A - methal sturene hydrogenation in a batch and single channel monolithic reactors.

مقدم أطروحة جامعية

al-Kareemawi, Adil A. Shuhaib

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكيمياوية

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2008

الملخص الإنجليزي

Monolithic reactor has been studied as a replacement for conventional multi-phase reactors such as trickle bed reactor, stirred tank continuous slurry reactors, and slurry bubble column reactors for three phase catalytic reactions.

The kinetic of AMS hydrogenation on pd / y-Alloy (03 Pd wt %.) were investigated in the temperature range of 343-373 K and pressure range of 10-20 bar for batch STR., and 343-393 K and 10-30 bar for SCMR.

Nine kinetic models were developed describing Langmuir-Hinshelwood mechanisms for both STR & SCMR with a non-competitive (dual-site) molecular or atomic adsorption of hydrogen and molecular adsorption of AMS and surface reaction as the rate-controlling step.

Test each model with the Aspen Custom Modeler (ACM) software program by introducing the experimental results in the flow sheet of this software program and error between experimental and numerical results.

Kinetic experiments have been conducted to characterize the system under steady state conditions.

Kinetic parameters for the kinetic model expressions were determined for both reactor types using (ACM) commercial software program.

The best kinetic model for batch STR was : -rs = (Kk AKH2CACH2)/(1+KA Ca+ √(K H2 CH2)) with activation energy was about 39 kJ/rnol., while for SCMR was : rs = (Kk AKH2CACH2)/(1+KA Ca+ √(K H2 CH2) With activation energy was about 23kJ / moL The hydrogenation kinetics obtained provides good agreement between experimental and predicted rates of reaction in the range investigated.

The experimental results obtained cover the different periodic parameters such as pressures (10, 15and 20 bar), isothermal temperatures (343, 353, 363 and 373 K), diameter of the catalyst particles (4,28 and 37.36 urn), stirrer speed (1000 and 1400 rpm), and catalyst weight ( 0.1 and 0.2 gm)T for batch STR, and pressures (10, 20, and 30 bar), isothermal temperatures (343, 363, 383, and 393 K), gas-liquid superficial velocities (10-30 cm/ s), flow modes (up and down flow), flow operations (single pass and recirculation), catalyst loading (0.004977 and 0.0017167 gm Pd), and gas-liquid distributor type (T-junction and micro-mixer) for SCMR.

Finally, one dimensional model was investigated to describe the conversion of AMS in single pass down flow mode at temperature and pressure 333 K and 10 bar respectively, and different superficial gas and liquid superficial velocities (10-30 cm / s) for SCMR.

The pressure drop results from this model was too low (1 %) from total pressure.

التخصصات الرئيسية

الكيمياء

الموضوعات

• النماذج الرياضية
• المفاعلات الكيميائية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305159