ABSEQ - Thermodynamic studies

Facility Location
City & country
Trondheim (Norway)
Kolbjørn Hejes vei 1B, 7034
Description & contacts of the access provider
Legal name of organisation
NTNU - Norwegian University of Science and Technology (Norges teknisk-naturvitenskapelige universitet)
Infrastructure contact - Primary contact
Hanna Knuutila
RICC contact - Secondary contact
Morten Grønli
Facility Availability
Unit of access
Availability per year
Minimum 4 weeks
Expected duration of single experiment:
To get enough data suitable for modelling or process evaluations, several experiments are needed. Therefore minimum amount of time required is typically 4-12 weeks depending on the objectives.
Operational or other constraints
Specific risks:
Each activity (including the solvent, gases used) will be risk assessed prior the approval of access. The result of the risk assessment can lead into higher cost due to higher HSE-requirements or terminate the plans.
Legal issues

Understanding the chemical and physical equilibria (VLE) behaviour of the solvent system is maybe the most important data needed for process development and process simulations. The setups available in this infrastructure can be divided into 3 categories:

  • Low and medium pressure VLE setups
  • High pressure VLE setup
  • Calorimeters for heat of absorption and heat of crystallization / dissolution studies.

We have basic analytical possibilities (amine and CO2 titration methods and TOC/TIC/NT) available in our labs.

Density and viscosity setups are presented as part of C1.3.


Low and medium pressure VLE setups: The setups are suitable for measurements up ~6 bars (max~140oC). There are in total 4 equipment. Currently, one of the setups allow direct measurement of amount of CO2 in the gas phase. This equipment can be used up to 80oC. The other setups the CO2 amount absorbed and present in the gas phase is based on mass balance.  The choice of setup is dependent on the solvent as well as temperatures and pressures used.

Amount solvent needed from 150 ml to 500 ml depending on the setup. (see image "One of the autoclaves used to measure VLE")


High pressure VLE setup: This setup allows measurements up to 200 bar and 200oC. Methane is allowed in the setup and the equipment is typically used for high pressure applications, or for applications where methane solubility is of interest. Both liquid and gas phase are sampled and analysed with GC. Due to high pressures and experiments are very time consuming. Due to the high pressures, this setups requires intensive training and this cost has to be covered separately.

Volume of the cell is ~60ml and the minimum operating pressure is 5 bar. (see image "High pressure setup with GC")


Calorimeters: We have two calorimeters for the heat of absorption of CO2 studies. Furthermore, one of the setups can be used heat of crystallization/dissolution studies. Easily measurements up to 10bar can be done, but with some modification up to 20bar (or even higher) and 200oC can be reached.

The volumes of the calorimetric reactors 2L and 250 cm3. (see image "The calorimeter setup with 250 cm3 reactor")

One of the autoclaves used to measure VLE
High pressure setup with GC
The calorimeter setup with 250 cm3 reactor
Overview of the lab
State of the art, uniqueness, & specific advantages
  • The installations C1.3, C1.4 and C1.5, designed for CO2 capture research, are located in the same campus making it possible to combine equilibria experiments with solvent degradation or absorption kinetic studies.
  • The laboratory has a close co-operation with external analytical laboratory (SITNEF Industry) offering services to analyse liquid samples for degradation products and specific amines.
Scientific Environment
  • We have basic analytical possibilities (amine and CO2 titration methods and TOC/TIC/NT) available in our labs. Analytical laboratory at SINTEF Industry (Biotechnology and Nanomedicine –department), located in the same campus offers good possibilities to analyse the solutions for degradation compounds.
  • Density and viscosity setups are presented as part of C1.3.
  • The setups are used by master and PhD-students as well as researchers. We have a close co-operation with Department of Process Technology in SINTEF Industry. Through exchange of PhD students and research personnel we currently collaborate with CSIRO (Australia) and Department of Chemical Engineering, University of Austin, Texas. 

selected publications

Hartono, A., Rennemo, R., Awais, M., Vevelstad, S.J., Brakstad, O.G., Kim, I., Knuutila, H.K. (2017)
Characterization of 2-Piperidineethanol and 1-(2-Hydroxyethyl)piperidine as strong bicarbonate forming solvents for CO2 Capture
International Journal of Greenhouse Gas Control 63, 260-271
Bernhardsen, I.M., Krokvik, I.R.T., Perinu, C., Pinto, D.D.D., Jens, K.-J., Knuutila, H.K. (2018)
Influence of pKa on solvent performance of MAPA promoted tertiary amines
International Journal of Greenhouse Gas Control 68, 68-76
Hartono, A., Kim, I., Knuutila, H.K., van der Ham, L.V., Goetheer, E. (2017)
Calorimetric Studies of Precipitating Solvent System
Energy Procedia 114, 744-755
Monteiro, J.G.M.S., Pinto, D.D.D., Zaidy, S.A.H., Hartono, A., Svendsen, H.F. (2013)
VLE data and modelling of aqueous N,N-diethylethanolamine (DEEA) solutions
International Journal of Greenhouse Gas Control 19, 432-440
Kim I. et al. (2009)
Enthalpy of absorption of CO2 with alkanolamine solutions predicted from reaction equilibrium constants
Chem. Eng. Science, 2009, 64, pp2027-2038
Ugochukwu E. Aronu, Shahla Gondal, Erik T. Hessen, Tore Haug-Warberg, Ardi Hartono, Karl A. Hoff, Hallvard F. Svendsen (2011)
Solubility of CO2 in 15, 30, 45 and 60 mass% MEA from 40 to 120 °C and model representation using the extended UNIQUAC framework
Chemical Engineering Science, 66 (24), 2011, 6393-6406
Knuutila, H., Hessen, E.T., Kim, I., Haug-Warberg, T., Svendsen, H.F. (2010)
Vapor–liquid equilibrium in the sodium carbonate–sodium bicarbonate–water–CO2-system
Chemical Engineering Science 65, 2218-2226