This report analyzes developments in bio-based 1,3 propanediol (PDO) technologies.  PDO derived from bio-based materials or processes can be converted into a number of chemical products - potentially improving the GHG profile of the process, including PTT (polytrimethylene terephthalate) and PTF (polytrimethylene furanoate), potential substitutes for conventional petrochemical polymers.  The study assesses the technical, commercial, and economic aspects of producing PDO and the corresponding downstream polymers.