04481ntm a2200325 i 4500003000800000005001700008006001900025008004100044020003200085040002300117100003400140245011200174264003400286264001200320300007000332336002100402336002100423337002500444337002300469338002300492338003000515347002400545500005900569502007000628504004000698520328700738610007404025650004504099650001104144MY-KuUP20251125105951.0t||||fr|||| 000 0 220311s2021    my a|||frm||| 000 0 eng d  aTHE0009152(Local)qhardback  aUMPbengcUMPerda1 aNur Hatipah Ibrahim,eauthor.10aDilute acid hydrolysis pretreatment process of meranti wood sawdust using aspen plus /cNur Hatipah Ibrahim 1aKuantan, Pahang :bUMP,c2021 4c© 2021  axv, 154 pages :billustrations (some color) ;c30 cm. +e1 CD-ROM  atext2rdacontent  atext2rdacontent  aunmediated2rdamedia  acomputer2rdamedia  avolume2rdacarrier  acomputer disc2rdacarrier  atext filebPDF2rda  aFaculty of Chemical and Process Engineering Technology  aThesis (Master of Science) -- Universiti Malaysia Pahang – 2021  aIncludes bibliographical references3 aThe  conversion  of  the  hemicellulose  and  cellulose  fractions  to  fermentable  sugar  hydrolysate is a crucial step for its use in various biochemical processes. The high yields  of end products, such as ethanol and xylitol, are highly dependent on the recovery of  intermediate products, such as xylose and glucose. The process models for dilute acid  hydrolysis have been extensively published in the literature to study the behaviour of the  process  based  on  stoichiometric  reaction  simulation.  However,  the  stoichiometric  reaction  failed  to  predict  the  operability  of  the  process  under  different  operational  conditions. To date, only a few studies have been conducted to simulate the kinetic-based  reaction of complete dilute acid hydrolysis using Aspen Plus. However, those studies used  different pretreatment operational conditions and raw materials to simulate the production  of intermediate products. In this study, a process model of dilute sulfuric acid hydrolysis  for xylose production was developed and simulated for comparison with experimental  results (Rafique and Sakinah, 2012). The process considered in this study consists of a  mixer, a heat exchanger, a continuous stirred tank reactor, a stoichiometric reactor, and a  solid-liquid separator. Detailed kinetic parameters and input data for each process unit  considered in this process were determined from the experimental study (Rafique and  Sakinah,  2012).  The  comparison  results  showed  the  percentage  differences  of  2.47%,  4.66%,  and  15.29%  for  xylose,  glucose,  and  furfural,  respectively.  The  process  parameters, such as temperature, reaction time, and acid concentration, were manipulated  and discussed in this study. The results from sensitivity analysis showed that the response  of  xylose,  glucose,  and  furfural  concentration  was  directly  influenced  by  those  three  parameters.  The  sensitivity  analysis  results  revealed  that  an  increase  in  acid  concentration, temperature, and reaction time increased the xylose, glucose, and furfural  concentrations. However, xylose concentration dropped remarkably a few minutes after  the reaction started. The maximum xylose concentration of 34.62 g/L was obtained at 160  °C, 2% H2SO4  concentration, and 20 min reaction time. On the other hand, the glucose  and  furfural  concentrations  increased  constantly  with  increased  acid  concentration,  temperature, and reaction time. The highest glucose and furfural concentrations of 35.28  and 14.63 g/L, respectively, were obtained at 140 °C, 6% H2SO4 concentration, and 160  min reaction time. The optimum conditions for maximum xylose and minimum furfural  concentrations were obtained at 150 °C, 4% H2SO4  concentration, and 40 min reaction  time  using  central  composite  design.  Based  on  the  obtained  results,  the  simulation  of  dilute acid hydrolysis of Meranti wood sawdust can be potentially used as an efficient  and  practical  tool  that  can  provide  insight  regarding  the  steady-state  operation  of  hydrolysis. The simulation process developed in this study can also be used as a basis to  develop  other  studies  related  to  the  controllability,  operability,  and  flexibility  of  this  process.20aFaculty of Chemical and Process Engineering TechnologyxDissertations 0aUniversities and collegesxDissertations 0aTheses