Right. If you consider the condenser on any vertical tube and shell, short path head or jacket on a reactor the inlet is always the lower port to ensure the thermal fluid covers max surface area 
3 Likes
And the vapor path on an SPD is working counter to the transfer fluid path in that particular example -
For the sake of condensing volatile solvent- youāre comparing apples to oranges
Chinese chemical engineeringā¦ and marijuana enthusiastsā¦ match made in heaven.
1 Like
I feed from the bottom as well. I have 2x20L AI rotary evaporators. Plus sometimes when you fill from the top you can end up with an air bubble in the condensing coil and Iāve never seen that happen when filling from the bottom.
1 Like
Thatās really the crux of it. Regardless of whatās supposed to happen we are left with what functions properly and IME bottom fill ftw
Iām top filling the current one. Works great.
Usually I fill from the bottom, because the pumps never seem to be up for getting the bubbles out when going the other direction.
Bigger pump this timeā¦
1 Like
Yet when I suggested doing that at the lab that will not be named (liquid brown), I recall being chastised and maybe even smacked upside the head for suggesting the bottom fill. You told me that top down was primarily for protecting the vacuum pump. Granted, that was almost two years ago and quite the reductionist explanation of said event. A lot can change in that time. Haha
1 Like
In top out the bottom. You want the coldest part closest to the vacuum port to save solvent from entering the vacuum.
2 Likes
I donāt recall if that pump was sufficient when plumbed that way. All I recall was Puddles arguing vehemently with me about the correct direction to flow the hot water. 200f is way too warm to bathe inā¦
1 Like
Pretty sure it was this one on a 50L roto: