(185d) Simulation Approach for Natural Gas Sweetening Using Mixed Amines

Global warming is a major threat to people’s and animal’s lives due to the increase of greenhouse gases emissions, especially CO₂ emission. This critical issue is expensive and consume large amount of energy. The purpose of this term project is to extant an inclusive review and illustrative comparison of different amine solvents and amine mixtures available and suitable for removal of acid gas from natural gas the production specifications. A base case of amine base CO₂ removal process from a real plant is used to create a steady state simulation using Aspen HYSYS^® V9.0 process design program that can practically predict the CO₂ capture mechanism from the natural gas using DGA, MDEA+DEA and MDEA+PZ solvents. Adding piperazine improved the solubility of CO₂ in low CO₂ partial pressure associated to pure MDEA and DGA. The CO₂ loading increased with increasing CO₂ partial pressure, decreasing temperature, and increasing solvents concentration. In this study, the design models are tested for all the possible key parameters that can affect the performance of the process. Since, achieving the product specification with minimum possible energy requirement is the goal of any process plant, hence, the effect of operational parameters is investigated in terms of CO₂ content in the sweet gas and reboiler duty. Energy and cost requirements have been investigated for more rescannable comparative analysis