Question: A 2 0 0 0 - m 3 vessel containing liquid methanol is being prepared for reuse. After draining, it must be purged with nitrogen

A 2000-m3 vessel containing liquid methanol is being prepared for reuse.
After draining, it must be purged with nitrogen (98% nitrogen and 2% oxygen) and then purged with air to reach a fuel composition of 0.1% of the TLV-TWA (Methanol TLVTWA=200 ppm). Use sweep-through purging. Parameters are, pressure 1atm, temperature 25 C, purging rates of 10 m3/min.
a. Establish the composition of the methanol vapor in the tank after draining.
b. What is the target fuel composition for purging with nitrogen that contains 2% oxygen?
c. Calculate the amount of nitrogen required.
d. Determine the quantity of sweep-through air required.

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