Type
Fuels Caustic Processes
Process
Fuel Processes
Abbreviation

Caustic treatment is used to upgrade a wide range of Liquid Fractions from LPG to Diesel Fuels and Heating Oils. As the Caustic Solution (and often a Catalyst) mixes with the Hydrocarbon Feed it either extracts or sweetens Mercaptans, depending on the Process used.

However, the combination of the Hydrocarbon and Mercaptan Rich Caustic also forms a very stable Emulsion that is difficult to Separate, causing significant quantities of Caustic Carryover in the Product. This results in off-specification Products due to haze or elevated sodium concentration and loss of Caustic. In many cases the entrained Caustic is fed to Processes where Sodium is a Poison to the Catalyst.

Because the Emulsion is so stable, Knock-Out Drums, Sand Filters and Packed Vessels are not able to efficiently separate the Caustic Emulsion from the Hydrocarbon Streams. High efficiency Phase Separators such as Liquid/Liquid Coalescers reliably meet ‘clear and bright’ Product specification and Sodium levels downstream. Filter Elements are employed to reduce suspended Solids to improve the efficiency and life of the Liquid/Liquid Coalescer.

Example of Fuels Caustic Processes are:

  • UOP Merox™ Process
  • Merichem Napfining™ Process
  • Merichem Mericat Processes
Link
https://www.pall.co.in/en/oil-gas/refining/refinery-caustic-treatment.html
System Info

Updated by
UserPic  Kokel, Nicolas
Updated
11/28/2022 11:56 AM
Added
11/27/2022 6:35 PM
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https://www.pall.co.in/en/oil-gas/refining/refinery-caustic-treatment.html A Representative Caustic Extraction Process. Many Other Caustic Treating Processes Exist.