Patent ID: 8183417

Claim:
A process of purifying biologically-produced 1,3-propanediol from the fermentation broth of an organism able to produce 1,3-propanediol, comprising the steps of: (a) subjecting the fermentation broth to filtration; (b) subjecting the product of step (a) to ion exchange purification wherein anionic and cationic molecules are removed; (c) subjecting the product of step (b) to chemical reduction; and (d) subjecting the product of step (c) to a distillation procedure comprising at least two distillation columns wherein one of said distillation columns removes molecules having a boiling point exceeding the boiling point of 1,3-propanediol and the other of the distillation columns removes molecules having a boiling point below the boiling point of 1,3-propanediol.