Title Novi statički mikseri za milireaktore Title (english) New static mixers for millireactors Author Božana Đuranović Mentor Domagoj Vrsaljko (mentor)Committee member Domagoj Vrsaljko (predsjednik povjerenstva)Committee member Fabio Faraguna (član povjerenstva)Committee member Lidija Furač (član povjerenstva)Granter University of Zagreb Defense date and country 2019-09-26, Croatia Scientific / art field, TECHNICAL SCIENCES Abstract Potrebe za reaktorima velikih volumena se smanjuju zbog trenutačnih tržišnih zahtjeva koji potenciraju prijelaz s masovne proizvodnje na personaliziranu. Takav prijelaz bi moglo olakšati uvođenje mikroreaktorskih sustava umjesto konvencionalnih reaktora, barem za neke specifične industrije, poput kemijske i farmaceutske. Mikroreaktorske sustave, u koje spadaju nano, mikro i milireaktori, odlikuje bolji prijenos tvari i energije u usporedbi s konvencionalnim reaktorima što rezultira i povećanjem učinkovitosti procesa. Dodatno poboljšanje prijenosa tvari i energije moguće je postići dodatkom statičkih miksera unutar mikroreaktorskih sustava što utječe i na produktivnost samog procesa. Cilj ovog rada bio je razviti i izraditi milireaktore iste geometrije s različitim brojem statičkih elemenata te ispitati njihov utjecaj na konverziju. Četiri milireaktora su izrađena stereolitografijom, postupkom aditvne proizvodnje. Cijevni milireaktor je jedan od izrađenih milireaktora koji služi kao referentni, dok ostala tri imaju ugrađen različiti broj statičkih elemenata unutar kanala. U milireaktorima se provodila Fentonova reakcija obezbojivanja bojila Reactive Blue 182 te se uzorak na izlazu iz milireaktora spektrofotometrijski analizirao. Ukupna konverzija reakcije je proračunata iz vrijednosti molarnih protoka bojila na početku i kraju reakcije. Očekivana su laminarna strujanja u milireaktorima što je procjenjeno pomoću vrijednosti Reynoldsove značajke izračunate za cijevni milireaktor. Tijekom provedbe reakcije potvrđeno je uspostavljanje laminarnog strujanja. Pri manjim vrijednostima protoka jasno je vidljivo laminarno strujanje, dok se kod većih vrijednosti protoka uočava burno miješanje ulaznih struja reaktanata. Tijekom provođenja Fentonovih reakcija uočen je rast konverzija reakcija u milireaktorima sa statičkim mikserima.
Abstract (english) Need for reactors with big volumes is shrinking because of current market requirements that are inducing transition from massive to personal production. That transition could ease the introduction of microreactor systems instead of conventional reactors, at least for certain industries, such as chemical or pharmaceutical. Microreactor systems, that include nano, micro and millireactors, are characterized my better transfer of mass and energy when compared to conventional reactors, which in turn results in increased efficiency of processes. Additional improvement in mass and energy transfer is possible to achieve by adding static mixers within the microreactor systems, which affects the efficiency of the process itself. Aim of this paper is to develop and produce millireactors of the same geometry with different number of static elements, whilst also to test their effect on the conversion. Four millireactors have been manufactured using stereolitography, an additive production procedure. Tubular millireactor is one of the produced millireactors that serves as a benchmark, while three other millireactors have been different number of static mixers within the channels. Fenton reaction has been carried out within the millireactors, which rendered the colouring, Reactive Blue 182, colourless, while the sample at the exit of the millireactor has been spectrophotometrically analysed. Total conversion of the reaction has been calculated from the values of molar colouring flow-through at the beginning and the end of the reaction. Laminar flow was expected to manifest inside the millireactors. That was estimated using Reynolds numbers calculated for the tubular millireactor. Through performing the experiment, laminar flow has been confirmed. With lower flow-through volume, laminar flow is clearly seen, while in higher flow-through volume scenarios turbulent mixing of reactant entry currents is observed. By performing the Fenton reactions a relatively consistent increase of reaction conversions with static mixers in the millireactors is observed.
Keywords
aditivna proizvodnja
stereolitografija
milireaktor
statički mikseri
Fentonova reakcija
Keywords (english)
additive manufacturing
stereolithography
millireactor
static mixers
Fenton reaction
Language croatian URN:NBN urn:nbn:hr:149:234495 Project Number: UIP-2014-09-3154 Study programme Title: Environmental Engineering - Graduate study Type of resource Text File origin Born digital Access conditions Closed access Terms of use Created on 2022-02-17 11:01:23
