13 3 a gas stream containing a valuable hydrocarbon mw 44 is scrubbed
13.3 A gas stream containing a valuable hydrocarbon (MW = 44) is scrubbed with a nonvolatile oil (MW=300, specific gravity =
0.90) in a tower packed with 1-inch Raschig rings. The entering gas analyzes 20 mole percent hydrocarbon with the remainder being an inert gas (MW = 29). The gas stream enters the column at 5000 lb/hr-ft2, and hydrocarbon-free oil enters the top at 10,000 lb/hr-ft. The column is 4 ft in diameter. Ninety-five
percent of the valuable hydrocarbon is to be recovered. Use the equilibrium relationship and the equations for k,a and ka given below. Estimate the height of packing required.
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