Applications of Molecular Simulation in the Oil and Gas by Bernard Tavitian

By Bernard Tavitian

Molecular simulation is an rising know-how for identifying the homes of many structures which are of curiosity to the oil and gasoline undefined, and extra typically to the chemical undefined. according to a universally approved theoretical historical past, molecular simulation debts for definitely the right constitution of molecules in comparing their interactions. benefiting from the provision of strong pcs at reasonable fee, molecular simulation is now offering trustworthy predictions in lots of situations the place classical equipment (such as equations of country or workforce contribution tools) have constrained prediction services. this can be rather worthy for designing procedures concerning poisonous elements, severe strain stipulations, or adsorption selectivity in microporous adsorbents. Molecular simulation furthermore presents an in depth realizing of approach habit. The authors are famous specialists in Monte Carlo simulation recommendations, which they use to deal with equilibrium houses. This e-book provides those concepts in adequate aspect for readers to appreciate how simulation works, and describes many purposes for industrially correct difficulties. The publication is essentially devoted to chemical engineers who're now not but conversant with molecular simulation innovations. moreover, experts in molecular simulation can be attracted to the big scope of purposes offered (including fluid homes, fluid section equilibria, adsorption in zeolites, etc.).
Content:
entrance subject
• desk of Contents
• 1. advent
2. fundamentals of Molecular Simulation
three. Fluid section Equilibria and Fluid homes
four. Adsorption
• five. end and views
Appendix
• References
Index

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Example text

E. the chemical potential of every species of the liquid phase) must fluctuate. On the other hand, the number of moles in the vapour phase fluctuates (it cannot be fixed, because it 2. ) and thus the associated intensive variable - the chemical potential in the vapour phase - is fixed. e. for a very long simulation. This is the essential difference between a pseudo-ensemble and a true statistical ensemble. 23 Specifications of the Bubble point pseudo-ensemble. In order to simulate bubble points, existing methods are based on chemical potential estimations in the liquid phase by Widom test insertions (which may be using CBMC or reservoir bias if needed).

However, care must be taken that first order equivalence requires a different constant kbend (see Appendix 1). C. Torsion Energy Torsion energy UtoBis related to the dihedral angle cp (Fig. 14), which is defined from the coordinates of four successive atoms. 46) n=O The series comprises three or four terms so that the torsion potential exhibits several minima between 0 and 360" [Jorgensen and Madura, 19841. A formally equivalent form of Eq. 47) n=O x where the torsion angle is defined differently from the dihedral angle cp, differing by 180" (Fig.

Two in the case of stretching, three in bending and four in torsion. A. Stretching Energy The stretching energy Us, is the potential energy associated with the variation of bond length I around its mean value 1,. Therefore it involves two neighbouring atoms. e. 43) where kstr is the stiffness of the bond. At normal temperatures (say up to 700 K), this term is often neglected because the related vibrations are of small amplitude and simulations are sufficiently representative if bond length is set to the mean value I,,.

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