The performance of the silicalite-1 filled PDMS/PAN composite membrane during the long-term operation in continuous butanol production with fermentation–PV coupled process is shown in Fig. 4. It can be seen that both the total flux and separation factor were more or less constant, even though slight fluctuations occurred due to the variation of ABE concentration in the fermentation broth. The average total flux was 557 g/m2 h, while the average separation factors of acetone, butanol and ethanol were 39.4, 31.2 and 8.2, respectively. These data showed that the silicalite-1 filled PDMS/PAN membrane in continuous ABE fermentation– PV coupled process has an excellent stability. Again, this
confirmed that membrane fouling was negligible. Similar results were reported by Hecke et al. (2012) in butanol production by coupling pervaporation with a two-stage fermentor. They found that the average flux of the PDMS membrane remained at 367 g/m2 h and fouling was not observed during 475 h operation. As compared with other PV membranes reported in literature, (see Table 2), the relatively high flux and separation factor of the silicalite-1 filled
PDMS/PAN composite membrane could ensure efficient removal of butanol from the fermentation broth and high butanol concentration in the permeate. Moreover, when it was coupled with ABE fermentation, both the yield and productivity increased. Therefore, it can be concluded that utilization of pervaporation for in situ recovery of butanol produced from cassava could be an efficient and economical approach for butanol production.
The performance of the silicalite-1 filled PDMS/PAN composite membrane during the long-term operation in continuous butanol production with fermentation–PV coupled process is shown in Fig. 4. It can be seen that both the total flux and separation factor were more or less constant, even though slight fluctuations occurred due to the variation of ABE concentration in the fermentation broth. The average total flux was 557 g/m2 h, while the average separation factors of acetone, butanol and ethanol were 39.4, 31.2 and 8.2, respectively. These data showed that the silicalite-1 filled PDMS/PAN membrane in continuous ABE fermentation– PV coupled process has an excellent stability. Again, this
confirmed that membrane fouling was negligible. Similar results were reported by Hecke et al. (2012) in butanol production by coupling pervaporation with a two-stage fermentor. They found that the average flux of the PDMS membrane remained at 367 g/m2 h and fouling was not observed during 475 h operation. As compared with other PV membranes reported in literature, (see Table 2), the relatively high flux and separation factor of the silicalite-1 filled
PDMS/PAN composite membrane could ensure efficient removal of butanol from the fermentation broth and high butanol concentration in the permeate. Moreover, when it was coupled with ABE fermentation, both the yield and productivity increased. Therefore, it can be concluded that utilization of pervaporation for in situ recovery of butanol produced from cassava could be an efficient and economical approach for butanol production.
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