500 kg/hour of a mixture containing 10wt% methane and 90wt% ethane at 27°C and 1 bar is fed to a mixer. Another mixture, containing 50wt%methane and 50wt% ethane at 77°C at 1 bar, is also fed to the mixer at a flow rate of 300 kg/hr. The mixer operates at 1 bar and 227°C. Calculate the heat entering/leaving the mixer in kJ/hr. Use the sign of Q and determine if the heat is being transferred FROM or TO the mixer. The specific enthalpies of methane and ethane are given in the table below. Temperature (°C)Methane Specific Enthalpy (kJ/kg) Ethane Specific Enthalpy (kJ/kg)271199.81068.3771314.81161.52271708.91504.6

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Asked Mar 31, 2019
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500 kg/hour of a mixture containing 10wt% methane and 90wt% ethane at 27°C and 1 bar is fed to a mixer. Another mixture, containing 50wt%methane and 50wt% ethane at 77°C at 1 bar, is also fed to the mixer at a flow rate of 300 kg/hr. The mixer operates at 1 bar and 227°C. Calculate the heat entering/leaving the mixer in kJ/hr. Use the sign of Q and determine if the heat is being transferred FROM or TO the mixer. The specific enthalpies of methane and ethane are given in the table below.
 
Temperature (°C) Methane Specific Enthalpy (kJ/kg)
 
Ethane Specific Enthalpy (kJ/kg)
27 1199.8 1068.3
77 1314.8 1161.5
227 1708.9 1504.6
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Expert Answer

Step 1

The flowchart for the given process is shown below.

Here, 3 kg/h is the flowrate of the product stream and x3 is the mass fraction of methane present in this stream.

Methane is represented as CH4 and ethane as C2H6.

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Step 2

Apply total material balance on the given process as:

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Step 3

Now, apply material balance on me...

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