02053nas a2200193   4500008004100000245010100041210006900142260000800211300001400219490000700233520136200240100002001602700001801622700002001640700002101660700002301681700002801704856012701732       2016                        eng d00aEffect of mixed acid catalysis on pretreatment and enzymatic digestibility of sugar cane bagasse0 aEffect of mixed acid catalysis on pretreatment and enzymatic dig  cSEP  a7310-73180 v303 aAqueous pretreatment using homogeneous acid catalyst is considered as a low-cost technology in the production of lignocellulosic bioethanol. To establish the synergism of mixed acids, pilot-level aqueous pretreatments of bagasse covering a wide range of combined severity (CS) were carried out. To investigate the effect of application of mixture of acids on xylose hydrolysis as well as glucose hydrolysis via pretreatment and enzymatic hydrolysis, the following three combinations of acids were explored: (1) oxalic acid + sulfuric acid (organic + mineral acid), (2) phosphoric + sulfuric acid (mineral acids), and (3) ferric chloride + sulfuric acid (Lewis acid with a mineral acid). Of the pretreatments evaluated, the synergism was most pronounced for the combination of sulfuric and phosphoric acid, which resulted in more than 90% conversion of hemicellulose to xylose and 70% conversion of cellulose to glucose through enzymatic hydrolysis. Fourier transform infrared (FTIR) studies of pretreated samples showed higher syringyl/guaiacyl (S/G) ratio for sulfuric and phosphoric acid combination pretreatment, leading to higher enzymatic conversion. FTIR and dynamic light scattering (DLS) experiments conducted on pretreated sugar cane bagasse provided useful correlation with regard to the pretreatment type, particle size, and enzymatic hydrolysis.1 aPal, Siddhartha1 aJoy, Shereena1 aKumbhar, Pramod1 aTrimukhe, K., D.1 aVarma, Anjanikumar1 aPadmanabhan, Sasisanker  uhttps://library.ncl.res.in/content/effect-mixed-acid-catalysis-pretreatment-and-enzymatic-digestibility-sugar-cane-bagasse02927nas a2200265   4500008004100000022001400041245012800055210006900183260008000252300002400332490000600356520189500362653002602257653003602283653002902319653002402348653002802372100002002400700001802420700002602438700002402464700002202488700002802510856012302538       2016                        eng d  a2190-573800aPretreatment and enzymatic process modification strategies to improve efficiency of sugar production from sugarcane bagasse0 aPretreatment and enzymatic process modification strategies to im  aTIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANYbSPRINGER HEIDELBERGcJUN  aArticle Number: 1260 v63 a<p>Pretreatment and enzymatic hydrolysis play a critical role in the economic production of sugars and fuels from lignocellulosic biomass. In this study, we evaluated diverse pilot-scale pretreatments and different post-pretreatment strategies for the production of fermentable sugars from sugarcane bagasse. For the pretreatment of bagasse at pilot-scale level, steam explosion without catalyst and combination of sulfuric and oxalic acids at low and high loadings were used. Subsequently, to enhance the efficiency of enzymatic hydrolysis of the pretreated bagasse, three different post-pretreatment process schemes were investigated. In the first scheme (Scheme 1), enzymatic hydrolysis was conducted on the whole pretreated slurry, without treatments such as washing or solid-liquid separation. In the second scheme (Scheme 2), the pretreated slurry was first pressure filtered to yield a solid and liquid phase. Following filtration, the separated liquid phase was remixed with the solid wet cake to generate slurry, which was then subsequently used for enzymatic hydrolysis. In the third scheme (Scheme 3), the pretreated slurry was washed with more water and filtered to obtain a solid and liquid phase, in which only the former was subjected to enzymatic hydrolysis. A 10 % higher enzymatic conversion was obtained in Scheme 2 than Scheme 1, while Scheme 3 resulted in only a 5-7 % increase due to additional washing unit operation and solid-liquid separation. Dynamic light scattering experiments conducted on post-pretreated bagasse indicate decrease of particle size due to solid-liquid separation involving pressure filtration provided increased the yield of C6 sugars. It is anticipated that different process modification methods used in this study before the enzymatic hydrolysis step can make the overall cellulosic ethanol process effective and possibly cost effective.</p>10aDilute acid treatment10aHigh-solid enzymatic hydrolysis10aPilot-scale pretreatment10aPressure filtration10aSolid-liquid separation1 aPal, Siddhartha1 aJoy, Shereena1 aTrimukhe, Kalpana, D.1 aKumbhar, Pramod, S.1 aVarma, Anjani, J.1 aPadmanabhan, Sasisanker  uhttps://library.ncl.res.in/content/pretreatment-and-enzymatic-process-modification-strategies-improve-efficiency-sugar