... it is prepared commercially by dehydration of pentose sugars obtained from cornstalks and corncobs, husks of oat and peanut, and ... used as a solvent in petrochemical refining to extract dienes (which are used to make synthetic rubber) from other hydrocarbons. Furfural, as well ... by themselves or in together with phenol, acetone, or urea to make solid resins. Such resins are used in making fiberglass, ...