Feedstocks are is the raw material that's used in industrial processes. Typically when most people that have heard of the term renewable chemical feedstocks usually think of crops being used to replace the feedstocks that use petroleum. A good way to know weather you should use renewable feedstocks are when they make environmental or business sense.
A well know renewable feedstock is corn, which is used by many farmers. In order to use corn as a renewable chemical feedstock it has to go through a pretty lengthy process. First the corn would be converted to what ever the product is that the person needs by using enzymes and microorganisms. Next glucose is produced from another very well known chemical feedstock usually known in the process of fermentation.
Corn is a good renewable chemical feedstock because it can produce a lot of products, like food, feed, fiber, and industrial fuels/chemicals. One of the most well know uses of corn is when it is fermented to produce ethanol. Ethanol isn't the only product that can be made from corn some others are Acetone (high value industrial solvent), Lactic Acid (commodity chemical and maybe as a raw material to make polyactates or acrylates).
https://netfiles.uiuc.edu/mcheryan/www/feedstoc.htm
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