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For some time I have been wondering what is the ABV in each plate of a 6 plate DASH-2. I decided to make a manifold which would allow me to collect liquid from each plate. The following is a summary of my progress and information collected during the first 2 runs.
I used Harris Stay Clean liquid flux and Harris Saty-brite 8 solder (8%) silver.
I basically used a copper end cap as a collection cup that is placed directly under the downcomer of the plate above. Once full, it allows excess liquid to drop down to the lower plate and continue along the reflux path. From this collection cup, I attached a section of 3/8" OD 316 stainless tubing thru the sidewall of the bubble "T", then to a valve and a collection manifold that directs all the collected liquid to a PC, and on to the parrot.
The first 2 runs were for testing and cleaning and afterwards I decide to modify the collection cup by adding 3 downcomer deflector fins like the ones used in the Pro-Cap's. I felt the cups were dumping down right on top of the lower downcomer, and hence affecting the efficiency and results.
The first run was a gallon of neutral and approx. 8 gals of water for a charge of around 10-11% abv and for the second run, I added all the collected product plus one additional gallon of neutral ( but at a lower abv from a stripping run) for a charge of around 15-16%
The collection speed was kept at around 3 or 4 L/Hr and product temp at the parrot was between 69 ad 71F so I did not bother with temp corrections as my goal was more towards the difference in ABV between plates instead of exact value at any point.
The wash was brought to a boil and stabilized all the plates for approx. 15 minutes only since cuts were made during the stripping run. Then 100 mls of fores and 200mls of heads were collected thru the dephlegmator and u-bend and condensed with the top PC. into the parrot. The column was then placed in full reflux for a few minutes and from there on all product was collected as a liquid thru the collection manifold and into the lower PC and finally the parrot.
The first run results showed:
plate 6 90 ABV plate 5 80 ABV plate 4 60 ABV plate 3 50 ABV plate 2 41 ABV plate 1 36 ABV
The second run results showed:
plate 6 90 ABV plate 5 86 ABV plate 4 76 ABV plate 3 66 ABV plate 2 66 ABV plate 1 64 ABV
All samples collected were just over 200 mls each and the parrot was drained before switching to a different plate.
The results for plates 1, 2 and 3 on the second test lead me to believe that the collection cup was dumping directly into the downcomer, thus affecting the reflux in those plates and this is the reason why I decided to add the downcomer deflectors to all the collection cups and some more testing will soon follow.
It will be near the end of Jan before I can perform any more tests.