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How is furfural made from agricultural materials such as corncobs and oat husks?
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heterocyclic compound
There are many different sulfur-containing heterocycles. One of the best known is thiophene, C4H4S, derivatives of which occur as plant pigments and as other natural products such as biotin.
Furfural is produced industrially by processing agricultural residuesâsuch as corncobs, oat hulls, cottonseed hulls, rice hulls, and bagasseâwhich serve as renewable raw materials.1
The manufacturing process involves the following steps:
- Digestion: The raw materials are placed in large rotary digesters and treated with dilute sulfuric acid while being steamed under pressure. This process facilitates the dehydration of carbohydrates present in the agricultural waste to yield furfural.12
- Recovery: The furfural formed during digestion is continuously removed from the mixture using steam.1
- Distillation and Purification: The resulting steam-furfural mixture is concentrated by distillation. Upon condensation, the distillate separates into two layers. The bottom layer, which contains wet furfural, is further processed through vacuum distillation to achieve a purity of at least 99 percent.1