There are several genetically engineered bacteria that have been modified to produce propanol. Formation of i-PA from branched-chain amino acids (BCAA) will be discussed in Section 5.4. Probably the most suitable way to use propanol as fuel would be in alcohol mixtures such as in isopropanol–butanol–ethanol fermentation. Propanol as a biofuel has not gained much attention, mainly because of its production cost as compared to gasoline and its energy density is not much higher than that of ethanol and is much lower compared to butanol. Currently, the main application of propanol today is for the synthesis of propylene which is an important building block in chemical industries. Isopropanol is also used as a disinfectant in pharmaceutical products or as an antifreeze. Both compounds are widely used as solvents and as intermediates in the production of various esters and amides. Propanol has two isomers: 1-propanol ( n-propanol, n-PA) and 2-propanol ( i-propanol, i-PA). Sean Michael Scully, Johann Orlygsson, in Advanced Bioprocessing for Alternative Fuels, Biobased Chemicals, and Bioproducts, 2019 5.3.1 n-Propanol and Isopropanol
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