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Old 08-08-2018, 07:31 AM #1
Calwax
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Closed Loop Woes

Hey Folks Im a new CLS user.

so to clear any questions .
extraction chain goes
Nitrogen assist/
30 lb Solvent tank/
6x24in non jacketed column/
10 inch Collection/
microseive/
pump/
condenser/
solvent tank
trs active recovery

Now my column isnt freezing up like i see on a lot of videos and stuff.
Am i doing something wrong.

I've read everything online and it seems i'm doing most everything right .

but i just dont know why my column isnt freezing up.
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Old 08-08-2018, 10:35 PM #2
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Quote:
Originally Posted by Calwax View Post
Hey Folks Im a new CLS user.

so to clear any questions .
extraction chain goes
Nitrogen assist/
30 lb Solvent tank/
6x24in non jacketed column/
10 inch Collection/
microseive/
pump/
condenser/
solvent tank
trs active recovery

Now my column isnt freezing up like i see on a lot of videos and stuff.
Am i doing something wrong.

I've read everything online and it seems i'm doing most everything right .

but i just dont know why my column isnt freezing up.
What are you freezing or chilling your column with? Sounds like it is non-jacketed so not sure why it would be frozen.
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Old 08-08-2018, 11:21 PM #3
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it IS a NON JACKETED column you are correct.

im not using anything to freeze the column

. the items that get heating/cooling in my system are

solvent tank on ice and rock salt,

jacketed collection pot that recirculates warm/hot water,

dry ice for the coil condenser out of the rec pump

. and then ill throw a heating pad around the column near the end of recovery to recover gas.

So you are saying it only ices up when you chill a jacketed column or butane?
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Old 08-09-2018, 12:59 AM #4
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Yes, what you are seeing when a column ices up is the moisture in the air freezing to the column as the column is often sleeved/jacketed with either liquid CO2 or dry ice/alcohol mix.
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Old 08-09-2018, 08:24 AM #5
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i have a problem where i feel like i am not getting the proper saturation because the last few burps of the column come out very gold into the collection so I am always left thinking, did i leave something on the table.

i run 6 to 1 ratio.

do I need to let it soak longer?
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Old 08-09-2018, 01:42 PM #6
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Your column is freezing because you are boiling off the LPG inside under vacuum, so as to remove the heat of vaporization.
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Old 08-09-2018, 05:10 PM #7
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Quote:
Originally Posted by Calwax View Post
i have a problem where i feel like i am not getting the proper saturation because the last few burps of the column come out very gold into the collection so I am always left thinking, did i leave something on the table.

i run 6 to 1 ratio.

do I need to let it soak longer?
I guess Gray Wolf missed you're running a 6" x 24" material column, because he usually makes the suggestion to limit the diameter to 4" to get the material uniformly soaked.

Are you showering, flooding, or both? How many showers and/or floods?
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Old 08-10-2018, 05:31 AM #8
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the problem is the my column is not freezing just getting a little cold to the touch the gets warm.

do i need to be chilling the butane going IN with a condenser.

my tech is. not to be too complicated
vacdown
chill tank with ice and salt
flood column till it wont take any more pressure at the ball valve
dump column to collectoin pot
turn on recovery
close feed
add hot water to collection
dry ice to condenser
heat to the column
recover forever


then pretty much where im lost
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Old 08-10-2018, 06:10 AM #9
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i feel like sometimes when i try to use n2 gas to push the column that it kinda locks up the flow
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Old 08-10-2018, 01:17 PM #10
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Originally Posted by Calwax View Post
i feel like sometimes when i try to use n2 gas to push the column that it kinda locks up the flow

Skyhighler is right that I answered your first question and didn't notice the second.

A six inch column is OK if you have enough flow and a shower head, but you most likely don't. Your flow will find the easiest way through, which is down he middle of the column. without fully wetting the outer edges of the column.

You can get full wetting with a bottom flood and a small supply, but not from the top and the fluid velocity washing away the boundary layer will be low.

You mention using a N2 push. Are you fully burping it off before recovery?

If not, recovery will be be slow because N2 is not condensable, only compressable, so your pump pulses are pushing against a spring action.

How long does it take to recover the LPG?
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An age is called Dark not because the light fails to shine, but because people refuse to see it.

Believing is seeing and ignorance is bliss until it bites you in the ass!

Fervor is the weapon of the impotent. The harder the sell, the poorer the product.

Alas, my ignorance abounds; the more I've learned, the less I know that I know..........

Thou shalt seek and respect the opinions of operators, even unto the third helper, for theirs is a wisdom unknown to technicrats.

Wise men learn more from fools, than fools from wise men.

In my dotage I finally discovered that the secret to putting on pants both legs at a time is sitting down.
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