TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Plant: In the distillation plant, the crude glycerin is heated by hot water, where coil is located in the heat exchanger (16). The alkaline product must be alkali metal hydroxides, preferably sodium hydroxide. The static mixer (41) has a pH controller. The column of dehydration (1) is connected directly to a barometer of the main capacitor (25). The residues of the column of dehydration (1) are heated with steam in the heater (7) and are recycled to the column of dehydration (1) through the pump of movement (29). The extracting pump (30) for distilled water has at least one flow controller (FIC). The first distillation (4) is equipped with a boiler (8) and a circulation pump (31) for recycling to the first distillers (4). The condenser (9) contains indicators of flow (FI) and temperature (LI) so that the steam is transferred to the column fractional distillation (2). The first section of fractional distillation column (2) is divided into two beds which are distributed among them vapors and glycerol feeding from the first distillation (4). The second section of the fractional distillation column (2) is used for improving the quality of distilled glycerin from the first apparatus (4). The distilled glycerin contained in the lower part of the second section of the fractional column (2) is sent to the receiver (21) and is extracted by the pump distilled glycerin (37) and sent to the pre-cooler (13). The part of the distillate from the distillation column fractionated (2) is recycled through the pump (37'). The third section of the fractional distillation column (2) uses a capacitor type direct contact heat. The distilled glycerin of fractional distillation column (2) is sent to a recipient of glycerin (20) and is distributed through movement of the pump (36) with a cooling medium (12). The cooling medium (12) is cooled by a fresh water closed circuit comprising a first heat exchanger water/water (14) and a second heat exchanger water/water (17). The water is distributed by means of the treated water pump (39) and the flow of movement of the glycerol is controlled by flow controllers (FIC) while cooling the temperature is controlled by temperature controllers (TIC). The fourth section of the column split is designed for the recovery of a small amount of second-grade glycerin. The condensation of the fourth section of the column split (2) is collected in the receiver's second-grade glycerin (19) and is distributed by the pump second grade glycerin (33) through a secondary condenser (11). The secondary condenser (11) is immersed in close-cold water being controlled by level controllers (LIC). The fractional distillation column (2) vacuum is maintained through a thermocompressor (25) which in turn is associated a barometer (24). Moreover, the columns (5, 5' and 5'') always work in series. The residues of the first distillation (4) and the column split (2) are transferred through the background pump (32) and transfer the pump (34) to cylinders (3), (3') or (3''). The cylinders (3), (3') and (3'') operate alternatively, where one of them is on hold while the other two are active. The vapors obtained in cylinders (3), (3') or (3'') are condensed in the condenser (9) and sent to the column split (2). The whole process of condensation takes place with temperature controllers (TI) and flow controllers (FI). The vacuum pump (26) to restore the vacuum in the system formed by the cylinders (3), (3') or (3'') for reuse and removal of waste. The adsorption columns (5), (5') and (5'') carry the distilled glycerin bleaching. The bleached glycerin is cooled in after cooler (15) before being sent to storage facilities. The bleached glycerin has a degree of purity of 99.5%. The glycerol obtained from second grade has a grade between 96-97.6%. The second-quality glycerin represents 5% of distilled glycerin throughout the process.