Water washing titrated acid method

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This is a processing method which allows the biodiesel to be water washed and dried within the processor, therefore it is ideal for those with limited space who may not have the room for separate tanks needed for conventional water washing. To work effectively there needs to be a minimal amount of soap in the biodiesel prior to washing. As such, it is best used with the two stage process with no titration

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First four washes/sulphuric-Julian

Sample during first wash/sulphuric-Julian

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Vinegar

Ok this is the method i used today,we tried universal indicator so we could tell when it changed to pH 7 as we wanted it neutral,we also tried methanol instead of IPA because the IPA we had was acidic

280 LITRE BATCH

(1) Titrate bio

(2) Titration fluid: white vinegar

(3) 25 ml of Methanol and some Universal Indicator,added 10 ml of bio shake, Green to Blue

(4) Then add the titration fluid in drips until the colour changes to green/yellow

(5) Multiply the result by the batch size to get the amount of acid needed e.g. if 0.1ml vinegar used to change colour to neutralize 10ml bio, 10ml vinegar neutralizes 1L 10x280 = 2.8L vinegar

(6) Add to 30 litres of water and mix with the bio for 25 minutes

(7) Take sample for reference

Sample taken immediately after the first wash/vinegar-KH

First wash starting to settle/vinegar-KH

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