TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The SGSP's (specifically gluten) are denatured before separation, specifically using Lewis acids, preferably ferric salts, especially ferric chloride (FeCl3). The denatured SGSP's are then precipitated with a base and removed, specifically by nanofiltration, membrane filtration, osmosis and/or reverse osmosis methods. The obtained alcohol is concentrated by osmosis and/or reverse osmosis methods. The water obtained as permeate is recycled to the process cycle. Alternatively, the SGSP's are removed by membrane filtration using a membrane having a molecular weight cut-off of less than 10000 Daltons, the recovered water preferably being recycled.Preferred Procedure: Three overall bioalcohol production procedures are claimed, involving the following stages:(a) (a) mashing the biomass, (b) removing particulate and/or suspended sticky proteins by separation and/or enzymatic cleavage methods, (c) adding a Lewis acid, (d) heating the mash to 70-100 degreesC, (f) adding base to precipitate the denatured proteins, removing the precipitated proteins by clarification, centrifugation and/or filtration, (g) adding enzymes (preferably yeasts) for fluidization and saccharification, (h) separating the yeasts after the fermentation and (i) thermally separating the alcohol; or(b) stages (a) - (g) as above, followed by: (h) transferring the obtained sugar solution to a working vessel coupled with a nanofiltration unit, (i) adding water, (j) removing the sugar solution via the nanofiltration membrane, (k) subjecting the obtained sugar-containing permeate to reverse osmosis for water separation, (l) subjecting the concentrated sugar solution to enzymatic fermentation, (m) recycling the water to the process cycle and (n) thermally separating the alcohol; or(c) stages (a) - (h) as above (except that the enzyme addition step (g) is carried out between steps (b) and (c), i.e. before addition of the Lewis acid), followed by: (i) transferring the obtained solution to a working vessel and carrying out nanofiltration and/or reverse osmosis with low retention of alcohol, (j) adding water to rinse the alcohol through the membrane, (k) transferring alcohol-containing permeate to a membrane filtration unit with high retention of alcohol, (l) enriching the alcohol by removal of water and (m) thermally separating the alcohol.