Using Glycerol on Vegetable Oil

[Soupstone]

 I've a big black bucket that normally gets all the overspill and dregs put in it and the times came to empty it. It's been there for weeks so is well settled and just getting skimmed.

 Theres traces of petrol in it and biodiesel from running off a couple of litres now and again after settling (I water wash so no soaps)

 As I'm not going to heat it to dewater (due to the petrol, theres enough in there to smell it), I'm planning to put in the glycerol from my last batch and give it a good mix before allowing to settle and drain off the glyc again.

 Thoughts are that if you do a glyc prewash whilst processing poorer oil for bio, it should help here too.

  Was wondering if there are any forseeable problems with this? Is there any real benefit in doing so? Or is it just a waste of time.

 
 

[Julian]

I don't Glycerin wash, so can't help on that front, but I've processed oil/whites containing petrol satisfactorily.  I heated and bubbled in a Burco type tank to try and evaporate off the petrol and then processed.  I've no idea of the percentage petrol, probably not much, but it still smelt when it when into the processor.

[Soupstone]

 Well thats it done, glyc dropped, I'll get some in the car tomorrow.

 Suppose theres no real way to gauge whether it's a successful pretreatment for veg running or not, unless the car breaks down. 

[K.H]

Ive got a few bottles where i have added cold liquid glyc to manky oil just to see what happens,i just shook it well to see if it would work cold,its separated out with clear oil on top.
Thats as far as ive got,i could test the ph tomorrow to see if any NaOH left in has transferred into the oil?

[Soupstone]

 Sounds a good idea, I use koh and dont demeth so I'm think worse case scenario is there would have been some tiny conversion.

 Just done a 10/90 on it, 7ml dropout so considering theres 30% bio in there it doesnt appear to have made a difference.

[Keef]

You could heat the glyc right up before introducing it. That's got to help a bit hasn't it?

[K.H]

You could heat the glyc right up before introducing it. That's got to help a bit hasn't it?

I was just seeing if it would work cold,i know its easier to handle warm but i just wondered if it made any other difference?
(if it works) i was thinking along the lines of adding a bit of glyc to the cubies as i collect them

[Soupstone]

 I'd got the idea from a post by someone on VOD (I'm thinking nathanrobo? apologies if it wasn't) who said they had used glyc before on oil and it seemed to improve it.

 

[Glycer-rides]

Glyc washes work well on wvo. I've just tried one cold, as the oil doesn't need to be used for months.
 
Doesn't really work cold, largely an emulsion is formed, but I wanted to save the heating cost, pre-prepared...like you do.

Furtive sample in the microwave and it separates out as normal.

I have drained 10L into a cubie and will observe if 'proper separation' occurs over the next few weeks. I suspect not but there's nowt to loose.
Otherwise, I will take it up to 40C and pump about for an hour.

[K.H]

This was the original bottle just after shaking



And this is it after a week or two



So i guess if i was running wvo and bio it would be worthwhile doing this,taking the good oil off the top and bio-ing the rest,the oil in the settled sample was PH7,so neutral

[Keef]

Not wishing to be an old stick-in-the-glyc but unless you ran a control sample, you don't know that it wouldn't have settled to clear oil on top anyway do you?

That said, I'm a fan of the hot glyc wash having seen it work wonders to some really skanky oil.

[K.H]

The 20 lt cubie it came out of is still a whitish horrible mix with no clear oil on top

[Keef]

That's answered that one then

[Soupstone]

  Ran off 5 litres yesterday then took a sample.

 Bit cloudy, so left overnight and theres glyc at the bottom this morning. I'll run off another litre or 2 and take another sample.