Phosphorus Oxychloride Synthesis question

Aug 2016
Can anyone give some advise on the POCI3 synthesis? Some seem very simple, like:
2 PCl3 + O2 → 2 POCl3
But what is the ( 2 ) ? and how is this actually done? A supply of Oxygen and an inert reaction flask with the Phosphorus trichloride?
And :
PCl5 + H2O → POCl3 + 2 HCl
How do you isolate the POCI3 from the HCI?
I apologize for my inexperience and i appreciate any help anyone has to offer.