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Abstract
Furfural is an important platform chemical with a wide range of applications. However, due to the low concentration of furfural in the hydrolysate, the conventional methods for furfural recovery are energy-intensive and environmentally unfriendly. Considering the disadvantages of pervaporation (PV) and distillation in furfural separation, a novel energy-efficient ‘green technique’, gas stripping assisted vapor permeation (GSVP), was introduced in this work. In this process, the polydimethylsiloxane (PDMS) membrane was prepared by employing water as solvent. Coking in pipe and membrane fouling was virtually non-existent in this new process. In addition, GSVP was found to achieve the highest pervaporation separation index of 216200 (permeate concentration of 71.1 wt% and furfural flux of 4.09 kgm−2h−1) so far, which was approximately 2.5 times higher than that found in pervaporation at 95°C for recovering 6.0 wt% furfural from water. Moreover, the evaporation energy required for GSVP decreased by 35% to 44% relative to that of PV process. Finally, GSVP also displayed more promising potential in industrial application than PV, especially when coupled with the hydrolysis process or fermentation in biorefinery industry.
Highlights
A novel method for furfural recovery via gas stripping assisted vapor permeation by a polydimethylsiloxane membrane
gas stripping assisted vapor permeation (GSVP) was found to achieve the highest pervaporation separation index of 216200 so far, which was approximately 2.5 times higher than that found in pervaporation at 956C for recovering 6.0 wt% furfural from water
The top layer is the PDMS layer, which plays the main role of separation in the process
Summary
A novel method for furfural recovery via gas stripping assisted vapor permeation by a polydimethylsiloxane membrane. Considering the disadvantages of pervaporation (PV) and distillation in furfural separation, a novel energy-efficient ‘green technique’, gas stripping assisted vapor permeation (GSVP), was introduced in this work. In this process, the polydimethylsiloxane (PDMS) membrane was prepared by employing water as solvent. The energy consumption of evaporation for pervaporation was at least 70% less than that for distillation All these studies were based on using furfural/water binary solution for separation; in the real reaction system during furfural production, there exists a high solid-to-liquid ratio (about 152 or 153) in the reaction solution. Potential of GSVP in practical application for furfural recovery was pointed out and analysed
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