NOVELTY - Preparing (A1) a bio-oil composition from biomass involves (a1) introducing a biomass material; (b1) pre-treating the biomass material; (c1) subjecting the treated biomass material to microwave pyrolysis in presence of a catalyst; (d1) subjecting the pyrolyzed material to catalytic reformation; (e1) subjecting the catalytically reformed material to condensation; and (f1) obtaining resultant bio-oil-containing composition.    USE - For preparing a bio-oil composition containing furfural from biomass, preferably pentosan-containing biomass (claimed) which is useful as a liquid boiler substitute green fuel or substituted for fuel oil or diesel in a number of static applications e.g. stationary engines, gas turbines, boilers and furnaces; used to prepare specialty chemicals, such as food flavorings and pharmaceuticals; and used as a phenolic replacement, and in asphalt binders (e.g. adhesives, road stabilizers); used in developing technologies as well including agrochemicals, clean fuels and biofuels, and timber treatment.    ADVANTAGE - The process produces simpler higher quality and high purity grade bio-oil composition containing furfural with great selectivity from a given biomass input, and with greater liquid percentage yield relative to starting biomass solid weight; improves the practicality of the pyrolysis option to produce bio-oil compositions that reduces the extent of downstream processing to isolate compounds of interest; and provides bio-oils having greater predictability, stability and specificity at earlier stages instead of greater reliance on improving the stability through post-conversion treatments of the bio-oils. The process is associated with cost-effective and waste-reducing and byproduct-reductive bio-oil production systems and the overall time required to prepare bio-oils is significantly reduced.    DETAILED DESCRIPTION - Preparing a bio-oil composition from biomass involves: process (A1): (a1) introducing a biomass material, (b1) pre-treating the biomass material, (c1) subjecting the treated biomass material to microwave pyrolysis in presence of a catalyst, (d1) subjecting the pyrolyzed material to catalytic reformation, (e1) subjecting the catalytically reformed material to condensation, and (f1) obtaining resultant bio-oil-containing composition; or process (A2): (a2) introducing a biomass material, (b2) pre-treating the biomass material, (c2) subjecting the treated biomass material to microwave pyrolysis in presence of a catalyst, (d2) separating solid residue and char from the pyrolyzed output to obtain remaining pyrolyzed material, (e2) subjecting the remaining pyrolyzed material to condensation, and (f2) obtaining resultant bio-oil composition, where the above steps are structured as a continuous process. An INDEPENDENT CLAIM is included for determining the yielded compositional ingredients of a bio-oil composition corresponding to a given starting biomass involving defining the initial composition of a starting biomass source; subjecting the biomass to the process (A1) for preparing bio-oil composition; analyzing the chemical content in terms of ingredients and respective amounts; comparing the resultant chemical composition content to the starting biomass composition to ascertain corresponding compositional information as to bio-oil content; and utilizing the corresponding compositional information to forecast biomass input relative to correlative bio-oil output compositional content.