absorption

Husni Odeh's picture

Hydrodynamics and Mass Transfer of Textile Vibrating-Valve Trays

Journal Title, Volume, Page: 
Chemical Engineering Research and Design Volume 77, Issue 7, Pages 627–632
Year of Publication: 
1999
Authors: 
H. Mustafa
Chemical Engineering Department, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Chemical Engineering, Faculty of Engineering and Informtation Technology, An-Najah National University, Nablus, Palestine
A. Elhamouz
Chemical Engineering Department, An-Najah National University, Nablus, Palestine
E. Békássy-Molnár
Department of Food Engineering, University of Horticulture and Food, Budapest, Hungary
Preferred Abstract (Original): 

New types of vibrating-valve trays with textile valves were investigated to determine their optimal construction. Hydrodynamic and mass transfer measurements were carried out in a pilot plant with different vibrating-valve and conventional valve trays under identical experimental conditions. The total tray pressure drop (ΔP), column efficiency (η), volumetric mass transfer coefficient (KGa) and pressure drop per theoretical tray (Δp/Nth) were measured and compared.The high mass transfer rate, the low investment and operating costs, the corrosion and heat resistance make the vibrating-valve trays attractive for gas absorption and air cleaning in environmental protection.

shawahna's picture

Very Rapid Dissolution Is Not Needed To Guarantee Bioequivalence for Biopharmaceutics Classification System (BCS) I Drugs

Journal Title, Volume, Page: 
J Pharm Sci. 2010 Feb;99(2):621-5
Year of Publication: 
2010
Authors: 
H. Kortejärvi
Research and Development, Orion Pharma, Espoo, Finland
A. Koski
Research and Development, Orion Pharma, Espoo, Finland
R. Shawahna
Research and Development, Orion Pharma, Espoo, Finland
Current Affiliation: 
Department of Pharmacy, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
J. Malkki
Research and Development, Orion Pharma, Espoo, Finland
K. Ojala
Research and Development, Orion Pharma, Espoo, Finland
M. Yliperttula
Research and Development, Orion Pharma, Espoo, Finland
Preferred Abstract (Original): 
Currently, the EMEA, FDA, and WHO as regulatory authorities accept rapidly dissolving (>85% dissolved in 30 min) biopharmaceutics classification system (BCS) I drug products for biowaiver candidates. In the draft EMEA guideline the requirement has been set tighter, that is, the drug product should be very rapidly dissolving (>85% dissolved in 15 min) to be eligible for a biowaiver. Pharmacokinetic modeling of 32 BCS I drugs was performed to demonstrate that very rapid dissolution is not necessary to guarantee bioequivalence for them. Rapid dissolution and similar dissolution profiles are sufficient criteria for all BCS I drugs.
elhamouz's picture

Hydrodynamics and Mass Transfer of Textile Vibrating-Valve Trays

Journal Title, Volume, Page: 
Trans IChemE, vol. 77, part A, 627, (1999).
Year of Publication: 
1999
Authors: 
A. Elhamouz
Chemical Engineering Department, An-Najah National Uni V ersity, P.O. Box 7, Nablus, Palestine
Current Affiliation: 
Chemical Engineering Department, An-Najah National Uni V ersity, P.O. Box 7, Nablus, Palestine
H. Mustafa
Chemical Engineering Department, An-Najah National Uni V ersity, P.O. Box 7, Nablus, Palestine
E. Békássy-Molnár
Department of Food Engineering, University of Horticulture and Food, Budapest, Hungary
Preferred Abstract (Original): 
New types of vibrating-valve trays with textile valves were investigated to determine their optimal construction. Hydrodynamic and mass transfer measurements were carried out in a pilot plant with different vibrating-valve and conventional valve trays under identical experimental conditions. The total tray pressure drop (ΔP), column efficiency (η), volumetric mass transfer coefficient (KGa) and pressure drop per theoretical tray (Δp/Nth) were measured and compared. The high mass transfer rate, the low investment and operating costs, the corrosion and heat resistance make the vibrating-valve trays attractive for gas absorption and air cleaning in environmental protection.
nassar's picture

Scavenging H2S(G) From Oil Phases By Means Of Ultradispersed Sorbents

Journal Title, Volume, Page: 
Journal of Colloid and Interface Science Volume 342, Issue 2, 15 February 2010, Pages 253-260
Year of Publication: 
2010
Authors: 
Maen M. Husein
Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB, Canada T2N 1N4
Luis Patruyo
Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB, Canada T2N 1N4
Pedro Pereira-Almao
Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB, Canada T2N 1N4
Nashaat N. Nassar
Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB, Canada T2N 1N4
Current Affiliation: 
Department of Chemical Engineering, An-Najah National University, P.O. Box 7, Nablus, Palestine
Preferred Abstract (Original): 
Ultradispersed catalysts significantly enhance rates of reaction and mass transfer by virtue of their extended and easy accessible surface. These attractive features were exploited in this study to effectively capture H2S(g) from an oil phase by ultradispersed sorbents. Sorption of H2S(g) from oil phases finds application for scavenging H2S(g) forming during heavy oil extraction and upgrading. This preliminary investigation simulated heavy oil by (w/o) microemulsions having 1-methyl-naphthalene; a high boiling point hydrocarbon, as the continuous phase. H2S(g) was bubbled through the microemulsions which contained the ultradispersed sorbents. The type and origin of sorbent were investigated by comparing in situ prepared FeOOH and commercial α-Fe2O3 nanoparticles as well as aqueous FeCl3 and NaOH solutions dispersed in the (w/o) microemulsions. The in situ prepared FeOOH nanoparticles captured H2S(g) in a chemically inactive form and displayed the highest sorption rate and capacity. Temperature retarded the performance of FeOOH particles, while mixing had no significant effect.
Syndicate content