Scale-up synthesis of lipase-catalyzed palm esters in stirred-tank reactor
2008
Keng, P.S. | Basri, M. | Ariff, A.B. | Abdul Rahman, M.B. | Abdul Rahman, R.N.Z. | Salleh, A.B.
Lipase-catalyzed production of palm esters by alcoholysis of palm oil with oleyl alcohol in n-hexane was performed in 2L 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 250rpm 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 (τ) and shear rate (dυ/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 15cycles of reaction. The process was successfully scale-up to 75L STR (50L working volume) based on a constant impeller tip speed approach, which gave the yield of 97.2% after 5h reaction time.
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