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I would like experts' comments on ATF processing. We don't hydroprocess LK to produce ATF. We only change the form of sulphur compounds in an alkaline solution in presence of air. The reactions proceeds as below
2R'SH + 2RSH +O2-> 2R'SSR +2H2O.
We have a constraint that while processing light slop in crude unit we cant ATF as it results in colour deterioration of the product. Can i get some expert comments as why this happens. and whether this method of producing ATF is followed elsewhere?
 
Answers
14/09/2017 A: Virendra Kapoor, Petroleum Refining Consultants, vkkapoor9@yahoo.com
Organic nitrogen leads to color degradation as a general rule particularly in presence of air due to various reaction types at elevated temp.
05/09/2017 A: Sridhar Balakrishnan, Bharat Oman Refineries Limited , laksrid@yahoo.com
During ATF processing , do not process slops particularly cracked slops, which can cause colour deterioration and thermal stability failures . Fuel appearance will deteriorate within short period.
01/09/2017 A: Krishna Rao Pulugurti, Retired/Consultant, pkrao2012@yahoo.com
Do not process slops while processing ATF
01/09/2017 A: Dave Collings, Jacobs, dave.collings@jacobs.com
This is a classic refinery problem.
Slops must be segregated such that cracked slops from the FCC or Delayed Coker are not recycled to the crude unit. Most of the time cracked slops are routed to the Delayed Coker as quench oil.
This is why slops are separated. Slops from the crude unit, reformer, hydrocracker, and hytrotreaters are rooted to non-cracked slops and recycled to the crude unit or routed to the Delayed Coker. Slops from the Delayed Coker and FCC are routed to cracked slops and consumed at the Delayed Coker.
Certain crudes, particularly West African, can also lead to these problems.