Calculate the enthalpy in GJ/h of the feed stream of methanol.
Dimethyl ether (DME) synthesis provides a simple prototype of many petrochemical processes. Ten tonnes (10,000 kg) per hour of methanol are fed at 25°C. The entire process operates at roughly 10 bar. It is 50% converted to DME and water at 250°C. The reactor effluent is cooled to 75°C and sent to a distillation column where 99% of the entering DME exits the top with 1% of the entering methanol and no water. This DME product stream is cooled to 45°C. The bottoms of the first column are sent to a second column where 99% of the entering methanol exits the top at 136°C, along with all the DME and 1% of the entering water, and is recycled. The bottoms of the second column exit at 179°C and are sent for wastewater treatment. Use the method of Example 3.6(b) to complete the following:
(a) Calculate the enthalpy in GJ/h of the feed stream of methanol.
Save your time - order a paper!
Get your paper written from scratch within the tight deadline. Our service is a reliable solution to all your troubles. Place an order on any task and we will take care of it. You won’t have to worry about the quality and deadlines
Order Paper Now(b) Calculate the enthalpy in GJ/h of the stream entering the first distillation column.
(c) Calculate the enthalpy in GJ/h of the DME product stream.
(d) Calculate the enthalpy in GJ/h of the methanol recycle stream.
(e) Calculate the enthalpy in GJ/h of the aqueous product stream.
(f) Calculate the energy balance in GJ/h of the entire process. Does the process involve a net energy need or surplus?
