100 mol/min of butane is combusted with 60% excess air. What is the molar flow rate of air to the combustion chamber?

A 20% NaOH solution at a mass flow rate of 8572 kg / hr, to be concentrated up to 60% It is fed to the evaporator at 50C and 20 kPa. At 315 kPa as heating medium saturated water vapor is used. Overall heat transfer coefficient 1504 W / m2 Since K is;  a) The amount of steam to be used, b) Heat transfer area, c) Find the steam economy. NOTE: Take cp = 1.884 kJ / kgK for superheated steam and enthalpy for superheated steam Use the formula Hv = Hs + cp T in your calculations.

AF A single-effect evaporator operated at 100 kPa is used to concentrate 5 wt.% NaOH solution at 110°C and 200 kPa to 8 wt.%. The evaporator is heated by a saturated steam at 120 °C where the heat transfer area is 50 m². The overall heat transfer coefficient is 2000 J/m².s.K. The molar mass of NaOH is 40 kg/kg mol. a) what is the feed flow rate, the product flow rate and the generated vapor flow rate? b) what is the steam needed for this operation? c) what is the steam economy for this evaporator?

A cleaning solution for a CIP in a heat exchanger for food production is made up by combining one part phosphoric/ glycolic acid concentrate with eight parts of water. a)food technician has 10 liters of the cleaning solution already prepared and needs to increase this to 25 liters. a. How many liters of acid concentrate and how many liters of water should be added to the existing 10 liters of cleaning solution to obtain 25 liters at the correct dilution? b)The acid concentrate is a 10% solution (ie, it is 90% water, 10% acid). What is the concentration of the diluted solution?