| (19) |
 |
|
(11) |
EP 0 181 066 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
20.07.1988 Bulletin 1988/29 |
| (43) |
Date of publication A2: |
|
14.05.1986 Bulletin 1986/20 |
| (22) |
Date of filing: 06.09.1985 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB IT NL |
| (30) |
Priority: |
29.10.1984 US 665793
|
| (71) |
Applicant: MOBIL OIL CORPORATION |
|
() |
|
|
| |
|
| (54) |
Process for dewaxing heavy distillates and residual liquids |
(57) Process for dewaxing heavy distillate and residual feed. Easily converted waxes are
partially removed in a first catalytic dewaxing step, and the resulting product is
separated to remove the light ends. The heavy liquid fraction, which contains difficult
to convert waxes, such as poly-branched or mid-methyl branched paraffin waxes, is
then introduced into a second dewaxing stage, where the liquid stream is dewaxed to
a specification pour point. The process may be implemented via double pass dewaxing
in existing units or by passing through two consecutive dewaxing units. Improvements
are due to a decoupling of temperature requirements in each reaction step and removal
of cracked products which inhibit dewaxing and accelerate aging in the second dewaxing
stage.