Acid-catalyzed preparation of furfural from bagasse pre-hydrolysate and its extractive separation
Bagasse hydrolytic liquid and residue were obtained through high temperature acid hydrolysis.Furfural was then prepared from deep acidolysis of bagasse hydrolytic liquid,and purified by organic solvent extraction,while pulp fiber was synthesized via sulfate cooking of bagasse hydrolytic residue.Bagasse and its hydrolysis residue were characterized by FTIR,XRD,SEM and TG.Xylose in hydrolysis solution and furfural in deep acid solution were quantitatively analyzed by UV-Vis absorption spectrum.The pre-hydrolysis conditions of bagasse and the organic solvent extraction conditions for furfural were investigated.The results showed that under the conditions of 160 ℃,liquid-solid ratio(mL∶g)6∶1,concentrated sulfuric acid 0.176％(based on the mass of bagasse,the same below),the mass concentration of xylose(41.72 g/L)in the hydrolysate reached the highest after 3 h of prehydrolysis reaction.The furfural mass concentration in the hydrolysate was up to 15.91 g/L and the furfural yield was up to 59.60％after deep acidolysis at 170 ℃ for 90 min.When the furfural in deep acid solution was extracted by mixed solvent of V(1,2-dichloroethane)∶V(n-butanol)=9∶1(the volume ratio of organic phase to aqueous phase was 2∶1),the partition coefficient of furfural was up to 7.62,and the extraction rate of furfural was up to 93.53％.a-Cellulose mass fraction in pulp was as high as 93.41％,and the length to diameter ratio of fiber was 29.9,and fine fibers accounted for 34.7％.
bagassefurfuralpre-hydrolysisdeep acidolysisorganic solvent extractioncatalysis and separation technology
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