Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal Scientific Contributions Oil and Gas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI (LPMGB)
Devitra Saka Rani
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Energy

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
Dilute Acid Pretreatment And Enzymatic Hydrolysis Of Lignocellulosic Biomass For Butanol Production As Biofuel Devitra Saka Rani; Cut Nanda Sari
Scientific Contributions Oil and Gas Vol 35 No 1 (2012)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.35.1.776

Abstract

Biobutanol is one of the promising biofuel for substituting gasoline. Biobutanol produced from biomass fermentation using solventogenic clostridia which are able to convert a wide range of carbon sources to fuels such as butanol. Therefore, lignocellosic biomass has great potential as fermentation substrate for biobutanol production. Lignocellosic biomass should be hydrolized before fermentation by a pretreatment process and enzymatic hydrolysis. The various lignocellulosic biomass pretreatment will infl uence in butanol production depending on fermentable sugars content. The objective of this research is to get potential lignocellulosic biomass using dilute acid pretreatment and enzymatic hydrolysis process for biobutanol production. Eight types of biomass from sugarcane bagasse, rice straw, rice husk, empty fruit bunch (EFB) of palm oil, corn cob, pulp waste, traditional market organic waste, and microalgae were used in this experiment. After hydrolysis, the high result of total fermentable sugars in corn cobs, bagasse, rice straw, and rice husk, shows good opportunity of these biomass to be used as fermentation feedstocks for biobutanol production. In addition, pulp waste, organic waste, and microalgae are prospective as raw material but require more appropriate treatment either for to break down the cellulose/hemicellulose or to enhance reducing sugar content. Fine milling and delignifi cation have no signifi cant effect on cellulosic biomass conversion into fermentable sugars. Therefore, the production cost can be reduced. In order to enhance the sugar content and reduce the formation of inhibitor product, it is necessary to examine dilute acid pretreatment variations and appropriate operating conditions of enzymatic hydrolysis process
Stone Mineral Salt Solution As A Potential Nutrient For Biosurfactant And Biosolvent Production On Meor Application Devitra Saka Rani; Sri Kadarwati
Scientific Contributions Oil and Gas Vol 32 No 1 (2009)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.32.1.831

Abstract

Bioproduct from microbial enzymatic activities such as biosurfactant, bioacid, biosolvent, and biopolimer is a useful product in improving oil recovery. The nutrient factors such as the difference and variation of the nutrient, influence microbial growth and enzymatic activities. The objective of this study is to examine the feasibility of Stone Medium Salt Solution (SMSS) as a potential nutrient for biosurfactant and biosolvent production on MEOR application. In the tube test, microbial mixed culture and 3 asphaltic crude oils, tested as C1, C2, and C3, were examined in 0%, 25%, 75%, and 100% SMSS concentrations. The microbial activities were determined by pH, viscosity, and interfacial tension measurements under microaerophilic and aerophilic conditions at 0-day and 7-day incubations. The Microbial Core Flooding (MCF) experiment was measured to observe in field application. The microbial consortia in all crudes had good growth using 100 % SMSS medium. After 7 days, the population increased in both microaerophilic and aerophilic conditions. The interfacial tension and viscosity of all crudes decreased except the viscosity of C1 in microaerophilic condition. The highest decrease occurred in C2 crude, which reduced 51% of interfacial tension and 58.73% of viscosity. Although the result of MCF experiment showed insignificant recovery (only 1.63% from Original Oil in Place), this study proves that SMSS nutrient can be applied in MEOR research by ex situ biosurfactant and biosolvent production for enhancing oil recovery.
Surfactant Utilization In Oil Sludge Biode Gradation Using Slurry Bioreactor Syafrizal Syafrizal; Devitra Saka Rani; Yanni Kussuryani
Scientific Contributions Oil and Gas Vol 32 No 3 (2009)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.32.3.851

Abstract

Oil sludge from petroleum industry effluent is classified as hazardous waste and requiredspecial treatment before discharge to the environment. Biodegradation using bacterialactivities is a general treatment for oil sludge processing. However, the bacterial abilityin oil sludge biodegradation is blocked by non-aqueous phase liquid of oil sludge. Twopossible ways of enhancing the bioavailability of oil sludge are surfactants application and slurry bioreactors system. The objective of this study is to obtain the surfactant which can increase oil sludge biodegradation using simple slurry bioreactor. The surfactant selection obtained Emulsogen LP (58% effectiveness) which was examined based on HLB value, nonionic character, and surfactant effectiveness. Emulsogen LP is readily biodegradable which reached 93% biodegradability in 15 days. The biodegradation test showed that Emulsogen LP addition on its Critical Micelle Concentration (10 mg/L) enhanced oil sludge biodegradation in 3 bacterial cultures of Pseudomonas aeruginosa, Bacillus subtilis, and Actinobacter baumanni after 48 hours. By surfactant addition, oil sludge biodegradation reached 37-49% whereas without surfactant addition it only reached 28-33%. The highest oil sludge biodegradation was obtained in P. aeruginosa cultures with Emulsogen LP addition (49%). The surfactant addition had no effect on microbial growth. Moreover, P. aeruginosa population was increased by surfactant addition.
PRODUKSI BIOBUTANOL SEBAGAI BAHAN BAKAR TERBARUKAN MELALUI PROSES FERMENTASI Yanni Kussuryani; Devitra Saka Rani
Lembaran publikasi minyak dan gas bumi Vol 49 No 2 (2015)
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/LPMGB.49.2.1193

Abstract

Selama ini, proses Hydrodesulphurization (HDS) sebagai unit pengurangan kadar sulfur yangada di kilang belum mampu menghilangkan sulfur bermolekul besar seperti diBenzothiophenedan derivatifnya seperti 4,6-dimethydiBenzothiophene (4,6-DMDBT). Pada penelitian ini, prosesdesulfurisasi secara oksidatif (oxidative desulphurization, ODS) dengan menggunakan katalis TiMCM-41C dan Ti-MCM-41S dipelajari untuk menurunkan kandungan sulfur pada proses pembuatanBBM. Penelitian ini terdiri dari beberapa tahapan, yaitu pembuatan katalis, karakterisasi katalis,uji coba proses ODS skala laboratorium dan analisis produk proses ODS. Hasil Uji BET SurfaceArea menunjukkan bahwa katalis Ti-MCM-41C dan Ti-MCM-41S memiliki diameter pori ratarata 27.92 Ã… dan 27.10 Ã… sehingga telah memenuhi spesififi kasi sebagai katalis mesopori. Kinerjakedua katalis dalam proses ODS skala laboratorium cukup tinggi dilihat dari terjadinya penurunankandungan senyawa sulfur yakni sebesar 83.98% dengan menggunakan Ti-MCM-41C dan 89.82%untuk Ti-MCM-41S
Co-Authors Abdul Haris Cut Nanda Sar CUT NANDA SARI Dwi Supriningsih Efa Yenti Gitta Prawidia Ida Ayu Putu Sri Widnyani Jayawarsa, A.A. Ketut LENI HERLINA Roza Adriany Rudi Suhartono Sri Kadarwati Syafrizal Syafrizal Yanni Kussuryani