DAO from propane de-asphalting has the highest quality but lowest yield, whereas using pentane may double or triple the yield from a heavy feed, but at the expense of contamination by metals and carbon residues that shorten the life of downstream cracking catalysts.
The DAO process derived from propane de-asphalting produces the highest-quality product with the lowest output, whereas employing pentane can substantially increase yield from a heavy mixture, but this comes with the drawback of introducing metal and carbon impurities that reduce the lifespan of subsequent cracking catalysts.