Part of the problem of trying to find
VG is that the USP spec name is Glycerin USP, not vegetable glycerin. Once upon a time there were quite a few sources of glycerin, animal, chemical etc. These days there are tons of it being produced everyday. It is a byproduct of the burgeoning biofuel industry.
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In Iowa Falls, Iowa, Cargill built a 30-million-pound per year glycerin refinery next to its 37.5 MMgy biodiesel plant.
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This is interesting:
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In May, Ashland Inc. and Cargill Inc. announced intentions to form a joint venture stand-alone company to develop and produce many different chemical products from renewable resources like glycerin. Manufacturing of biobased propylene glycol will be the first line of focus for the joint venture, beginning with a 65,000 metric ton per year plant in Europe with a specific location yet to be determined. In July, Ashland and Cargill announced a technology licensing agreement with Davy Process Technology Ltd., a Johnson Matthey Co., which owns a highly efficient vapor-phase hydrogenation technology for use in the manufacturing of propylene glycol from glycerin
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