High Quality Content by WIKIPEDIA articles! Bioseparation of 1,3-propanediol is a biochemical process for production of 1,3-propanediol. 1,3-Propanediol (hence referred to here as "PDO") is an organic chemical that can be used for various ends. In particular, PDO is polymerized with terephthalic acid to make poly(trimethylene teraphthalate) (hence referred to here as "PTT") , a polyester that has end-uses such as clothing, fibers, automobile lining, and carpeting .