Diesel Fuel Composition

A method comprising:

• a) providing a first mixture of oxygenates selected from the group consisting of C1-5 alcohols, C1-5 aldehydes, C1-5 ketones, C1-5 organic acids, and combinations thereof.
• b) separating and dehydrating oxygenated compounds from the first mixture to form a second mixture:
• c) partially separating C1-5 alcohols from the second mixture to form a third mixture, the third mixture including the C1-5 alcohols;
• d) synthesizing C1-5 aldehydes and/or C3-5 ketones and/or C2-5 alcohols and/or C2-5 polyols from a portion of the third mixture;
• e) forming a fourth mixture including acetals from the third mixture and the C1-5 aldehydes and/or C3-5 ketones;
• f) separating acetals from the fourth mixture;
• and
• g) blending an additive with the acetals, the additive comprising a component selected from the group consisting of C3-8 dialkyl ethers, alkylated phenols, R—NO2 , and combinations thereof where R is a aliphatic hydrocarbon with oxygenate functionality in an alpha or beta position to NO2.

A system for producing a substitute diesel blend comprising:

• a separator for removing C1-C2 alcohols along with higher volatility components such as acetone and methyl esters of acetic and formic acids as well as water and acids from a raw blend to form a concentrated blend, the raw blend including oxygenates from partial oxidation of hydrocarbon-containing gases, the concentrated blend including alcohols, ketones and/or aldehydes;
• a station for catalyzing formation of an acetal-containing blend from the concentrated blend;
• a station for removing water from the acetal-containing blend;
• and
• a station for adding additional alcohols to the acetal-containing blend;
• and
• a station blending adding an ignition enhancer and peroxide inhibitor.