توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Thermodynamic study of reformer of the Tehran refinery hydrogen plant using minimization of Gibbs free energy
نویسنده(ها): ، ، ،
اطلاعات انتشار: دهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۷
The equilibrium chemical reactions taken place in a reformer reactor of the Tehran refinery hydrogen plant was studied using the minimization of Gibbs free energy method. In the minimization of the Gibbs free energy function the Davidon–Fletcher–Powell (DFP) optimization procedure using the penalty terms in the well–defined objective function was used. It should be noted that in the DFP procedure along with the corresponding penalty terms the Hessian matrices for the composition of constituents in the reformer reactor can be excluded. This, in fact, can be considered as the main advantage of the DFP optimization procedure. Also the effect of temperature, pressure and steam ratio on the equilibrium composition of the constituents was investigated. The results obtained in this work were compared with the data collected from the reformer reactor of the Tehran refinery hydrogen plant. It was concluded that the results obtained from the method used in this work are in good greement with the industrial data. Notably, the algorithm developed in this work, in spite of its simplicity, takes the advantage of short computation and convergence time.<\div>

۲Thermodynamic study of hydrogen reformer plant by minimization of Gibbs free energy
نویسنده(ها): ، ،
اطلاعات انتشار: پنجمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۸
The equilibrium chemical reactions taken place in a reformer reactor of the Tehran refinery hydrogen plant was studied using the minimization of Gibbs free energy method. To minimization the Gibbs free energy function the Davidon–Fletcher–Powell (DFP) procedure using the penalty terms in the well–defined objective function was used. It should be noted that in the DFP procedure along with the corresponding penalty terms the Hessian matrices for the composition of constituents in the reformer reactor can be excluded. This, in fact, can be considered as the main advantage of the DFP optimization procedure. Also the effect of temperature, pressure and steam ratio on the equilibrium composition of the constituents was investigated. The results obtained in this work were compared with the data collected from the reformer reactor of methanol unit in a specified petrochemical complex. It was concluded that the results obtained from the method used in this work are in good agreement with the industrial data. Notably, the algorithm developed in this work, in spite of its simplicity, takes the advantage of short computation and convergence time.<\div>

۳Correlation and Prediction of Solubility of CO2 in Amine Aqueous Solutions
نویسنده(ها): ، ، ، ، ، ، ، ، ،
اطلاعات انتشار: Iranian Journal of Chemistry and Chemical Engineering (IJCCE)، بيست و نهم،شماره۱(پياپي ۵۳)، ۲۰۱۰، سال
تعداد صفحات: ۱۴
The solubility of CO2 in the primary, secondary, tertiary and sterically hindered amine aqueous solutions at various conditions was studied. In the present work, the Modified Kent–Eisenberg (M–KE), the Extended Debye–Hückel (E–DH) and the Pitzer models were employed to study the solubility of CO2 in amine aqueous solutions. Two explicit equations are presented to evaluate the concentration of H+ as well as the equilibrium constants of protonation reactions for the tertiary and sterically hindered amine aqueous solutions. Using the M–KE model, the equilibrium constants of protonation reactions of amines were correlated in terms of temperature, CO2 partial pressure and amine concentration. Also the E–DH and Pitzer models were used to correlate the solubility of CO2 in MDEA aqueous solution. The binary interaction parameters for the models studied in this work as well as the parameters for the equilibrium constants of protonation reactions were obtained using the Davidon–Fletcher–Powell (DFP) minimization method. The results show that the M–KE, E–DH and the Pitzer models can accurately predict the corresponding experimental data. Although the solubility data for CO2 in amine aqueous solutions have been reported in the literature to a large extent, accurate data are required to model the CO2 absorption process. Therefore, two criteria for the tertiary and sterically hindered amines were presented using the M–KE model to screen the experimental data.
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