申論題

Problem 9 Fill-in-the-Blank (5 points)
 Tests are made on the absorption of carbon dioxide from a carbon dioxide-air mixture in a solution containing 100 kg/m³ of caustic soda, using a 250 mm diameter tower packed to a height of 3 m with 19 mm Raschig rings. The results obtained at atmospheric pressure were: Gas rate, G' - 0.34 kg/m²•s. Liquid rate, L' = 3.94 kg/m²•s. The carbon dioxide in the inlet gas was 315 parts per million and the carbon dioxide in the exit gas was 31 parts per million. Therefore the valve of the overall gas transfer coefficient KGa is(a) 5pt