| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document Help

Title:ENCIMSKA ESTERIFIKACIJA MLEČNE KISLINE V IONSKIH TOPILIH PRI KONVENCIONALNIH IN NEKONVENCIONALNIH POGOJIH
Authors:ID Dobaj, Andreja (Author)
ID Leitgeb, Maja (Mentor) More about this mentor... New window
ID Primožič, Mateja (Comentor)
Files:.pdf UNI_Dobaj_Andreja_2010.pdf (649,63 KB)
MD5: 2494F18154E3D9A87C5BBE493DD9D553
PID: 20.500.12556/dkum/44a5b8f6-1c2e-46ab-b21d-1ab0dff6fe24
 
Language:Slovenian
Work type:Undergraduate thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V diplomskem delu je opisana encimska esterifikacija v ionskih toplih pri kontrolirani vsebnosti vode pod konvencionalnimi pogoji (stresalni inkubator, tip GLF 3031) in nekonvencionalnimi pogoji (mikrovalovni sistem, model BenchMate ) segrevanja. Pri predhodno določeni reakcijski mešanici (etanol ali butanol, mlečna kislina, encim Candida antarctica lipaze B — CALB, ionska tekočina Cyphos 202 ali Cyphos 201) smo spreminjali dva procesna parametra, temperaturo in začetno vsebnost vode, tako da smo dobili najvišjo presnovo reakcije pri določen parametru. Na osnovi eksperimentalnih podatkov smo prišli do spoznanja, da je imelo mikrovalovno segrevanje precej bolj ugoden vpliv na encimsko esterifikacijo mlečne kisline in alkohola v ionski tekočini kot konvencionalno segrevanje. Ugotovili smo, da so mikrovalovni žarki povzročili hidrolizo laktilnega estra mlečne kisline (dimer mlečne kisline) med reakcijo, zato je bilo med reakcijo na razpolago več mlečne kisline, kar je posledično povzročilo tudi višje presnove reakcije. Dodajanje ali odvzemanje vode je znižalo presnovo reakcije pri optimalni temperaturi, T = 60ËšC.
Keywords:konvencionalni in nekonvencionalni način segrevanja, biokataliza v ionskih topilih, kontrolirana vsebnost vode, etilni in butilni ester mlečne kisline.
Place of publishing:Maribor
Publisher:[A. Dobaj]
Year of publishing:2010
PID:20.500.12556/DKUM-15343 New window
UDC:547.473:577.15(043.2)
COBISS.SI-ID:14996246 New window
NUK URN:URN:SI:UM:DK:E0QVZFGW
Publication date in DKUM:09.09.2010
Views:3205
Downloads:334
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
:
Copy citation
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share



Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Secondary language

Language:English
Title:ENZYMATIC ESTERIFICATION OF LACTIC ACID IN IONIC LIQUID UNDER CONVENTIONAL AND UNCONVENTIONAL CONDITIONS
Abstract:In this diploma work enzymatic esterification in ionic liquid at controlled water content under conventional conditions (shaking incubator, type GLF 3031) and unconventional conditions (microwave system, model BenchMate) of heating is described. The reaction mixture was previously determined (ethanol or buthanol, lactic acid, enzyme Candida antarctica lipase B-CALB, ionic liquid Cyphros 202 and Cyphros 201). We defined (determined) two process parameters, temperature and initial water content, that gave maximal yield in fixed parameter. From the experimental data we recognised, that microwave heating had better impact on enzymatic esterification with alcohol and lactic acid in ionic liquid at controlled water content in the comparison with conventional heating. We found out that microwave irradiation caused lactic ester hydrolysis (dymer of lactic acid) during reaction, thus more monomer of lactic acid were available and as a result we got higher reaction yields. Addition to or removal water from the reaction mixture cased lower reaction yields at optimal temperature, T = 60˚C.
Keywords:conventional and unconventional heating, biocatalysts in ionic liquid, controlled water content, ethyl and butyl lactic ester.


Comments

Leave comment

You must log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica