Citation
Abstract
Lipase-catalyzed production of palm esters by alcoholysis of palm oil with oleyl alcohol in n-hexane was performed in 2 L stirred-tank reactor (STR). Investigation on the performance of reactor operation was carried out in batch mode STR with single impeller mounted on the centrally located shaft. Rushton turbine (RT) impellers provide the highest reaction yield (95.8%) at lower agitation speed as compared to AL-hydrofoil (AL-H) and 2-bladed elephant ear (EE) impellers. Homogenous enzyme particles suspension was obtained at 250 rpm by using RT impeller. At higher impeller speed, the shear effect on the enzyme particles caused by agitation has decreased the reaction performance. Palm esters reaction mixture in STR follows Newtons’ law due to the linear relation between the shear stress (s) and shear rate (dt/dy). High stability of Lipozyme RM IM was observed as shown by its ability to be repeatedly used to give high percentage yield (79%) of palm esters even after 15 cycles of reaction. The process was successfully scale-up to 75 L STR (50 L working volume) based on a constant impeller tip speed approach, which gave the yield of 97.2% after 5 h reaction time.
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Additional Metadata
| Item Type: | Article |
|---|---|
| Divisions: | Faculty of Science Faculty of Biotechnology and Biomolecular Sciences |
| DOI Number: | https://doi.org/10.1016/j.biortech.2007.12.049 |
| Publisher: | Elsevier |
| Keywords: | Palm esters; Stirred-tank reactor; Single impeller; Enzyme suspension; Operational stability |
| Depositing User: | Najwani Amir Sariffudin |
| Date Deposited: | 29 Apr 2010 10:23 |
| Last Modified: | 28 Sep 2016 02:15 |
| Altmetrics: | http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.biortech.2007.12.049 |
| URI: | http://psasir.upm.edu.my/id/eprint/5805 |
| Statistic Details: | View Download Statistic |
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