NOVELTY - Method (M1) for biorefining, comprises: (a) providing a plant-based bioglycerin (10); (b) treating the plant-based bioglycerin to provide treated plant-based bioglycerin; and (c) producing at least one derivative product (P1) from at least one of the plant-based bioglycerin or the treated plant-based bioglycerin.    USE - The method is useful for biorefining the plant-based bioglycerin to produce derivative product (claimed), value-added chemicals and biobased chemicals.    ADVANTAGE - The method: facilitates the production of energy from waste products; requires low energy; provides the derivative product with high yield, in a simple manner; is efficient in removing both the salts and other impurities from the crude plant-based bioglycerin; does not need the expensive processing equipment, as compared to conventional methods; and facilitates the regeneration and recycling of ion exchange resins, thus reducing the potential wastes associated with the process.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a method (M2) for biorefining, comprising: the steps (a) and (b) as above per se; and using waste product from the treated plant-based bioglycerin to produce energy; and    (2) a method (M3) for biorefining, comprising: providing the plant-based bioglycerin as a by-product of biodiesel production (60); treating the plant-based bioglycerin to provide treated plant-based bioglycerin by at least one of desalination treatment (12), decolorization treatment (22) or concentration treatment (32); treating the plant-based bioglycerin to provide desalinated plant-based bioglycerin using an ion exchange treatment in at least one a batch flow condition or continuous flow condition; treating the plant-based bioglycerin to provide decolorized plant-based bioglycerin using activated charcoal in at least one of a batch flow condition or continuous flow condition; treating the plant-based bioglycerin with the activated charcoal; treating the plant-based bioglycerin to provide concentrated plant-based bioglycerin using at least one of an evaporation process or distillation process in at least one of the batch flow condition or continuous flow condition; the step (c) as above per se; recovering and recycling the water, the solvent and the ion exchange resin from the desalination process; recovering the salt from the desalination process; recovering and recycling the solvent and the activated charcoal from the decolorization process; recovering and recycling the water and the solvent from the concentration process; recovering the treated plant-based bioglycerin; reducing a waste product of the treated plant-based bioglycerin, where the treated plant-based bioglycerin has a weight, and the waste product of the treated plant-based bioglycerin is less than 60% of the desalinated plant-based bioglycerin weight; producing energy from the waste product of the treated plant-based bioglycerin; functionalizing the plant-based bioglycerin and the treated plant-based bioglycerin prior to production of the derivative product (P1); and the step (c) as above per se.    DESCRIPTION OF DRAWING(S) - The figure illustrates a flow diagram of the biorefining process.    Plant-based bioglycerin (10)    Desalination treatment (12)    Decolorization treatment (22)    Concentration treatment (32)    Biodiesel production (60)