Abstract
AbstractLarge amounts of acidic waste are produced on the industrial scale during hydrolysis of partially amorphous cellulose to produce microcrystalline cellulose (MCC). The essential disposal and treatment of this highly acidic liquid wastes the acid feedstock and increases the production cost. To maximize the use of acid without sacrificing the MCC product quality, this project reports a successful attempt to recycle the acid hydrolysis waste liquid, focusing on the impact of waste recycling on MCC morphology and reducing sugar in the hydrolysate. The results showed that when the waste liquid is recycled 1-5 times, no metal accumulation occurred while cellulose particles remained intact, maintaining their shape and size. Their extent of crystallinity remained nearly constant, even increasing slightly with up to three cycles. The concentration of reducing sugar showed growth when recycling the waste liquid up to three times, although not quite to the levels that would allow for its cost-effective fermentation. The acid amount to be added at the start of each cycle was near 50% of that used on the first stage.
Highlights
IntroductionUniversity of Science & Technology, Xi’an 710021, Chbinraa; ,Shaacatninxig on acnomevpaolnueantitos.nAmdoidreuclted(siseceh[a5r,gPeroofptohsiistiwonas9t.e2]l)i.qTuhide teoxample (i) is Province Key Lab of Papermaking Technology and Speecxiaalmty ples (iii), (thive)eanrveirsopnemcieanltcwaoseusldorfe(svu)l.t in water and soil pollution, is se den Huijuan Xiu, National Experimental Teaching DemonsvtaraltuioensCoenfteAr. Fofracili≤ty.i T≤hids lterteavtimdeennt owteasateθsi-seiiggneinfivceacnttoramfooruAnt.sTohfe ordering {
For cellulose obtained by a single passage hydrolysis
The number of such floccules consistently decreased with waste liquid recycling, becoming significantly less abundant after five cycles
Summary
University of Science & Technology, Xi’an 710021, Chbinraa; ,Shaacatninxig on acnomevpaolnueantitos.nAmdoidreuclted(siseceh[a5r,gPeroofptohsiistiwonas9t.e2]l)i.qTuhide teoxample (i) is Province Key Lab of Papermaking Technology and Speecxiaalmty ples (iii), (thive)eanrveirsopnemcieanltcwaoseusldorfe(svu)l.t in water and soil pollution, is se den Huijuan Xiu, National Experimental Teaching DemonsvtaraltuioensCoenfteAr. Fofracili≤ty.i T≤hids lterteavtimdeennt owteasateθsi-seiiggneinfivceacnttoramfooruAnt.sTohfe ordering {. For Light Chemical Engineering, Shaanxi University owf Shciennceev&er A∗ acatcsidonanthde, abtasthise{svaim}die= tiimnea,ndiirsrceadrudscipboletetnritdiailalygounsaeflufal shion. National Experimental Teaching Demonstration Center for Light. If the waste liquid could be recycled, the Chemical Engineering, Shaanxi University of Science & Technology, environmental impact and acid usage and neutralization. Xi’an 710021, China costs would be reduced, with potential utilization of the Xuefei Zhang and Yun Ji, Department of Chemical Engineering, University of North Dakota, Grand Forks, ND 58202, U*SCAorresponding aAcuctuhmoru:lKataezdumsuagsaar.NSoamrmuraae: tToakl.yaopMpelideidcaal acnodmDbeinntaatlioUnniovfersity, Ichikaw.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
