Process for the preparation of organic compounds
AssigneeShell Oil Company
InventorsSikko J. A. Boelema, Martin F. M. Post, Swan T. Sie
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Abstract
In a two-stage process for the conversion of H.sub.2 -poor syngas into hydrocarbons and oxygenates in which uncoverted syngas from the first stage product is converted in a second stage into paraffins over a Ni, Co or Ru catalyst, the H.sub.2 /CO molar ratio of the feed for the second stage is adjusted to the required value of 1.75-2.25 by blending this feed with an H.sub.2 -rich syngas with an H.sub.2 /CO molar ratio of at least above 1.75 which latter gas has been obtained by subjecting a small portion of the feed for the first stage to a high temperature (above 325.degree. C.) CO-shift.
Claims7
A two-step process for the preparation of organic compounds from a mixture of hydrogen and carbon monoxide, wherein a H.sub.2 /CO mixture having a H.sub.2 /CO molar ratio below 2.0 is divided into two portions, a larger portion A and a smaller portion B, of the same composition;
- in the first step portion A, through contact with a catalyst comprising one or more metal components having catalytic activity for the conversion of a H.sub.2 /CO mixture into hydrocarbons and/or oxygen-containing organic compounds, is converted into a reaction mixture in which the H.sub.2 /CO molar ratio (R.sub.1) is lower than 2.25;
- and portion B, through contact, together with water, at a temperature above 325.degree. C., with a catalyst having CO-shift activity, is converted into a reaction mixture in which the H.sub.2 /CO molar ratio is higher than R.sub.1 and also higher than 1.75;
- hydrogen and carbon monoxide present in the reaction product from portion A, optionally together with other components from this reaction product, are mixed with the reaction product from portion B to form a mixture having a H.sub.2 /CO molar ratio of from 1.75-2.25;
- and in the second step the mixture thus obtained is contacted with a catalyst comprising one or more metal components having activity for the conversion of a H.sub.2 /CO mixture into paraffinic hydrocarbons, which metal components have been chosen from the group formed by cobalt, nickel and ruthenium.
Dependencies are inferred from the claim text.