with a proper calculation sheet thank you.

A packed column, 1.2m in diamcter and 9m tall, is packed with 25mm Raschig rings, and used for the vacuum distillation of a mixture of isomers of molccular mass 155kg/kmol. The mean temperature is 373K, the pressure at the top of the column is maintained at 0.13kN/m2 and the still pressure is 1.33.3kN/m2. Obtain an expression for the pressure drop on the assumption that this is not appreciably affected by the liquid flow and may be calculated using a moditied form of Carman's equation. Show that, over the range of operating pressures used, the pressure drop is approximately directly proportional to the mass rate of flow rate of vapour, and calculate the pressure drop at a vapour rate of 0.125kg/m2. The specific surface of packing, S=190m2/m3, the mean voidage of bed, e=0.71, the viscosity of vapour, =0.018mNs/m2 and the molecular volume =22.4m3/kmol