US 2003/0150776 A1Published application

Process for increasing the yield of lubricating base oil from a fischer-tropsch plant

AssigneeChevron U.S.A. Inc.

InventorsDavid R. Johnson, Christopher A. Simmons, Donald H. Mohr, Stephen J. Miller, Stephen K. Lee, William L. Schinski, Michael S. Driver

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Abstract

A process for increasing the yield of C10 plus hydrocarbon products from a Fischer-Tropsch plant which comprises the steps of (a) separating a Fischer-Tropsch product into a wax fraction and a condensate fraction; (b) dewaxing the wax fraction to produce a high boiling intermediate; (c) hydrofinishing the high boiling intermediate; (d) dehydrating the alcohols in the condensate fraction to convert them into olefins; (e) oligomerizing the olefins to form higher molecular weight hydrocarbons; (f) hydrofinishing the oligomerization mixture; and (g) and recovering a C10 plus hydrocarbon product from the hydrofinishing zone.

Claims35

Dependent claims

A process for increasing the yield of C10 plus hydrocarbon products from a Fischer-Tropsch plant which comprises:

(a) separating a feedstock comprising C5 plus Fischer-Tropsch products recovered from the Fischer-Tropsch plant into a Fischer-Tropsch wax-faction and a Fischer-Tropsch condensate fraction, wherein the Fischer-Tropsch condensate fraction contains alcohols boiling below about 400 degrees C.;
(b) dewaxing the Fischer-Tropsch wax fraction in a catalytic dewaxing zone to produce a high boiling intermediate having a lower pour point as compared to the Fischer-Tropsch wax fraction;
(c) hydrofinishing the high boiling intermediate in a hydrofinishing zone;
(d) contacting the Fischer-Tropsch condensate fraction separated in step (a) with a dehydration catalyst in a dehydration zone, whereby at least some of the alcohols present in the fraction are converted to olefins;
(e) oligomerizing the olefins in the Fischer-Tropsch condensate fraction to form a intermediate oligomerization mixture having a higher average molecular weight than the Fischer-Tropsch condensate fraction;
(f) hydrofinishing the intermediate oligomerization mixture in the hydrofinishing zone;
and
(g) recovering from the hydrofinishing zone a C10 plus hydrocarbon product.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/071,281Filed 8 Feb 2002
Published: 14 Aug 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

C10G 2/32
From carbon monoxide with hydrogen: with the use of catalysts
C10G 50/02
Production of liquid hydrocarbon mixtures from lower carbon number hydrocarbons, e.g. by oligomerisation: of hydrocarbon oils for lubricating purposes
C10G 69/126
Including at least one polymerisation or alkylation step: polymerisation, e.g. oligomerisation
C10G 69/14
Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process: plural parallel stages only