THERMODYNAMIC AND KINETIC STUDIES OF DRY REFORMING OF METHANE FOR SYNTHESIS GAS PRODUCTION

• Main Author: Hafsah
• Format: Theses
• Language: Indonesia
• Subjects: Teknik kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/64182
• Institution: Institut Teknologi Bandung

Natuna Islands is one of the islands which has the largest natural gas stockpile in Indonesia. Dry Reforming of Methane (DRM) is one of the routes in natural gas processing. DRM has the potential to be developed, yet DRM has not known as an industrial process that is commonly used because of its extremely endothermic reaction and relatively fast carbon formation rate. In these studies, the thermodynamic study were analyzed using Aspen Plus V.10. The reactor model used in the thermodynamic study is RGIBBS and the reactor model used in the kinetic study is a one-dimensional pseudo-homogenous model. The kinetic study was analyzed using FlexPDE V.6. The catalyst used is a Ni catalyst with Al2O3 support. The reaction kinetics model is based on the LangmuirHinshelwood mechanism. One method to minimize carbon formation process in DRM is to add steam in the feed. Steam was added to the system by steady-state and dynamic modulation methods. The type of reactor used in this study is the fixed bed reactor (FBR). The length of the reactor used in this study is 0.22 m with an inner diameter of 0.0008 m. Validation was done by plotting the simulation results from literature and the simulation results of the model. The error of the simulation model and literature results is less than 5% so that the model can be used. The results of the thermodynamic study showed that the higher operating temperature, the lower operating pressure, and CH4/CO2 feed composition ?1 resulted in higher conversion of reactants and product yields. The steady-state kinetics simulation results for CH4 conversion, CO2 conversion, CO yield, H2 yield, H2/CO ratio, and carbon formation rate are 88.39%, 72.61%, 65.77%, 80.23%, 1.2 and 0.05 micromoles/second respectively. The addition of steam feed as much as 50% of methane resulted in a 60% decrease in the carbon formation rate compared to without the addition of steam feed. The results of CH4 conversion, CO2 conversion, CO recovery, H2 recovery, H2/CO ratio, and carbon formation rate in the modulation of addition of 50% H2O feed from methane were 89.29%, 54.96%, 66.32%, 96, 68%, 1.37, and 0.02 micromol / sec respectively. The recommended operating conditions based on the results of this study are 1 bar for operating pressure, 650ºC for operating temperature, and 1/1.13/0.5 for CH4/CO2/H2O feed composition.