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Chemical Conversion

Converting Acetic Acid to Ethanol

The resulting acetic acid from the fermentation process is converted to an intermediate product–ethyl acetate–and then reacted with hydrogen to make an alcohol. With this process, the alcohol produced is ethanol. The needed hydrogen can be produced in a variety of ways and we are investigating steam reforming in this project. Another method, gasification, may be more important for commercial scale production.

Steam Reforming

In this method, steam and natural gas are combined at elevated temperature and pressure to produce hydrogen. This technology is well developed and efficient so that natural gas usage is minimized. It is also the most common way to produce hydrogen industrially today.

Gasification

In this process, the hydrogen is created using high temperatures to gasify the poplar lignin residues produced during pre-treatment. By combining the fermentation process with gasification about 2/3 of the energy in the alcohol comes from the sugar stream and 1/3 comes from the lignin stream in the form of hydrogen.

Tanks and pipes where acetic acid is converted to alcohol
After fermentation acetic acid is chemically converted to an alcohol.
Washington State University