Results 261 to 270 of about 288,332 (292)

New catalyst for hydrocracking of vacuum residue

Applied Catalysis, 1989
Abstract Catalytic hydrocracking using five mineral clay catalysts and five fluid catalytic cracking catalysts was performed in an autoclave. Mineral clay catalysts have higher mid-distillate yields and lower coke plus gum (coke precursor) yields than fluid cracking catalysts.
Toshio Itoh, Yukihiro Tsuchida
openaire   +1 more source

Rapid hydrocarbon type separation of vacuum residues

Fresenius' Zeitschrift für analytische Chemie, 1988
A simple and fast column chromatographic procedure for the separation of vacuum residues into saturates, mono-, di-, polyaromatics and polars has been standardized using silica-alumina-bauxite adsorbents and gradient elution with n-pentane, benzene, and methanol. The cut points have been monitored employing ultraviolet and infrared spectroscopy.
Veda Ramaswamy, Vimal Kothiyal, Indra D. Singh, Rajamani Krishna   +3 more
openaire   +1 more source

SOLVENT DEMETALLIZATION OF ATMOSPHERIC AND VACUUM RESIDUES

Petroleum Science and Technology, 1999
Abstract The effectiveness of various solvents for the removal of heavy metals, particularly vanadium and nickel via the removal of asphaltene from atmospheric and vacuum petroleum residues are presented The solvent deasphalting was carried out at 29§C The solvents used in this investigation were pentane, hexane, heptane, petroleum ether, ethyl acetate
O.D. Onukwuli, I.M. Onyia, E.O. Ekumankama, S.f. Okeke   +3 more
openaire   +1 more source

UPGRADING OF PETROLEUM RESIDUES BY VACUUM PYROLYSIS

Fuel Science and Technology International, 1991
ABSTRACT Vacuum pyrolysis of petroleum residues which are classified as hazardous materials was performed in a batch reactor and enabled us to separate an upgraded oil from water and residual solids. Conversion of petroleum wastes to reusable oils reached 85% on an organic basis.
H. Pakdel, Jean-Patrick Blin, C. Roy
openaire   +1 more source

Commercial experience in vacuum residue hydrodesulfurization

1996
Abstract Mizushima Oil Refinery of Japan Energy Corporation has succeeded in a high conversion operation ofvacuum residue in the residue hydrodesulfurization unit equipped with the fixed bed reactors. To complete a sixmonth cycle operation, hot spot occurrence, pressure-drop build-up, and catalyst deactivation had been the most important subjects to ...
openaire   +1 more source

Solvation of Ratawi Asphaltenes in Vacuum Residue

1994
Analyses of small angle X-ray scattering data, and the shear rheology of natural and synthetic Ratawi vacuum residue indicates that Ratawi asphaltenes(heptane insolubles) are polydispersed spheres solvated by the nonasphaltene fluid at 93 °C. The Pal-Rhodes equation attributes the non-linear dependence of the relative viscosity on asphaltene ...
David A. Storm, Ronald J. Barresi, Eric Y. Sheu   +2 more
openaire   +1 more source

Hydrotreating van Arabian heavy vacuum residue

1992
DelftChemTech
Zoetekouw, C. (author), Witte, G.P. (author)   +1 more
openaire   +2 more sources

Residual atmosphere in vacuum fluorescent displays

2017
This paper is devoted to problems of gassing in vacuum fluorescent displays (VFD). Technique of qualitative and quantitative analysis of residual atmosphere in VFDs is presented. Also, dynamics of residual gas pressure under different modes of VFD operation is considered.
Finkelshtein, S.H., Sorokin, V.M., Rakitin, S.A., Sevostyanov, V.P.   +3 more
openaire   +1 more source

Degradation mechanisms of perovskite solar cells under vacuum and one atmosphere of nitrogen

Nature Energy, 2021
Renjun Guo, Dan Han, Wei Chen
exaly  

Life-cycle assessment of an industrial direct air capture process based on temperature–vacuum swing adsorption

Nature Energy, 2021
Sarah Deutz, André Bardow
exaly