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[ursula]

Hello all,

I am a research student based in the US. I'm hoping I can get some advice on a simple model I am building to calculate cracker margins. These are my assumptions for a notional Asian cracker yield.

100 percent naphtha feed (I could also add LPG or gasoil), producing 30 percent ethylene, 15 percent propylene, 9.7 C4s, 22.5% pygas--6% benzene. Essentially, if i have prices for the above products, I can calculate the simple cash margin (Revenue-Cost of feed).

I want to get advice here - how would one treat pygas in the margin calculation (shall i assume x percent of say, gasoline prices?). Second, what grade gasoil can a steam cracker use is - 0.5% s used?

Thanks, any advice and help would be greatly appreciated.

Ursula