Biochemical Conversion<br />Hydrolysis, Saccharification, Fermentation
Simultaneous Saccharification & Fermentation
Source: US DOE
Sequential Hydrolysis & Fermentation
Here are two proposed methods of improving the process of converting lignin cellulosic feedstocks into ethanol. In simultaneous scarification and fermentation, you combine the C5 and C6 sugars into fermentation in a single process. At this point they're done separately. In sequential hydrolysis and fermentation, the hydrolysis and fermentation steps are combined, thus reducing a step in the process and making it more efficient.