Natural gas dehydration is a process of removing water present in natural gas stream. Dehydration of natural gas necessary to prevent the formation of gas hydrates, which can plug valves and other components of a gas pipeline. A simple natural gas dehydration system can be described as follows; Wet natural gas stream containing 1.5 mole% water is fed to the bottom section of an absorption column at a rate of 11289.35 lb-mole/day, flows upwards and is contacted with a recycled liquid solvent (triethylene glycol, TEG (molecular weight= 150.2) containing 1.36 mole% water fed from the top section of the column. The dried natural gas leaving the top section of the absorption column contains 0.2 Ib-mole % water. The water-rich TEG solvent leaves the bottom section of the column and is fed to a distillation column to remove water. The top stream of the distillation column contains only water and the bottom stream containing regenerated liquid solvent is recycled back to the absorption column. For efficient dehydration process, it is found that 37 Ibm of TEG is required for every 1.0 Ibm of water removed from the wet natural gas.

A. Draw and completely label the above process.

B. Perform the degree of freedom analysis.

C. Calculate the amount of water leaving the overhead of the distillation column. (147.1 Ibmole/day). d. Calculate the amount of TEG required (in lbmoles/day). (652.2 Ib-mole/day)

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