NOVELTY - Propylene glycol production involves performing hydrogenolysis reaction in an adiabatic fixed bed reactor (1) in liquid phase, where effluent is removed from the bottom of reactor. The removed effluent is cooled and put in a flash separator vessel (2) for removing a stream containing hydrogen and light non-condensable compounds from top stream (21). The top current is provided in a recycle compressor (3) for compressing contents of the stream. The liquid effluent is provided in a primary fractionation tower (4) for discharging water stream including mild polar compounds.    USE - Method for producing propylene glycol from biodiesel glycerol (claimed).    ADVANTAGE - The propylene glycol production method enables to produce propylene glycol with high purity.    DETAILED DESCRIPTION - Propylene glycol production involves performing hydrogenolysis reaction in an adiabatic fixed bed reactor in liquid phase, where effluent is removed from bottom of the reactor. The removed effluent is cooled and put in a flash separator vessel for removing a stream containing hydrogen and light non-condensable compounds from top stream. The top current is provided in a recycle compressor, which compresses contents of the stream. The liquid effluent from the flash separator vessel is provided in a primary fractionation tower for discharging water stream including mild polar compounds such as methanol, ethanol, n-propanol and isopropanol. The latter current from the primary fractionation tower is provided in another tower to remove unreacted glycerin and other heavy products in form of third current formed during hydrogenolysis reaction. The third water current is introduced in a purification tower (6), which removes impurities such as ethylene glycol, 1,3-propylene glycol and a small content of heavy compounds.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart for producing propylene glycol from biodiesel glycerol.    Adiabatic fixed bed reactor (1)    Flash separator vessel (2)    Recycle compressor (3)    Primary fractionation tower (4)    Purification tower (6)    Top stream (21)