The CATACARB Process has been proven extensively for removing CO2 from ethylene oxide recycle gas. Many of the leading EO/EG producers and licensors, such as Shell Chemicals, BASF, SHARQ, and Mitsubishi, employ the CATACARB process for their CO2 removal needs. We work with the EO/EG plant licensor to fine-tune the CATACARB design for optimal economics with respect to plant layout, available utilities, and demands of the EO reaction section.
In the EO reactor, some CO2 is generated as an undesirable byproduct. The HPC process can be used to remove the CO2 from the EO recycle gas. However, the use of organic solvents (e.g., amine) or organic rate promoters of typical HPC processes is not permitted due to degradation from high oxygen content and contamination of the recycle gas.
Using a minor proportion of our non-degrading and non-volatile inorganic catalyst, the CATACARB Process has been successfully implemented in over 60 EO/EG plants. The inorganic catalyst accelerates the rate of CO2 absorption and stripping by approximately 40% over the uncatalyzed HPC process, allowing for smaller equipment sizes and lower capital expenditure. Furthermore, since the inorganic catalyst also acts as a corrosion inhibitor, extensive use of carbon steel is permitted for reduced equipment cost. It also helps prevent stress corrosion cracking from chlorides, which are sometimes found in high concentrations in EO applications.