III International Conference

PP-III-83ΔP,1mm H 2 O/m400230034200510000,3 0,4 0,5 0,6 0,7 0,8 0,9 1Peripheral speed (free area), m/sFig. 1. Hydraulic resistance ofgranular bed:1 - cylinder-shaped;2 - sphere-shaped;3 - ring-shaped ∅ = 6.6;4 - ring-shaped ∅ = 7.4;5 - ring-shaped ∅ = 8.4.The calculated value of hydraulic resistance of bed of the ring-shaped extrudates foundby the known equation II.49, p.45 [Aerov, M.E. Device with stationary granular bed /M.E. Aerov, O.M. Todes, D.A. Narinsky - StP.: Chemistry, 1979, 175 p.], is mainly definedby the factor of resistance of bed. Satisfactory convergence between experiment andcalculations for the ring-shaped extrudates of all diameters is obtained using the factors ofresistance of granular bed from particles of the cylindrical or irregular shape (the error ofcalculation does not exceed ± 30 %). It is important to notice, that use of factor of resistancefor the bed made of rings results in the significant underestimation of hydraulic resistance(from “–“ 70 up to “–“ 300 %). Possibly, it is connected with the fact that the dependence offactor of resistance recommended for ring pellets on Reynold’s criterion is based onexperiments with Raschig Rings for which internal diameter is close to external. Unlike theRaschig Rings, the pellets studied in the present work are thick-walled and their internaldiameter essentially less than external.In cooperation with the laboratory of industrial company "Alvigo-M" (Elektrogorsk, theMoscow district) the laboratory samples of shell-type palladium catalysts with the content ofpalladium 0,1 - 0,2 mass% based on ring-shape extrudates were produced and tested. Thecatalytic activity of all samples in hydrogenation of unsaturated hydrocarbons from the liquidphase obtained after pyrolysis of gaseous raw material does not concede to the industrialcatalysts with palladium content of 0.25 mass% (PK-25 and analogues).627