Furfural, commercial production from pentosans

Furanose and pyranose, origin and definition of terms, III, 18 Furanose and pyranose rings, method of distinction in some cases, III, 103 Furfural, commercial production from pentosans, V, 288 from bagasse, IV, 296 from wood saccharification, IV, 178 —, 5-hydroxymethyl-, IV, 5, 307, 314, 336... 

Furfural is obtained commercially by mealing pentosan-rich ugricullural residues (corncobs, oat hulls, cottonseed hulls, hagasse. rice hulls) with a dilute acid and removing the furfural by steam distillation. Major industrial uses of furfuraldehyde include (1) the production of t urnns and tetrahydrofurans where the compound is an intermediate (2) Ihc solvent refining of petroleum and rosin products (3) the solvent binding of bonded phenolic products and (4) the extractive distillation of butadiene from other C4 hydrocarbons. 

Furan resin is a generic term for a thermoset resinous product that contains a heterocyclic unsaturated furan ring in its molecular structures. Pentosans from com cobs and rice hulls are the main sources for the key ingredient, furfural. Commercially, the furfural alcohol polymer is the most important. All furan resins are dark in color and have a reddish-black appearance when catalyzed to cure they become black. 

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