Transit Visa with 2 separate tickets

Hi, I am travelling with my family and bought 2 separate online tickets
1. Toronto (Canada) to Beijing & back to Toronto -
2. Beijing to Hyderabad( India) via Kualalumpur & back to Beijing ( via Kualalumpur)

I am reaching Beijing on 30th July -2:40Pm and leaving Beijing on Aug 1st - 01:30Am to Hyderabad(India) via Kualalumpur.
While on my return journey from Hyderabad (India) to Toronto, I am reaching Bejing again on Aug 28th - 00:20Am and leaving bejing to Toronto on Aug 30th - 4:10Pm.

My question is:
1. Are the times within 72 hours free transit?
2. Can I use 72 hour free transit twice while on my journey to Hyderabad(India) and back?
3. Am I eligible to buy separate tickets ( Toronto to Bejing, and Bejing to Hyderabad, India)?
4. For free transit, Can I present the Online ticket version for Bejing to Hyderabad leg and back? I am not sure how to get the printed ticket unless I get to Malaysian Airlines counter in Beijing.
Thanks very much in advance for your help. Any ideas?