April 2014

Refining

Improve thermodynamic equilibrium among light olefins in FCC operations

Worldwide propylene demand is strongly increasing. About 28% of the global propylene supply comes from refinery fluid catalytic cracking (FCC) units. The light olefins have relative selectivity due to..

Jaguste, S. D., Jain, B., Reliance Industries Ltd.

Worldwide propylene demand is strongly increasing. About 28% of the global propylene supply comes from refinery fluid catalytic cracking (FCC) units. The light olefins have relative selectivity due to the stability of intermediate carbenium ions. The composition of light olefins is related to the minimum Gibbs free energy. The selectivity of propylene can be analyzed at varying pressure and temperature conditions. In the presented case history, the thermodynamic conditions that would maximize propylene selectivity are estimated for a once-through operation and also when certain components are recycled. Recycling C4s and C5s to extinction is estimated to provide maximum propylene yield impro

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