NOVELTY - Producing a low metal, low water biomass-derived pyrolysis oil, comprises: (a) contacting a metal- and water-containing biomass-derived pyrolysis oil with an acidic ion-exchange resin having sulfonic acid groups (14) to produce a low metal, water-containing biomass-derived pyrolysis oil and a spent ion-exchange resin; (b) removing the low metal, water-containing biomass-derived pyrolysis oil from the spent ion-exchange resin (16); and (c) distilling the low metal, water-containing biomass-derived pyrolysis oil.    USE - The method is useful for producing low metal, low water biomass-derived pyrolysis oil (claimed), which is used as biofuel.    ADVANTAGE - The method: provides low metal, low water biomass-derived pyrolysis oil having enhanced storage stability, high energy density and improved thermal stability; and simplifies processing, reduce material and disposal costs by regenerating and recycling the acidic ion-exchange resin and ion-exchange regenerants.    DETAILED DESCRIPTION - Producing a low metal, low water biomass-derived pyrolysis oil, comprises either: (a) contacting a metal- and water-containing biomass-derived pyrolysis oil with an acidic ion-exchange resin having sulfonic acid groups (14) to produce a low metal, water-containing biomass-derived pyrolysis oil and a spent ion-exchange resin, (b) removing the low metal, water-containing biomass-derived pyrolysis oil from the spent ion-exchange resin (16), and (c) distilling the low metal, water-containing biomass-derived pyrolysis oil; step (a) and (b) as above per se, (c1) producing a low metal, low water biomass-derived pyrolysis oil by distilling the low-metal, water-containing biomass-derived pyrolysis oil, and (d1) regenerating the spent ion-exchange resin (400) to produce a regenerated acidic ion-exchange resin by (i) washing the spent ion-exchange resin with an alcohol ion-exchange regenerant, and (ii) after washing, recharging the spent ion-exchange resin with an acidic ion-exchange regenerant and then removing the acidic ion-exchange regenerant from the regenerated ion-exchange resin; or step (a), (b) and (c1) as above per se, (d2) recovering the low metal, low water biomass-derived pyrolysis oil, (e2) contacting the spent ion-exchange resin with a first and a second ion-exchange regenerant to produce a regenerated acidic ion-exchange resin, (f2) recovering and recycling the regenerated acidic ion-exchange resin, and (g2) recovering and recycling the first ion-exchange regenerant and/or the second ion-exchange regenerant; and (a3) distilling at a temperature less than 100 degrees C a low metal, water-containing biomass-derived pyrolysis oil to produce low metal, low water biomass-derived pyrolysis oil and a distillation product, and (b3) removing and recovering the distillation product from the low metal, low water biomass-derived pyrolysis oil, where the step of distilling comprises using a distillation method including azeotropic distillation, vacuum distillation or gas-assisted distillation. An INDEPENDENT CLAIM is also included for a low metal, low water biomass-derived pyrolysis oil produced by the process comprising: contacting a metal- and water-containing biomass-derived pyrolysis oil with an acidic ion-exchange resin having sulfonic acid groups to produce a low metal, water-containing biomass-derived pyrolysis oil and a spent ion-exchange resin; removing the low metal, water-containing biomass-derived pyrolysis oil from the spent ion-exchange resin; and distilling the low metal, water-containing biomass-derived pyrolysis oil.    DESCRIPTION OF DRAWING(S) - The figure shows a flow diagram of a method for producing low metal, low water biomass-derived pyrolysis oil, and regenerating and reusing an ion-exchange resin and regenerants.    Providing metal-and water-containing biomass-derived pyrolysis oil (12)    Contacting metal-and water-containing biomass-derived pyrolysis oil with acidic ion-exchange resin having sulfonic acid groups (14)    Removing low metal, water-containing biomass-derived pyrolysis oil from spent ion-exchange resin (16)    Regenerating spent ion-exchange resin (400)    Removing residual low metal, water-containing biomass-derived pyrolysis oil from spent ion-exchange resin (424)