merox sweetening
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MEROX: Mercaptan Oxidation.
MEROX unit reduces LPG sulfur content to meet customers product specifications.
MEROX IntroductionMEROX Introduction
What does MEROX process consist of?
MEROX IntroductionMEROX Introduction
Mercaptan Sulfur Extraction SectionUtilization of caustic solution to extract mercaptans sulfur from LPG products as they are converted to mercaptides.
Caustic Regeneration SectionUtilization of catalyst and air to regenerate caustic solution as the mercaptides are converted furthermore to insoluble disulfides.
• The Merox process requires an alkaline environment which, in some of the process versions, is provided by an aqueous solution of sodium hydroxide (NaOH), a strong base, commonly referred to as caustic.
• In other versions of the process, the alkalinity is provided by ammonia, which is a weak base.
• The catalyst in some versions of the process is a water-soluble liquid. In other versions, the catalyst is impregnated onto charcoal granules.
The most common mercaptans removed are:
• Methanethiol - CH3SH [m-mercaptan]
• Ethanethiol - C2H5SH [e- mercaptan]
• 1-Propanethiol - C3H7SH [n-P mercaptan]
• 2-Propanethiol - CH3CH(SH)CH3 [2C3 mercaptan]
• Butanethiol - C4H9SH [n-butyl mercaptan]
• tert-Butyl mercaptan - C(CH3)3SH [t-butyl mercaptan]
• Pentanethiol - C5H11SH [pentyl mercaptan]
Blockage of Merox unit equipment due to salt formation
Mr. LPGH2S
SulfurSulfur Extraction Extraction
Prewash Drum
Extractor
Regenerated Caustic
Contaminated Caustic
Treated Product
San
d F
ilter
Caustic Settler
LPG
SulfurSulfur Extraction Extraction
O
X
I
D
I
Z
E
R
Process AirContaminated Air
Contaminated Caustic
Disulfide Oil
CausticHeater
Regenerated Caustic
To atmosphere
60 PSIG Steam
To Crude
Caustic RegenerationCaustic Regeneration
Disulfide Separator
VentTank
Catalyst Add. Pot
CatalystO2
NaSR+ + ½ H2O ½ RSSR + NaOH
RSSR(Disulfides)
Caustic RegenerationCaustic Regeneration
NaSR(Mercaptides)
Merox Catalyst
41
References
• [1] Treating Technology Solutions (http:/ / www. uop. com/ refining/ 1110. html)
• [2] Merox Process for Mercaptan Extraction (http:/ / www. uop. com/ objects/ 3 Extract Merox Mercap. pdf)
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