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All Journal IPTEK The Journal for Technology and Science AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Petrogas : Journal of Energy and Technology Journal of Fundamentals and Applications of Chemical Engineering
Tri Widjaja
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science

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Ethanol Production from Molasses with Immobilized Cells Technique in Packed Bed Bioreactor by Extractive Musfil AS; Tri Widjaja; Ali Altway; R. Darmawan Darmawan
IPTEK The Journal for Technology and Science Vol 21, No 1 (2010)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v21i1.26

Abstract

The aim of this research was to study the effect of total sugar concentration, Ca-Alginate and K Carrageenan density in immobilized cells on packed-bed and batch bioreactor performance for ethanol production. In addition, this research was also aimed to study the effect of solvent flow rate on packed column performance expressed as % extraction recovery. This experiment was carried out with total sugar concentration of 10, 14, 18 % (v/v) and immobilized cells Ca-Alginate and K-Carrageenan at a density of 2% (w/v) with amyl alcohol as solvent. Based on the result of this study, it is concluded that the total sugar concentration influenced the concentration, yield and productivity of ethanol. The result of this study for immobilized Ca-Alginate cells showed that the maximum ethanol product concentration, yield and productivity were 7.28% g/l, 57.48 g/l, 38.22%, 71.85 g/l.hr, respectively. Meanwhile, immobilized K-Carrageenan cells showed the maximum ethanol product concentration, yield and productivity as 7.22% /56.99 g/l, 26.73%, and 68.40 g/l.hr, respectively. In extraction process, increasing amyl alcohol solvent flow rate will increase mass transfer and hence increase ethanol recovery.
PENGARUH TIPE PACKING DALAM ABSORPSI REAKTIF K2CO3 BERPROMOTOR DEA DALAM REACTOR PACKED COLUMN Junety Monde; Prapti Ira Kumala Sari; Karnila Willard; Tri Widjaja; Ali Altway
PETROGAS: Journal of Energy and Technology Vol 1, No 2 (2019): October
Publisher : Sekolah Tinggi Teknologi MIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58267/petrogas.v1i2.25

Abstract

Penyerapan secara kimia atau absorpsi reaktif yang paling banyak digunakan karena ketersediaan  tingkat removal yang lebih tinggi dibandingkan dengan metode penyerapan lainnya. Absorpsi reaktif dilakukan melalui menyerap CO2 dari gas oleh ikatan kovalen dalam molekul cairan penyerap. K2CO3merupakan salah satu absorben yang umum digunakan dalam penyerapan kimia tetapi laju absorsi lambat. Salah satu cara untuk meningkatkan penyerapan K2CO3 diantarnya dengan memperbaiki kualitas packing yang digunakan sehingga meningkatkan loading CO2. Pada penelitian ini akan membandingkan pengaruh penggunaan tipe packing raschig ring dan steel wool dalam pemisahan CO2  dan menggunakan promotor DEA dengan metode absorbsi reaktif dalam reactor packed kolom dengan variabel temperature (400C-800C), konsentrasi DEA(3)% dan laju alir absorben (0.5,0.75,1 L.min-1). Gas dialirkan dari bagian bawah packed kolom dan absorben dialirankan dari bagian atas sehingga terjadi aliran cuntercurren antar gas dan pelarut dalam packed kolom, CO2 akan larut dalam reaksi dengan laruan 30% K2CO3 dan DEA kemudian dilakukan pengujian terhadap jumlah CO2 yang terikat melalui analisa tittrasi. Hasil penelitian ini menunjukkan CO2 Loading dan % CO2 Removal meningkat menjadi 0.0722 dan 31.0728% dengan penggunaan packing steel wool jika dibandingkan dengan raschig rings CO2 Loading 0.0656  dan % Removal CO2 27.965% pada kondisi operasi yang sama yaitu 3% DEA, 1 L.min-1 dan temperature 700C.
Purification of lactic acid using alkaline precipitation followed by reactive distillation Tri Widjaja; Siti Nurchamidah; Ali Altway; Atha Pahlevi; Bayu Yusuf; Aisyah Alifatul
Journal of Fundamentals and Applications of Chemical Engineering Vol 4, No 1 (2023)
Publisher : Journal of Fundamentals and Applications of Chemical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2964710X.v4i1.14672

Abstract

Lactic acid (LA) can be applied commercially in the biodegradable polymer industry. The production of PLA biopolymers requires lactic acid with pure isomers as its raw material, therefore the process of producing lactic acid through biological fermentation pathways is preferred over through chemical synthesis processes that produce mixed (racemic) lactic acid. In general, lactic acid purification process is carried out by several methods including precipitation and distillation. Precipitation is a conventional method for separating fermented lactic acid which is carried out through 2 stages, namely neutralization and acidification. In the process of neutralizing the fermented solution, base is added to precipitate specific lactic acid and then an acidification process is carried out by adding acid to take back the precipitated lactic acid. Distillation of a raw fermented mixture can produce very pure LA. This is an effective method for separating LA from other organic acids. The reactive distillation process is a chemical process in which the chemical reaction and the distillation process are carried out in one unit. In reactive distillation, LA forms esters with alcohols in the presence of an acid catalyst. Esters have much lower boiling points than LA. Therefore, separation can be achieved by distillation. In this research, the lactic acid purification process was carried out by combining the precipitation process followed by the distillation process. The lactic acid solution obtained from the precipitation process is then mixed with ethanol and the catalyst is put into the batch distillation column system. Most of the ethanol and water come out as distillate while the residue is fed back into the distillation column system and aqueous lactic acid solution is added for the hydrolysis stage. The distillate products are ethanol and water, while lactic acid is obtained from the residue. In the esterification step, the concentration of ethyl lactate in the residue was measured, while in the hydraulic stage, the level of lactic acid in the residue was measured. In this study, the results of purification of lactic acid from the bases Ca(OH)2, NaOH, and KOH were obtained sequentially, including: 89.07%; 84.21; and 80.56%. The use of Ca(OH)2 base produces higher purity due to higher cation valence and low solubility formed between Ca(OH)2 and lactic acid so that the amount of lactic acid precipitated is greater than the other bases.
Electrospun PLA/Cellulose/Chitosan/PEG Nanofibers for Wound Dressing: Effects of Composition and Feed Rate Shofiyah; Syis Muhim; Muljani, Srie; Tri Widjaja; Rohmah, Aisyah Alifatul Zahidah; ari, Citra Yulia S
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 1 (2026)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v10i1.959

Abstract

This study presents the development of a biocompatible and biodegradable nanofiber-based wound dressing fabricated via electrospinning using a composite of polylactic acid (PLA), cellulose, chitosan, and polyethylene glycol (PEG). The novelty of this work lies in the systematic control of material composition and processing parameters, particularly the feed rate, to regulate fiber morphology and surface properties. The results demonstrate that the incorporation of PEG, cellulose, and chitosan influences the contact angle through intermolecular hydrogen bonding, without forming new chemical bonds, indicating that physical blending rather than chemical interactions govern the system. Furthermore, increasing the feed rate enhances polymer jet stretching, resulting in finer and more uniform nanofibers. The resulting nanofiber structure exhibits characteristics suitable for wound dressing applications, including improved interaction with aqueous environments and structural uniformity. Overall, this study provides insight into the relationship between material composition, processing conditions, and nanofiber formation mechanisms, contributing to the rational design of advanced biomaterials for biomedical applications. Contribution to Sustainable Development Goals (SDGs):SDG 3: Good Health and Well-beingSDG 9: Industry, Innovation and InfrastructureSDG 12: Responsible Consumption and ProductionSDG 13: Climate Action
Co-Authors Aisyah Alifatul Aisyah Alifatul Zahidah Rohmah Ali Altway ari, Citra Yulia S Atha Pahlevi Bayu Yusuf Karnila Willard Musfil AS Prapti Ira Kumala Sari R. Darmawan Darmawan Shofiyah Siti Nurchamidah SRIE MULJANI Syis Muhim