Title Proizvodnja mikroreaktora od filamenata cikloolefinskog kopolimera Title (english) Production of microreactors from cycloolefin copolymer filaments Author Kristina Sušac Mentor Domagoj Vrsaljko (mentor)Committee member Domagoj Vrsaljko (predsjednik povjerenstva)Committee member Mirela Leskovac (član povjerenstva)Committee member Zvonimir Katančić (član povjerenstva)Granter University of Zagreb Defense date and country 2020-07-16, Croatia Scientific / art field, TECHNICAL SCIENCES Abstract Za izradu mikroreaktora od cikloolefinskog kopolimera (engl. cyclic olefin copolymer, COC) korištena je tehnologija proizvodnje rastaljenim filamentom (engl. fused filament fabrication, FFF), jednom od tehnologija aditivne proizvodnje. Proces započinje crtanjem modela u CAD programu za računalni dizajn Autodesk Fusion 360. Dizajnirani su mikroreaktorski sustavi s različitim promjerom mikrokanala dimenzija 1000 μm, 800 μm , 500 μm, 300 μm i 200 μm koji su korišteni za sintezu metilnih estera viših masnih kiselina (engl. fatty acid methyl ester, FAME) odnosno biodizela. Zbog malih dimenzija mikrokanala i velike međufazne površine, u mikroreaktorima je osigurano brzo miješanje i dobra regulacija temperature u odnosu na klasične procesne reaktore. Na odabir materijala za izradu mikroreaktora utjecalo je dosta čimbenika. Najznačajniji su vrsta kemijske reakcije koja se provodi u mikroreaktorskom sustavu te ponašanje materijala uslijed utjecaja otapala odnosno sama kompatibilnost otapala i materijala, mehanički i optički zahtjevi. Materijali za izradu mikroreaktora moraju biti kemijski inertni te moraju biti kompatibilni s protokolom izrade kako bi se proces provodio brzo i bez puno otpadnog materijala prilikom optimiranja procesnih uvjeta. Kao ispitivani materijal odabran je COC koji je u prethodnim istraživanjima zadovoljio navedene kriterije. U radu je ispitana kemijska otpornost COC-a na način da se određivao stupanj bubrenja te su rezultati pokazali dobru kemijsku otpornost materijala na polarna otapala. Lošija kemijska otpornost COC-a dobivena je prilikom ispitivanja u nepolarnim otapalima. Također, određen je i stvarni promjer dimenzija mikrokanala te prema dobivenim rezultatima dolazi do blagog odstupanja od zadanih dimenzija. Nakon ispitivanja svojstava polimera i rezolucije 3D-ispisa, napravljena je šaržna reakcija sinteze biodizela koja je služila za izradu baždarnih dijagrama iz kojih se zatim računala konverzija ulja iz biodizela za dobivene uzorke iz mikroreaktorskih sustava. Infracrvenom spektrofotometrijskom analizom ustanovljeno je da smanjenje promjera mikrokanala ne utječe na povećanje konverzije ulja u biodizel za cikloolefinski kopolimer kao ni povećanje vremena zadržavanja. Plinskom kromatografijom su potvrđeni dobiveni rezultati te je dobiven detaljniji uvid u sastav biodizela.
Abstract (english) Microreactors made from cycloolefin copolymer (COC) were produced using the fused filament fabrication (FFF) method, which is a technology of additive manufacturing. The process began with a model designed in Autodesk Fusion 360 CAD program. Various microreactor systems were designed with different microchannel diameters, including 1000 μm, 800 μm, 500 μm, 300 μm and 200 μm. These systems were used for the synthesis of fatty acid methyl esters (FAME) i.e. biodiesel. Due to the small dimensions of the microchannels and the large interfacial surface, the microreactors provide fast mixing and satisfying temperature regulation in comparison to conventional process reactors. The choice of materials for the construction of microreactors is influenced by many factors. The most important being the type of chemical reaction carried out in the microreactor system, the behavior of the material due to the influence of solvents (or the compatibility of solvents and materials) and mechanical and optical requirements. The materials for the fabrication of the microreactor must be chemically inert and compatible with the fabrication protocol in order for the process to be carried out quickly, with minimal waste material. COC material met the listed criteria in previous studies and was therefore selected as the test material for this experiment. Chemical resistance of COC was determined by the degree of swelling. The results showed that the material was chemically resistant to polar solvents. When tested against nonpolar solvents, the chemical resistance of COC was reduced. Also, the actual diameter of the microchannel dimensions was determined after the reactors for the experiment were printed. According to the obtained results, there was a very slight deviation from the expected dimensions. After testing the properties of the polymer and the resolution of 3D printing, a batch reaction of biodiesel synthesis was performed. These results were used to make calibration diagrams from which the conversion of oil to biodiesel for the samples obtained from microreactor systems was calculated. Infrared spectrophotometric analysis showed that the reduction in microchannel diameter nor increase the retention time did not affect the increase in oil to biodiesel conversion for the cycloolefin copolymer. Gas chromatography confirmed the obtained results and provided more detailed data on the composition of biodiesel.
Keywords
mikroreaktor
aditivna proizvodnja
FAME
cikloolefinski kopolimer
Keywords (english)
microreactor
additive manufacturing
FAME
cycloolefin copolymer
Language croatian URN:NBN urn:nbn:hr:149:206943 Project Number: UIP-2014-09-3154 Study programme Title: Materials Science and Engineering - Graduate study Type of resource Text File origin Born digital Access conditions Open access Terms of use Created on 2022-04-13 14:00:23
