Yliopiston etusivulle Suomeksi På svenska In English Helsingin yliopisto

Kinetic models for supercritical fluid extraction and supercritical fluid extraction of lipids from microalgae

Show full item record

Files in this item

Files Size Format View

There are no files associated with this item.

Use this URL to link or cite this item: http://hdl.handle.net/10138/37220
Vie RefWorksiin
Title: Kinetic models for supercritical fluid extraction and supercritical fluid extraction of lipids from microalgae
Author: Luukkainen, Jenni
Contributor: Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Kemian laitos
Thesis level:
Abstract: The interest, in using supercritical fluids as a replacement for conventional liquid solvents have
increased because of the need to reduce the use of organic solvents. Supercritical fluid extraction has
been studied as an alternative method for conventional extraction methods with organic solvents and
carbon dioxide has been the choice for the fluid in most of the applications. The use of supercritical
carbon dioxide has many advantages compared to organic solvents. The advantages are, for example that
CO2 is environmentally friendly and non-toxic solvent.
Modelling of supercritical fluid extraction processes is an important way to gain more valuable
information of the extraction process. Using tmathematical models, the extractions can be made more
efficient and be better designed. In this thesis broken plus intact cells, and shrinking core models are
being reviewed. Also combined broken and intact cells plus shrinking core model and some other kinetic
models are reviewed.
In the experimental part, the aim was to find out the best pre-treatment method for the microalgae
Scenedesmus, to determine the total lipid content, and to tentatively estimate the ability to use this
microalgae for biodiesel production . The extraction method used was supercritical carbon dioxide
extraction. The best lipid yield achieved was 11.5 % of dry weight. This yield was achieved by using
grinding in mortar combined with methanol as a pre-treatment technique. In the extraction methanol and
water were used with CO2 as co-solvents. Based on this research, the microalgae Scenedesmus is not
suitable for biodiesel production.
Description: Vain tiivistelmä. Opinnäytteiden arkistokappaleet ovat luettavissa Helsingin yliopiston kirjastossa. Hae HELKA-tietokannasta (http://www.helsinki.fi/helka/index.htm).Abstract only. The paper copy of the whole thesis is available for reading room use at the Helsinki University Library. Search HELKA online catalog (http://www.helsinki.fi/helka/index.htm).Endast avhandlingens sammandrag. Pappersexemplaret av hela avhandlingen finns för läsesalsbruk i Helsingfors universitets bibliotek. Sök i HELKA-databasen (http://www.helsinki.fi/helka/index.htm).
URI: http://hdl.handle.net/10138/37220
Date: 2012-10-12
This item appears in the following Collection(s)

Show full item record

Search Helda


Advanced Search

Browse

My Account