Production of bio-based liquefied petroleum gas

A method of producing liquefied petroleum gas comprising:

• (a) producing a dehydration feed stream comprising ethanol and isopropanol by microbial fermentation of a gaseous substrate comprising CO, CO2, CH4, or any mixture thereof, wherein the dehydration feed stream has a water content of less than 30 wt %;
• (b) contacting, in a dehydration reactor, the dehydration feed stream with a dehydration catalyst to produce a first reactor effluent stream comprising ethylene and propylene;
• (c) separating a propylene stream from the first reactor effluent stream and contacting the remainder in a dimerization reactor with a dimerization catalyst to produce a second reactor effluent stream comprising butene;
• and
• (d) contacting, in a hydrogenation reactor, the separated propylene stream and the second reactor effluent stream and hydrogen with a hydrogenation catalyst to produce a product stream comprising butane and propane.