Biopowered - vegetable oil and biodiesel forum

Biodiesel => Biodiesel equipment => Topic started by: Oilybloke on June 08, 2013, 05:03:07 PM

Title: Demeth.
Post by: Oilybloke on June 08, 2013, 05:03:07 PM

My new processor is taking ages to demeth......I am just demething the bio & any glyc from the 2nd stage, @ 75c via a quad core condenser with chilled water pumped through. It's taking about 8 hours, is this normal?

Title: Re: Demeth.
Post by: Head Womble on June 08, 2013, 07:27:16 PM

Take the temp up to around 85°C and it'll be a lot quicker,
but 8hrs suggests you have a problem that's more than temp related,
is your venturi sucking properly ?

Title: Re: Demeth.
Post by: Jamesrl on June 09, 2013, 04:39:19 PM

Quote from: Oilybloke on June 08, 2013, 05:03:07 PM

It's taking about 8 hours, is this normal?

WHAT! Bio only should take no more than an hour or so. There's something wrong somewhere. AS wombles say's the temp is too low, wind it up to 85 - 90C.

How far open do you have the Venturi recirc. valve.

Title: Re: Demeth.
Post by: Oilybloke on June 09, 2013, 06:12:08 PM

(http://i40.tinypic.com/2nghp55.jpg)
(http://i40.tinypic.com/33lypso.jpg)

Thank you both. The venturi at least appears to work well, it takes under a minute to suck in 20 litres of methoxide. I am opening the recirc valve fully.

Title: Re: Demeth.
Post by: Julian on June 09, 2013, 06:56:49 PM

Mine takes ages circa 3-4 hours to get to stoichiometric or just above.  Always has.  I have a four port venturi, two pumps, all be they small ones and it still takes ages.

I've just learned to live with it!