Introduction Prosiding 2nd Reptech tahun 2016
ISBN : 978-602-17761-4-8
35
Proceedings of 2
nd
REPTech Crowne Plaza Hotel, Bandung, November 15-17, 2016
© 2016 Published by Center for Pulp and Paper through 2
nd
REPTech
ASSESSING THE ROLE OF RATIO OF SYRINGILVANILLIN-BASED LIGNIN MONOMERS, DENSITY OF FOUR PLANTATION-FOREST WOOD SPECIES, AND
H-FACTOR ON DELIGNIFICATION INTENSITY AND PROPERTIES OF KRAFT PULP
Dian Anggraini Indrawan
a 1
, Rossi Margareth Tampubolon
a
, Gustan Pari
a
, Saptadi Darmawan
b
, Han Roliadi
c 2
a
Center for Forest Product Research and Development, Bogor, Indonesia,
b
Center for The Technology of Non-Forest Product Research and Development, Mataram, Indonesia,
c
Already Retired,
1
elisabethdianrezagmail.com
2
hroliadiyahoo.com
ABSTRACT
Domestic consumption of pulp and its derivatives esp. paper during the last three years 2012-2014 steadily increased, and might be such in the future. Concerns arouse as the availability of conventional
iber sources natural-forest woods in Indonesia for pulppaper becomes depleted and scarce. One way to overcome is introducing alternative ibers, e.g. plantation-forest PF woods. Different PF-wood
species could affect pulping properties esp. deligniication extentintensity, and the resulting-pulp paper products. This can lead to ineficiency in utilizing and processing different wood species for
pulppaper; and therefore deserves thorough solution. Pulping with kraft process through ingenuously manipulating process condition indicatively could tolerate species differences. Basic properties of PF
woods should also be accounted e.g. density, lignin content, and ratio of syringil-to-vanillin units in lignin. Relevantly, laboratory-scale kraft pulping was conducted on individual PF species i.e. sengon,
gmelina, meranti kuning, and kapur employing ixed processingcooking conditions, i.e. 16-active alkali, 22.5-sulidity, and 1:4-wood-to-liquor ratio. Variable conditions were maximum cooking-
temperatures at 170
o
C and 190
o
C, each held for 0-, 30-, 60-, and 90-minute durations. Combination of cooking temperatures and durations brought-out eight H-factors values 117.88-2182.67 and accordingly
eight kraft-pulp varieties. Greater H-factor values induced more deligniication intensity. Deligniication intensity seemed more affected by ratio of syringilvanillin units R
2
=0.2026 than by wood density R
2
=0.2005 and lignin content R
2
=0.0688
ns
. Such intensity correlated positively with screened-pulp yield and negatively with pulp reject. The highest yield was achieved at H-factor 1502.25. As such,
kraft-pulp handheets were formed without beating, and their physicalstrength properties tested. Sheet properties correlated positively with syringilvanillin ratio, negatively with wood density less strongly,
but insigniicantly with lignin content. Overall, this implied greater syringilvanillin ratio apparently enhanced active-selective deligniication intensity, thereby lessening wood-carbohydrate degradation.
The besthighest sheet physicalstrength properties were from sengon wood, followed in decreasing order by gmelina, meranti kuning, and kapur. Meranti kuning and kapur which seemed unsatisfactory in
kraft pulping can expectedly be improved by enhancing active-selective cooking liquor e.g. regulating
sulidity and introducing AQ. These signiicant results seem prospectively beneicial to bring more eficient pulppaper processing from PF woods; and lessen dependency on natural-forest woods, thereby
mitigating forest-destruction intensity and sustaining natural resources.
Keywords: Lignin, siringil, vanilin, kraft, pulping