Economic combinative solvent and catalytic dewaxing process employing methylisopropyl ketone as the solvent and a silicate-based catalyst

Patent · Tue Nov 11 04:00:00 EST 1986

OSTI ID:6973746

Stem, S C

This patent describes a process for the combinative dewaxing of a lubricating oil having a wax content which comprises: (a) contacting a waxy lubricating oil with a solvent comprising a ketone and an aromatic hydrocarbon selected from the group consisting of benzene, toluene, xylene and cumene in a solvent dewaxing zone, at solvent dewaxing conditions. This produces a partially dewaxed lubricating oil containing the ketone and the aromatic hydrocarbon and a slack wax stream containing hard wax, soft wax containing lubricating oil therewith, ketone, and aromatic hydrocarbon; (b) passing the partially dewaxed lubricating oil and slack wax stream to a first separation zone, and separating therein the partially dewaxed lubricating oil from the slack wax stream; (c) removing the ketone and the aromatic hydrocarbon from the partially dewaxed lubricating oil and contacting the partially dewaxed lubricating oil with a dewaxing catalyst, in a catalytic dewaxing zone, at catalytic dewaxing conditions, to produce a dewaxed lubricating oil; (d) treating, in a second dewaxing zone, the slack wax stream to separate the hard wax from the soft wax containing lubricating oil and the ketone solvent and the aromatic hydrocarbon from the slack wax stream; (e) recycling at least a portion of the ketone and aromatic hydrocarbon from step (d) to the solvent dewaxing zone of step (a) or the second dewaxing zone of step (d); and (f) passing the soft wax containing lubricating oil to a catalytic dewaxing zone to convert the soft wax and to thereby increase the produced quantity of lubricating oil. The improvement described here consists of use of the use of methylisopropyl ketone as the solvent ketone in the solvent dewaxing zone of step (a).

• Assignee: Shell Oil Co., Houston, TX
• Patent Number(s): US 4622130
• OSTI ID: 6973746
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKYL RADICALS
ALKYLATED AROMATICS
AROMATICS
BENZENE
CATALYSTS
CUMENE
DEWAXING
EXTRACTION
HYDROCARBONS
ISOPROPYL RADICALS
KETONES
LUBRICANTS
LUBRICATING OILS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
RADICALS
RECYCLING
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SOLVENTS
TOLUENE
WAXES
XYLENES