Effect Of Feedstock Composition Research Articles

Modeling Hydrocarbon Processing

Driven by the global competition and market demand, the petroleum industry is under increasing pressure to produce clean, high-value products from low-cost feedstocks with minimum capital outlays. This has triggered an urgent need to develop robust process models capable of predicting the effects of feedstock composition, operating conditions, and catalyst properties on product quality. To develop such models, one generally splits the reaction mixture at the molecular level, examines microscopic interactions among individual reactions, and then works all the way up to the macroscopic level. Along the way one performs lumping to keep the size and complexity of the problem at bay. This is not only crucial for practical applications, but also important for fundamental understanding, since one does not want to lose sight of the forest for too many trees. This paper gives an overview of new and emerging theoretical tools for building kinetic models for hydrocarbon processing. While the emphasis is on reaction kinetics, the question of reducing hydrodynamic complexities is addressed as well.

Rheological Characterization of Feedstocks for Metal Injection Molding

Metal injection molding feedstocks are typically highly filled thermoplastic systems. In this study, the effects of feedstock composition on flow properties are examined using the capillary rheometer and the extrusion plastometer. The two techniques are also compared with respect to sensitivity to feedstock composition and their utility in predicting variations in processing performance.

A comparative study on the effects of feedstock composition on enhanced biological phosphate removal in modified activated sludge systems

Abstract The effect of acetate, propionate and peptone and waste yeast effluent on the enhanced phosphate removal capacity of bench‐scale activated systems is described. The mixed cultures which develop in such systems proved capable of sustaining enhanced phosphate accumulation even under an unfavourable influent COD/TKN ratio of 8:1. All systems achieved high levels of phosphate removal but the propionate and peptone systems outperformed the rest by a large margin. Spectacular removals upwards of 0.10 mg P (rag influent COD)‐1 were achieved. Magnesium and potassium proved vitally important to enhanced phosphate removal. The uptake and release patterns of these ions and sulphate are highlighted.

Application of a catalyst deactivation model for hydrotreating solvent refined coal feedstocks

A simple kinetic model, including a first-order catalyst deactivation rate, is applied to upgrading of coal-derived feedstocks prepared from two solvent refined coal fractions. A catalyst deactivation mechanism is proposed which involves the adsorption and surface reaction of coke precursors on catalytic active sites. The effect of feedstock composition, temperature, and pressure on kinetic parameters, and in particular, the catalyst deactivation rate, is determined.

ChemInform Abstract: ETHYLENE BY NAPHTHA CRACKING. FREE RADICALS IN ACTION

AbstractDurch Crackung von Naphtha entsteht Äthylen über freie Radikale.