Time for a transfer within Beijing Capital Airport T2 (Inter to Inter Flight, difference airline).

I have an international transfer T2 to T2 with difference airline
China Eastern Airlines (Bangkok) transfer to Hainan Airlines (Russia)

Do I have to clear customs?
Do I have to pass the immigration check?
Will my luggage be forwarded? Or must I collect the luggage?
What is the average transfer time?
Is 2.35 hours be enough time?

ps. I arrive PEK at 07:25 and my next flight is 10:00
ps. I hold Thaiand passport

Thanks