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In this paper, Fractional crystallization process is used to sep. organic salts and inorganic salts of salt solution by 1,3-propanediol fermentation broth electrodialysis desalination, and then mother liquor is desalted by electrodialysis for second time to recover the 1,3-propanediol.The yield of 1,3-propanediol is increased from 95% to 98%.

Huagong Sheji Tongxun

Study on the desalination process of 1,3-propanediol fermentation broth by nanofiltration membrane

Author: Luo, Ji-an

The concentration of PDO in 1,3-propanediol (PDO) fermentation broth is 7%∼10%, and the water content is 82%∼85%.In addition, it also contains 2%∼3% salt, mainly divalent sodium succinate and sodium sulfate.In addition, there is a small amount of sodium acetate.The conventional desalination process is electrodialysis desalination, but the ion exchange membrane is easy to be polluted.This paper attempts to study the desalination process of PDO fermentation broth by nanofiltration membrane, Several nanofiltration membranes with different specifications were selected to desalt PDO fermentation broth.The results showed that DK nanofiltration membrane of GE had the highest rejection rate of divalent salt in PDO fermentation broth, but the desalted liquor still could not meet the downstream extraction requirements.

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