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Crown and Klean strip VMP have changed chemically.

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benzyme said:
the cloudiness is due to microemulsions.
from the linked pdf's, it looks like they added some polymers to the formula?

I'd screen naphtha, but I don't have an APCI interface. I can only test ionizable solvents. this is a job for GCMS.
Click to expand...


@Benz

Quick question, I have this other container of klean strip naphtha, same as this recent container I used, though it doesn't 'smell' the same as the other [is there a typical naphtha smell?], although this 'different smelling' naphtha evaporates clean [poured a little onto a glass dish and it left absolutely no trace, film, nothing]. Why would there be a contrast in how it smells? Fine to use?
 
benzyme said:
the cloudiness is due to microemulsions.
from the linked pdf's, it looks like they added some polymers to the formula?

I'd screen naphtha, but I don't have an APCI interface. I can only test ionizable solvents. this is a job for GCMS.
Click to expand...


Yeah that sounds like a reason. So...when my naphta leaves no traces...is it fine to use? I already ordered a cleaner alternative. Best thing would be pure hexane but it's not that easy to purchase.
 
tatt said:
benzyme said:
the cloudiness is due to microemulsions.
from the linked pdf's, it looks like they added some polymers to the formula?

I'd screen naphtha, but I don't have an APCI interface. I can only test ionizable solvents. this is a job for GCMS.
Click to expand...


@Benz

Quick question, I have this other container of klean strip naphtha, same as this recent container I used, though it doesn't 'smell' the same as the other [is there a typical naphtha smell?], although this 'different smelling' naphtha evaporates clean [poured a little onto a glass dish and it left absolutely no trace, film, nothing]. Why would there be a contrast in how it smells? Fine to use?
Click to expand...

is it a light, or medium (weight) naphtha? medium naphtha contains some aromatics, and has a higher boiling point range.
vm&p (light naphtha) has a distinctive lighter fluid smell. it is a mixture of short-chain aliphatic hydrocarbons, including iso-aliphatics.
 
The can of naphtha that I was able to repeat the cloudy vinegar test with was used for A/B extraction as well as recrystalization and I can tell you that the final product was super clean. I have done many A/B extractions and this was possibly the cleanest. Whatever chemicals were added, if it was intentional, is likely to control evaporation rate.

Possibly if we want to remove said chemicals, acid washes could be done until washing solution comes out clear but that seems like it may be completely unnecessary.
 
Well the naphta i used was totally fine with the evap. test.
But it left my vinegar cloudy.
Today i took a look in the freezer...and i expected some crytals but I got clumps. One of them is huge. It looks like a piece of sugar which disolves in tea.
I'm not really sure what that means :?:
 
benzyme said:
is it a light, or medium (weight) naphtha? medium naphtha contains some aromatics, and has a higher boiling point range.
vm&p (light naphtha) has a distinctive lighter fluid smell. it is a mixture of short-chain aliphatic hydrocarbons, including iso-aliphatics.
Click to expand...

here's from the msds:
 

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After letting the naptha and about 20% aceitic acid sit for a couple days, both are clear and shaking/inverting causes only normal light emulsions. I will let the whole thing evaporate and see if there is any residue. My assumption is that only if there is some sort of salt or oil left behind from the aqueous solution that we have anything to worry about.
 
syberdelic said:
Bad news: There is an acetate salt residue from the aqueous solution after full evaporation

Good news: This salt can be analyzed
Click to expand...
Have you evaped a sample of the acetic acid alone, without mixing with the naphtha first?
i.e. testing a blank
 
downwardsfromzero said:
syberdelic said:
Bad news: There is an acetate salt residue from the aqueous solution after full evaporation

Good news: This salt can be analyzed
Click to expand...
Have you evaped a sample of the acetic acid alone, without mixing with the naphtha first?
i.e. testing a blank
Click to expand...

I will try it, but I'd bet money that it comes out clear.
 
benzyme said:
is that just from adding vinegar to vm&p?
I may have to try this. just picked up a qt. of kleen strip today.
i can definitely test salts.
Click to expand...

Yes, give it a shot. If yours doesn't go cloudy, I can send you some of the salts that I recovered.
 
syberdelic said:
downwardsfromzero said:
syberdelic said:
Bad news: There is an acetate salt residue from the aqueous solution after full evaporation

Good news: This salt can be analyzed
Click to expand...
Have you evaped a sample of the acetic acid alone, without mixing with the naphtha first?
i.e. testing a blank
Click to expand...

I will try it, but I'd bet money that it comes out clear.
Click to expand...


keep in mind 'distilled white vinegar' isn't always as clean as it looks, some dissolved organics, could leave a residue, so do a control test too if you do :)

EDIT:

Wow I literally did not read the post or I read it and saw something else. Exactly that was said, My mistake!
 
It has to be an acetate salt of something that is soluble in naphtha and boils under 130F. The salt form obviously has a much higher boiling point.
 
The acetic acid does indeed evaporate entirely, leaving nothing behind so the residue is most definitely being pulled from the naphtha.
 
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