Naphtha hydroprocessing with mercaptan removal

a technology of mercaptan removal and hydroprocessing, which is applied in the field of hydroprocessing of naphtha with removal of mercaptan from product, can solve the problems of increased production costs of high octane fuels, loss of desirable molecules contributing to desirable octane, and further loss of desirable molecules contributing to high octan

Inactive Publication Date: 2005-12-29
EXXON RES & ENG CO
View PDF9 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] It has been discovered that a naphtha feed can be hydrotreated and mercaptans removed from the hydrotreated naphtha without the need for a further hydrotreatment step and with improved octane value and yield. Accordingly, the present invention comprises a process for removing C5+ mercaptans from a hydrotreated naphtha which comprises:

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.
Naphtha is first hydrotreated which results in some octane loss.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The feedstocks used in the present process comprise petroleum fractions boiling in the gasoline boiling range. Such feeds include fluid catalytically cracked (FCC) naphthas, steam cracked naphthas and coker naphthas boiling from about 65° F. to 480° F. (18° C. to 221° C.) as determined by ASTM D-86. Such naphthas include light cracked naphthas, intermediate cracked naphthas, heavy cracked naphthas and full range naphthas. Naphthas typically contain paraffins, olefins, naphthenes and aromatics as well as heteroatom species containing nitrogen and sulfur. Olefin contents of naphthas can range up to 60 wt. %, based on naphtha with typical olefin contents in the range from 5 to 40 wt. %. Sulfur contents of naphthas may range from 50 to greater than 5000 ppmw, based on naphtha. Nitrogen contents for these feeds are typically less than 500 ppmw. Olefin, nitrogen and sulfur contents may be determined by standard analytical techniques.

[0022] With regard to olefin and sulfur contents...

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
pressuresaaaaaaaaaa
temperaturesaaaaaaaaaa
pressuresaaaaaaaaaa
Login to view more

Abstract

This invention relates to the hydroprocessing of naphtha with removal of mercaptan from product. Naphtha feedstock is hydrotreated and hydrocracked. Sulfur-containing contaminants, notably C5+ recombinant mercaptans, are then selectively removed from the hydrocracked naphtha by selective extraction or adsorption.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims benefit of U.S. Provisional Patent Application Ser. No. 60 / 582,112 filed Jun. 23, 2004.FIELD OF THE INVENTION [0002] This invention relates to the hydroprocessing of naphtha with removal of mercaptan from product. More particularly, naphtha feedstock is hydrotreated and hydrocracked. Sulfur-containing contaminants are then selectively removed from the naphtha. BACKGROUND OF THE INVENTION [0003] 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 by 2004 with possible further reductions mandated in the future. The feedstocks for motor gasoline are typically catalytically cracked naphthas that contain substantial amounts of sulfur and olefins. [0004] A common method for reducing the sulfur content of feedstocks...

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): C10G19/02C10G25/00C10G45/02C10G47/00C10G47/02C10G61/04C10G61/06C10G63/04C10G65/12C10G67/02C10G69/02
CPCC10G45/02C10G47/00C10G61/04C10G2400/02C10G63/04C10G65/12C10G61/06
Inventor DAVIS, TIMOTHY J.HILBERT, TIMOTHY L.ELLIS, EDWARD S.GREELEY, JOHN P.
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