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We are processing reduced crude oil coming out from CDU bottoms (35 API). The feed to the coker has a typical API of around 15 to 17.5. The chamber is operated at 2.2 to 2.3 kg/cm2g and the furnace coil O/L temp maintained at 498 deg C. The recycle ratio is maintained at around 0.9-1.
Now we want to increase Naphtha and c3/c4 yields, which are 8% (95% volatility 110 deg C) and 4% respectively. Please suggest which way to approach.
 
Answers
03/02/2009 A: Santanu Bhar, BRPL, s_bhar@brpl.co.in
Increase your MF top temperature by 2 deg C (at a step of 0.5 deg C). At constant pr this should help. Your Kersene/GO fraction will be a bit heavier.
09/11/2007 A: Marcello Ferrara, ITW SrL, mferrara@itw.it
We performed a pilot plant test with a new technology which achieved a yield increase of 4% as an absolute value, of which 2% is LPG, 1,5% is gasoline, 0,5% is diesel.