Gasoline hydrodesulfurization and membrane unit to reduce mercaptan type sulfur

A hydrodesulfurization and mercaptan technology, applied in the direction of hydroprocessing process, membrane, membrane technology, etc., can solve problems such as blockage of heat exchangers and flow pipes

Active Publication Date: 2012-12-19
CHEM RES & LICENSING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although not discussed in relation to the high temperatures required, vaporization of the FCC stream can lead to plugging of heat exchangers and flowlines due to polymerization of olefins, as described in US Patent 4,397,739

Method used

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  • Gasoline hydrodesulfurization and membrane unit to reduce mercaptan type sulfur
  • Gasoline hydrodesulfurization and membrane unit to reduce mercaptan type sulfur
  • Gasoline hydrodesulfurization and membrane unit to reduce mercaptan type sulfur

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Embodiment Construction

[0030] As used herein, "recombinant mercaptan" refers to not the mercaptan in the feed of this process, but the H produced by the hydrogenation of sulfur-containing compounds in this process 2 Mercaptans are the reaction products of S and olefins in the feed. Therefore, the recombinant mercaptans need not be the same as those destroyed by the hydrodesulfurization of the first part of the process of the invention, although they may be the same. It is believed that the catalytic distillation hydrodesulfurization process of the present invention basically decomposes all mercaptans in the feed, and the small amounts of mercaptans observed in the product stream are usually recombinant mercaptans. Although the catalytic distillation reaction is superior to the prior art direct hydrogenation for removing mercaptans, the dynamic system of catalytic distillation allows sufficient time for some undesired recombination reactions to occur. Therefore, in the embodiments disclosed herein, th...

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Abstract

A process for the hydrodesulfurization of gasoline is disclosed, the process including: feeding (1) a cracked naphtha containing mercaptans and other organic sulfur compounds and (2) hydrogen to a first hydrodesulfurization reactor containing one or more beds of a hydrodesulfurization catalyst; contacting sulfur compounds comprising the other organic sulfur compounds in the cracked naphtha with hydrogen in the presence of a hydrodesulfurization catalyst to convert a portion of the other organic sulfur compounds to hydrogen sulfide; withdrawing from the hydrodesulfurization reactor an effluent comprising hydrocarbons and hydrogen sulfide. The effluent from the hydrodesulfurization reactor is fed to a membrane separation system containing a membrane for partitioning the hydrocarbons from the hydrogen sulfide. For example, the membrane may be selective to hydrogen sulfide, to separate a permeate fraction comprising hydrogen sulfide from a residue fraction comprising the hydrocarbons.

Description

Technical field [0001] The embodiments disclosed herein generally relate to methods for reducing the sulfur content in gasoline range hydrocarbons. More specifically, the disclosed embodiments of the present invention relate to a hydrodesulfurization process that includes one or more membrane separation systems to selectively reduce the concentration of hydrogen sulfide in a selection portion of the process. More specifically, the disclosed embodiments of the present invention relate to a hydrodesulfurization process that can reduce the formation of recombinant mercaptans by using a membrane separation system. Background technique [0002] The petroleum distillation stream contains a variety of organic chemical components. Generally, these streams are defined by their boiling range, which determines the composition. The processing of these streams also affects the composition. For example, products from catalytic cracking or thermal cracking processes contain high concentratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02C10G35/04B01D61/00C10G45/00
CPCB01D2317/022C10G65/04C10G2300/207C10G2300/104C10G2400/02C10L1/04C10G45/00C10G2300/4093B01D61/00C10G2300/202C10G67/02C10G2300/4087B01D61/362C10L1/06C10G35/04C10G2300/1044
Inventor 加里·G·波德巴拉克雷蒙德·查芬
Owner CHEM RES & LICENSING CO
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