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Optimization analysis of the absorption-stabilization process for fluid catalytic cracking unit
Hussain Muhammad Saddam,Ahmed Ashfaq,Yibin Liu,Amin Muhammad Nadeem,Zahoor Tahir,Saleem Muhammad Afnan,Roh Kosan,Hussain Murid,Abu Bakar Muhammad Saifullah,박영권 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
The absorption-stabilization process (ASP), an important part of petroleum refinery used in the end-use products of petroleum (such as stable gasoline, liquid petroleum gas, and dry gas), is energy-intensive and has low product quality. Aspen Plus process simulator was used for the development of the ASP process model. The developed process model was validated with the actual plant data. The validated model was used to optimize to minimize the cost of the ASP. This work shows that the optimization analysis of the ASP can further improve the product quality and reduce thermal energy consumption. In the new process, changing feeding parameters of supplementary absorption oil, stripping tower intermediate reboiler, and feeding position of stabilization tower reduced the C3 contents of dry gas considerably and lowered the C2 and lighter contents of LPG. Additionally, the new process saved 1.32 MW of thermal energy consumption compared with the existing process. The operating cost has been reduced from 10.921 million USD annually to 9.830 million USD per year. Furthermore, the cost-saving effect of this optimization is about 9.99% (1.091 million USD per year).
송선기,( Murid Hussain ),임선기 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
Two different mesoporous materials, MCM41(one-dimensional channel) and MCM-48(threedimensional channel), were used as supports for CoMo sulfide catalysts to investigate the effect of different channel connectivity on the catalytic activity of thiophene hydrodesulfurization. The aluminosilicate mesoporous materials (Al-MCM-41 and Al-MCM-48) were prepared through post impregnation of AlCl3 into the siliceous mesoporous materials, MCM-41 and MCM-48, respectively. The aluminosilicatesupported CoMo catalysts showed higher activity than their siliceous counterparts. The acidity of the aluminosilicate supports as measured by NH3-TPD might help to crack the thiophene so as to improve the HDS activity. The CoMo (3:7)/Al-mesoporous materials showed the highest activity up to 10 h for a given Si/Al ratio. It is expected that CoMo catalysts with Co/Mo atomic ratio of 3/7 having three-dimensional mesopore structures would be more useful for HDS process than the same catalysts with one-dimensional mesopore structure.
Usama Shakeel,Murid Hussain,Rizwan Sheikh,Ashfaq Ahmed,Muhammad Shahid Nazir,Wenshu Yang,Nasir Shezad,Parveen Akhter,박영권 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.5
This study aimed at the synthesis of heterogeneous acid catalysts by incorporating 12 tungstophosphoric acid (HPW) over mesoporous silica support KIT-6 via impregnation and sol-gel methods to improve the catalytic efficiency of the esterification reaction. The catalytic activity of the KIT-6 supported catalysts was investigated for esterification of oleic acid in the presence of MeOH. Synthesized catalysts were analyzed using scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and Fourier transform infrared (FTIR) spectroscopy techniques. Characterization results showed the variation in porosity, roughness, presence of SiO2 and kegging structure after successful deposition of HPW over KIT-6 surface. Additionally, the textural property of synthesized catalysts was compared with highly active HPW and sulfated KIT-6. The ordered structure of mesoporous silica KIT-6 facilitated the dispersion of HPW resulting in better catalytic stability and activity. To evaluate the impact of synthesizing technique on catalytic activity and effectiveness of heterogeneous acid catalysts, loading of HPW over KIT-6 mesoporous silica was controlled between 10 to 30 wt%. Catalysts synthesized by impregnation and sol-gel methods showed the highest catalytic activity with 30- IM and 25-SG, respectively. The enhanced performance was ascribed to the improved textural property and amount of HPW, which led to higher activity, stability and reusability
Oxidative desulfurization of refinery diesel pool fractions using LaVO4 photocatalyst
Iqrash Shafiq,Murid Hussain,Sumeer Shafique,Ruhma Rashid,Parveen Akhter,Ashfaq Ahmed,전종기,박영권 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
Oxidative desulfurization (ODS) is a swiftly rising organosulfur compounds eradicating system, effectiveenough at a mild temperature and pressure, overwhelming the necessity of costly hydrogen in thetraditional HDS systems. In this study, pure LaVO4 photocatalyst was prepared using the hydrothermalapproach and employed for deep oxidative desulfurization application in the aerobic environment undervisible-light irradiations. The as-prepared photocatalyst semiconductor material was characterized byFTIR, SEM, UV–vis DRS and Raman analyses. The examined photocatalyst presented a narrow bandgap, asmall particle size, high photo-responsive monoclinic phase, high light photons capturability, plenteousactive sites accessibility and reduced recombination of photogenerated charge carriers, ensuing a goodvisible-light-driven deep oxidative desulfurization ability. The photocatalytic material was tested for itsperformance over different petroleum refinery diesel pool fraction streams including hydrodesulfuriza-tion unit diesel rundown, mild hydrocracking unit rundown gas oil, heavy kerosene oil and the ultimatediesel oil blend, containing organosulfur compounds ranging from disulfides to the stringentorganosulfur compounds, with the quantity lying between 57 and 863 ppm. The kinetic study wasfound in agreement with the pseudo-first-order kinetics. The conceivable desulfurization mechanismwas also anticipated. Moreover, the recyclability of the photocatalytic material was also discussed.