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Records with Keyword: Olefins
Modeling of Oxidative Coupling of Methane for Manufacture of Olefins—Part I: CFD Simulations
Tahyná B. Fontoura, Normando J. C. De Jesus, José Carlos Pinto
January 5, 2024 (v1)
Keywords: Computational Fluid Dynamics, fixed-bed reactors, heat and mass transfer, Olefins, oxidative coupling of methane
This paper presents a comprehensive computational fluid dynamics (CFD) model for describing the oxidative coupling of methane (OCM) carried out in fixed-bed reactors for olefin production. Initially, a single pellet model was developed and implemented to describe the heat and mass transfer within the pellet and between the gaseous and solid phases. Subsequently, sensitivity analyses were performed to assess the impact of pellet arrangement and feed conditions on the heat and mass transfer rates, subsequently affecting concentration and temperature profiles. As indicated by the simulations, a high ethylene content could be obtained with the increase in the CH4/O2 ratio, aligning well with previous experimental studies. Furthermore, it was observed that pellet arrangement can significantly affect the reactor performance. Additionally, the behavior of temperature and concentration in the gaseous and solid phases can be very different, such that pseudo-homogeneous modeling approaches shoul... [more]
Closing of Carbon Cycle by Waste Gasification for Circular Economy Implementation in Poland
Aleksander Sobolewski, Tomasz Chmielniak, Joanna Bigda, Tomasz Billig, Rafał Fryza, Józef Popowicz
February 27, 2023 (v1)
Keywords: carbon transition, chemical industry, chemical recycling, circular carbon economy, gasification, Olefins, plastic, scenario analysis, waste
Domestic coal and waste resources, which are valuable sources of carbon, can support efforts to transform a linear economy into a circular carbon economy. Their use, as an alternative to conventional, imported fossil resources (crude oil, natural gas) for chemical production, provides an opportunity for Poland to solve problems related to competitiveness, security of supply, and sustainable development in various industries. This is important for Poland because it can provide it with a long-term perspective of economic growth and development, taking into account global trends (e.g., the Paris Agreement) and EU legislation. The article presents a concept to support the transformation from linear toward a circular carbon economy under Polish conditions. The carried-out analyses showed that coal, RDF, and plastic waste fuels can be a valuable source of raw material for the development of the chemical industry in Poland. Due to the assumed availability of plastic waste and the loss of carb... [more]
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