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Biodiesel => Chemistry and process => Topic started by: nigelb on December 10, 2013, 06:44:47 PM

Title: Venturi or diffuser
Post by: nigelb on December 10, 2013, 06:44:47 PM: What's the best way to de-water?

Is it with the venturi going full tilt or using a diffuser?
Title: Re: Venturi or diffuser
Post by: Jamesrl on December 10, 2013, 07:09:38 PM: My personal preference is a diffuser.

I find it quicker, I dry at 70c so with a 30min settling period after drying the temperature is just right to go straight into the first stage of conversion.
Title: Re: Venturi or diffuser
Post by: nigelb on December 10, 2013, 07:21:12 PM: Is the 30min settling period just about lowering the tempearture or does it have other benefits?
Title: Re: Venturi or diffuser
Post by: Jamesrl on December 10, 2013, 09:20:24 PM: Quote from: nigelb on December 10, 2013, 07:21:12 PM
Is the 30min settling period just about lowering the tempearture or does it have other benefits?

As I use a separate drying tank the settling period allows BCBs to sink before transfer, the temperature I don't worry about, I'll add methoxide anywhere between 60 and 80c.
Title: Re: Venturi or diffuser
Post by: willbuild on December 10, 2013, 09:33:50 PM: I also add the metoxide between 60 and 75c and have been wandering if 75c was to hot as the methanol might start to evaporate out of the mixture? I realise that any that does evaporate would condense and fall back in but it never hurts to ask.
Title: Re: Venturi or diffuser
Post by: Jamesrl on December 10, 2013, 09:53:14 PM: If you have a condenser and sealed vapour system, as you should have on a GL, you might get as much as an eggcup full condense out so don't worry.