Apparatus to concentrate and purify alcohol

An apparatus for the concentration and purification of alcohol comprising:

• a countercurrent flow extractor having a top, a middle and a bottom, and including a distributor at said bottom and a propane solvent supply line at said top disposed within said extractor, wherein said propane solvent supply line is configured to function as a heat exchanger for sending propane solvent in one of a supercritical and pseudocritical condition from above to the distributor at said bottom,
• a feed line of aqueous solution of alcohol at said middle, a heavy liquid drawing line at said bottom and a light liquid drawing line at said top;
• a propane solvent distillation tower having a tower top and a tower bottom, said distillation tower connected with said light liquid drawing line and having a propane solvent drawing line at the tower top and a concentrated alcohol drawing line at the tower bottom;
• and
• a connecting line to connect said propane solvent drawing line with said propane solvent supply line of said countercurrent flow extractor through a booster pump and the tower bottom.
• said propane solvent supply line being configured in the form of a helical coil, wherein the number of windings per unit axial length of said coil above said alcohol feed line is greater than the number of windings per unit axial length of said coil below said alcohol feed line.