Biodiesel Purification - Dry Wash Process

Many smaller biodiesel plants with a production capacity of up to 100.000 to per year are running water free: they are using Chemra's dry produc TREVER®|LITE RN110 to remove small amounts of catalyst, soaps and glycerol. These plants are generally using feed stocks with a low amount of free fatty acids (FFA).


One or two columns with TREVER®|LITE RN110 are already sufficient for this process step. No additional water is added to the biodiesel, some traces of water are even removed by the dry wash resin. But in this case the resin consumption is high since the capacity for glycerol and soap will determine the resin lifetime.


In order to improve the process economics, saturated TREVER®|LITE RN110 can be reused. This will increase the capacity of this process step for the removal of residual glycerol and soaps and will improve the biodiesel quality. In this case TREVER®|LITE RN110 will be regenerated with methanol after loading with glycerol and soap. It can be reused many times until it is irreversibly fouled by organic substances and has to be replaced.


This process is using 4-5 columns which are operating in a merry-go-round mode. TREVERLITE RN110 which is already saturated with the catalyst is put in front of the process and removes glycerol and soaps. These plants are generally using feed stocks with a low amount of free fatty acids (FFA).


CAUTION: Dry resins swell up to 3 times their original volume when converted into the MeOH or water form. Sufficient free space has to be given when filling the columns with dry resins to allow swelling.


Purification of Biodiesel with the Dry Wash Process (DWP)
(click to enlarge picture)

Biodiesel purification with the dry wash process (DWP)