NON PURIFIED GLYCEROL
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United States of America Patent
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Jul 13, 2017
app pub date -
Jun 5, 2015
filing date -
Jun 6, 2014
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Abstract
A process including the steps of: providing a glycerol rich-fraction as carbon source to a fermentation medium; fermenting the fermentation medium by means of a microorganism capable of producing propionic acid in the presence of a caustic salt to provide a fermentation broth including a propionic acid salt; and recovering propionic acid salt from the fermentation broth, wherein the glycerol rich-fraction is derived from a process including the steps of: subjecting the glycerol fraction to an evaporative crystallization step to form a distillate fraction including water, and a residue fraction including glycerol and solid salts; and subjecting the residue fraction to a salt removal step, resulting in a salt fraction and a glycerol-rich fraction. The process allows the manufacture of a propionic acid salt using a glycerol-rich carbon source without problems in down-stream processing, and without need for cost-intensive purification steps for the glycerol.
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