Chemical Engineering

Question The decomposition of cyclohexane to benzene and hydrogen is mass transfer limited at high temperatures. The reaction is carried out at 2 atm and 500ºC in a plug-flow...

Question Water is pumped from a valley lake to a hill-top community, high above the valley. The pipe diameter is constant and the pump is located in the middle of the pipeline. En...

Question Consider the T-S diagram of a refrigerator unit. The working flid is R-22. The refrigerator operates between a low pressure of 0.60 bar absolute (measured in the evaporat...

QuestionThe vapor pressure of water at 25°C is 3.2 kPa. Calculate the average value of heat of vaporization of water over the temperature range of 25 to 100°C.R = 8.314 JK-...

Question Beer is produced in the fermenter shown below.   Using the information on the figure, calculate the respiratory quotient, RQ, (the ratio of the moles of carbon dio...

Question A 42.0%/58.0% by volume propane/n-butane mixture is cooled from 379°C to 143°C. Find the change in enthalpy of this mixture by following the steps below. Assume i...

QuestionThe following figure illustrates the principle of a water clock, which consists of a vessel with a small opening in the bottom. Assuming that the water clock has a circular...

Question Consider a liquid film of thickness L flowing down a vertical surface as shown in the figure below. The flow is laminar and fully developed. Beginning at x = 0, the liqui...

Question A calandria (another term for a thermosyphon reboiler) is used to vaporize 5000 kg/hr chlorobenzene (1 atm pressure, 131ºC) using 65 psia saturated steam.  The ...

Question The pH values of soil samples in which different amounts of fertilizer were added are shown below. Fertilizer pH Mean s 0 7.88 ...

Question A heat exchanger is used to transfer heat from a steam stream to a chlorine gas stream. 100 kg of steam at 1 bar and 300°C enters the heat exchanger and lea...

Question Oxygen at 150K and 41.64 atm has a tabulated specific volume of 4.98 cm3/g and a specific internal energy of 1609 J/mol. Calculate the specific enthalpy of O2 in this sta...