TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The process further involves using at least one of the fraction comprising di-tertiary alkyl glycerol and tri-tertiary alkyl glycerol and the fraction comprising the fatty acid alkyl esters to form a bio-diesel fuel or a bio-diesel fuel additive. The process further involves combining at least a portion of the fraction comprising di-tertiary alkyl glycerol and tri-tertiary alkyl glycerol and at least a portion of the fraction comprising the fatty acid alkyl esters to form a bio-diesel fuel or a bio-diesel fuel additive. The contacting the tertiary alkyl ether and the separating the alcohol and iso-olefin are conducted concurrently in a catalytic distillation reactor system. The process further involves feeding at least one of water and a water equivalent to the decomposition reaction zone. The process further involves feeding a carbohydrate to the trans-esterification reaction zone. The contacting the alcohol and separating the trans-esterification product are conducted concurrently in a catalytic distillation reactor system. Preferred Components: The tertiary alkyl ether comprises at least one of methyl tertiary butyl ether, ethyl tertiary butyl ether, tertiary amyl methyl ether, and tertiary amyl ethyl ether (preferably methyl tertiary butyl ether); the alcohol comprises at least one of methanol and ethanol (preferably methanol); and the iso-olefin comprises at least one of isobutylene and iso-amylene (preferably isobutylene). The fraction comprising the iso-olefin has a purity of at least 99.5 wt.%. The decomposition catalyst comprises at least one of a heterogeneous decomposition catalyst, and/or a homogeneous decomposition catalyst. The vegetable oil comprises at least one of canola oil and corn oil. The trans-esterification catalyst comprises at least one of a heterogeneous decomposition catalyst, and/or a homogeneous decomposition catalyst. The etherification catalyst comprises at least one of a heterogeneous decomposition catalyst, and/or a homogeneous decomposition catalyst. EXAMPLE - No suitable example given.