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A Catalyst For The Production Of Hydrocarbons By The Fischer-Tropsch Process

Patent Number: SU1819158

Inventor(s): Dry Mark Eberhard (ZA); Duvenhage Dawid Jakobus (ZA); Haan Robert De (ZA); Olivier Anthony John (ZA)

Applicant(s): Sasol Ind Pty Ltd (ZA)

Requested Patent: SU1819158

Application Number: DE19904035544 19901108

Priority Number(s): ZA19890008668 19891114

IPC Classification: B01J21/18; B01J23/74; B01J23/78; C07C1/04; C07C9/22

EC Classification: B01J21/18, C07C1/04D4, C10G2/00B2D, B01J23/755

Equivalents: AU638071, AU6652190, CA2028588, IT1242011, PL287726

Application of 13.11.1990

Priority of ---

Published: 30.05.1993 in B.I. No. 20


This invention relates to catalytic synthesis of hydrocarbons from synthesis gas. The aim of the invention is to increase the whiteness of hydrocarbons produced by the Fischer-Tropsch synthesis. For this purpose, the catalyst is suggested containing iron, copper, silicon, and potassium, and, in particular, carbon activated by steam or mineral acid. The component contents expressed as parts per 100 parts of metallic iron are as follows:

Copper (as metal) 0.5-10
Silicon (as silica) 15-30
Potassium (as oxide) 2-8
Steam or mineral acid activated carbon 2-20

The size of 50-100% of activated carbon particles ranges within 0.1-100 μm or within 850-1200 μm.

Catalyst material (I) for Fischer-Tropsch (F-T) processes contains active carbon (II). Process for the production of an Fe-based catalyst (I) comprises adding 1-80 wt.% (II) (wwith respect to amount of Fe) to one of the catalyst precursors at any stage before extrusion. (I) is useful for the low-temperature variant of the F-T process, especially as a solid-bed catalyst; amount of (II) is 1-80 (preferably 1-50, especially 1-20, e.g. 5-10) wt.% wwith respect to Fe, and (II) is uniformly distributed in (I); at least 50 (preferably at least 75, especially at least 90) wt.% of the particles of (II) are smaller than 100 microns, preferably with at least 90 wt.% smaller than 45 microns, or the same proportion is in the size range 850-1200 microns; (II) is produced from pinewood, tanniferous acacia or coconut shells, and is preactivated with steam or mineral acid.

USE/ADVANTAGE - (I) is useful as an F-T catalyst (part of main claim). A process is claimed for the production of hydrocarbon waxes with improved colour, by contacting a suitable synthesis gas with (I) in a solid-bed reactor at elevated temperature and pressure; paraffin wax obtained by this process is claimed as such. Catalyst (I) gives wax with a high Saybolt number (preferably at least 20) directly, without the need for subsequent hydrogenation.