(375o) Light Alkane Valorization to Ethylene Via Chemical Looping Oxidative Dehydrogenation
- Conference: AIChE Annual Meeting
- Year: 2018
- Proceeding: 2018 AIChE Annual Meeting
- Group: Particle Technology Forum
- Time: Tuesday, October 30, 2018 - 3:30pm-5:00pm
We have identified, in our previous work, a family of mixed oxides which can function as excellent redox catalysts for ODH. They are capable of supplying lattice oxygen at rates comparable to the rate of hydrogen formation via thermal cracking of the alkane feed. The bulk and near-surface properties of the oxide system can be improved by modifying the redox catalyst to produce ethylene with exceptional selectivity by suppressing deep oxidation of ethylene. The facile combustion of hydrogen favored by the promoted redox catalyst leads to high ethylene yield providing the heat required for the endothermic dehydrogenation reaction. CL-ODH of these light alkanes is modeled using ASPEN Plus and is compared with a conventional stream cracking process. Results show that CL-ODH with 85% ethane conversion provides over 80% reduction in the overall energy demand and CO2 emissions, with over 50% savings, for the naphtha feed. The exothermic nature of the regenerator and elimination of the steam requirement lead to major reductions in the upstream energy consumption.