Berg, Ole J;
Solbraa, Even;
Kvamme, Bjørn.
(2011)
Equilibrium Phase Densities, Interfacial Tensions for the Ethane plus n-Pentane System at 294.15 K.
Journal of Chemical and Engineering Data
Academic article