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Gasoline Hydrodesulfurization and Membrane Units for Mercaptan Sulfur Reduction

A technology for hydrodesulfurization and mercaptans, which is applied in the fields of hydrotreating process, membrane, membrane technology, etc., and can solve the problems of blockage of heat exchangers and flow pipes, etc.

Active Publication Date: 2015-12-09
CHEM RES & LICENSING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 Units for Mercaptan Sulfur Reduction
  • Gasoline Hydrodesulfurization and Membrane Units for Mercaptan Sulfur Reduction
  • Gasoline Hydrodesulfurization and Membrane Units for Mercaptan Sulfur Reduction

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Embodiment Construction

[0030] As used herein, "recombinant mercaptans" means: mercaptans that are not in the feed to the process, but H produced by hydrogenation of sulfur-containing compounds in the process 2 Mercaptans of the reaction products of S with olefins in the feed. Thus, the recombinant mercaptans need not be identical to those destroyed by the hydrodesulfurization of the first part of the process of the invention, although they may be. The catalytic distillation hydrodesulfurization process of the present invention is believed to decompose substantially all of the mercaptans in the feed, while the small amounts of mercaptans observed in the product stream are typically recombinant mercaptans. While the catalytic distillation reaction is superior to prior art direct hydrogenation for mercaptan removal, the dynamic system of catalytic distillation allows sufficient time for some undesirable recombination reactions to occur. Thus, in embodiments disclosed herein, a catalytic distillation h...

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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] Embodiments disclosed herein relate generally to methods for reducing sulfur content in gasoline range hydrocarbons. More specifically, embodiments disclosed herein relate to hydrodesulfurization processes that include one or more membrane separation systems to selectively reduce the concentration of hydrogen sulfide in a select portion of the process. More specifically, embodiments disclosed herein relate to hydrodesulfurization processes that can reduce the formation of recombinant mercaptans through the use of membrane separation systems. Background technique [0002] Petroleum distillate streams contain a variety of organic chemical components. Typically, these streams are defined by their boiling range, which determines composition. The processing of these streams also affects composition. For example, products from catalytic cracking or thermal cracking processes contain high concentrations of olefinic materials as well as saturated materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02C10G35/04B01D61/00C10G45/00
CPCC10G65/04B01D61/362B01D2317/022C10G67/02C10G2300/104C10G2300/1044C10G2300/202C10G2300/207C10G2300/4087C10G2300/4093C10G2400/02C10L1/04
Inventor 加里·G·波德巴拉克雷蒙德·查芬
Owner CHEM RES & LICENSING CO
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