diplomsko delo
Katja Kuzmič (Author), Julija Volmajer Valh (Mentor), Simona Vajnhandl (Co-mentor)

Abstract

Poliester v kategoriji polimernih materialov zaradi široke uporabnosti zavzema visok delež v svetovni proizvodnji tekstila in plastičnih mas, ki neprestano narašča. Z ekonomskega in okoljevarstvenega vidika je zato potrebno recikliranje. Tekom diplomskega dela smo poliestrna vlakna reciklirali po postopku nevtralne hidrolize v visokotemperaturnem in visokotlačnem reaktorju. Produkte hidrolize smo nato okarakterizirali z metodo infrardeče spektroskopije s Fourierjevo transformacijo in z metodo potenciometričnih titracij v nevodnem mediju z uporabo treh različnih topil (dimetil sulfoksida, kombinacija topil toluena in etanola ter benzil alkohola) z namenom določitve končnih karboksilnih skupin. Na podlagi dobljenih rezultatov smo lahko sklepali o učinkovitosti depolimerizacije pri različnih reakcijskih pogojih. Ugotovili smo, da se poliestrna vlakna najbolje razgradijo pri reakcijskih pogojih 250 °C, masno razmerje vlakna : voda 1:10 in 30 min reakcijskega časa po doseženi željeni temperaturi in tlaku. Dimetil sulfoksid se je izkazal za najustreznejše topilo za določitev končnih karboksilnih skupin s potenciometrično titracijo produktov v obliki prahu, benzil alkohol pa za produkte v obliki vlaken.

Keywords

poliester;recikliranje;hidroliza;titracije;diplomske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [K. Kuzmič]
UDC: 677.494.674.017(043.2)
COBISS: 21110550 Link will open in a new window
Views: 1240
Downloads: 170
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Other data

Secondary language: English
Secondary title: Characterization of polyester fibers degradation products after chemical recycling
Secondary abstract: Polyester in category of polymer materials holds a major share in global production of textiles and plastics that is growing constantly. From economic and environmental aspect, recycling is essential for this matter. During diploma work, polyester fibres were recycled by using neutral hydrolysis process in high-temperature and high-pressure reactor. Products of hydrolysis were characterised using Fourier transform infrared (FTIR) spectroscopy and potentiometric titrations in non-aqueous solutions. Three different solvents were used: dimethyl sulfoxide (DMSO), combination of toluene and ethanol, and benzyl alcohol, with the aim to determinate number of available carboxyl end-groups. Based on the results, conclusions were made on the depolymerisation efficiency under different reaction conditions. We established that the most successful fibre degradation rate was by reaction conditions of 250°C, mass ratio of fibre and water 1:10 and 30 minute reaction time after reaching desired temperature and pressure conditions. Dimethyl sulfoxide (DMSO) turned out to be the most suitable solvent for determination of available carboxyl end-groups by potentiometric titrations of powder-form products and benzyl alcohol for titrations of fibre-form products.
Secondary keywords: polyester;recycling;hydrolysis;titrations;FTIR;
URN: URN:SI:UM:
Type (COBISS): Bachelor thesis/paper
Thesis comment: Univ. v Mariboru, Fak. za strojništvo, Tehniško varstvo okolja
Pages: X, 38 f.
ID: 10859216