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Article
A STUDY OF PHASE EQUILIBRIUM OF H2S IN SEVERAL PHYSICAL SOLVENTS USING CHEMCAD SIMULATOR
دراسة اتزان الاطوار لغاز كبريتيد الهيدروجين (H2S) مع عدة مذيبات فيزياويةباستعمال برنامج المحاكاة الجاهز CHEMCAD

Author: Dr. Zaid A. Abdel-Rahman
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2008 Volume: 15 Issue: 3 Pages: 38-48
Publisher: Tikrit University جامعة تكريت

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Abstract

CHEMCAD process simulator was used for the analysis of the literature experimental phase equilibrium data of H2S with three physical solvents (Sulfolane, Propylene Carbonate (PC), and N-Methyl-2-Pyrrolidone (NMP)) at different temperatures ( 298.15 oK , 323.15 oK, and 373.15 oK). Two thermodynamic models, Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK), were used.
The equilibrium data of H2S- Sulfolane and H2S- Propylene Carbonate (PC) systems were successfully correlated using SRK thermodynamic model. The deviation was noticed only for H2S-Sulfolane system as the temperature increases to 373 oK, to give a deviation of less than 5% .
The thermodynamic models used in present study, PR, and SRK , built in CHEMCAD simulator and used as such without modification, fail to correlate the equilibrium data of H2S- NMP (N-Methyl-2-Pyrrolidone) system for all temperature range used.
Modifications of the thermodynamic models were performed by editing user defined binary interaction parameters (BIP) of the systems used, gives good results.

KEYWORDS
Vapor–Liquid Equilibria, H2S, Physical Solvents, CHEMCAD Simulator, Thermodynamic Models, Equation of state and correlation

Keywords


Article
PARAFFIN SEPARATION VACUUM DISTILLATIONCOLUMN ANALYSIS IN LINEAR ALKYL BENZENE (LAB)CHEMICAL PLANT USING CHEMCAD SIMULATOR
تحليل عمود التقطير الفراغي لفصل البارافين لمصنع انتاج الالكيل بنزين المستقيم باستعمال برنامج المحاكاة الجاهز CHEMCAD

Authors: Omar S. Latif --- Zaid A. Abdel-Rahman
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2009 Volume: 16 Issue: 1 Pages: 15-30
Publisher: Tikrit University جامعة تكريت

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Abstract

Simulated column performance curves were constructed for existing paraffin separation vacuum distillation column in LAB plant (Arab Detergent Company/Baiji-Iraq). The variables considered in this study are the thermodynamic model option, top vacuum pressure, top and bottom temperatures, feed temperature, feed composition & reflux ratio. Also simulated columns profiles for the temperature, vapor & liquid flow rates composition were constructed. Four different thermodynamic model options (SRK, TSRK, PR, and ESSO) were used, affecting the results within 1-25% variation for the most cases.
The simulated results show that about 2% to 8 % of paraffin (C10, C11, C12, & C13) present at the bottom stream which may cause a problem in the LAB plant. The major variations were noticed for the top temperature & the paraffin weight fractions at bottom section with top vacuum pressure. The bottom temperature above 240 oC is not recommended because the total bottom flow rate decreases sharply, where as the weight fraction of paraffins decrease slightly. The study gives evidence about a successful simulation with CHEMCAD

KEYWORDS
Process simulation, CHEMCAD Simulator, multicomponent distillation, LAB, paraffin column, vacuum pressure

Keywords


Article
Utilization of CO2 in Flue Gas for Sodium Bicarbonate Production in a Bubble Column

Authors: Zaid A. Abdel-Rahman --- Zeyad A. Abdullah
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2019 Volume: 26 Issue: 2 Pages: 28-38
Publisher: Tikrit University جامعة تكريت

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Abstract

Utilization of CO2 in flue gases for the production of sodium bicarbonate is an environmentally friendly process. A mathematical model was constructed for the design and simulation of utilizing a low concentration CO2 (2-18%) in flue gas to produce sodium bicarbonate in a bubble column reactor. The model is based on the mass balance equations for three phases (gas, liquid, and solid). Danckwerts theory for mass transfer from the gas phase to the liquid phase coupling with chemical reaction, and crystallization mechanism was used. The effect of process variables; gas molar velocity or flux (G=2.5-10 mole/m2.s), liquid mass flow rate (mL=2800-3400 kg/h), sodium bicarbonate concentration (x1=0.04-0.1), CO2 gas mole fraction (y=0.02-0.18), column height (h=11-33 m), and column diameter (dR=1-3 m) on the objective variables; solid molar velocity (S), CO2 conversion, precipitation zone height (Zi), and crystal size distribution (CSD) were studied. The conversion of CO2 varied from 34% to 71% whereas the particle size range varied from 0 to 400 μm. The particle size range and the CO2 absorption efficiency of about 50% for 20 m column height are in agreement with the literature.


Article
دراسة في المحاكاة النظرية لتحليل عمود فصل البنزين لمصنع انتاجالالكيل بنزين المستقيم باستخدام البرنامج الجاهز CHEMCAD
PROCESS SIMULATION OF BENZENE SEPARATION COLUMN OF LINEAR ALKYL BENZENE (LAB)PLANT

Authors: Omar Saed Latef --- Dr. Zaid A. Abdel-Rahman
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2008 Volume: 15 Issue: 1 Pages: 17-29
Publisher: Tikrit University جامعة تكريت

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Abstract

CHEMCAD process simulator was used for the analysis of existing benzene separation column in LAB plant(Arab Detergent Company/Beiji-Iraq).
Simulated column performance curves were constructed. The variables considered in this study are the thermodynamic model option, top and bottom temperatures, feed temperature, feed composition & reflux ratio. Also simulated columns profiles for the temperature, vapor & liquid flow rates compositions, were constructed. Four different thermodynamic models options (SRK, TSRK, PR, and ESSO) were used, affecting the results within 1-25% variation for the most cases.
For Benzene Column (32 real stages, feed stage 14), the simulated results show that bottom temperature above 200 oC the weight fractions of top components, except benzene, increases sharply, where as benzene top weight fraction decreasing sharply. Also, feed temperature above 180 oC shows same trends. The column profiles remain fairly constant from tray 3 (immediately below condenser) to tray 10 (immediately above feed) and from tray 15 (immediately below feed) to tray 25 (immediately above reboiler). Simulation of the benzene separation column in LAB production plant using CHEMCAD simulator, confirms the real plant operation data. The study gives evidence about a successful simulation with CHEMCAD.

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Article
Study the Behavior of Long Spiral Tube Adsorber for Oxygen Separation from Air
دراسة تصرف انبوب الامتزاز الملفوف الطویل لفصل الاوكسجین من الھواء

Authors: Zaid A. Abdel-Rahman --- Abdulbasit H. Mhdi --- Ahmed J. Ali
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 17 Part (A) Engineering Pages: 3371-3381
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Single long spiral tube column (25 mm diameter, and 4 m bed length) had beenconstructed to study the separation of oxygen from air using commercial 13Xzeolite. The effect of adsorption pressure on the system breakthrough curves wasstudied. Single column with initial air pressurizing simulates the work of 2-columns, 4-steps PSA process, whereas single column with initial intermediatepure oxygen pressurizing simulates the work of 2-columns, 6-steps PSA processwith pressure equalization steps of the two columns. No significant effect ofpressure on the product oxygen purity is noticed when pressure increased from 2 to5 bar in both cases.For initial air pressurizing case, the average maximum effluent oxygen purity of88% is obtained. The range of zeolite loading capacity is q=0.25-0.35 mole N2/kgzeolite, and only 40% of the range has been utilized before breakthrough time.Whereas for initial oxygen pressurizing case, the maximum oxygen purity of 95%is obtained. The range of zeolite loading capacity is q=0.39-0.87 mole N2/kgzeolite, and 95% of the range has been utilized before breakthrough time, whichagree well with the equilibrium data of multicomponent Langmuir adsorptionequation.


Article
Ethanol-Water Separation by Pressure Swing Adsorption (PSA)

Authors: Zaid A. Abdel-Rahman --- Abdulrahman M. Mahmood --- Ahmed J. Ali
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2014 Volume: 15 Issue: 2 Pages: 1-7
Publisher: Baghdad University جامعة بغداد

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Abstract

Single long spiral tube column pressure swing adsorption (PSA) unit, 25 mm diameter, and 6 m length was constructed to study the separation of water from ethanol at azeotropic concentration of 95 wt%. The first three meters of the column length acted as a vaporizer and the remaining length acted as an adsorber filled by commercial 3A zeolite. The effect of pressure, temperature and feed flow rate on the product ethanol purity, process recovery and productivity were studied. The results showed that ethanol purity increased with temperature and pressure and decreased with feed flow rate. The purity decreased with increasing productivity. The purity range was 98.9 % to 99.6 %, the recovery range was 0.82 to 0.92 and the productivity range was 0.3 to 1.05 kg ethanol/kg zeolite.h.


Article
Parametric Study for Nitrogen Separation from Air by Pressure Swing Adsorption Using Carbon Molecular Sieve

Authors: Zaid A. Abdel-Rahman --- Abdulbasit H. Mhdi --- Heba S. Auob
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2016 Volume: 23 Issue: 2 Pages: 1-9
Publisher: Tikrit University جامعة تكريت

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Abstract

The separation of air by carbon molecular sieve (CMS) adsorption was studied in this work over a range of adsorption pressure of (2–8) bar. Breakthrough curves showed no significant effect of the pressure on product nitrogen purity and adsorbent capacity above 4 bar. Maximum purity of about 98% is observed for time up to 60 s. Adsorbent capacity obtained is in agreement with multicomponent Langmuir isotherm up to 4 bar. Maximum constant adsorbent capacity of about 0.1 mol O2/kg CMS is obtained for pressure above 4 bar. For PSA two columns 6-steps process, no significant effect of the pressure on the product purity above 4 bar. The purity increases with decreasing the productivity. Maximum purity of 97.6% is obtained at productivity of 156 lit/kg CMS.hr, cycle time of 100 s, and purge flowrate of 1 lit/min. The productivity of 606 lit/kg CMS.hr is obtained at purity of 94%, cycle time of 60s, and purge flowrate of 4 lit/min.

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