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InvisibleRobo
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Registered: 05/08/07
Posts: 14,861
Evaporating Solvents
    #7260759 - 08/05/07 12:13 AM (13 years, 9 months ago)

I just need some general info. about evaporating solvents such as xylene, naphtha(petroleum ether), etc. to get crystal formations(in say, an extraction).

What are some good ways to speed up the evaporation process when dealing with solvents? Can solvents be heated to speed up evaporation with say...a hot plate or low heat level on a stove , or does this hurt the crystals in any way? Do some solvents evaporate more readily than others?

I have heard and read that xylene is one of the most used solvents in extractions. This also happens to be the solvent most readily available to me and easiest to obtain. Is it a good choice?

Thanks for any info you can give me :smile:


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Offlinedirtworshipper
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Re: Evaporating Solvents [Re: Robo]
    #7260865 - 08/05/07 01:00 AM (13 years, 9 months ago)

placing the solvent in an oven on low heat (check the boiling point for each solvent first!!) will work

so will leaving it sitting out (takes lots longer, but crystals usually look more defined this way)

having a fan blow over it works too

:grin:

oh, and some solvents work better than others for different things


--------------------

“You've got as many lives as you like, and more, even ones you don't want.” - George Harrison


Edited by dirtworshipper (08/05/07 01:01 AM)


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OfflineSeussA
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Re: Evaporating Solvents [Re: Robo]
    #7261398 - 08/05/07 07:13 AM (13 years, 9 months ago)

Solvent fumes + flames/fire/sparks = bad (fire/explosion)

Start out with moving air. Put your solution in a large shallow glass container (lots of surface area) and place a fan so the air blows across the container.

Still too slow? You can use a hair dryer to safely warm things up.

Beyond that, unless you have a vacuum pump, I wouldn't do anything else.


Remember, fire is bad... lighting that cigarette around evaporating solvents might just end the habit, forever. Lots of ventilation is a good thing, from a safety standpoint. Just be careful you don't draw attention to yourself from the neighbors.


--------------------
Just another spore in the wind.


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Invisiblethedudenj
Man of the Woods

Registered: 08/18/04
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Re: Evaporating Solvents [Re: Robo]
    #7261411 - 08/05/07 07:22 AM (13 years, 9 months ago)

warm naptha is a better solvent. do it out side on a hot day in the shade. so that the so hot air blows by it cools absorbs naptha then blows away releasing it into the warmer air around it. difussion.


--------------------

"You all are just  puppets... You have no heart...and cannot feel any pain...""
you may think thats pain you feel but you must have a heart to feel true pain and that pain wont be yours


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InvisibleRobo
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Re: Evaporating Solvents [Re: Seuss]
    #7262127 - 08/05/07 02:34 PM (13 years, 9 months ago)

Quote:

Seuss said:
Solvent fumes + flames/fire/sparks = bad (fire/explosion)





Alright, so about what dirtworshipper said: The oven would definitely be a bad idea,then?shallow glass pans are probably first choice, but materials such as porcelain or enamel coated pans should be alright, correct? In regards to the hairdryer, would you point it so the airflow goes across the top of the pan just as with a fan, or would it be okay to point it somewhat at the solvent to warm things up?

Thanks for your help. :smile:


Edited by Adagio (08/10/07 09:23 PM)


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Offlinedirtworshipper
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Re: Evaporating Solvents [Re: Robo]
    #7262179 - 08/05/07 02:53 PM (13 years, 9 months ago)

The heating method is probably the fastest, next to a vacuum pump. It's very true that flames, sparks, etc. are extremely bad. So, it'd be best to use an electric hot plate or something of that sort.

You would probably be better off slowly evaporating it though. The crystals will be better defined.


--------------------

“You've got as many lives as you like, and more, even ones you don't want.” - George Harrison


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InvisibleRobo
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Re: Evaporating Solvents [Re: dirtworshipper]
    #7262459 - 08/05/07 04:18 PM (13 years, 9 months ago)

How long can it take for a pan of solvent to fully evaporate without being too hasty about it and getting defined crystals? Are we talking hours? days?


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Invisiblethedudenj
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Re: Evaporating Solvents [Re: Robo]
    #7262467 - 08/05/07 04:21 PM (13 years, 9 months ago)

what about a hot glass encolsure room. i have seen naptha evap really quick that way and a fan


--------------------

"You all are just  puppets... You have no heart...and cannot feel any pain...""
you may think thats pain you feel but you must have a heart to feel true pain and that pain wont be yours


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InvisibleRobo
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Re: Evaporating Solvents [Re: thedudenj]
    #7262525 - 08/05/07 04:38 PM (13 years, 9 months ago)

Quote:

thedudenj said:
what about a hot glass encolsure room.




could you explain?


Edited by mo0nlite_sonata (08/05/07 04:40 PM)


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Offlinedirtworshipper
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Re: Evaporating Solvents [Re: Robo]
    #7262631 - 08/05/07 05:14 PM (13 years, 9 months ago)

Well, it depends how much solvent you're evaporating, but it probably won't take more than 6-8 hours if you're just having a fan blow over a glass/ceramic bowl/pan. Make sure to do this in a well ventilated room though!


--------------------

“You've got as many lives as you like, and more, even ones you don't want.” - George Harrison


Edited by dirtworshipper (08/05/07 05:17 PM)


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InvisibletrendalM
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Re: Evaporating Solvents [Re: Robo]
    #7262702 - 08/05/07 05:34 PM (13 years, 9 months ago)

A lot of it depends on the solvent you use...butane for example will evaporate a LOT faster than say naptha.

Your best to do this outside in an area with lots of ventilation, with a fan blowing gently over the pan.


--------------------
Once, men turned their thinking over to machines in the hope that this would set them free.
But that only permitted other men with machines to enslave them.


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Invisiblethedudenj
Man of the Woods

Registered: 08/18/04
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Re: Evaporating Solvents [Re: Robo]
    #7262712 - 08/05/07 05:38 PM (13 years, 9 months ago)

like if you had a glass enclosed room out side of your house with screen doors and glass sliding doors. its a great thing to have


--------------------

"You all are just  puppets... You have no heart...and cannot feel any pain...""
you may think thats pain you feel but you must have a heart to feel true pain and that pain wont be yours


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InvisibletrendalM
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Re: Evaporating Solvents [Re: thedudenj]
    #7262737 - 08/05/07 05:42 PM (13 years, 9 months ago)

Just make sure it has plenty of ventilation...solvents are only really a danger when they're in a confined space.


--------------------
Once, men turned their thinking over to machines in the hope that this would set them free.
But that only permitted other men with machines to enslave them.


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InvisibleRobo
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Re: Evaporating Solvents [Re: trendal]
    #7263880 - 08/05/07 10:54 PM (13 years, 9 months ago)

no doubt :thumbup:


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Invisiblethedudenj
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Re: Evaporating Solvents [Re: Robo]
    #7263976 - 08/05/07 11:19 PM (13 years, 9 months ago)

lol thats why its out side its a great tech.


--------------------

"You all are just  puppets... You have no heart...and cannot feel any pain...""
you may think thats pain you feel but you must have a heart to feel true pain and that pain wont be yours


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InvisibleAcyl
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Re: Evaporating Solvents [Re: Robo]
    #7265544 - 08/06/07 11:03 AM (13 years, 9 months ago)

Quote:

mo0nlite_sonata said:
What are some good ways to speed up the evaporation process when dealing with solvents?




Buy a rotovap :lol:

Quote:


Can solvents be heated to speed up evaporation with say...a hot plate or low heat level on a stove , or does this hurt the crystals in any way?




Yes heating things usually speeds up the evaporation process.. no crystals will be harmed in the production of solvent vapours.

Quote:


Do some solvents evaporate more readily than others?




Some have lower boiling points, others have higher boiling points.

Quote:


I have heard and read that xylene is one of the most used solvents in extractions. This also happens to be the solvent most readily available to me and easiest to obtain. Is it a good choice?




I wouldnt call it the most used but its not a bad choice if it dissolves what you need it to dissolve.


--------------------
:scrambled:

1 ,2


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Invisiblethedudenj
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Re: Evaporating Solvents [Re: Robo]
    #7265550 - 08/06/07 11:06 AM (13 years, 9 months ago)

xylene also smells alot worse


--------------------

"You all are just  puppets... You have no heart...and cannot feel any pain...""
you may think thats pain you feel but you must have a heart to feel true pain and that pain wont be yours


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InvisibletrendalM
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Re: Evaporating Solvents [Re: thedudenj]
    #7265576 - 08/06/07 11:23 AM (13 years, 9 months ago)

Which doesn't make it any less toxic :wink:

I prefer working with things that have a strong odor...because you can smell when you are in danger.


--------------------
Once, men turned their thinking over to machines in the hope that this would set them free.
But that only permitted other men with machines to enslave them.


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Invisiblethedudenj
Man of the Woods

Registered: 08/18/04
Posts: 14,684
Re: Evaporating Solvents [Re: Robo]
    #7266558 - 08/06/07 04:06 PM (13 years, 9 months ago)

im not saying the smell makes it less dangerous but it does smell worse lol. its easier to keep things unknown with naptha


--------------------

"You all are just  puppets... You have no heart...and cannot feel any pain...""
you may think thats pain you feel but you must have a heart to feel true pain and that pain wont be yours


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Invisiblejohnm214
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Re: Evaporating Solvents [Re: thedudenj]
    #7279752 - 08/10/07 01:06 AM (13 years, 8 months ago)



several g's though...

Avoid heat... you'll very likely create flame

I'm guessing several days min. to evap a decent amount of solvent (1/2 liter) via setting it out, but never tried it per se.... I know in erlenmeyers things like hexanes take forever to evaporate, but small neck


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