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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).
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Adeeba Khadim,Bibi Zareena,Saddam Hussain,Syed Usama Yaseen Jeelani,Arslan Ali,Syed Ghulam Musharraf 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
High-throughput and efficient identification of drugs in a complex mixture is required in many pharmaceuticalindustries and drug testing laboratories. The present study aims to utilize an efficient poolingstrategy for the preparation of high-resolution tandem mass spectrometry (HR-MS/MS) library of drugswith different therapeutic properties. Compounds were classified into four classes of low, medium–low,medium–high and high log P values and were pooled into five pools (100 drugs pool). Compounds withisobaric and close log p values were placed in separate groups to overcome the co-elution problem. Liquidchromatography quadrupole time-of-flight mass spectrometry (LC-QTOF-MS) was utilized to generate ahigh-resolution tandem mass spectrometry (MS/MS) spectral library in both positive and negative electrosprayionization modes of 491 drugs. Spectra were collected by LC-MS/MS analysis using system automatedcollision energy i.e. of 25–60 eV and four predetermined collision energies (10, 20, 30 and 40 eV)for each compound using schedule precursor list of [M + H]+ and [M + Na]+ ions. To validate the applicabilityof the library, serum samples spiked at three concentrations close to bioavailability (0.308 ng/mL,3.08 ng/mL and 30.08 ng/mL) of drugs and were analyzed by LC-QTOF-MS/MS. The HRMS library searchsuccessfully identified all compounds present in the spiked serum samples based on exact masses of precursorions, MS/MS data, and retention time etc. The accurate mass LC-QTOF-MS based tandem massspectral libraries represent a useful tool for the identification of drugs in clinical samples, for pharmacologicaland forensic screening applications etc.
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