Fahad Rehman

Dr. Fahad Rehman

Microfluidics Research Group, Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Pakistan
orcid

Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
1 May 2020 in Journal of Hazardous Materials
Verified
Journal Article
Closed access
Muhammad Tahir FazalMuhammad Tahir Fazal
Muhammad Tahir Fazal
ARAbdul Razzaq
Abdul Razzaq
FJFahed Javed
Fahed Javed
AHAiny Hafeez
Ainy Hafeez
NRNaim Rashid
Naim Rashid
FRFahad Rehman
Fahad Rehman

1 October 2021 in Chemosphere
Verified
Journal Article
Closed access
TFTahir Fazal
Tahir Fazal
MRMuhammad Saif Ur Rehman
Muhammad Saif Ur Rehman
FJFahed Javed
Fahed Javed
MAMueed Akhtar
Mueed Akhtar
AMAzeem Mushtaq
Azeem Mushtaq
FRFahad Rehman
Fahad Rehman

7 September 2022 in Biomass and Bioenergy
Verified
Journal Article
Open access
FJFahed Javed
Fahed Javed
FRFahad Rehman
Fahad Rehman
AKAsad Ullah Khan
Asad Ullah Khan
TFTahir Fazal
Tahir Fazal
AHAiny Hafeez
Ainy Hafeez
NRNaim Rashid
Naim Rashid

1 February 2021 in Chemical Engineering and Processing - Process Intensification
Verified
Journal Article
Closed access
AHAiny Hafeez
Ainy Hafeez
FJFahed Javed
Fahed Javed
Muhammad Tahir FazalMuhammad Tahir Fazal
Muhammad Tahir Fazal
NSNasir Shezad
Nasir Shezad
UAUm-E-Salma Amjad
Um-E-Salma Amjad
FRFahad Rehman
Fahad Rehman

21 December 2019 in Biomass Conversion and Biorefinery
Verified
Journal Article
Closed access
PDF file
TFTahir Fazal
Tahir Fazal
AFAbrar Faisal
Abrar Faisal
AMAzeem Mushtaq
Azeem Mushtaq
AHAiny Hafeez
Ainy Hafeez
FJFahed Javed
Fahed Javed
FRFahad Rehman
Fahad Rehman

16 January 2019 in Reaction Chemistry & Engineering
Verified
Journal Article
Closed access
PDF file
FJFahed Javed
Fahed Javed
ZSZufishan Shamair
Zufishan Shamair
SAShahzad Ali
Shahzad Ali
NANaveed Ahmad
Naveed Ahmad
AHAiny Hafeez
Ainy Hafeez
FRFahad Rehman
Fahad Rehman
Esterification, a reaction extensively used in chemical processing, is limited by the establishment of kinetic equilibrium, i.e. marginally exer/endergonic. The reaction is generally slow with low yield making downstream separation cost intensive. A new heterogeneous contacting method for the synthesis of ethyl acetate through fine bubbles tests the hypothesis that reactive distillation can “pull” the reaction nearer to completion, reducing the downstream separation requirements. It achieves a high yield of ethyl acetate, 79.9% in 35 min, as compared with 64% conversion in 350 min using a conventional method. The kinetics of esterification reaction under bubbly flow conditions are studied – entirely different from the conventional bulk model. The alcohol is fed as vapor within the bubbles which means alcohol is always in deficit, providing an opportunity to convert an equilibrium limited reaction to nearly irreversible one. As the bubbles flow upwards, the reaction proceeds at the “skin” of the bubble. If the esterification reaction occurs at or near the microbubble interface, ethanol is in large excess in the bubble phase, as acetic acid is well below its boiling point in the liquid phase. By Le Chatelier's principle, the local excess ethanol will push the equilibrium towards completion. Similarly, removal of water and ethyl acetate via the “dry” bubble pulls the equilibrium towards completion.