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William Costa e Silva,Heizir F. de Castro,Larissa F. Teixeira,Ana K.F. Carvalho,Adriano A. Mendes 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
A biodiesel process in a packed bed reactor was used as a model system to show the strong dependenceof the reactor behavior on the developing of chemical environment within the reactor. Ethanolysis runsof babassu and macaw palm oils were carried out in a solvent-free system using Burkholderia cepacialipase immobilized on silica–PVA matrix. The best performance was found for the reactor running onmacaw palm oil, which resulted in a stable operating system and an average yield of 87.6 ± 2.5%. Thisstrategy also gave high biocatalyst operational stability, revealing a half-life of 478 h.
Weriton R.R. Fidalgo,Annie Ceron,Larissa Freitas,Ju´ lio C. Santos,Heizir F. de Castro 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.38 No.-
The hydrodynamic characteristics and operational conditions to produce biodiesel by the ethanolysis ofbabassu oil catalyzed by immobilized lipase (Novozym1 435) were established in a fluidized bed reactorcoupling with a column to simultaneous remove glycerol formed as byproduct. Hydrodynamics wasdetermined by means of pulse tracer trials and results showed that the flow pattern can be described asan ideal continuous flow stirred tank. The best performance was obtained by running the reactor withbiocatalyst loading of 12% and a space–time of 8 h, attaining an average yield of 98.1% and productivity of9.9 molester/gcat/min.
Lucas S. Martin,Annie Ceron,Pedro C. Oliveira,Gisella M. Zanin,Heizir F. de Castro 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
Silica hybrid materials, functionalized via incorporation of three organic components: β-cyclodextrin (βCD), carboxymethyl-cellulose (CMC) and hydroxyethyl-cellulose (HEC) were synthesized by the sol–gel technique and results were compared to a well-defined matrix (silica–polyvinyl alcohol–SiO2–PVA) with respect to immobilizing Burkholderia cepacia lipase. The main objective was set to select organic components that can replace the PVA to obtain a hybrid composite with greater hydrophobic character, without compromising the remarkable features of SiO2–PVA. All the three selected compounds allowed obtaining matrices that presented similar textural and morphological properties and gave high activity (1451–1661 U g−1) and thermal stability (t1/2 > 70 h) upon immobilization. Regarding glycerol affinity, all matrices had lower ability than SiO2–PVA to adsorb glycerol, with the SiO2–βCD matrix showing the lowest affinity due to the cyclic structure of the βCD. Transesterification reactions of palm kernel oil with ethanol mediated by B. cepacia immobilized on SiO2–βCD performed in a packed bed reactor under continuous flow confirmed the efficiency of the SiO2–βCD matrix in increasing the operational stability of system, revealing a half-life (t1/2 = 1040 h), 2.5 times greater than that achieved in the same system using lipase immobilized on SiO2–PVA (t1/2 = 430 h).