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All Journal Jurnal Rekayasa Proses Reaktor International Journal of Renewable Energy Development Eksergi: Chemical Engineering Journal Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences KOVALEN: Jurnal Riset Kimia Jurnal Fitofarmaka Indonesia Mesin Chemistry Indonesian Journal of Chemical Research CHEESA: Chemical Engineering Research Articles Jurnal Rekayasa Proses Jurnal Teknik Kimia Indonesia International Journal of Renewable Energy Development Jurnal Rekayasa Proses International Journal of Oil Palm

Johnner P Sitompul

Institut Teknologi Bandung

Author-ID : 337985

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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A Scaling-up Synthesis from Laboratory Scale to Pilot Scale and to near Commercial Scale for Paste-Glue Production Sitompul, Johnner P.; Lee, Hyung Woo; Kim, Yook Chan; Chang, Matthew W.
Journal of Engineering and Technological Sciences Vol 45, No 1 (2013)
Publisher : ITB Journal Publisher, LPPM ITB

This paper concerns on developing a synthesis method of paste-glue production for gummed tape using a corn-based starch as an alternative feedstock from laboratory-scale to pilot-scale and to near commercial scale. Basically, two methods of synthesis were developed to produce paste-glue in laboratory scale. Based on the two methods, we then scale-up the earlier laboratory scale data to pilot-scale and near commercial-scale for developing a large scale process production of paste-glue. Scaling up production from 1,000 ml reactor to 500 L pilot-scale reactor and 1,500 L near commercial scale reactor, we monitored pathway of temperature increase during reaction as well as adjustment of operating condition conducted for laboratory experimental data in order to produce a good quality of paste-glue. Some scaling up parameters have been found as well as critical parameters for a good product quality such as viscosity and ceiling temperature of the reaction which are very crucial in order to give optimum operating condition. We have selected synthesis method of paste-glue production and found the range of the parameters in order to produce a very good quality of paste-glue in pilot scale and near commercial scale.

Molecular Weight and Structural Properties of Biodegradable PLA Synthesized with Different Catalysts by Direct Melt Polycondensation Lee, Hyung Woo; Insyani, Rizki; Prasetyo, Daniel; Prajitno, Hermawan; Sitompul, Johnner P.
Journal of Engineering and Technological Sciences Vol 47, No 4 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

Production of biodegradable polylactic acidÂ (PLA)Â from biomassbased lactic acid is widely studied for substituting petro-based plasticsÂ or polymers. This study investigated PLA production from commercial lactic acid in a batch reactor by applying a direct melt polycondensation method with two kinds of catalyst,Â Î³-aluminium(III)Â oxideÂ (Î³-Al2O3) orÂ zinc oxide (ZnO),Â in reduced pressure. The molecular weight of the synthesized PLA was determined by capillary viscometry and its structural properties were analyzed by functional group analysis using FT-IR. The yields of polymer production with respect to the theoretical conversion were 47% for Î³-Al2O3 and 35% for ZnO. However, the PLA from ZnO had a higher molecular weight (150,600 g/mol) than that from Î³-Al2O3 (81,400 g/mol). The IR spectra of the synthesized PLA from both catalysts using polycondensation show the same behavior of absorption peaks at wave numbers from 4,500 cm-1 to 500 cm-1, whereas the PLA produced by two other polymerization methods â polycondensation and ring opening polymerization âshowed a significant difference in % transmittance intensity pattern as well as peak area absorption at a wave number of 3,500 cm-1 as âOH vibration peak and at 1,750 cm-1 as âC=O carbonyl vibrational peak.

Production of Methyl Laurate from Coconut Cream through Fractionation of Methyl Ester Sitompul, Johnner P.; Istyami, A.N.; Muhtadi, R.; Lee, H.W.; Rahman, H.
Journal of Engineering and Technological Sciences Vol 47, No 5 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

This paper concerns the production of methyl laurate from coconut cream through fractionation of methyl esters. Coconut oil was produced by wet processing of coconut cream. The esters were prepared by reacting coconut oil and methanol using homogeneous catalyst KOH in a batch reactor, followed by fractionation of fatty acid methyl esters (FAME) at various reduced pressures applying differential batch vacuum distillation. Experimental data were compared with simulation of a batch distillation employing the simple Raoultâs model and modified Raoultâs model of phase equilibria. Activity coefficients (Î³i) were determined by optimization to refine the models. The modified Raultâs model with activity coefficients gave better agreement with the experimental data, giving the value of Î³i between 0,56-0,73. For a given boiling temperature, lower operating pressure produced higher purity of C10 and C12 FAME for respective distillates.

Improvement of Properties of Poly(L-lactic acid) through Solution Blending of Biodegradable Polymers Sitompul, Johnner; Insyani, Rizky; Prasetyo, Daniel; Prajitno, Hermawan; Lee, Hyung Woo
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

This study concerns the improvement and enhancement of the properties of poly(l-lactic acid) (PLLA) through simple solution blending of pure PLLA with different kinds of biodegradable polymers. Synthesized PLLA was blended with synthesized poly(d,l-lactic acid) (PDLLA) or poly(ethylene glycol) (PEG) at various composition ratios in a solvent mixture of dichloromethane/ethanol at room temperature to produce dipolymer. The polymer-blend properties were analyzed using FTIR, DSC, UTM data and an enzymatic degradation test was conducted. It was found that PLLA blend films were obtained with limitation of the second polymer content up to 20% (w) through solvent casting. From the DSC data, two different melting temperature peaks showed that stereocomplex formation occurred during polymer precipitation for all PLLA/PDLLA blends, while only one single melting temperature peak appeared in the PLLA/PEG blend. Regarding the mechanical properties, the PLLA/PEG blend showed better performance with an improvement of the mechanical strength by around 11.18% and an improvement of the elongation at break by around 89% compared to pure PLLA. Furthermore, after the 48-hour enzymatic biodegradability test, the PLLA/PEG blends showed improvement of biodegradability with 21.88% of sample weight-loss compared to 2.53% for pure PLLA.

PEROLEHAN SILIKAT DARI ABU SEKAM PADI DALAM SPOUTED-BED: EFEK PERPINDAHAN MASSA Sitompul, Johnner P; Wanadri, Agus
Mesin Vol 11, No 2 (1996)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (428.644 KB)

A 5 cm diameter spouted-bed reactor has been applied for solid-liquid reaction, paddy ash and NaOH producing Na-silicate. Hydrodinamics of spouted-bed reactor was studied by using paddy ash-water system. Correlation for minimum superfisial spouting (Ums) was determined and follows the equation.Â ( in cgs unit)The spouted bed (SB) operates under transition regime i.e. Reynold number particle range 7-25 or Re number ï¬uid ranging from 19 to 254. The mass transfer is the controlling step for this system as for all solid-liquid reactions are very fast. So, a model of mass transfer has been derived and mass transfer correlation in SB follows equations Sh = 191,34 + 0,6325 Sc0.35 Re1.89 Above correlation shows high mass transfer at stagnant ï¬uid compared to other mass transfer correlations which is due to reacting system involved.Kata kunci : sunbungan adhesives, perfonnansi kekakuan. performansi perpindahan panas.

Synthesis of Structured Triglycerides Based on Canarium Oil for Food Application Sitompul, Johnner; Gusdinar, Tutus; Anggadiredja, Kusnandar; Rahman, Hamidah; Tursino, Tursino
Journal of Engineering and Technological Sciences Vol 50, No 1 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

This paper concerns the synthesis of structured triglycerides containing different proportions and positions from medium- (M) and long-chain (L) fatty acids on a glycerol backbone. Structured triglycerides of MLM type were synthesized by utilizing canarium oil and incorporating caprylic acid (C8:0) as a source for the medium chain (M) fatty acids. Synthesis was performed through a two-step enzymatic reaction, with ethanolysis as the first step and esterification as the second step. Both reactions use the sn-1,3 specific lipase as a catalyst, which has specific activity at positions sn-1 and sn-3 of the triglyceride structure. The results from high-performance liquid chromatography showed that the stereospecific distribution of fatty acids in the structured triglyceride was 29.52Â±0.59 and 44.28Â±0.88 mol% of caprylic acid in the positions of sn-1,2,3 and sn-1,3, respectively. Furthermore, analysis of the physicochemical properties of both the native canarium oil and the structured triglycerides using an independent-sample t-test at p < 0.05 indicated that the two samples were significantly different for saponification number, iodium number, and average molecular weight. The results of this study showed that canarium oil can be exploited as a starting material for functional food application.

The Effect of Nanocrystalline Cellulose (NCC) Filler on Polylactic Acid (PLA) Nanocomposite Properties Simangunsong, Daniel I.; Hutapea, Try H. A.; Lee, Hyung Woo; Ahn, Jung Oh; Sitompul, Johnner
Journal of Engineering and Technological Sciences Vol 50, No 4 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

This paper discusses the effect of nanocrystalline cellulose (NCC) when used as filler on polylactic acid (PLA)-based nanocomposites and on its mechanical properties and permeability. NCC was produced from commercial cellulose and another cellulose source, i.e. oil palm empty fruit bunch, by hydrolysis of microcrystalline cellulose with sulphuric acid and by oxidation with ammonium persulfate. The nanocomposites were made by adding nanocrystalline cellulose with varying compositions into PLA. A solvent casting method was used to produce a nanocomposite film with 5% v/v triacetin as a coupling agent. Both methods produced crystalline celluloses within the micro and nano range with mean particle size at 99.5 nm and 157.9 nm for the sulphuric acid hydrolysis and the ammonium persulfate oxidation method, respectively. The utilization of NCC as PLA composite filler increased the percentage of elongation at break with a highest percentage 19.02% for addition of 1% NCC filler. However, higher compositions of cellulosic filler resulted in a decreasing trend of tensile strength and elongation at break. Higher content of NCC filler in the PLA matrix increased the nanocompositeâs water vapor permeability.

Evaluation and Modification of Processes for Bioethanol Separation and Production P Sitompul, Johnner; Widayat, Widayat; H. Soerawidjaja, Tatang
International Journal of Renewable Energy Development Vol 1, No 1 (2012): February 2012
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.1.1.15-22

This paper concerns on process evaluation and modification for bioethanol separation and production by applying pinch technology. Further, the paper is also focused on obtaining a most energy-efficient process among several processes. Three basic process configurations of bioethanol separation and production were selected for this study. The three separations and production systems are Othmer process, Barbet process and a separation process that operates under vacuum condition. Basically, each process is combination of Danish Distilleries process with a separation system yielding 95% (v/v) bioethanol. The production capacity of the plant is estimated about 4 x 107 litre of bioethanol 95% (v/v) per year. The result of the studies shows that the most energy efficient process among the three processes evaluated is the Othmer process, followed by the Barbet process and the process involving vacuum operation. The evaluation also shows that further energy saving can be carried for Barbet and Othmer process configuration when ï„Tmin = 10oC for heat exchange possible.

KAJIAN KOMPOSISI KIMIA, NILAI NUTRISI, DAN ETNOFARMAKOLOGIS TANAMAN GENUS KENARI Hamidah Rahman Rahman; Kusnandar Anggadiredja; Tutus Gusdinar; Johnner P Sitompul; A R Ryadin
Jurnal Fitofarmaka Indonesia Vol 6, No 1 (2019): JURNAL FITOFARMAKA INDONESIA
Publisher : Faculty of Pharmacy, Universitas Muslim Indonesia

One species of canarium genus is Canarium indicum L which is an original plant from Indonesia. Utilization of some canarium nut species which spread around the world had been recognized, such as a source of nutritious food as well as its potency as raw material of medicine based on evidence-based scientific. In traditional medicine, was reported if canarium nut had been used for diabetes mellitus treatment, angina, hepatoprotective, anti-inflammatory, antirheumatic, expectorant, etc. This article aims to review the chemical composition, nutrient values, and potency of canarium nut as the raw material of medicine. Scientific data were obtained from online search results. From the searching was found that at least eight species of canarium nut reported which is related to chemical composition and its nutrition which also provide ethnopharmacological benefits. Overall results, all identified canarium nut species have a favorable chemical composition and nutritional values that can be utilized as functional, nutritional and medicinal food. Therefore, the result of this study also indicates if the canarium nut from Indonesia, C. indicum L., has not been thoroughly studied. That indicates by the lack of scientific paper which presented about C. indicum from Indonesia.

Biodegradasi anaerobik biomassa tanaman laut dan produksi biogas dalam digester skala mini-pilot Johnner P. Sitompul; Asep Bayu; Tatang H. Soerawidjaja; Hyung W. Lee
Jurnal Teknik Kimia Indonesia Vol 11, No 4 (2013)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2013.12.1.2

Marine vegetation anaerobic biodegradation and biogas production in a mini-pilot digesterThis paper describes the productivity of biogas from anaerobic biodegradation of macroalgae Ulva lactuca and Padina sp. Marine biomasses especially macroalgae contain less lignin, thus the anaerobic biodegradability of these biomasses was higher than terrestrial biomass. Banana stem waste was used as comparison for the feedstock. Initial inoculums were prepared from cow manure and water. The inoculums and substrates were fed into a mini-pilot digester, operating semi-continuously. Volume of biogas was measured daily while methane content was measured every 3 days using gas chromatograph. Biogas productivity from the mini-pilot digester for feedstock Padina sp., U. lactuca, and banana stem waste was 5.22, 4.88, and 3.06 L respectively, after 28 days operation, with methane content 64.85, 49.90, and 34.76 %-v/v, respectively. The study also shows that lignin content in Padina sp., U. lactuca, and banana stem waste were 5.12, 1.54, and 7.17 %-w respectively. In general, macroalgae have less lignin content and thus produce higher anaerobic biodegradability. The study shows that compounds in microalgae are more biodegradable and more hydrosoluble. Moreover, the experimental results also showed that gross heating value (HHV) of biogas from feedstock of Padina sp. was quite close to that of biogas from cow manure.Keywords: Macroalgae, Ulva lactuca, Padina sp., biogas, HHV Abstrak Biomassa tanaman laut, khususnya makroalga, memiliki kadar lignin rendah sehingga biodegradabilitas anaerobiknya lebih tinggi dibandingkan tanaman darat. Dalam penelitian ini, biodegradabilitas anaerobik makroalga Ulva lactuca dan Padina sp. dari perairan Indonesia ditentukan berdasarkan produktivitas biogas, yang terutama diukur dari kadar metana yang dihasilkan. Peralatan berskala mini-pilot dirancang dan dirakit untuk mengukur perolehan biogas dari biomassa tanaman laut tersebut. Inokulum awal diperoleh dari campuran kotoran sapi dengan air. Biomassa basah dan air dicampur dan dihaluskan untuk memperoleh suspensi substrat. Inokulum dan suspensi substrat diumpankan ke dalam digester skala mini-pilot berkapasitas 5 L yang beroperasi secara semikontinu. Volume biogas diukur setiap hari sedangkan kadar metana diukur setiap 3 hari dengan kromatografi gas. Batang pisang digunakan sebagai biomassa pembanding. Produktivitas biogas yang dihasilkan dari Padina sp., U. lactuca, serta batang pisang berturut-turut yaitu 5,22, 4,88, dan 3,06 L, dengan kadar metana sebesar 64,85, 49,90, dan 34,76 %-v/v. Kadar lignin pada biomassa berturut-turut sebesar 5,12, 1,54, dan 7,17 %-b. Secara umum, makroalga memiliki kadar lignin relatif rendah sehingga biodegradabilitas anaerobiknya tinggi. Biodegradabilitas anaerobik paling tinggi dari Padina sp. juga disebabkan tingginya kadar senyawa yang dapat larut dalam air dan terhidrolisis. Nilai kalor kasar (HHV) biogas Padina sp. mendekati biogas kotoran sapi.Kata kunci: makroalga, Ulva lactuca, Padina sp., biogas, HHV

Co-Authors . Widayat A.N. Istyami A.N. Istyami, A.N. A.R. Ryadin Agus Wanadri Agus Wanadri Ahn, Jung Oh Aini, Apsari Puspita Aldhita Graffi Nabila Ana Kemala Putri Jauhari Ana Kemala Putri Jauhari Angelica, Evelyn Annisa N. Shabrina Arry K. Rizky Asep Bayu Carolus Borromeus Rasrendra Carolus Borromeus Rasrendra Chrismono Himawan Daniel I. Simangunsong Daniel Prasetyo Daniel Prasetyo Daniel Prasetyo, Daniel Daru Setyawan Emanuella, Natasha Enny Nurmalasari Faiq I. Akhiroti Gun Gun Gumilar Gun Gun Gumilar Gusdinar, Tutus H. Rahman H.W. Lee H.W. Lee, H.W. Hamidah Rahman Hermawan Prajitno Hermawan Prajitno Hermawan Prajitno, Hermawan Hutapea, Try H. A. Hyung W. Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Indra G. Pasaribu Insyani, Rizky Jung Oh Ahn Kusnandar Anggadiredja Lee, Hyung Woo Lee, Hyung Woo Mario C. Gultom Martha Situ Situmorang Matthew W. Chang Matthew W. Chang Megawati Zunita Michael D.M. Sitompul Permata A. Priyadi Prajitno, Hermawan Prasetyo, Daniel R. Muhtadi R. Muhtadi, R. Rasrendra, Carolus Borromeus Retno G. Dewi Retno G. Dewi Riadi, Indra Rizki Insyani Rizki Insyani Rizki Insyani Rizky Insyani Simangunsong, Daniel I. Tatang H. Soerawidjaja Tatang H. Soerawidjaja Tatang H. Soerawidjaja Tatang Hernas Soerawidjaja Tika Paramitha Tirto Prakoso Try H. A. Hutapea Tursino, Tursino Tutus Gusdinar Tutus Gusdinar Vita Wonoputri Vita Wonoputri Wanadri, Agus Widayat Widayat Yook Chan Kim Yook Chan Kim Yosandi Calimanto Yosandi Calimanto

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