CO2 kao otapalo za prirodne pesticide

undergraduate thesis

• Title (english): CO2 as a solvent for natural pesticides
• Author: Rea Veseli
• Mentor: Marko Rogošić (mentor)
• Committee member: Marko Rogošić (predsjednik povjerenstva)
• Committee member: Aleksandra Sander (član povjerenstva)
• Committee member: Jasna Prlić Kardum (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-09-17, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Mechanical, Thermal and Separation Processes

Abstract

U ovom su radu procijenjene topljivosti prirodnih pesticida – složenih organskih spojeva
(triterpenoidi azadirahtin, nimbin i salanin dobiveni iz nima te piretrini piretrin I i II, cinerin I
i II i jasmolin I i II dobiveni iz cvjetova različitih vrsti krizantema) – u smjesama nadkritičnog
CO2 i etanola. Potrebni parametri za procjenu topljivosti dobiveni su raspoloživim
empirijskim metodama, odnosno Peng-Robinsonovom jednadžbom stanja. Ravnotežni tlakovi
sublimacije procijenjeni različitim metodama međusobno nisu slagali i za po nekoliko redova
veličine, što je uvelike ograničavalo pouzdanost procjena topljivosti. Proračun topljivosti
stoga je ograničen samo na nimbin – rezultati su pokazali da se najveća topljivost može
očekivati pri nižim temperaturama i srednjim tlakovima, te da povećanje udjela etanola u
smjesi s nadkritičnim CO2 povećava njegovu topljivost.

Abstract (english)

In this paper the solubilities of natural pesticides – complex organic compounds (triterpenoids
azadirachtin, nimbin and salanin derived from neem seeds and pyrethrins pyrethrin I and II,
cinnerin I and II and jasmolin I and II obtained from the flowers of various chrysanthemum
species) – in the mixtures of supercritical CO2 and ethanol were estimated. The required
parameters for assessing the solubility were obtained by available empirical methods as well
as with the Peng-Robinson equation of state. The sublimation pressures of pure solids
estimated with different methods were not coherent and differed by several orders of
magnitude, which greatly limited the reliability of obtained estimates. Therefore only the
solubility of nimbin was calculated – the results showed that the largest solubility may be
expected at lower temperatures and medium pressures; the increase of ethanol content in the
mixture with CO2 was found to increase the solubility.

• Keywords: ekstrakcija nadkritičnim CO2; Jobackova metoda; ravnoteža krutina - nadkritični fluid; triterpenoidi; piretrini
• Keywords (english): supercritical CO2 extraction; Joback method; solid - supercritical fluid equilibrium; triterpenoids; pyrethrins
• Language: croatian
• URN:NBN: urn:nbn:hr:149:034322
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Environmental chemistry and green technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-11-28 14:56:08