Naphtha desulfurization process

a technology of desulfurization process and naphtha, which is applied in the direction of physical/chemical process catalyst, hydrocarbon oil treatment product, hydrocarbon oil treatment, etc., can solve the problems of further loss of desirable molecules contributing to high octane, increased production cost of high octane fuels, and loss of molecules contributing to desirable octan

Inactive Publication Date: 2006-07-13
EXXON RES & ENG CO
View PDF20 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such severe hydrotreating conditions normally result in a loss of molecules contributing to desirable octane properties either by cracking to non-fuel molecules or hydrogenation of olefins to molecules having lower octane rating.
However, such adjustments result in further loss of desirable molecules contributing to high octane.
This then results in increased production costs to produce high octane fuels because of the need to boost octane through added process steps such as isomerization, blending or addition of octane boosting additives.
The use of such catalysts in a low sulfur feed may lead to catalyst deactivation with attendant loss in catalyst activity and selectivity.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Naphtha desulfurization process

Examples

Experimental program
Comparison scheme
Effect test

example

[0036] A SCANfining® pilot unit was loaded with catalyst RT-225 which is commercially available from Exxon Mobil Coporation. The RT-225 catalyst contains 4.5 wt. % MoO3 and 1.2 wt. % CoO, on an alumina support. The catalyst was in a quadralobe shape and had a catalyst size of 1.3 mm. After a preliminary drying at 399° C. (750° F.) for 3 hours, the catalyst was loaded in a pilot unit and further dried at 371° C. (700° F.) for 6 hours. The catalyst was then sulfided using a 10 vol. % H2S in H2 mixture at an initial temperature of 93° C. (200° F.) and a final temperature of 343° C. (650° F.).

[0037] The catalyst was then activated using a straight run naphtha and a heavy cat naphtha used for catalyst break-in. Two feeds were then prepared for the low sulfur and high sulfur runs. The low sulfur feed was a naphtha blend having a total sulfur content of about 30 wppm, based on feed. The high sulfur feed had a total sulfur content of about 550 wppm and was prepared by spiking a low sulfur ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle size diameteraaaaaaaaaa
pressuresaaaaaaaaaa
temperaturesaaaaaaaaaa
Login to view more

Abstract

This invention relates to a process for selectively desulfurizing naphtha. More particularly, a low sulfur naphtha feed containing less than 500 wppm sulfur is hydrodesulfurized using a hydrodesulfurization catalyst and a hydrogen treat gas containing at least about 50 vppm hydrogen sulfide followed by mercaptan removal or conversion.

Description

FIELD OF THE INVENTION [0001] This invention relates to a process for selectively desulfurizing naphtha. More particularly, a low sulfur naphtha feed is hydrodesulfurized using a hydrodesulfurization catalyst and a hydrogen treat gas containing hydrogen sulfide followed by mercaptan removal or conversion. BACKGROUND OF THE INVENTION [0002] Environmental regulations covering the sulfur content of fuels for internal combustion engines are becoming more stringent with regard to allowable sulfur in fuels. It is anticipated that motor gasoline sulfur content may need to meet a sulfur limit of 30 wppm with possible further mandated reductions. The feedstocks for motor gasoline are typically catalytically cracked naphthas, which contain substantial amounts of sulfur and olefins. [0003] A common method for reducing the sulfur content of feedstocks is by hydrotreating using catalysts that convert sulfur-containing species to hydrogen sulfide. The extent to which hydrotreating lowers the sulf...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): C10G45/00
CPCB01J23/882B01J35/002B01J35/1061B01J37/20C10G19/02C10G25/00C10G45/08C10G67/06C10G67/10C10G2400/02
Inventor ELLIS, EDWARD S.HALBERT, THOMAS R.STUNTZ, GORDON F.
Owner EXXON RES & ENG CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap