DB Robinson’s AMSIM version 2013.1 is a specialized process simulator that simulates the removal of Hydrogen Sulfide (H2S), Carbon Dioxide (CO2) and Mercaptans (RSHs) from natural gas and Liquefied Petroleum Gas (LPG) streams using amine or physical solvent processing systems. It has a distillation column model in which there is a rigorous, non-equilibrium stage model. Used in conjunction with the Peng-Robinson equation of state for physical equilibrium calculations, the mass transfer rate-based tray model expresses the degree to which physical and chemical equilibrium is attained in terms of individual component tray efficiencies.
AMSIM is the appropriate tool to simulate current practices in amine absorption. The fundamental bases of the models in AMSIM allows it to predict acid gas removal over a wider range of inlet conditions than current PRO/II, with a full range of process configurations, solvent types and concentrations. AMSIM also allows mixed amines, mixtures of amines and mixtures of amines with physical solvents, capabilities not currently available in PRO/II.
The AMSIM unit operation model is completely self-contained and communicates with PRO/II only through the streams that cross the envelope containing the AMSIM sub-flowsheet.
Description of Technology
AMSIM is a flowsheet simulator, like PRO/II, but with limited options for configuration, restricted chemical components and thermodynamic methods. AMSIM allows configuration of standard amine and physical solvent processes for treatment of sour gases. AMSIM’s differentiating technologies are in the calculation of equilibrium K-values for VLE, LLE and VLLE processes, enthalpies and component tray efficiencies which account for mass transfer limitations and chemical equilibrium. The tray efficiencies are formulated similarly, but not the same as Murphree efficiencies, as used currently in PRO/II.
The K-values are calculated by either the traditional Kent-Eisenberg or more recent Li-Mather methods. AMSIM provides its own chemical reaction constants and Henry’s Law coefficients. In calculating apparent K-values, AMSIM solves a number of non-linear equations to describe the chemical and phase (physical) equilibria, electro-neutrality and the mass balance of electrolyte species in the aqueous phase. A modified Peng-Robinson equation of state is used for vapor phase fugacity coefficient calculations.
Related Topics
AMSIM
V2013.1 - Main Window
AMSIM V2013.1 - Minimum Requirements
AMSIM V2013.1 - Chemical Components