A long-term cooperation situated in the coke oven gas processing sector with several sequel and sub-sequel projects is described. A non-equilibrium model for chemical absorption and desorption of sour gases in columns within the ammonia-hydrogensulphide circulation scrubbing process (AS-process) is presented in detail including the electrolyte system and the enhancement factors used. In addition, the experimental validation in a pilot plant and further experiments are presented, as well as the results of additional sub-projects including foaming, membrane separation and cost optimisation.