Browsing USN Open Archive by Author "Jens, Klaus-Joachim"
Now showing items 1-20 of 24
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13C and 15N NMR characterization of amine reactivity and solvent effects in CO2 capture
Perinu, Cristina; Arstad, Bjørnar; Bouzga, Aud Mjærum; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2014)Factors influencing the reactivity of selected amine absorbents for carbon dioxide (CO2) capture, in terms of the tendency to form amine carbamate, have been studied. Four linear primary alkanolamines at varying chain ... -
Absorption and Desorption Study of Alkylamine Promoted DEEA Solvents for CO2 Capture
Bernhardsen, Ida Mortensen; Perinu, Cristina; Jens, Klaus-Joachim; Pinto, Diego Di Domenico; Knuutila, Hanna K (Journal article; Peer reviewed, 2018)Three primary and two secondary mono-alkylamines, and a di-alkylamine (3-(Methylamino)propylamine, MAPA) were investigated in blend with a tertiary amine (2-(Diethylamino)ethanol, DEEA). The aim of the study was to ... -
Application of 15N-NMR spectroscopy to analysis of amine based CO2 capture solvents
Perinu, Cristina; Arachchige, Gumunu L. Samarakoon; Arstad, Bjørnar; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2014)15N NMR spectroscopy is a useful tool for amine reactivity characterization since it can provide information about the availability of the lone pair of electrons on nitrogen through the measured chemical shift values, which ... -
Aqueous Mapa, DEEA, and Their Blend as CO2 Absorbents: Interrelationship between NMR Speciation, pH, and Heat of Absorption Data
Perinu, Cristina; Bernhardsen, Ida; Pinto, Diego Di Domenico; Knuutila, Hanna K; Jens, Klaus-Joachim (Peer reviewed; Journal article, 2019)On the basis of speciation by nuclear magnetic resonance (NMR) spectroscopy, heat of absorption, and pH data, the reactions occurring in aqueous MAPA (3-(methylamino)propylamine), DEEA (2-(diethylamino)ethanol), and their ... -
Chemometric analysis of a new benchmark CO2 capture solvent
Jahanshahi, Saeed (Master thesis, 2022)Greenhouse gases have challenging consequences on climate change and CO2 is one of the most effective elements in this issue. the methods to mitigate these effects such as capturing the carbon dioxide are the aim of this ... -
CO2 Capture by Aqueous 3-(Methylamino)propylamine in Blend with Tertiary Amines: An NMR Analysis
Perinu, Cristina; Bernhardsen, Ida Mortensen; Svendsen, Hallvard Fjøsne; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2017)Aqueous 3-(Methylamino) propylamine (MAPA) in blend with 2-(Diethylamino) ethanol (DEEA) and other tertiary amines, which mainly differ from DEEA in the number of hydroxyl functions (-OH) and/or in the length and structure ... -
CO2 capture by MEA solvent: Chemical Speciation models of CO2 derived species & total solvent alkalinity by multivariate data analysis of FTIR spectra from the CO2 Technology Centre Mongstad
Khatibzadeh, Ayandeh (Master thesis, 2021)This study is the next step of ongoing research at University of South-eastern Norway (USN) to enable multivariate analysis for industrial scale capture process. This study has been done in collaboration with Technology ... -
Demonstration of CO2 Capture Process Monitoring and Solvent Degradation Detection by Chemometrics at the Technology Centre Mongstad CO2 Capture Plant
Wagaarachchige, Jayangi Dinesha; Idris, Zulkifli; Khatibzadeh, Ayandeh; Drageset, Audun; Jens, Klaus-Joachim; Halstensen, Maths (Peer reviewed; Journal article, 2023)Solvent management is one of the important current challenges in post combustion carbon capture (PCC) technology development. Using large-scale 1960 h test campaign data (Technology Centre Mongstad, Norway, 2015 MEA Test), ... -
Equilibria of MEA, DEA and AMP with Bicarbonate and Carbamate: a Raman Study.
Arachchige, Gumunu L. Samarakoon; Andersen, Niels H.; Perinu, Cristina; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2013-08-05)Species distribution analysis in carbonated alkanolamine solution is import in order to estimate accurate thermodynamic properties. The applicability of Raman spectroscopy as an analytical tool for speciation of carbonated ... -
Equilibrium Measurements of the NH3-CO2-H2O System: Speciation Based on Raman Spectroscopy and Multivariate Modeling
Halstensen, Maths; Jilvero, Henrik; Jinadasa, Wathsala; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2017)Liquid speciation is important for reliable process design and optimization of gas-liquid absorption process. Liquid-phase speciation methods are currently available, although they involve tedious and time-consuming ... -
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 (Peer reviewed; Journal article, 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 ... -
Low temperature methanol synthesis catalyzed by copper nanoparticles
Ahoba-Sam, Christian; Olsbye, Unni; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2017)A one pot catalytic system which involves Cu and an alkoxide co-catalyst has been used for methanol (MeOH) synthesis at low temperature. Up to about 92% syngas conversion per pass and more than 90% selectivity to MeOH ... -
Low-Viscosity Nonaqueous Sulfolane-Amine-Methanol Solvent Blend for Reversible CO2 Capture
Wagaarachchige, Jayangi Dinesha; Idris, Zulkifli; Arstad, Bjørnar; Kummamuru, Nithin Bharadwaj; Sætre, Kai Arne; Halstensen, Maths; Jens, Klaus-Joachim (Peer reviewed; Journal article, 2022)In this work, the absorption–desorption performance of CO2 in six new solvent blends of amine (diisopropylamine (DPA), 2-amino-2-methyl-1-propanol (AMP), methyldiethanolamine (MDEA), diethanolamine (DEA), diisopropanolamine ... -
Low-Viscosity Nonaqueous Sulfolane-Amine-Methanol Solvent Blend for Reversible CO2 Capture: Part II. Blend Optimization, Water Effect, and Speciation
Wagaarachchige, Jayangi Dinesha; Idris, Zulkifli; Arstad, Bjørnar; Halstensen, Maths; Jens, Klaus-Joachim (Peer reviewed; Journal article, 2024)This work is part II of the investigation of a low viscosity, low regeneration energy nonaqueous CO2 capture solvent blend consisting of readily available chemicals diisopropylamine (DPA)–methanol–sulfolane and featuring ... -
NMR spectroscopy applied to amine–CO2–H2O systems relevant for post-combustion CO2 capture: A review
Perinu, Cristina; Arstad, Bjørnar; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2014)Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful non-invasive analytical technique for chemical analyses since direct measurements at a molecular level can be performed. In this work, a survey of NMR spectroscopy ... -
NMR-based carbamate decomposition constants of linear primary alkanolamines for CO2 capture
Perinu, Cristina; Arstad, Bjørnar; Bouzga, Aud Mjærum; Svendsen, John Arild; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2014)The amine carbamate related equilibrium (RNHCOO– + H2O ⇆ RNH2 + HCO3–) has been investigated with 13C NMR (Nuclear Magnetic Resonance) spectroscopy for a series of linear primary alkanolamines, and the apparent carbamate ... -
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 ... -
Process Design of a Novel Low Temperature Methanol Synthesis Process Using an Air-blown Autothermal Reformer
Ahoba-Sam, Christian; Øi, Lars Erik; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2018)Methanol (MeOH) synthesis at low temperature (100 oC) presents an opportunity for full syngas conversion per pass. This presents a cheaper alternative for MeOH synthesis using an air-blown autothermal reformer (ATR) rather ... -
Raman Spectroscopy as an Online Monitoring Tool for CO2 Capture Process: Demonstration Using a Laboratory Rig
Jinadasa, Wathsala; Jens, Klaus-Joachim; Øi, Lars Erik; Halstensen, Maths (Journal article; Peer reviewed, 2017)A laboratory CO2 capture rig at USN was used as a demonstration plant to show the feasibility of Raman spectroscopy for online monitoring of speciation in CO2 capture process. The spectroscopy was integrated to lean and ... -
Reducing the CO2 emissions of a gas cracker by reforming fuel gas
Rustad, Emmy Kristine Lindeløff (Master thesis, 2021)With the rising need for CO2 reduction and the pressing two-degree target there is no doubt that measures must be made in the chemical process industry. Ethylene production by steam cracking is a mature and widespread ...