Development of a Full CO2 Capture Process Based on the Rectisol Wash Technology
The Rectisol wash process is one of the most popular technologies for sour gas removal, especially in coal based on chemical processes. However, its CO2 capture rate is limited to 60 70% because of high energy consumption. This paper develops a full CO2 capture process based on Rectisol wash technologies, with all CO2 captured by appropriate energy consumption. In the process, the stripping N2 tower in the conventional process is replaced by a five stage flash process. This avoids CO2 dilution of tail gas by stripping N2. The CO2 capture rate is increased to 96.8% For modeling and simulation, properties of the process are provided by CPA, PSRK, and PC SAFT methods. Because the process is at a nonideal condition, their binary interactions and calculation routes are revised referring to the DECHEMA database. To show the strengths of the full CO2 capture process, it is compared to a Rectisol wash process on exergy consumption and exergy loss for capturing a unit amount of CO2. Exergy consumption is just one.