Catalyst support screens pressure

Measure amount ol lost capacity Coked catalyst High-pressure boiler leaks Condenser tube leaks Plugged seal legs Improperly installed catalyst support screens... 

Keep O2 levels in flue gas at about 1%. Excess O2 will form sulfuric acid when mixed with sulfur and moisture in cataiyst beds. The H2SO4 disintegrates the catalyst. Low conversion and increased pressure drop result. The acid may also attack the catalyst support screens. 

The next step is to characterize the resistances offered by the porous catalyst bed and support screens. Several correlations relating the pressure drop through porous beds and velocity and bed characteristics are available. We select an Ergun equation6 to represent the resistance of catalyst bed ... 

Damage to catalyst and reduced conversion can be a consequence of many other factors besides lost activity carbon deposits, leaking condenser tubes, damaged support screens, sulfuric acid formation, operation at the sulfur dew point. These problems are, however, invariably associated with increasing pressure drop. 

Bosch and co-workers devised laboratory reactors to operate at high pressure and temperature in a recycle mode. These test reactors had the essential characteristics of potential industrial reactors and were used by Mittasch and co-workers to screen some 20,000 samples as candidate catalysts. The results led to the identification of an iron-containing mineral that is similar to today s industrial catalysts. The researchers recognized the need for porous catalytic materials and materials with more than one component, today identified as the support, the catalyticaHy active component, and the promoter. Today s technology for catalyst testing has become more efficient because much of the test equipment is automated, and the analysis of products and catalysts is much faster and more accurate. 

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