Use of high pressure to improve product quality and increase...

Details Use of high pressure to improve product quality and increase... Use of high pressure to improve product quality and increase...

C - Chemistry, Metallurgy

10

G

196/54

C10G 47/16 (2006.01) C10G 45/64 (2006.01) C10G 67/04 (2006.01)

Patent

CA 1228563

USE Of HIGH PRESSURE TO IMPROVE PRODUCT QUALITY AND INCREASE CYCLE LENGTH IN CATALYTIC LUBE DEWAXING ABSTRACT A process for preparing high quality lube base stock oil from waxy crude oil is provided which comprises separating from the waxy crude a distillate fraction thereof having an initial boiling point of at least 232°C (450°F) and a final boiling point labs than 566°C (1050°F), extracting the distillate fraction with a solvent selective for aromatic hydrocarbons to yield a raffinate from which undesirable compounds have been removed, catalytically dewaxing the raffinate in the presence of hydrogen to a pour point not higher than -1°C (+30°F) by contacting the raffinate at a temperature of 260°C to 385°C (500° to 725°F) at a hydrogen partial pressure of above 10350 kPa (1500 psia) in the absence of hydrotreating catalyst with a dewaxing catalyst comprising an aluminosilicate zeolite having a silica/alumina ratio above 12 and a constraint index of from 1 to 12 thereby forming dewaxed raffinate and lower boiling hydrocarbons, and topping the raffinate subsequent to dewaxing to remove therefrom the lower boiling hydrocarbons, thereby directly recovering substantially all of the remainder of the dewaxed raffinate, the remainder having a pour point not higher than -1°C (+30°F).

436263

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