Processes and apparatuses for removing mercaptans from a feed stream

Inactive Publication Date: 2015-02-05
UOP LLC
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Benefits of technology

The patent text describes processes and apparatuses for removing mercaptans from feed streams. The technical effect of these processes and apparatuses is that they can oxidize mercaptans to disulfides, which can then be separated from the spent solvent and further processed. This can help to reduce the amount of mercaptans in the final product.

Problems solved by technology

This will raise the sulfur content of the treated hydrocarbon stream and may be totally unacceptable.
This polymeric material causes decreased extraction efficiency, caustic carry over, increased reentry sulfur, and level control problems.
Ultimately, this causes problems with downstream units by producing off-specification feed than can spend guard beds and neutralize expensive acidic catalysts by titrating their acid sites with caustic.

Method used

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  • Processes and apparatuses for removing mercaptans from a feed stream
  • Processes and apparatuses for removing mercaptans from a feed stream

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Embodiment Construction

[0011]The following detailed description is merely exemplary in nature and is not intended to limit the processes and apparatuses for removing mercaptans from feed streams. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background or brief summary, or in the following detailed description.

[0012]Most distillate hydrocarbon streams produced from crude oil contain some amount of sulfur in one form or another unless these streams have been subjected to extensive sulfur removal procedures such as hydrotreating. Often a major amount of this sulfur is present in the form of mercaptans. Mercaptan sulfur content must be reduced in the hydrocarbon distillate stream in order to meet certain product specifications such as a limitation on the total sulfur content of a product. It may also be desirable to remove mercaptan compounds from a hydrocarbon stream for the purpose of eliminating the rather malodorous mercaptan...

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Abstract

Processes and apparatuses for removing mercaptans from feed streams are provided. In one embodiment, a process for removing mercaptans from a feed stream includes extracting mercaptans and a polymeric precursor from the feed stream with a caustic solvent to form a polymeric precursor rich spent caustic solvent. The polymeric precursor rich spent caustic solvent is contacted with a polymeric precursor-deficient hydrocarbon stream in a multistage vessel and the polymeric precursor is extracted from the polymeric precursor rich spent caustic solvent to form a treated spent caustic solvent. The process contacts the treated spent caustic solvent with oxygen and oxidizes the mercaptans to disulfides to form an oxidized caustic solvent stream. The process includes separating the oxidized caustic solvent stream into an offgas stream, a disulfide stream, and a caustic solvent stream.

Description

TECHNICAL FIELD[0001]The technical field generally relates hydrocarbon processing apparatuses and processes for removing mercaptans from hydrocarbon feed streams, and more particularly relates to processes and apparatuses for removing polymeric precursors from mercaptan solvent streams.BACKGROUND[0002]The extraction of mercaptans from hydrocarbon streams is widely practiced in the petroleum refining industry. A basic mercaptan extraction process passes a hydrocarbon feed stream through an extraction column countercurrent to a descending stream of lean aqueous alkaline solution normally referred to as caustic. The treated product is removed from the top of the extraction column. A mercaptan-containing caustic solution referred to as a rich caustic solution is removed from the bottom of the extraction column and passed into an oxidation zone in admixture with air. An oxidation catalyst dissolved in the caustic solution promotes the oxidation of the extracted mercaptans to disulfide co...

Claims

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Application Information

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IPC IPC(8): C10G19/08
CPCC10G19/08C10G19/02
Inventor TRUCKO, JESSY E.LARICCHIA, LUIGITERTEL, JONATHAN A.
Owner UOP LLC
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