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Jurnal Penelitian Hasil Hutan
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Search results for , issue " Vol 11, No 3 (1993): Jurnal Penelitian Hasil Hutan" : 2 Documents clear
STABILISASI DIMENSI PADA KAYU TANAMAN KARRI (EUCALYPTUS DIVERSICOLOR) DAN JARRAH (E. MARGINATA) BAGIAN I : ASETILASI Dimensional stabilization on regrowth karri (Eucalyptus diversicolor) and jarrah (E. Marginata) Part I : Acetylation Balfas, Jamal
Jurnal Penelitian Hasil Hutan Vol 11, No 3 (1993): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1397.699 KB) | DOI: 10.20886/jphh.1993.11.3.89-91

Abstract

Wood blocks of karri and jarrah  measuring 10 mm (radial) x 25 mm (longitudinal) x  100 mm (tangential) were ovendried for  48 hours at 105°C prior  to treatment.  Acetylation  was carried out in 250 ml- reactor  vessels using a 25  %  (v/v) solution of acetic anhydride in xylene.  Three reaction times, i.e., 8, 16 and 24 hours were used for  each wood type. Treatment results are expressed in terms  of weight gain (VG) and volumetric gain (VG). The ability  of treatment to restrict  dimensional changes is expressed as anti­ swelling efficiency (ASE). Results showed that the weight and volume of both eucalypts specimens substantially increased after acety- lation. In all cases, karri specimens showed higher weight gain, volumetric gain and ASE than jarrah.  The effectiveness of acetylation increased with increases in reaction time. Volumetric swelling reduction of more thaw 80% was found in the two regrowth eucalvots.
ISOLASI DAN SIFAT LIGNIN DARI LARUTAN SISA PEMASAK PABRIK PULP (Isolation and properties of lignin from black liquor of pulp industry) Nurhayati, Tjutju; Pasaribu, Ridwan Ahmad
Jurnal Penelitian Hasil Hutan Vol 11, No 3 (1993): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3547.205 KB) | DOI: 10.20886/jphh.1993.11.3.110-116

Abstract

the study is aimed to find the isolation techniques and properties al lignin component of black Liquors from pulp industry.The samples were taken from Basuki Rahmat pulp industry, namely black liquor of sulfate pulping from evaporator (with pH 13. 52) and from digester (pH 10.58), and from Basuki Teguh, namely neutral sulfite semi chemical pulping (pH 6.85). The isolation was conducted by using two kinds of acid i.e. sulphuric acid 2 N and chloric 2 N each at pH 3. and pH 5.The result revealed that the yield and quality of lignin isolated at pH 2 was higher than other pH levels. At this pH level, the lignin produced from sulfate pulping black liquor of exporator was 21.04%, and from digester was 7.47 %, and of neutral sulfide semi chemical pulping was 0.57%. the lignin properties of each black liquor were as the following : pure lignin content was 70.41 %, 72. 55 % and 68. 29 % , respectively ; methoxyl content was 5. 62 %, 11.17 % and 8. 95 % respectively, and particle surface area was 33.87 m3/g, 29.81 m2/g and 28.03 m2/g, respectively,Different from other lignin properties, highest acidity and water absorption capacity of lignin was produced by one which was isolated by chloric acid at pH level 5. the water absorption capacity and lignin acidity of sulfate pulping black liquor of evaporator was 122.45% and pH 6; and of digester was 119. 17 % and pH 6.03; and of neutral sulfide semi chemical pulping was 116.60 % and pH 5.53.

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