Can I get a 72-hour visa if...

I have an initial 3 hour layover in Shanghai on my way to KL without leaving airport.

Then on a different day, I will fly from KL back to Shanghai. During this leg of the journey, I will be stopping by to visit for 2 days and then flying out from Shanghai to Vancouver on a different carrier. Tickets are confirmed in one reservation booking number. Am I eligible for the 72hr free transit here?