We will now recover our methylene chloride solvent for reuse and distill the P2P. Use a 5000ml round-bottom vessel and distill over the methylene chloride from 39 to 60癈. Return the solvent to it's container and continue until there is only about 2000ml of P2P left in the vessel. Add boiling stones and vacuum distill over the remnants of the methylene chloride and water until it is clear that only P2P is left. Using a clean receiver and fresh boiling stones, distill over the P2P at 105-115癈. Do not distill at a temperature lower than 105癈 or the P2P will carry contaminants over with it, the contaminants being darker colored. P2P is a clear, pale-yellow liquid that smells like cat piss. P2P will auto- oxidize over a period of weeks if left at room temperature, so put it in the freezer until ready for use.
One can use toluene to extract the P2P from the water, but it must be vacuum-distilled and the separation will be to the top instead of the bottom like methylene chloride. It takes about the same amount of time to separate as when using methylene chloride.