A gas absorber has to be designed to handle 900 m3/hr of coal gas containing 2% benzene (by volume). Coal gas enters the absorber at a temperature of 300 K containing 0.005 mole fraction of benzene and has an average molecular weight of 260. You are asked to Calculate the circulation rate of solvent per second if the column is to be operated at 1.4 times the minimum value. The equilibrium relationship is given as where, Y and X are the mole ratios of benzene to dry gas and to solvent, respectively.

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?