Processes for the conversion of mixed oxygenates feedstocks to hydrocarbon fuels

Abstract

A method for forming a desired hydrocarbon fuel product from a mixed oxygenate feedstock by utilizing chemical processes to form ketones from the oxygenate feed, upgrade the ketones, recycle selected upgraded ketones through the upgrading process to obtain a desired intermediate and hydrogenating the desired intermediate to obtain the desired hydrocarbon fuel product. In various alternative configurations and embodiments this can be accomplished in a number of ways, and originate in a number of different positions and occasions.

What is claimed is: 
     
         1 . A method for forming a desired hydrocarbon fuel product from a mixed oxygenate feed comprising the steps of:
 forming ketones from the mixed oxygenate feedstock by passing the mixed oxygenate feedstock over a preselected catalyst under preselected conditions;   upgrading the ketones by reacting the ketones under preselected conditions;   recycling selected upgraded ketones through the upgrading process to obtain a desired intermediate; and   hydrogenating the desired intermediate to obtain the desired hydrocarbon fuel product.   
     
     
         2 . The method of  claim 1  wherein the mixed oxygenate feedstock includes alcohols, aldehydes, esters, and carboxylic acids. 
     
     
         3 . The method of  claim 1  wherein the ketones are C 2n−1  ketones. 
     
     
         4 . The method of  claim 1  wherein the forming of ketones includes passing the mixed oxygenate feedstock over a catalyst selected from the group consisting of 0.1% Pd—ZnO—ZrO 2  and 0.5% Pd—ZnO. 
     
     
         5 . The method of  claim 1  wherein the step of upgrading ketones includes passing the feedstock over a catalyst selected from the group consisting of 0.1% Pd—ZnO—ZrO 2  and 0.5% Pd—ZnO. 
     
     
         6 . The method of  claim 4  wherein the feedstock is passed at a weight hourly space velocity between 0.69 to 0.15 hr −1 . 
     
     
         7 . The method of  claim 4  wherein the reaction temperature at which the feedstock is passed over the catalyst is between 340° C. to 370° C. 
     
     
         8 . The method of  claim 1  wherein hydrogen gas generated in-situ through the formation of acetone is used in the hydrogenation step. 
     
     
         9 . The method of  claim 1  wherein the upgrading step includes dimerization over a catalyst selected from the group consisting of MgO—Al 2 O 3  and 0.01% to 1% Pd—MgO—Al 2 O 3 . 
     
     
         10 . The method of  claim 9  wherein the dimerization is performed by condensation chemistry. 
     
     
         11 . The method of  claim 1  wherein the upgrading steps includes aromatization using an acid catalyst. 
     
     
         12 . The method of  claim 1  wherein the upgrading step includes trimerization of smaller ketones over a catalyst selected from the group consisting of MgO—Al 2 O 3  and 0.01% to 1% Pd—MgO—Al 2 O 3 . 
     
     
         13 . The method of  claim 1  further comprising the step of performing a hydrodeoxygenation process to form alkanes, isoalkanes and cycloalkanes. 
     
     
         14 . The method of  claim 13  wherein the hydrodeoxygenation process includes passing C 9-15  cyclic and linear ketone mixtures over MgO—Al 2 O 3 , using a nickel-based hydrogenation catalyst.