TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The integrated reactor system comprises a biomass conveyor, catalyst-containing pyrolysis reactor, primary product separator, primary product upgrader, and secondary product separator.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: In the method (M1): the steps of feeding a hydrocarbonaceous material to a reactor and reacting a portion of the hydrocarbon products to produce a chemical intermediate are conducted within an integrated reactor system; and the step of reacting a portion of the hydrocarbon products to produce a chemical intermediate produces byproducts, and further at least a portion of the byproducts of the chemical intermediate production are returned to the pyrolysis reactor. In the method (M1), the pyrolysis step is catalytic pyrolysis and further a benzene-rich fraction is separated from the hydrocarbon products, and is alkylated with an olefin to produce the chemical intermediate, or is oxidized to produce phenol, or is hydrogenated to produce cyclohexane. In the method (M1), the pyrolysis step is catalytic pyrolysis and further at least: a portion of one benzene-rich fraction separated from the hydrocarbon products is hydrogenated to produce cyclohexane, and at least a portion of the cyclohexane is oxidized to adipic acid; a portion of one toluene-rich fraction is separated from the hydrocarbon products, and is subjected to a disproportionation reaction to produce a xylenes-enriched product stream, or is subjected to a methylation reaction to produce a xylenes-enriched product stream; and one para-xylene-rich fraction that is derived from the hydrocarbon products is oxidized to produce terephthalic acid that, optionally is polymerized to poly(ethylene terephthalate), poly(butylene terephthalate) or poly(trimethylene terephthalate). In the method (M1), the pyrolysis step is catalytic pyrolysis and further at least a: portion of one ortho-xylene rich fraction is separated from the hydrocarbon products that is oxidized to produce phthalic anhydride; and a portion of one ethylbenzene-rich fraction that is derived from the hydrocarbon products is dehydrogenated to produce styrene that, optionally, is polymerized to polystyrene. In the method (M1), the pyrolysis step is catalytic pyrolysis and further p-xylene is produced, where the p-xylene is oxidized using pyrolysis products other than acetic acid. In the method (M2): the byproducts comprise acetone, where the acetone is fed back to the pyrolysis reactor, or the byproducts comprise hexanol and hexanoic acid, that are fed back to the pyrolysis reactor; the byproducts having hydrogen to carbon effective ratio of 0-1.67 are fed back to the pyrolysis reactor and are converted to a mixture of aromatics and olefins with a hydrogen to carbon effective value of at least 1, where the mixture of aromatics and olefins has oxygen-to-carbon atomic ratio less than 0.01. Preferred Components: The pyrolysis products comprise primary products that comprise aromatics and/or olefins. EXAMPLE - No suitable example given.