VM Liebig condenser to valve to column connection

[Big L]

Hi All,

This part just arrived, I must have not understood the picture properly as its not quite as i expected it to be..

https://www.aliexpress.com/item/3288526 ... 4c4dHw2tsB


The section that attaches to the column has a lip and i am a bit worried this will impact vapor product flow. As indicated in my diagram below will the flow path of V still be possible? I am concerned this part is in fact for a LM still rather than the VM i am trying to build. (not included in the drawing is a coil condenser above for reflux)

Also on a side note (minus some missing tube and a slightly bent condenser coil) all the stuff arrived promptish (36 days) from China

Thanks Everyone

[Bushman]

Your diagram does not match the link? Do you have to build your own column? Looks as if the product part of the still is too close to where it will attach to the column in order for it to clear the boiler. Not sure if this makes sense to you but the link still from china just looks a bit tight.

[StillerBoy]

What you have purchase cup with a valve and a mini liebig.. its called a vapor throat body.. as the vapors are condensed by a condenser about the cup, the liquid flows down into the cup, and can be extracted by open the valve, or allow to over flow and be refluxed in the column below it..

That item would work well on a concentric design..

Mars

[Big L]

Ah yes that makes sense. daym okay i'll just make this section out of copper then

[OtisT]

Your concern is well founded. That’s not gonna work at all as a VM head.

Otis

[StillerBoy]

That item would work well on a concentric design..

Here's a couple of pictures showing a vapor throat body on a concentric is built and works..

Mars

[Twisted Brick]

What you have purchase cup with a valve and a mini liebig.. its called a vapor throat body.. as the vapors are condensed by a condenser about the cup, the liquid flows down into the cup, and can be extracted by open the valve, or allow to over flow and be refluxed in the column below it..

That item would work well on a concentric design..

Mars

I thought that looked just like Rad's still!

[Yummyrum]

I’m thinking if you flipped it upside down , it would then be a VM
Can’ say how well it would work , but worth a try .

[Danespirit]

The part you linked to is an LM still head, yes.
To improve the product takeoff a "roof" over the inner pipe is helpful.
Vapor can still pass but everything condensed by the RC is lead to the void in between the two pipes...the rest overflows into the column again.
You can use this LM section (with or without the improvement I mentioned) and build a VM on top of that.
That will give you the option for an LM/VM combo a lot of members here are running with great success.
Btw..a conversion to a CCVM/LM combo is still possible by letting the VM section being on top of the LM.
By doing so you eliminate the costly valve needed for a traditional VM setup.

Edit: The flow path you've drawn won't happen.
It's against the laws of thermodynamics.
It will still be in the vapor phase as it passes the restriction/inner tube and moves up to the RC on top.
From there it condenses and falls as reflux downwards...(there the improvement with the "roof" comes in).

[bluefish_dist]

A easier to build version of what you drew is the two cups boka design. Just place a cut off T as a roof in the upper condenser section and then you don’t have to do a concentric condenser.

To make it a lm/vm, then add another T in the small diameter pipe and add a valve. Now it’s a vm as well. Makes the valve cheaper as it’s smaller.

[Big L]

A easier to build version of what you drew is the two cups boka design. Just place a cut off T as a roof in the upper condenser section and then you don’t have to do a concentric condenser.

To make it a lm/vm, then add another 90 in the small diameter pipe and add a valve. Now it’s a vm as well. Makes the valve cheaper as it’s smaller.

Do you mean this basically?

[bluefish_dist]

Like this.

[Danespirit]

+1 Bluefish.

Something like this is what I had in mind with an LM/VM combo.

[bluefish_dist]

That was how I built my first still head. I also added an external return line so the falling distillate was introduced below the takeoff and above the packing. Worked well. I eventually changed to my current design as it required a minimal amount of welding and was shorter.

[Yummyrum]

The dual reducer is a good design . I also used it on my 2” LM/VM still head .
OK , it’s a bit weirded out , but I was hoping to keep all my options open so it was designed so I could do reverse LM down the track .: Turns out , VM was streaks ahead straight off the bat .

9B3A338B-412C-4660-B498-695889A7756D.jpeg (21.27 KiB) Viewed 1574 times

viewtopic.php?f=17&t=67194#p7481508

[bluefish_dist]

Yummy, always wanted to try a reverse lm. Glad to hear I am not missing anything. That looks almost like my first still head except the lm valve was off the external pipe with a T.