In my refinery there is a 15 kBPSD LSRG sweetening unit in which caustic washing procedure followed by MEROX oxidation process. In case of feed change scenario, is there any solution in terms of gas condensate sweetening by means of before mentioned facilities? If yes, what are the changes in terms of capacity, chemical consumption, and mercaptan removal efficiency? If there is any revamp, which sections need to be resized?
Answers
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06/01/2017
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
To re-rate the unit for a different feed and its contaminants, use the same design criteria as used for a new unit. Then, using normal procedures for vessel sizes and hydraulics, determine the bottlenecks to be alleviated for the new operation.
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06/01/2017
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NS Murthy, Suez, murthy.ns.ext@suez.com
Being a MEROX unit, the licensor UOP will be the right people to guide your refinery. However, pl take care of the following points. I guess LSRG is light straight run gasoline which is mostly C5s and C6s.
1. Check the boiling points of feed as designed and proposed. As long the boiling points are close enough, there should not be much of the worry.
2. Check the RVP of feed design and proposed. This will help you to set required back pr. in the unit so that there is all liquid phase.
3. Check the RSH and H2S loading in design feed and proposed. this will guide you to the recirculation rate, caustic make up, air flow, etc.
Good luck for making the best use of idle asset.
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