Browsing NTNU Open by Author "Knuutila, Hanna K"
Now showing items 21-40 of 51
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Development of membrane contactors using volatile amine-based absorbents for CO2 capture: amine permeation through the membrane
Ansaloni, Luca; Rennemo, Rune; Knuutila, Hanna K; Deng, Liyuan (Journal article; Peer reviewed, 2017)Non-porous membrane contactor offers the possibility to reduce the amine emissions if the membrane layer is specifically designed to act as a barrier for the amine transport. In the present paper, the amine permeation ... -
Effect of Amine Volatility on Aerosol Droplet Development in Absorption Columns
Majeed, Hammad; Knuutila, Hanna K; Hillestad, Magne; Svendsen, Hallvard Fjøsne (Journal article; Peer reviewed, 2017)In absorption processes aerosols are generated by spontaneous condensation or desublimation processes in supersaturated gas phases. Amine volatility is a vital screening parameter for amines to be used in CO2 capture. ... -
Effect of liquid viscosity on the performance of a non-porous membrane contactor for CO2 capture
Bernhardsen, Ida; Ansaloni, Luca; Betten, Hanne Kalvøy; Deng, Liyuan; Knuutila, Hanna K (Journal article; Peer reviewed, 2019)The effect of liquid viscosity on the performance of a non-porous membrane contactor is important to study for a proper solvent selection and process design. In this work, the overall mass transfer coefficient for MEA- and ... -
Effect of the concentration of MAPA on the heat of absorption of CO2 and on the cyclic capacity in DEEA-MAPA blends
Knuutila, Hanna K; Nannestad, Åsne (Journal article; Peer reviewed, 2017)n this work, the heat of absorption of CO2 in aqueous blends of 2-(diethylamino)ethanol (DEEA) and 3-(methylamino)propylamine (MAPA) were measured as a function of CO2 loading at 40 °C, 80 °C and 120 °C. The main objective ... -
Effect of Various Parameters on the Thermal Stability and Corrosion of CO2-Loaded Tertiary Amine Blends
Shoukat, Usman; Knuutila, Hanna K (Peer reviewed; Journal article, 2020)In this study, the thermal stability and corrosivity of various CO2-loaded tertiary amine blends in both aqueous and non-aqueous form in stainless steel cylinders were studied for combined acid gas and water removal. The ... -
Experimental investigation of inlet vane design and performance in hydrocarbon systems
Setekleiv, Alf Eddie; Knuutila, Hanna K (Journal article; Peer reviewed, 2019)Separation efficiencies for a scrubber inlet vane section was investigated using a natural gas hydrocarbon system at 20, 50 and 85 bars. Several design features were investigated such as diameter of inlet pipe, vane design, ... -
Extensive dataset for oxidative degradation of ethanolamine at 55-75 °C and oxygen concentrations from 6 to 98%
Vevelstad, Solrun Johanne; Johansen, Maren T; Knuutila, Hanna K; Svendsen, Hallvard Fjøsne (Journal article; Peer reviewed, 2016)Post combustion CO2 capture using amines as chemical absorbents is a relatively mature technology. Rate of reaction and desorption energy demand are normally prime criteria for evaluation of new solvents while degradation ... -
Gas phase amine depletaion created by aerosol formation and growth
Majeed, Hammad; Knuutila, Hanna K; Hillestad, Magne; Svendsen, Hallvard Fjøsne (Journal article; Peer reviewed, 2017)Aerosols are systems of droplets or wet particles suspended in gases. In post combustion CO2 absorption systems aerosols can be formed by spontaneous phase transitions in supersaturated gas phases or by droplets or particles ... -
High-Capacity Amine-Imidazole Solvent Blends for CO2 Capture
Evjen, Sigvart; Fiksdahl, Anne; Knuutila, Hanna K (Journal article; Peer reviewed, 2019)The CO2 absorption performance of aqueous solvent blends containing four imidazoles (2-MeIm, 2-Et-4-MeIm, 2,4,5-MeIm and 1,2,4,5-MeIm) and four promoters (MEA, DEA, PZ, and MAPA) were investigated using a small-scale ... -
Hydrogen Sulfide Solubility in 50 wt.% and 70 wt.% Aqueous Methyldiethanolamine at Temperatures from 283 to 393 K and Total Pressures from 500 to 10000 kPa
Skylogianni, Eirini; Mundal, Ingvild; Pinto, Diego Di Domenico; Coquelet, Christophe; Knuutila, Hanna K (Peer reviewed; Journal article, 2020)The hydrogen sulfide (H2S) absorption capacity of a 70 wt% aqueous methyldiethanolamine (MDEA) solution was investigated in a static-analytic apparatus at temperatures of 283, 353 and 393 K and pressures of 2000, 6000 and ... -
Influence of pKa on solvent performance of MAPA promoted tertiary amines
Bernhardsen, Ida Mortensen; Krokvik, Iris Renate Tøkje; Perinu, Cristina; Pinto, Diego Di Domenico; Jens, Klaus-Joachim; Knuutila, Hanna K (Journal article; Peer reviewed, 2018)In the present work, absorption and desorption performance of ten single tertiary amines and their blends with MAPA was studied using a screening apparatus. Absorption experiments were conducted at 40 °C and up to 9.5 kPa ... -
Influence of substitution of water by organic solvents in amine solutions on absorption of CO2
Garcia, Monica; Knuutila, Hanna K; Aronu, Ugochukwu Edwin; Gu, Sai (Journal article; Peer reviewed, 2018)Aqueous amine solutions are the most used solvents for chemical absorption of CO2. Substituting part of the water by organic solvents in aqueous amine solutions aims to take advantage of the lower partial pressure and ... -
Investigating opportunities for water-lean solvents in CO2 capture: VLE and heat of absorption in water-lean solvents containing MEA
Wanderley, Ricardo Ramos; Pinto, Diego Di Domenico; Knuutila, Hanna K (Journal article; Peer reviewed, 2020)A thorough investigation on a set of organic diluents for water-lean solvent formulation has been carried in this work. The performance of aqueous monoethanolamine (MEA) 30 %w/w has been compared to that of mixtures between ... -
Kinetics of CO2 absorption into aqueous solutions of 3-dimethylamino-1-propanol and 1-(2-hydroxyethyl)pyrrolidine in the blend with 3-(methylamino)propylamine
Bernhardsen, Ida; Knuutila, Hanna K (Journal article, 2019)The kinetics of CO2 absorption into unloaded aqueous solutions of 3-dimethylamino-1-propanol (3DMA1P) and 1-(2-hydroxyethyl)pyrrolidine (1-(2HE)PRLD) blended with 3-(methylamino)propylamine (MAPA) were studied in the ... -
New Polyalkylated Imidazoles Tailored for Carbon Dioxide Capture
Evjen, Sigvart; Fiksdahl, Anne; Pinto, Diego Di Domenico; Knuutila, Hanna K (Journal article; Peer reviewed, 2018)Aqueous polyalkylated imidazoles have gained interest as potential CO2 capture solvents due to their high oxidative stability and low vapor pressures compared to traditional amines. In this work, 21 aqueous solutions of ... -
New solvent blends for post-combustion CO2 capture
Knuutila, Hanna K; Rennamo, Rune; Çiftja, Arlinda (Journal article; Peer reviewed, 2019)In the current work five different solvent blends are experimentally studied and the reboiler duties are calculated using the so-called short-cut method. Tertiary amines, 2-(diethylamino)ethanol (DEEA), 3-(Diethylamino)- ... -
NMR Speciation of Aqueous MAPA, Tertiary Amines, and Their Blends in the Presence of CO2: Influence of pKa and Reaction Mechanisms
Perinu, Cristina; Bernhardsen, Ida Mortensen; Pinto, Diego Di Domenico; Knuutila, Hanna K; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2018)The diamine 3-(methylamino)propylamine (MAPA) and eight tertiary amines were studied as single and blended aqueous CO2 absorbents at different concentrations and ratios to investigate their reaction mechanisms. After ... -
Performance of MAPA promoted tertiary amine systems for CO2 absorption: Influence of alkyl chain length and hydroxyl groups
Bernhardsen, Ida Mortensen; Krokvik, Iris Renate Tøkje; Jens, Klaus-Joachim; Knuutila, Hanna K (Journal article; Peer reviewed, 2017)Absorption and desorption of CO2 into five aqueous tertiary amine solvents and their blends with MAPA were studied using a screening apparatus. Results showed that MAPA significantly enhanced both CO2 absorption rate and ... -
Predicting aerosol size distribution development in absorption columns
Majeed, Hammad; Hillestad, Magne; Knuutila, Hanna K; Svendsen, Hallvard Fjøsne (Journal article; Peer reviewed, 2018)There are two main mechanisms for amine emissions from absorption columns. The first is connected to the volatility of amine, determining the gaseous concentration. The second mechanism is via aerosol droplets containing ... -
Predicting ionic liquid melting points using machine learning
Venkatraman, Vishwesh; Evjen, Sigvart; Knuutila, Hanna K; Fiksdahl, Anne; Alsberg, Bjørn Kåre (Journal article; Peer reviewed, 2018)The melting point (Tm) of an ionic liquid (IL) is of crucial importance in many applications. The Tm can vary considerably depending on the choice of the anion and cation. This study explores the use of various machine ...