NOVELTY - Production of biological butanol comprises preparing fermentation substrate, carrying out fermentation, carrying out solvent rectification, and treating the waste fermented liquor; where processes for the rectification unit comprises sending fermented material into the fermentation liquor tower, taking product from side of the tower, and sending the product to the second fermentation liquor tower, taking rough solvents from the top of the tower, sending the solvent to the ethylene-propylene tower, treating the material, refining rough butanol, and refining rough ethanol.    USE - The process is useful for producing biological butanol (claimed).    ADVANTAGE - The process lowers material and energy consumptions, reduces sewage discharge, and increases market competitiveness of the biological butanol.    DETAILED DESCRIPTION - Production of biological butanol comprises preparing fermentation substrate, carrying out fermentation, carrying out solvent rectification, and treating the waste fermented liquor; where the rectification unit comprises a fermentation liquor tower, an ethylene-propylene tower, a butanol tower, an acetone tower, an aldehyde stripping tower, and an ethanol tower; and the processes for the rectification unit comprises sending fermented material into the fermentation liquor tower, taking product from side of the tower, and sending the product to the second fermentation liquor tower, taking rough solvents where the water contents are 30-80% from the top of the tower, sending the solvent to the ethylene-propylene tower for refining, treating material through the ethylene-propylene tower to form rough butanol and acetone, ethanol and water, refining the rough butanol through the butanol tower, and refining rough ethanol through the ethanol tower. An INDEPENDENT CLAIM is a device for the production of biological butanol comprising a rectification unit that comprises a fermentation liquor tower, an ethylene-propylene tower, a butanol tower, an acetone tower, an aldehyde stripping tower, and an ethanol tower; where the ethylene-propylene tower, butanol tower, acetone tower, aldehyde stripping tower, and ethanol tower are towers with filler structure or composite structure of filler and plate structures.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram of the process for producing biological butanol (Drawing includes non-English language text).