Catalytic dewaxing process

Details Catalytic dewaxing process Catalytic dewaxing process

1987-08-20

1990-05-01

Caldarola, Glenn

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

208111, C10G 4716

Patent

active

049215930

ABSTRACT:
A lubricant dewaxing process which is useful with difficult feeds, especially highly waxy feeds having paraffin contents in excess of 25 weight percent of feeds with high nitrogen levels, employs two-step dewaxing in which the first stage is carried out under relatively mild conditions to obtain extended catalyst cycle life between successive reactivations with a constant temperature for the duration of each dewaxing cycle. The second stage dewaxing is carried out under conditions which maintain the target pour point for the product with a progressively increasing temperature during each dewaxing cycle. More than one preliminary dewaxing stage may be provided in order to reduce severity in each stage with mild conditions and constant temperature being maintained in the preliminary steps. Using this process, extended catalyst cycle lives may be obtained with difficult feeds.

REFERENCES:
patent: 3528908 (1970-09-01), Bowles et al.
patent: 3723296 (1973-03-01), Hahn
patent: 4151070 (1979-04-01), Allan et al.
patent: 4292166 (1981-09-01), Gorring et al.
patent: 4597854 (1986-07-01), Penick
patent: 4668377 (1987-05-01), Chen et al.

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