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Furfural from Oat Hulls Steamed with Sulfuric Acid in a Rotary Digester (Miner and Brownlee, Quaker Oats, US 1,735,084)
Oat hulls are a waste of the oat mill, but their pentosans turn into furfural when heated with a little acid. Miner and Brownlee blew live steam through the moist acid hulls in a turning digester, so the furfural left with the steam as fast as it formed.
Result: furfural, more than 10 % of the weight of the hulls.
Source: Miner and Brownlee, US 1,735,084 (Quaker Oats, 1929). Picture drawn by Youblob.
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