whispy whites

[willbuild]

Made a  batch two weeks ago, de watered, glyc pre wash, 2stage no tit.  only used 5gr per litre of Noah on 1st stage, which i now know was not enough so had to do 3 stages to get a instant clear 27/3 pass. Put back the glyc and did a 5% wash. left overnite then drained and demethed.
2x 10% bubble washes,  then spray dried for 12 hrs. Did a 50/50 test this afternoon when i got back and the pic shows wispy white bits that settle between the bio and the water.
Am i right in thinking that it is mono or triglycerides.
if so what do i do to remove?

[Tony]

Looks like a good 50:50 to me.  Did you do it with hot water?

If there is a layer between bio and water then that is mono/diglycerides.  As such there's not much problem burning them in an engine, but they do love water, so any moisture will do bad things.  And there is some speculation that they cause waxing when it gets cold.

I don't stress about them being in fuel but do prefer not to see them - if you're really paranoid and have a sensitive engine then reprocess with more Meth/catalyst.

[willbuild]

there seems to be no white layer, the white wispy bits have have left wispy shape film on sides of jar. bio is clear and seperates within 5 mins on 50/50 test. so will use it on monday when i drive to london.

[nigelb]

The white wispy bits may be a by-product of the demeth stage. It appears as though the demeth stage is pretty efficient as you can get away with 2 x 10% bubble washes.

Incidentally...how long does your demth take (typically) and at what temperature is it at when it takes place?

[willbuild]

I start to re-coup at 65c and push temp to 75 80c, first hour i get a  trickle then will leave till its only a drop every 4 or 5 secs. total process 2 2and half hours.
used 17 lts of meth on this batch re couped just under 4 lts.

[nigelb]

Have you seen these wispy whites before in your 50/50's or is this the first time?

[willbuild]

1st time, mind you its only the 10th batch i have made, 4 using koh other 6 Naoh.
am using a gl design 85 lts feedstock in a 100lt copper cylinder.

[nigelb]

the number of batches in this case is immaterial. If it's the first time you've seen them in ten batches then it 's nothing to do with process....unless you are constantly or recently changed something.

It could be feeedstock. Has that changed?

[willbuild]

yes one of the 10 ltr cubbies the bottom half was a thick light mustard colour.

[Jamesrl]

yes one of the 10 ltr cubbies the bottom half was a thick light mustard colour.

Sounds like your typical HMPE to me.

[nigelb]

yes one of the 10 ltr cubbies the bottom half was a thick light mustard colour.

It could be that.

I reckon the best thing to do is monitor the next few bathes and see what that produces.

If it reoccurs then it will be worth posting up pics of the soap tests.

If it disappears and the soap tests are normal then it could well be feedstock and again worth posting up results on this thread.

That's my take on your issues with the number of years of experience I have under my belt. (FWIW)

[willbuild]

am doing a test batch this w\end 60ltr. 30 lts normal feedstock ( used for frying chicken) 15 lts ( mustard oil as before) and 15 lts chippy oil ( was solid and have had to melt).
its in the processor now de watering at 90c. did a hot pan test and did crackle.
been in there 30 mins and collected 1 lt.
will wait till flow slows right down then add 15 lts of glyc that i took off last batch before doing water wash for a glyc pre wash.

[Jamesrl]

am doing a test batch this w\end 60ltr. 30 lts normal feedstock ( used for frying chicken) 15 lts ( mustard oil as before) and 15 lts chippy oil ( was solid and have had to melt).
its in the processor now de watering at 90c. did a hot pan test and did crackle.
been in there 30 mins and collected 1 lt.
will wait till flow slows right down then add 15 lts of glyc that i took off last batch before doing water wash for a glyc pre wash.

Looking at that feedstock it IS hmpe, chicken fat,  palm oil, both solid at a surprisingly high temperature, never tried mustard oil so can't comment on that one.

[willbuild]

when i say mustard am referring to the colour. came from a new source

[Jamesrl]

when i say mustard am referring to the colour. came from a new source

What's it say on the tins/cubie box?