Detailed Analysis of MDEA based Gas Sweetening Process
Gas sweetening using MDEA is a well-known process in hydrocarbon industry. Several conflicting independent operating parameters such as, lean amine temperature, feed gas temperature, regenerator feed temperature and pressure, etc., are involved in the process. These parameters directly affect the performance of the absorption and regeneration process. Practically, operators have limitations in terms of varying any parameters only within certain limits and it is difficult to understand the exact relation between the dependent and the independent variables. Also, it is important to consider the simultaneous effects of different variables together on the particular objective. Hence, it is required to analyze the sweetening process to get better H2S and CO2 removal efficiency and smooth operation. The feed gas contains natural gas having 92.5% methane, 10% ethane, 2.5% hydrogen sulfide and 5% carbon dioxide. In this paper the effects of lean amine temperature and feed gas temperature are studied and their effects on various dependent variables such as sweet gas H2S content, sweet gas CO2 content, MDEA makeup, cooler duty, booster pump power, and reflux ratio are analyzed.