Hydrofining process

Patent · Tue Dec 16 04:00:00 EST 1986

OSTI ID:6772501

Hudson, C W; Markley, G E

This patent describes a hydrofining process wherein hydrogen, and a feed characterized as an admixture of hydrocarbons which contains organic sulfur, or organic nitrogen, or both, having a high end point boiling below about 370/sup 0/C and a low end boiling point above about 150/sup 0/C, and contains up to about 2 weight percent sulfur, and up to about 500 ppm nitrogen, is contacted over a hydrofining catalyst and hydrofined at hydrofining conditions inclusive of an initial temperature ranging between about 275/sup 0/C and about 450/sup 0/C. The temperature is gradually raised during the operation to maintain catalyst activity, deterioration of the feed occurring as manifested by increased discoloration of the reaction product mixture, and sulfur as hydrogen sulfide, or nitrogen as ammonia, or both, are separated from the hydrofined reaction product. The improvement described here is wherein the hydrofined product from which sulfur, or nitrogen, or both, have been removed is contacted as feed, in the presence of hydrogen, over a catalyst. The catalyst is comprised of elemental iron and one or more alkali or alkaline-earth metals components at a temperature ranging from about 225/sup 0/C to about 430/sup 0/C and hydrogen partial pressure ranging from about 0 psig to about 1000 psig sufficient to reduce the discoloration of the feed, and increase the length of the operating cycle.

• Assignee: Exxon Research and Engineering Co., Florham Park, NJ
• Patent Number(s): US 4629553
• OSTI ID: 6772501
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AMMONIA
BOILING POINTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COLORATION
CRACKING
DECOMPOSITION
DISPERSIONS
ELEMENTS
HIGH TEMPERATURE
HYDRIDES
HYDROCARBONS
HYDROCRACKING
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON COMPOUNDS
LOW PRESSURE
MEDIUM PRESSURE
MIXTURES
NITROGEN
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHYSICAL PROPERTIES
PYROLYSIS
QUANTITY RATIO
SULFIDES
SULFUR COMPOUNDS
SULFUR CONTENT
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE