The effects of zeolite and silica gel in synthesis of amyl isobutyrate catalyzed by lipase from Candida rugosa
2008
Stojakovic, S.B., Institut za zastitu bilja i zivotnu sredinu, Beograd (Serbia) | Bezbradica, D.I., Univerzitet u Beogradu, Beograd (Serbia). Tehnolosko-metalurski fakultet | Mijin, D.Z., Univerzitet u Beogradu, Beograd (Serbia). Tehnolosko-metalurski fakultet | Knezevic, Z.D., Univerzitet u Beogradu, Beograd (Serbia). Tehnolosko-metalurski fakultet | Siler-Marinkovic, S.S., Univerzitet u Beogradu, Beograd (Serbia). Tehnolosko-metalurski fakultet
In our experimental work an attempt was made to regulate the activity of water by addition of water adsorbents in reaction mixture for synthesis of amyl isobutyrate. Two adsorbents were used: silica gel and molecular sieves (zeolites). The use of water adsorbents was optimized with respect to timing of adsorbent addition and pretreatment of adsorbent. The pretreatment of adsorbent with substrate did not increase the yield of ester. It was found that the timing of adsorbent addition is crucial factor. The addition in early phases of reaction leads to the decrease in ester yield compared to reaction without adsorbents. On the other hand, when the adsorbent was added in the late stage of reaction it exhibited beneficial influence on the yield of ester. The increase of yield was higher with silica gel (10%) than with molecular sieves (3.5%). These discrepancies can be ascribed to higher water adsorbing capacity of silica gel in systems with higher water content. Superior behaviour of silica gel in ester synthesis in conjugation with simple process of regeneration recommends the use of this adsorbent for increasing the yield of lipase-catalyzed ester synthesis.
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