Results 251 to 260 of about 288,332 (292)

Soil Microbial Degradation of Vacuum Residue

Petroleum Science and Technology, 2012
Abstract The effect of microbial consortia on the alteration of petroleum residual structure and portions was studied, which can propose an alternative or complementary method for stringent upgrading heavy crude oil methods, which consist of heavy and complex hydrocarbons.
M. S. Tabatabaee, M. A. Assadi, M. Heydarian, A. A. Sepahi   +3 more
openaire   +1 more source

Hydroconversion kinetics of Marlim vacuum residue

Catalysis Today, 2005
Abstract A kinetic model was obtained for the Marlim crude vacuum residue (VR) hydroconversion. Marlim VR mixed with FCC decant oil in an 80%/20% weight basis was put in contact with a commercial NiMo on γ-alumina catalyst in a stirred batch reactor. Several temperatures and oil/catalyst ratios were used over different times (0–240 min), at a 110 bar
Rafael Menegassi de Almeida, Reginaldo Guirardello   +1 more
openaire   +1 more source

Residual vacuum in evacuated solar collectors

Vacuum, 1987
Abstract This work studies the residual vacuum and the gases desorbed within an evacuated solar collector after several working cycles at a solar station. The residual gases are also studied as a function of continuous pumping action.
JP Adrados, JL de Segovia, A Moscat
openaire   +1 more source

COMPOSITIONAL ANALYSIS OF A VACUUM RESIDUE

Fuel Science and Technology International, 1994
ABSTRACT A sample of vacuum residue (VR) was evaluated for its physical and chemical properties. The VR was separated into sixteen fractions according to molecular size distribution on preparative gel permeation chromatography (GPC) columns. Elemental analysis including heteroatoms (N, S) and metal (Ni, V) was carried out on fractions 1 through 9 ...
Zahida H. Khan, Sawson H. Al-Assi, Hanan A. Madouh, Eiman Al-Mubircb   +3 more
openaire   +1 more source

Upgrading of Mumbai High vacuum residue

Petroleum Science and Technology, 2019
Upgrading of waxy Mumbai High vacuum residue was carried out at four different temperatures, viz. 430, 445, 460, and 475 °C in an autoclavable reactor.
openaire   +1 more source

Catalytic hydroconversion of dagang vacuum residue

2011 International Conference on Remote Sensing, Environment and Transportation Engineering, 2011
The petroleum ether-insoluble fraction of Dagang vacuum residue (DVR-PEIF) was subject to catalytic hydrogenation in the presence of activated carbon (AC) under initial hydrogen pressure of 5 MPa at 300 °C. Most of compounds detected with GC/MS in the PE-soluble fraction of products from DVR-PEIF are aliphatic species, including normal chain alkanes ...
Li Han, Zhimin Zong, Xianyong Wei
openaire   +1 more source

Hydrogen donor visbreaking of Venezuelan vacuum residue

Journal of Fuel Chemistry and Technology, 2012
Abstract Hydrogen donor visbreaking and conventional visbreaking processes of vacuum residue of Venezuelan synthetic crude oil were investigated in an autoclave. Phase changes of the two reaction systems were observed by a microscope during the thermal conversion.
Qi WANG, Lei GUO, Zong-xian WANG, Bao-quan MU, Ai-jun GUO, He LIU   +5 more
openaire   +1 more source

Hydrocracking of vacuum residue by homogeneous catalysis

Fuel, 2014
Abstract The heterogeneous catalytic hydrocracking process of residues convert heavy hydrocarbons, including asphaltenes into light distillates, removes sulfur and nitrogen, saturates aromatics and olefins and retains heavy metals (Ni, V, Fe, Cu, etc.).
E. Mar Juárez, F.J. Ortega García, P. Schacht Hernández   +2 more
openaire   +1 more source

Quantitative analysis of vacuum residue in heavy oils using vacuum thermogravimetry.

Journal of The Japan Petroleum Institute, 1991
減圧蒸留残さを含む重質油は, 高温で熱分解または炭化するために熱重量法による沸点分布の測定が困難であるとされてきた。しかし, 減圧下で熱重量減少曲線を測定することで測定温度を低下させ, これらの影響を排除し, 重質油の沸点分布だけでなく, 減圧蒸留残さの定量が可能であることを示した。また, 減圧下での測定温度を常圧での沸点に換算するために, n-パラフィンを基準とした検量線を使用することが適当であることを示した。
Atsushi INABA, Tohru KAMO, Keiji MIKI, Yoshiki SATO   +3 more
openaire   +1 more source

Solubility Modeling of Athabasca Vacuum Residue

2010
The solubility parameters for ten fractions of Athabasca vacuum residue were calculated from molecular representations via group additivity methods. Two methods were used; Marrero-Gani and Fedors. The calculated parameters were compared between the fractions for consistency, and also compared with other literature sources.
openaire   +1 more source