Several proprietary processes have been developed based on the hot carbonate system with an activator or catalyst. These activators increase the performance of the hot PC system by increasing the reaction rates both in the absorber and the stripper. In general, these processes also decrease corrosion in the system. The following are some of the proprietary processes for hot potassium carbonate:
Benfield: Several activators
Girdler: Alkanolamine activators
Catacarb; Alkanolamine and/or borate activators
Giammarco-Vetrocoke: Arsenic and other activators
