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Reactors, Kinetics, and Catalysis Role of Distributed Oxygen Addition and Product

Summary: Reactors, Kinetics, and Catalysis
Role of Distributed Oxygen Addition and Product
Removal in the Oxidative Coupling of Methane
Ioannis P. Androulakis and Sebastian C. Reyes´
Corporate Research Laboratories, Exxon Research and Engineering Company, Annandale, NJ 08801
Modeling and optimization of C hydrocarbon production Žia the oxidatiŽe coupling2
( )of methane OCM were studied. The model includes both homogeneous and heteroge-
neous reactions. Focusing on the use of detailed reaction networks, preŽiously Žalidated
experimentally, and the critical role of oxygen in both methane actiŽation and product
degradation, this work systematically explores the use of controlled oxygen addition and
product remoŽal schemes that improŽe OCM performance. Based on a plug flow reac-
tor that is diŽided into N stages, within which oxygen is added andror products arep
remoŽed, a rigorous optimization algorithm is deŽeloped that simultaneously maximizes
C yields and minimizes O consumption. In the absence of catalyst and product re-2 2
moŽal, the C yield is maximized at a fixed O rCH ratio, but this maximum yield is2 2 4
( )independent of the form in which the oxygen is added cofeed or staged . When a
catalyst is added, the optimal C yields show only gradual improŽements with oxygen2
distribution because the benefits of the lower oxygen reaction order on the catalyst are
adŽersely affected by concomitant surface degradation reactions. The largest yield im-
proŽements are obtained when the C hydrocarbons are remoŽed at each stage before2


Source: Androulakis, Ioannis (Yannis) - Biomedical Engineering Department & Department of Chemical and Biochemical Engineering, Rutgers University


Collections: Engineering; Biology and Medicine