Advice on Using Coldflow 350 - Biodiesel Winter Additive

Is your biodiesel ready for winter?

This post is to help our customers maximise the potential of Coldflow 350 and 402 in their biodiesel's.

To achieve the lowest pour points of biodiesel using Coldflow 350/402 there are a few basics which must be adhered to allow your fuel to reach low pour points which in turn will help your biodiesel run through the winter. Coldflow 350 is a biodiesel winter additive for biodiesel blends made from good quality oils like used cooking oils which contain less than 10% palm oils or heavy oils. Coldflow 402 is for biodiesel's made from 10% or more Palm oils or other heavy oils with poor pour points.

Do not add the Coldflow products to your biodiesel when it is already cold. The chemistry behind the Coldflow range poison's the sites where crystals are forming in the fuel and delays this from happening until a much lower temperature has been achieved. This will not happen if there are crystals currently formed in the fuel as they have already been formed.
For the best results when adding the Coldflow range the biodiesel must be at least 5 deg C above the pour point of the fuel. To gauge the pour point of your fuel its a simple test. Take a sample of your fuel when produced and leave in a freezer and let it begin to freeze. As the biodiesel freezes you will see clouding occur which is the beginning of the crystals forming. At this point take a temperature reading and add 5 deg C. This is the pour point of your fuel.
Now you have the optimum temperature for your biodiesel to blend the Coldflow into your fuel. To achieve the best results you must mix the Coldflow's into the fuel very thoroughly. To do this we recommend either a mixing paddle or a recirculation pump. If you are using a re-circulation pump we suggest adding the Coldflow to the fuel and re-circulating for at least 20 minutes to ensure the product has mixed into the solution.
The Coldflow range has a particle size sub 1 micron so will easily pass through 1 micron filters. We do suggest though that if you are centrifuging your biodiesel after adding the Coldflow it does have the potential to be removed. So if possible centrifuge the biodiesel before you add the Coldflow's.
Dilution rates, as mentioned earlier we suggest ascertaining the level that you biodiesel begins to gel to achieve a baseline for your fuel. We then recommend running small-scale lab tests with different dilutions to achieve a level that suits your fuel. Chemiphase recommends a dilution rate of between 3 & 5 Litres of Coldflow's per 1000 Litres of biodiesel. Try a small-scale 3:1000 Litre sample, a 4:1000 Litre sample and a 5:1000 Litre sample to see the benefits of adding a little bit more. You may find the 5 Litre per 1000 Litres of biodiesel achieves -25 deg C and may be far too high for the Uk. If this is thee case you may be happier using a 3 Litre per 1000.
If you are blending your biodiesel with mineral diesel the Coldflow range will act as a winter additive for the biodiesel and the mineral diesel.