Production of partially refined waste glycerol

A process of producing partially refined waste glycerol by refining crude glycerol containing organic impurities, said process comprising:

• subjecting crude glycerol to a hydrophobic solvent to produce a mixture of crude glycerol and hydrophobic solvent;
• separating the mixture of crude glycerol and hydrophobic solvent to produce a deoiled (DO) glycerol and a phase containing hydrophobic solvent and organic impurities;
• drying said DO glycerol to produce a deoiled and dewatered (DOW) glycerol;
• subjecting a polar solvent to said DOW glycerol to produce a mixture of polar solvent and DOW glycerol and precipitating a salt from the mixture of polar solvent and DOW glycerol;
• and separating the mixture of polar solvent and DOW glycerol into a light phase containing a deoiled, dewatered and desalted (DOWS) glycerol and the polar solvent and a heavy phase containing the salt, wherein said process further comprises:
• partially evaporating about 75 percent of said DOW glycerol as a glycerol distillate without salt;
• recovering a remaining portion of said DOW glycerol in an evaporation discharge bottom;
• and adding the polar solvent to said evaporation discharge bottom to precipitate salt and create a deoiled, dewatered and desalted (DOWS) glycerol.