Heavy naphtha reforming reactions with bi and tri metallic catalysts experimental and analytical investigation

مقدم أطروحة جامعية

al-Falih, Ramzy Syhood Hamied

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكيمياوية

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2008

الملخص الإنجليزي

Catalytic reforming of heavy naphtha is a very important process for producing high octane gasoline, aromatic feedstock and hydrogen in petroleum-refining and petrochemical industries.

In present work experimental and theoretical studies have been carried out on bimetal and tri-metal supported on A1303 catalysts using catalytic reforming process.

Hoe Iraqi heavy naphtha is used as a feedstock for the process.

The dehydmgenation, dehydrocyclization, and hydro racking reaction were investigated to characterize the catalysts performance toward higher activity and selectivity to desired products.

Four types of catalysts were prepared in the present investigation, two of which are bi-metal and the other two are tri-metal catalysts.

Bi-metal catalyst was prepared by impregnation the Pt/ y-Al203 with tin chloride (Sn 0.3 wt %) and loading iridium chloride (Ir 0.l wt %) on Pt / 7-Al203.

On the other hand tri-metal catalyst was prepared by co-impregnation the Pt-Re/ y, Al303 with tin chloride (Sn 0.l wt %) and iridium chloride was loaded (Ir 0.l wt %) on Pt-Sn / y-Al20, by using successive impregnation.

A catalytic unit was constructed to carry out the reforming process made of stainless steel The reactor dimensions were O.D 30mmt LD 20mm, and 68 cm of reactor height.

The performance of catalysts was studied under the following operating condition: weight hour space velocity in the range of (1-2 hr"1), reaction temperature in the range of {480-510 = C) The results showed that the conversion of heavy naphtha components (Paraffin's and Naphthenic) increases with increasing of reaction temperature and decreases with increasing of weight hour space velocity.

Also, it was noted that the yields of aromatics and light component increase for all types of catalysts at the same condition.

It is observed that the Pt-Sn / y-Al20? catalyst gives higher yield of aromatics components (33,6"7mole %) at 510 °C, and weight hour space velocity (1 hr"1) than that of the other catalysts of type Pt-Re-Sn / y-A1203 (32.12moIe %), Pt-Ir-Sn/ y-A1203 (3L7molc %), and Pt-Ir/ y-Ab OJ (29.41mole %).

On the other hand the high conversion to light component was given by Pt-Ir-Sn/ y-Al2 of value of 64.6%, while, the conversions of the other catalysts were 60 %, 48 %, and 40.5 % for Pt-Re-Sn / y-Al203, Pt-Ir / Y-Al20-i, and Pt-Sn / y-Al203 respectively under the same condition.

A comprehensive mathematical model and simulation was developed to describe the reaction kinetics in catalytic reforming process in the presence of heavy naphtha as feedstock.

The model predicts the concentration, conversion, and temperature profile with time and axial direction of the reactor.

The differential equations were solved numerically using finite difference approach with implicit solution.

The results of concentration, conversion, and temperature profile of experimental and simulation results show a good agreement with a deviation ranging between (1.93 % to 19.55 %).

التخصصات الرئيسية

الكيمياء

الموضوعات

• المفاعلات الكيميائية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305141