The Rectisol process uses methanol as wash solvent. The methanol has many benefits, is globally available and is a low-cost washing agent. Furthermore, methanol is chemically and thermally stable and will not change its behavior and structure over a long service life. The Rectisol wash unit operates at temperatures below 0°C. To lower the feed gas temperatures, it is cooled against cold-product streams before entering the absorber tower. At the absorber tower, CO2 and H2S/COS are removed. The CO2 content of the purified gas is adjusted to a specific requirement, which can be from 5 vppm up to 5 mol%. Sulfur components like H2S and COS can be removed.
