Enzyme assisted absorption of CO2 in aqueous solutions of alkanolamines and amino acid ionic liquids

Βλασόπουλος, Δημήτριος; Vlasopoulos, Dimitrios

dc.contributor.author	Βλασόπουλος, Δημήτριος	el
dc.contributor.author	Vlasopoulos, Dimitrios	en
dc.date.accessioned	2020-05-07T15:57:45Z
dc.date.available	2020-05-07T15:57:45Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/50421
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.18119
dc.rights	Default License
dc.subject	Αλκανολαμίνες	el
dc.subject	Ενζυμική απορρόφηση	el
dc.subject	Καρβονική ανυδράση	el
dc.subject	Ιοντικά υγρά	el
dc.subject	Χημική απορρόφηση	el
dc.subject	Carbonic anhydrase	en
dc.subject	Enzymatic absorption	en
dc.subject	CO2	en
dc.subject	Ionic liquids	en
dc.subject	akanolamines	en
dc.title	Enzyme assisted absorption of CO2 in aqueous solutions of alkanolamines and amino acid ionic liquids	en
heal.type	bachelorThesis
heal.classification	Βιοτεχνολογία	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2019-02-19
heal.abstract	Carbon dioxide (CO2) is the major contributor of global warming covering more than 60% of greenhouse gases. Major CΟ2 production occurs by industries and power plants using fossil fuel. Chemical absorption is an effective and widely used, by industries, method for CO2 separation and capture due to low equipment cost, high removal efficiency, stable operation conditions, and mature technology background. Main solvent in industry is the alkanolamines with high absorption rates. Depending on the kind of amine (primary, secondary, tertiary) higher rates have been noticed for Μonoethanolamine (MEA) following by Pentaethylenehexamine (PEHA) and last Methyldiethanolamine (MDEA). As solvents or in mixtures with alkanolamines, the ionic liquids (PEHA-prolinate) offer stability and lower volatility to the system. The use of biocatalysts (enzymes) into the system has been proven to increase the absorption rates useful. Carbonic anhydrase (CA) is a powerful zinc metalloenzyme that accelerates the transformation of carbon dioxide to bicarbonate ion. A mutant version of the carbonic anhydrase has an activity of the order of 4.5 units/μL enzyme solution or 2.07 units/mg of lyophilized enzyme, which remains quite high when the enzyme appears in high temperatures and basic pH. In a tiny clave absorption process the maximum capacity in CO2 differs among the amines with capacity for aqueous solution of MDEA (25% w/w) being 80.7mgCO2/g of solvent, 122.0 mgCO2/g of solvent for the PEHA (25% w/w), 109.5 mgCO2/g of solvent for the MEA (25% w/w) and 82.7 mgCO2/g of solvent for the ionic liquid PEHA-prolinate (25% w/w). The absorption rates for the alkanolamines and the ionic liquid were calculated 0.75 mgCO2/g MDEA (25% w/w) /min, 2.79 mgCO2/g PEHA (25% w/w)/min, 3.12 mgCO2/g MEA (25% w/w)/min and 1.64 mgCO2/g PEHA-prolinate (25% w/w)/min. By adding an enzyme solution (1% w/w), an increase of 40%, 9.32%, 8.01% and 4.88% occurred in the absorption rates of MDEA, PEHA, MEA, PEHA-prolinate respectively. By scaling up the equipment, absorption and stripping rates of alkanolamines and the mixes among them and with ionic liquids were calculated, offering significant results. Specifically, the mix of MDEA-PEHA (1:1 ratio) had an absorption rate higher than the rate of MDEA 25% and close to the rate of the PEHA 25%. The PEHA-prolinate - MDEA (1:1 ratio) did showed a high rate, as well. Experiments were also carried out in a pilot plant for MDEA solution.	en
heal.advisorName	Τόπακας, Ευάγγελος	el
heal.committeeMemberName	Τόπακας, Ευάγγελος	el
heal.committeeMemberName	Κέκος, Δημήτριος	el
heal.committeeMemberName	Κάκαλη, Γλυκερία	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Χημικών Μηχανικών. Τομέας Σύνθεσης και Ανάπτυξης Βιομηχανικών Διαδικασιών (IV). Εργαστήριο Βιοτεχνολογίας	el
heal.academicPublisherID	ntua
heal.fullTextAvailability	true