Process for the conversion of a synthesis gas to hydrocarons in the presence of beta-SiC and effluent from this process

Abstract

In a process for the conversion of carbon monoxide to C 2 + hydrocarbons in the presence of hydrogen and of a catalyst comprising a metal and a support comprising silicon carbide, the support comprises more than 50% by weight of silicon carbide in the beta form. A process for the conversion of carbon monoxide to C 2 + hydrocarbons in the presence of hydrogen and of a catalyst the effluent thus obtained are also disclosed.

1 . Process for the conversion of carbon monoxide to C 2   +  hydrocarbons in the presence of hydrogen and of a catalyst comprising a metal and a support comprising silicon carbide, characterized in that the support comprises more than 50% by weight of silicon carbide in the beta form.  
     
     
         2 . Process according to  claim 1 , characterized in that the support of the catalyst comprises from 50 to 100% by weight of beta silicon carbide in the particulate state and preferably 100% of the said silicon carbide.  
     
     
         3 . Process according to  claim 1  or  2 , characterized in that the catalyst comprises at least 5% by weight of a metal from the group consisting of cobalt, iron and ruthenium.  
     
     
         4 . Process according to one of  claims 1  to  3 , characterized in that the catalyst additionally comprises a promoter chosen from the group consisting of Zr, K, Na, Mn, Sr, Cu, Cr, W, Re, Pt, Ir, Rh, Pd, Ru, Ta, V, Mo and their mixtures, preferably Mo.  
     
     
         5 . Process according to one of  claims 1  to  4 , characterized in that the beta-SiC is in the form of a powder, grains, extrudates, foam or monolith.  
     
     
         6 . Process according to one of  claims 1  to  5 , characterized in that the catalyst is used as a fixed bed, as an ebullating bed or as a slurry.  
     
     
         7 . Process according to one of  claims 1  to  6 , characterized in that it is carried out under the following operating conditions: 
 total pressure: 10 to 100 atmospheres;    reaction temperature: 160 to 250° C.;    GHSV varying from 150 to 5000 h −1 ;    H 2 /CO ratio of the starting synthesis gas of between 1.2 and 2.8.    
     
     
         8 . Process according to one of  claims 1  to  7 , characterized in that it is carried out under the following operating conditions: 
 total pressure: 20 to 50 atmospheres;    reaction temperature: 180 to 220° C.;    GHSV varying from 200 to 1000 h −1 ;    H 2 /CO ratio of the starting synthesis gas of between 1.7 and 2.3.    
     
     
         9 . Process according to one of  claims 1  to  8 , characterized in that the hydrocarbon effluent comprises more than 70 mol % of a mixture comprising from 50 to 90 mol % of C 6  to C 12  hydrocarbons and from 10 to 50 mol % of C 13  to C 24  hydrocarbons.  
     
     
         10 . Process according to one of  claims 1  to  9 , characterized in that the hydrocarbon effluent comprises at most 10 mol % of branched hydrocarbons and olefins and/or less than 2 mol % of C 1  to C 20  alcohol.  
     
     
         11 . Process according to one of  claims 1  to  9 , characterized in that, in the hydrocarbon effluent, the content of methane and of CO 2  is less than 20 mol %.  
     
     
         12 . Process for the conversion of carbon monoxide to C 2   +  hydrocarbons in the presence of hydrogen and of a catalyst, characterized in that the hydrocarbon effluent comprises more than 70 mol % of a mixture comprising from 50 to 90 mol % of C 6  to C 12  hydrocarbons and from 10 to 50 mol % of C 13  to C 24  hydrocarbons.  
     
     
         13 . Process according to  claim 12 , characterized in that the hydrocarbon effluent comprises at most 10 mol % of branched hydrocarbons and olefins and/or less than 2 mol % of C 1  to C 20  alcohol.  
     
     
         14 . Process according to  claim 12  or  13 , characterized in that, in the hydrocarbon effluent, the content of methane and of CO 2  is less than 20 mol %.  
     
     
         15 . Process according to one of  claims 12  to  14 , carried out in a fixed bed.  
     
     
         16 . C 2   +  hydrocarbon effluent comprising hydrocarbons, methane and CO 2  which comprises more than 70 mol % of a mixture comprising from 50 to 90 mol % of C 6  to C 12  hydrocarbons and from 10 to 50 mol % of C 13  to C 24  hydrocarbons.  
     
     
         17 . Hydrocarbon effluent according to  claim 16 , characterized in that the mixture comprises less than 10 mol % of corresponding olefins and less than 2 mol % of C 1  to C 20  alcohol.  
     
     
         18 . Hydrocarbon effluent according to  claim 16  or  17 , characterized in that the content of methane and of CO 2  is less than 20 mol %.