Chemical Mechanical Pulping Of Eucalyptus - Latest ...

1 Chemical Mechanical Pulping Of Eucalyptus - Latest development & comparison Dr. Eric C. Xu Andritz Pilot Plant and R&D Tech. Center Mechanical Pulping Systems Different Pulping Processes ( For Virgin Fibers). Mechanical Pulping o Stone Ground Wood (SGW, PGW ). o Refiner Mechanical Pulping (RMP, TMP). Chemical Mechanical Pulping (CMP). o Chemical Pretreatment + Refining Chemical Pulping o Kraft (sulfate). o Sulfite o Others Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 2. Why CMP For Hardwoods? (1). Small - large capacity (100 to >500 t/d). Lower capital/investment cost Higher return from wood resource (higher yield ). Hardwoods are easy to react with chemicals Hardwoods need Chemical treatment to develop strength Process is very flexible Flexible means it can use different raw materials and produce different products Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No.

2 3. Why CMP For Hardwoods?(2). HWD CMP have been used in many applications: o Printing/Writing coated papers supper calendared wood free grades o Paper Board o Tissue/fluff o Newsprint Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 4. CMP vs. CP from Aspen (pulp intrinsic property). 100. 90 CMP. Tensile Index (Nm/g). 80 CP. 70. 60. 50. 40. 30. 20. 10. 0. Handsheet Density (g/cm3). Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 5. CMP vs. CP from e. grandis (pulp intrinsic property). 90. 80 CMP. 70 CP. Tensile Index ( ). 60. 50. 40. 30. 20. 10. 0. Handsheet Density (g/cm3). Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 6. Synergy Between Aspen CMP and CP. PULP SAMPLE Aspen CP Aspen CMP Mixture PULP SAMPLE ID K1 K2 H1 H2 C1 C2.

3 (HB) (HT) 20%H1 20%H2. 80%K2 80%K2. FREENESS (CSF) 320 274 345 210 312 280. BULK (cm3/g) TENSILE INDEX ( ) %STRETCH (J/m2) % OPACITY SCATT. COEFF. (m2/kg) Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 7. Different CMP Technologies P-RC APMP. o alkaline peroxide treatment before and during refining o Latest & most advanced technology BCTMP (sulfite). o sulfite pretreatment before refining + post bleaching o Old technology Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 8. comparison Between P-RC APMP & BCTMP. P-RC APMP: AP Chip Pri. Interstage Press Sec. Screening Pretreatment Refining HC Tower Washing Refining and (Atm. Inlet) Cleaning BCTMP: Sulfite Chip Press. Press. Screening AP Post Pretreatment Pri . Sec. and/or Bleaching Refining Refining Cleaning + Washing They use similar equipment and main chemicals (alkali + peroxide), but in different ways.

4 Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 9. Intrinsic Property: P-RC APMP pulps are better . 80. Aspen P-RC APMP. 70 Aspen BCTMP. Tensile Index ( ). Birch P-RC APMP. 60. Birch BCTMP. 50. 40. 30. 20. 10. 0. Handsheet Density (g/cm3). Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 10. Light Scattering: P-RC APMP pulps are higher . - all pulps at 300 mL CSF (from mixed NA HWD). 65. 60 P-RC APMP. BCTMP1. 55 BCTMP2. 50. LSC (m2/kg). 45. 40. 35. 30. 25. 20. 10 20 30 40 50 60. Tensile Index ( ). Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 11. Energy: P-RC APMP uses much less . 700. P-RC APMP (7%TA). 600 BCTMP (7%TA). CTMP ( ). CTMP ( pH 7). 500. CSF (mL). 400. 300. 200. 100. 0. SEC (kwh/odmt). Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No.

5 12. Chemical Consumption: P-RC APMP uses less . (birch from Europe). P-RC APMP BCTMP. % Total NaOH % H2O2 % Na2SO3 FREENESS (CSF, mL) 301 308 306 306. BULK (cm3/g) TENSILE INDEX ( ) %ISO BRIGHTNESS Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 13. Different CMP: P -RC APMP vs. BCTMP (HWD). Pulp Quality Strength: equal or higher Bulk: equal or higher LSC: same or better Bleachability: same or better Process Capital Cost: lower (no post bleaching). Energy: lower (normally by 30% or more). Chemical Cost: same or lower Yield: higher Effluent: easier to treat Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 14. Global Total APMP Design Capacity Total Designed Capacity (ADMT/Y x 1,000,000). 1998 2000 2002 2004 2006 2008 2010. Year Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No.

6 15. Example of P-RC APMP System (1). Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 16. Example of P-RC APMP System (2). Chip Washing Impregnation Stage Mainline Refining Bleaching & Washing From OPTION: Woodyard OPTION: Chip Washing System 1st Stage MC-Bleaching Dewatering Screw Chip Screw Press Pre-Steaming Bin Cyclone Impregnator with PSD. Hydra Chip Screen Reaction washer Bin MSD. Hydra Screen Chip Pump MC HC. Tower Tower Chip HC Mixer Pump Sump SEPF2. Washwater MC-Stock OPTION: MC-Stock SEPF1 Pump 1 Pump 1. Tank 1st Stage HC Refiner 1st Stage HC Refiner Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 17. P-RC APMP: pulp development Preconditioning Refiner Chemical treatment Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No.

7 18. Pulp Property development of Different Eucalyptus Woods From South America Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 19. e. grandis from different countries in FIGURE 9. TENSILE/DENSITY PROPERTIES. - E. Grandis 60 e. grandis from different ARGENTINA. 50. BRAZIL. countries were PARAGUAY. similar in tensile/density TENSILE INDEX (NM/g). 40 VENEZVELA. property 30 development 20. They all can develop high tensile strength 10. from HYP. 0. HANDSHEET DENSITY (g/cm3). Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 20. e. grandis from different countries in FIGURE 10. PROPERTIES. - E. Grandis 50. e. grandis from 45. ARGENTINA. different countries 40 BRAZIL. were mostly also PARAGUAY. similar in Tensile 35. VENEZVELA. Energy Absorption . 30 development (J/M2). 25 They all can develop high 20.

8 Properties from 15 HYP. 10. 5. 0. 0 10 20 30 40 50 60. TENSILE INDEX ( ). Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 21. Different Eucalyptus species from FIGURE 11. TENSILE/DENSITY PROPERTIES. - Different Eucalyptus e. grandis & e. saligna 70. were similar in tensile/density E. SALIGNA (P). 60 development . E. GRANDIS (B). E. PILULARIS (B) e. pilularis, e. dunny 50. E. DUNNII (B) and e. urophylla were TENSILE INDEX (N. M/g). E. UROPHYLLA (B). 40. similar in their tensile/density 30 development 20. They all can develop high tensile properties 10 from HYP. 0. & had better intrinsic HANDSHEET DENSITY (g/cm3) property than the others Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 22. Different Eucalyptus species from FIGURE 12. PROPERTIES. - Different Eucalyptus 70. They all seemed to 60 E.

9 Saligna (P) have similar E. Grandis (B) property development 50 E. Pilularis (B). E. Dunnii (B). They all can develop high properties (J/M2). 40 E. Urophylla (B). from HYP. 30. 20. 10. 0. 0 10 20 30 40 50 60 70. TENSILE INDEX ( ). Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 23. CMP vs. Chemical pulps from Eucalyptus 90. E. Saligna P-RC APMP. 80 E. Grandis P-RC APMP. E. Pilularis P-RC APMP. 70. E. Dunny P-RC APMP. Tensile Index ( ). 60 E. Urophylla P-RC APMP. Eucalyptus market Chemical pulps 50 CP from e. grandis 40. 30. 20. 10. 0. 0 Handsheet Density (g/cm3 ). CMP have lower density (higher bulk) at same tensile or higher tensile at same density or bulk Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 24. Eucalyptus HYP vs. aspen market BCTMP. 70. E. Saligna P -RC APMP.

10 60 E. Grandis P -RC APMP. E. Pilularis P -RC APMP. Tensile Index ( ). 50 E. Dunn ii P-RC APMP. E. Urophylla P -RC APMP. 40 NA aspen BCTMP market pulps NA maple BCTMP market pulps 30. 20. 10. 0. 0 Handsheet Density (g/cm3). Eucalyptus CMP have higher tensile at same density/bulk or higher bulk at same tensile than aspen market pulps Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No. 25. Eucalyptus vs. aspen printing/writing grades Table 1. Eucalyptus P-RC APMP versus Aspen BCTMP Market Pulps Wood Aspen South American Eucalyptus Process BCTMP P-RC APMP. Freeness (CSF) (ml) 110-350 110-350. Bulk (cm3/g) Density (g/cm3) Tensile Index ( ) 48-52 50 70-80 a Tear Index ( ) >7 a Burst Index ( ) > a Brightness (% ISO) 85 85 85 a Opacity (%) 76-77 80-85 75-80 b LSC (m2/kg) < 40 B >45 >40 b NOTE: a From extrapolation b Estimated numbers Eucalyptus gave better overall pulp handsheet properties Mechanical Pulping Systems My documents\Paper_1\Andritz conference\China_11-04\HYP\HYP of HWDs Slide No.