04750nas a2200253 a 450000500170000000800410001703500150005810000180007324501330009126000670022430000220029149000270031350001360034050200580047652035980053465000260413265000250415870000320418370000450421570000420426071000690430281000590437185600660443020260818095235.0171206s2011    th uu m rtt   0|  a1eng d  a.b121959841 aErmawan, Dede10aEffects of final bleaching stage using hydrogen peroxide (Eq.) and peracetic acid in the ECF bleaching of acacia DED kraft pulps  aPathum Thani, Thailand :bAsian Institute of Technology,c2011  a56 leaves :bill.1 aThesis ;vno. PP-11-07  aA thesis submitted in partial fulfillment of the re quirement for the   degree of Master of Science in   Pulp and Paper Technology   aThesis (M. Sc.) - Asian Institute of Technology, 2011  aEffects  of  final  bleaching  of  D 0 E OP D 1   acacia  kraft  pulp  using  various  bleaching  chemical such  as  chlorine  dioxide,  hydrogen  peroxide  and  per acetic  acid  (eq.)  had  been  studied  in  laboratory  scale.  Raw  material  used  D 0 EOP  pulp  was  taken  from  fiber  line  1  of  PT.  Riau  Andalan  Pulp  and  Paper,  Indonesia.  D 0 EOP  pulp  was  bleached  by  D 1  stage  in  specific  condition  to  obtain  optimal  chemical  charge  to  prod uce  three  kinds  of  specific  brightness  pulps namely 85, 87, 89% ISO. Henceforth, these pul ps will be referred to A pulp, B pulp,  and C Pulp respectively. Afterward, Each D 1  pulp was final bleached by chlorine dioxide,  hydrogen  peroxide,  and  peracetic  acid  (eq.)  in  spec ific  condition  to  obtain  optimal  chemical  charge  to  produce  90%  brightness  pulps.  La rger  amount  of  final  bleached  pulps  were  produced  for  chemical  analysis,  optical  and  ph ysical  properties.  Bleaching  filtrate  was  also  collected  to  perform  environmental  paramet er  analysis  such  as  COD  and  TSS.  Effect  of  beating  on  final  bleached  pulp  was  also  s tudied  by  applying  0,  2000,  and  4000  beating  revolution.  As  comparison,  mill  D 2   pulp  was  also  involved  in  all  stages  of  properties measurement.  In  bleaching  of  chlorine  dioxide  1  (D 1 ),  three  chemical  charges  had  been  obtained  to  produce  A,  B  and  C  pulps  those  are  respectively  1.5 ,  2.5  and  9  kg  active  chlorine/tp.  In  bleaching of  chlorine dioxide 2 (D 2 ), demand of chemical to achieve 90%  ISO brightness is  10,  9,  and  1.5  kg  active  chlorine/tp  respectivel y  for  A,  B  and  C  pulp.  Meanwhile,  demand of hydrogen peroxide charge is 6, 4 and 1.5  kg/tp. While, Demand of chemical in  PAA stage is unreachable target for A pulp, 2 kg/tp  for B pulp and <1 kg/tp for C pulp. In  the  end  of  PAA  bleaching,  residual  of  hydrogen  pero xide  can  be  found  in  considerable  amount  due  to  hydrogen  peroxide  is  inert  in  low  pH  and  temperature,  therefore,  it  can  be  extent utilized by adding more retention time and p H change to more alkaline condition, as  a result, demand of chemical in PAA/P to achieve br ightness target is 1.5 kg/tp and 1 kg/tp  for A and B pulp respectively.  Brightness reversions of  DPAA/P pulps are lower tha n DD,  DP or DPAA  pulps. There is  not  significant  effect  of  different  initial  D 1   pulp  brightness  on  fully  bleached  pulp  brightness reversion; average % reversion is -2.04% , -2.51%, -1.50%, -1.32%, and -1.62%  respectively for mill D 2,  DD, DP, DPAA/P, and DPAA pulps. Generally, there i s no major  different  on  strength  properties  and  fiber  morpholo gy   among  final   bleached  pulps.  However,  extractive  content  in  alkaline  conditioned   bleaching  decrease  significantly  compare  to  acidic  conditioned  bleaching,  as  a  resul ts,  DPAA/P  pulps  contain  the  lowest  extractive, while DD pulps contain the highest extr active. The average extractive content is  0.26%,  0.31%,  0.08%,  0.05%,  and  0.10%  respectively  for  Mill  D 2 ,  DP,  DPAA/P,  and  DPAA. Moreover, even though P stage contributes to  give higher COD and SS and D stage  gives also higher chloride and SS, but compare to BAT in bleaching it  was still acceptable.  In addition, preliminary study on cost based on che mical demand and price shows that DP  and  DPAA/P  stages  are  significantly  more  expensive,   while  cost  of  DPAA  maybe  of  interested when comparing with DD.    0aKraft pulping process 0aWood-pulpxBleaching1 aBasta, Jiri., echairperson1 aNazhad, Mousa M.,eExamination Committee1 aLehtinen, Esa,eExamination Committee2 aPT. Riau Andalan Pulp and Paper,  Indonesia, eScholarship donor2 aAsian Institute of Technology.tThesis ;vno. PP-11-07  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B03699