Razvoj membranskega mikroseparatorja

magistrsko delo

Tine Plavčak (Author), Igor Plazl (Mentor), Marjan Marinšek (Thesis defence commission member), Polona Žnidaršič Plazl (Thesis defence commission member)

Abstract

Za ločevanje segmentiranega toka dveh nemešljivih kapljevin v mikroprocesih se lahko uporabi membranski mikroseparator. Gonilna sila pri ločevanju z membrano je razlika v lastnostih omočljivosti med obema fazama. V večini primerov se uporabi hidrofobno membrano, ki prepušča permeat oz. organsko fazo hkrati pa zadržuje retentat oz. vodno fazo. Da membrana začne prepuščati permeat, je treba zagotavljati ustrezno tlačno razliko na membrani, ki je funkcija lastnosti kapljevin oz. njihovih pretokov in dimenzij izhodnih cevi na separatorju. Za uspešno obratovanje membranskega mikroseparatorja mora biti tlačna razlika na membrani vedno manjša od kapilarnega tlaka, ki je funkcija lastnosti membrane in medfazne napetosti. V primerjavi z drugimi separatorji za ločevanje kapljevinskih faz v segmentiranem toku se izkaže, da ima membranski separator večje obratovalno območje, poleg tega ga je precej enostavno izdelati. Najpomembnejša lastnost membranskih mikroseparatorjev je, da lahko pri relativno visokih pretokih zagotavlja stoodstotno čistost faz na iztokih. Pri razvoju mikroprocesov se lahko uporabita dve strategiji: »numbering-up« in »scale-out« z večanjem dimenzij, slednjo sem tudi uporabil pri razvoju membranskega mikroseparatorja. V programu FreeCAD sem naredil dizajn novega mikroseparatorja, s katerim bi lahko opravljal separacije pri višjih pretokih. Eksperimente separacij sem izvajal v sistemih voda-diklorometan, voda-butan-1-ol in voda-heptan pri pretočnem razmerju 1:1. Za totalne pretoke v rangu 1-4 ml/min se je izkazalo, da je bila učinkovitost vseh separacij stoodstotna. Direktna primerjava stoodstotnih separacij z drugimi membranskimi separatorji ni mogoča zaradi uporabe različnih dvofaznih sistemov. Vseeno bi lahko višje pretoke na izdelanem membranskem separatorju verjetno dosegli z zamenjavo membrane, ki bi imela večje pore, kot tudi z implementacijo regulatorja povratnega tlaka.

Keywords

kemijsko mikroprocesno inženirstvo;mikroprocesi;razvoj mikroprocesov;separacija kapljevina-kapljevina;membranski mikroseparator;magistrska dela;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.09 - Master's Thesis
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher:	[T. Plavčak]
UDC:	66-08(043.2)
COBISS:	1538432707
Views:	517
Downloads:	144
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Development of membrane-based microseparator
Secondary abstract:	A segmented flow separation of two immiscible liquids in microprocesses can be achieved by using a membrane microseparator. Driving force of a membrane separation is difference in wetting properties between both liquids. Usually a hydrophobic membrane is used which wets organic phase and retains water phase. In order for the organic phase to pass through membrane pores, a sufficient transmembrane pressure needs to be applied. The transmembrane pressure is function of fluid properties, flow rate and outlet tube dimensions. For a successful separation with the membrane microseparator, transmembrane pressure must be lower than capillary pressure, which is a function of membrane properties and interfacial tension. In comparison to other separators for slug flow separation, membrane microseparators have larger operating window and at the same time, they are easier to manufacture. The most important property of membrane microseparators is ability to completely separate both phases. There are two key strategies for scaling-up microprocesses: a numbering-up and a scale-out by suitable dimension enlarging, the latter one was used for developing my membrane microseparator. FreeCAD was used to design the new microseparator, which would have allow higher flow rates during separation. Separation experiments were conducted for three different two-phase systems: water-dichloromethane, water-n-butanol and water-heptane with flow rate ratio 1:1. For total flow rates in range 1-4 ml/min separation, efficiency was 100%. A direct comparison of 100% separations of other membrane separators cannot be carried out because they were performed in different two-phase systems. Nevertheless higher flow rates in the manufactured membrane microseparator should be achieved by using a membrane with bigger pores and by an implementation of back pressure regulator.
Secondary keywords:	liquid-liquid separation;membrane microseparator;microprocess scale-up;
Type (COBISS):	Master's thesis/paper
Study programme:	1000376
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, smer Kemijsko inženirstvo
Pages:	50 str.
ID:	11225341