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Haznan Abimanyu
Research Center for Chemistry, Indonesian Institute of Sciences, Puspiptek, Serpong, Tangerang 15340, Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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STUDIES ON KINETICS OF DIMETHYL CARBONATE SYNTHESIS BY HOMOGENEOUS TRANSESTERIFICATION Haznan Abimanyu
Jurnal Kimia Terapan Indonesia Vol 11, No 2 (2009)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2510.684 KB) | DOI: 10.14203/jkti.v11i2.158

Abstract

A comprehensive kinetic study on dimethyl carbonate synthesis by transesterification of ethylene carbonate with methanol has been conducted. An alkali base metal (KOH) was used as catalyst in the synthesis of DMC and its catalytic ability was investigated in term of kinetics. The reaction orders, the activation energy and the rate constants were determined for both forward and backward reactions. The reaction is reversible and the equilibrium rate constant wasestimated to be 135.77exp(-16542.4/RT).Keywords : dimethyl carbonate synthesis, transesterification reaction, kinetic study on DMC synthesis
Optimasi Proses Perlakuan Awal NaOH Tandan Kosong Kelapa Sawit untuk menjadi Bioetanol Muryanto Muryanto; Yanni Sudiyani; Haznan Abimanyu
Jurnal Kimia Terapan Indonesia Vol 18, No 01 (2016)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v18i01.37

Abstract

Bioetanol dari bahan baku limbah lignoselulosa menjadi energi alternatifyang mulai dikembangkan. Perlakuan awal merupakan tahap awal dariproses konversi lignoselulosa menjadi bioetanol. Perlakuan awal kimiaNaOH dilakukan dengan memasukkan TKKS berukuran 3 mm dan larutanNaOH 10 % pada reaktor bersuhu sedang dan tekanan 4 bar. Pada penelitianakan diketahui pengaruh suhu dan waktu proses pada perlakuan awal TKKS.Variasi suhu proses dimulai dari suhu 140, 150 dan 160 ËšC, sedangkan variasiwaktu proses dimulai dari 20, 30 dan 40 menit. Hasil perolehan biomassatertinggi didapatkan pada proses perlakuan awal dengan suhu 140 ËšC, 20menit sebesar 42,83 % (basis berat kering), delignifikasi tertinggi pada suhu160 ËšC, 40 menit yaitu sebesar 86,92 %. Namun kondisi optimal perlakuanawal TKKS untuk menghasilkan bioetanol tertinggi diperoleh pada suhu 150ËšC, 30 menit yaitu perolehan biomassa sebesar 35,97 %, delignifikasi sebesar76,74 % dan yield etanol terhadap TKKS awal sebesar 15.17 % (b/b).
HIDROLISIS LIGNOSELULOSA PELEPAH DAN TANDAN KOSONG KELAPA SAWIT DENGAN KATALIS ZIRKONIA TERSULFATASI Anis Kristiani; Kiky Corneliasari Sembiring; Haznan Abimanyu; Fauzan Aulia
Jurnal Kimia Terapan Indonesia Vol 15, No 2 (2013)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2609.593 KB) | DOI: 10.14203/jkti.v15i2.112

Abstract

Lignocellulosic biomass which are frond and empty fruit bunches (EFB) is second generation raw material for ethanol production. Lignocellulose usage is expected to create a green process. Utilization of lignocellulose materials into ethanol involved four main processes, i.e pretreatment, hydrolysis/sacharification, fermentation, distillation and dehydration ethanol that was product. This research aims to optimize hydrolysis process of EFB and frond by using sulfated zirconia catalyst characterized its physical and chemical properties as a solid acid catalyst. Catalytic hydrolysis process conducted at 160 DCfor 3 hours gave the highest TRS (Total Reducing Sugar) which is 17,51 % for EFB while for frondfor 2 hours which is 19,23 % .Keyword: Hydrolysis, solid acid catalyst, lignocellulose, frond, EFB, sulfated zirconia
PREPARATION OF MgO-CeO2 MIXED OXIDE WITH IONIC LIQUID AS CATALYST FOR DIMETHYL CARBONATE SYNTHESIS VIA TRANSESTERIFICATION Haznan Abimanyu; Kye Sang Yoo; Byoung-Sung Ahn
Jurnal Kimia Terapan Indonesia Vol 12, No 2 (2010)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4088.324 KB) | DOI: 10.14203/jkti.v12i2.212

Abstract

The synthesis and application of dimethyl carbonate (DMC) are achieving increasing importance due to its low toxicity and versatile reactivity. The phosgenation-route has been losing attraction recently due to the use of virulent phosgene. In transesterification process, DMC is co-generated with ethylene glycol (EG). In this study, various ionic liquids were used as template in coprecipitation methods to prepare mesoporous MgO-CeO2 mixed oxides particles. Among the ionic liquids, [Bmim][BF6] displayed the best performance in terms of activity, while [Omim][PF6] obtained the best selectivity for this reaction. The addition of IL's in the coprecipitation method increased the surface areaand pore volume of the catalysts. Meanwhile, the crystallite size of the catalysts was reduced many times. However, there is no effect of the surface areaand particle size as well on the catalytic activity of the catalyst in this reaction. The activity and selectivity of the catalyst depend on the base strength distribution. The moderate basic site is responsible for the catalytic activity, while the selectivity is more dependableon the strong basic site. Keyword: preparation, MgO-CeO2, ionic liquid, dimethyl carbonate, coprecipitati
The Evaluation of Substrates and Trichoderma sp. Isolates for Cellulase Production Eka Triwahyuni; Yosi Aristiawan; Novita Ariani; Haznan Abimanyu; Trisanti Anindyawati
Jurnal Kimia Terapan Indonesia Vol 20, No 1 (2018)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (650.106 KB) | DOI: 10.14203/jkti.v20i1.384

Abstract

AbstractAs higher interest was on the lignocellulose-based or second generation bioethanol production, the research was then more focused on the production of cellulase, especially on the domestic enzyme. Trichoderma sp. is considered as one of the most efficient producer of cellulase. This study was conducted to investigate the performance of Trichoderma sp. on a variety of substrates to produce cellulase. Three types of substrate variations and three types of Trichoderma sp. were used in this experiment. The substrate used were wheat bran, rice bran and oil palm empty fruit bunches (EFBs), whereas Trichoderma sp. isolates were encoded as T004, T051 and T063. Production of cellulase was made by solid fermentation for 7 days. The analysis of cellulase activity was done by National Renewable Energy Laboratory (NREL) method for filter paper assay. The results showed that the type of substrate affected the performance of Trichoderma sp. All types of fungus produced cellulase on wheat bran substrate with activity of 0.52 FPU /ml for T004, 0.23 FPU/ml for T051 and 0.27 FPU /ml for T063. With the rice bran substrate and EFBs, only T004 could produce cellulase and the enzyme activity analyzed were 0.08 FPU /ml and 0.008 FPU/ml respectively. Optimation of the buffer addition on enzyme extraction process produces the highest activity 0.85 FPU/mL for T004 with wheat bran substrate. Keywords: cellulase, EFBs, rice bran , Trichoderma sp. , wheat bran
Co-Authors Anis Kristiani Byoung-Sung Ahn Eka Triwahyuni I Gusti Ngurah Antaryama Kiky Corneliasari Sembiring Kye Sang Yoo Muryanto Muryanto Muryanto Muryanto Novita Ariani Trisanti Anindyawati Yanni Sudiyani Yosi ARISTIAWAN