can I buy the 72 hr sub pass from pvg airport?

It can be bought at the ticket counter of the PVG subway station. I remember the station is between T1 and t2, and there are many signs to get you there.

You can take subway line 2 and transfer to line 9 at Central Avenue. Then, get off at Caohejing Hi-Tech Park and leave from Exit 4. Walk west for about 5 minutes and turn right, walk for 5-10 minutes, you will see your hotel.