What is merox unit in refinery?
The merox unit is a proprietary UOP technology that selectively sweetens petroleum products by oxidizing the foul-smelling mercaptans into the sweeter disulfides which remain in the product, leaving the total sulfur content the same.
What is merox treater?
Merox is an acronym for ‘mercaptan oxidation’, a well-established process to remove mercaptans from refined products such as kerosene and jet fuel, to meet the regulatory requirements for reduced sulfur levels in aviation fuel.
What are mercaptans in oil?
Mercaptans are a common contaminant in many hydrocarbon streams, including crude oil and refined products. Mercaptans or thiols are organosulfur compounds that cause odor issues, can increase corrosivity, contribute to instability, and make it difficult to meet product specifications.
What are mercaptans chemistry?
Mercaptans are the organic components of hydrocarbons with sulfur; they also have a bad smell and corrosive properties in pipeline transmission. Therefore, if mercaptans are in high concentration in natural gas, these must be removed to reduce the value to an acceptable limit.
What is the meaning of mercaptans?
What is the formula of methyl mercaptan?
CH4SMethanethiol / Formula
How do you treat mercaptans?
One option, extraction, dissolves the disulfides in caustic and removes them. The other option, sweetening, leaves the converted disulfides in the product. Extraction removes sulfur, sweetening just removes the mercaptan odor.
How are mercaptans made?
HOW IT IS MADE. Methyl mercaptan is made by the direct reaction between methanol (methyl alcohol; CH3OH) and hydrogen sulfide gas (H2S). The hydroxyl group (-OH) from the alcohol combines with one hydrogen from hydrogen sulfide to form water, leaving the methyl mercaptan behind as the major product.
What is mercaptan Sulphur?
Mercaptan sulphur is SH bonded with an alkyl or aryl group and carbon, and the general formula is R-SH or C-SH, where R represents the alkyl or aryl group, and C represents carbon. These organic compounds are also known as thiols because of the strong bond between the thiolate group and mercury compounds.
How much mercaptan is added to propane?
Although other odorants may be used, the one most commonly used is ethyl mercaptan, which is added at the minimum rate of approximately one pound per 10,000 gallons of propane. should be performed before doing a sniff test: • Protect yourself by wearing the proper PPE. Only vent a small amount of liquid propane.
Why mercaptans are removed?
How mercaptans affect petroleum products?
Mercaptans are undesirable components in finished petroleum products as they adversely affect their quality. These sulfur compounds are removed by the Merox process which consists in the oxidation of mercaptans. For that purpose, the mercaptans are extracted and then oxidized by excess air to form alkyl disulfides.
What is the Merox process for sweetening jet fuel or kerosene?
Conventional Merox for sweetening jet fuel or kerosene. The conventional Merox process for the removal of mercaptans (i.e., sweetening) of jet fuel or kerosene is a one-step process. The mercaptan oxidation reaction takes place in an alkaline environment as the feedstock jet fuel or kerosene, mixed with compressed air,…
What is a Merox unit?
The merox unit is a proprietary UOP technology that selectively sweetens petroleum products by oxidizing the foul-smelling mercaptans into the sweeter disulfides which remain in the product, leaving the total sulfur content the same. The process is sometimes known as a sweetening process and is much cheaper to install than a hydrotreater,…
How does the sweetened LPG enter and exit the Merox unit?
The sweetened LPG exits the tower and flows through: a caustic settler vessel to remove any entrained caustic, a water wash vessel to further remove any residual entrained caustic and a vessel containing a bed of rock salt to remove any entrained water. The dry sweetened LPG exits the Merox unit.
What is a Merox reactor?
The Merox reactor is a vertical vessel containing a bed of charcoal granules that have been impregnated with the UOP catalyst. The charcoal granules may be impregnated with the catalyst in situ or they may be purchased from UOP as pre-impregnated with the catalyst.