Catalytic scrubbing additives

In the process, 99.8 percent ethylene, 99.5 percent oxygen, and recycle gas are directed to a vertical reactor and are contacted with the catalyst solution under slight pressure. The water evaporated during the reaction absorbs the exothermic heat evolved, and make-up water is fed as necessary to maintain the catalytic solution concentration. The reacted gases are water-scrubbed and the resulting acetaldehyde solution is fed to a distillation column. The tail gas from the scrubber is recycled to the reactor. Inerts are eliminated from the recycle gas in a bleed stream which flows to an auxiliary reactor for additional ethylene conversion. 

Over two hundred dry or wet processes have been proposed for the removal of SO2 gases. Limestone and dolomite find extensive use in many of the desulfurization processes. Activated soda is considered as an attractive and more reactive alternate to limestone. In addition to calcium and sodium based processes, ammonia based, magnesia based, organic based scrubbing systems and catalytic processes have also been proposed for SQ2 removal. Calcium based dry processes have found wide application especially in fluidized bed combustors and in... 

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