I haven’t measured the Celite to crude ratio. It depends a bit on what is in the crude first. More terps and such will alter it, but don’t worry. Just estimate how much to dump into your solvent. After you stir it if it is caked up just estimate how much more to add and stir it in. Then If you stir it into caked up stuff and it isn’t mixing well, simply add back enough solvent to the mix to redisolve everything again but now there will be more Celite and evap to a powder. After one or two batches it is easy to judge plus you really cannot put too much Celite in.
I am limited by column size so too much Celite means two runs because it won’t all pack into my small column.
I prefer also to run this as the SOP between first and second run. Purity skyrockets on the second run after a clean and well prepped DCVC run on first run material. It also means I can run slightly lower temps so the effects down the line add up. What I plan to do this month is use my saved but flushed column from last month. It is too nicely packed and working to toss just yet (silica gel 60 and now flushed Celite with a sand layer on top). I want a new column for the run after first pass but will wet load my medicine this month on top of the sand and Celite layer already loaded and run it prior to first pass too.
I am not production so can be picky about using a clean column. My goal this month, foolishly, is to attempt to achieve lab standard purity. No reason but the challenge and I am pretty sure I can nail it. I have a few tricks to really knock out the tenacious contaminates too and am gonna bring it all into one lab. A production lab would likely be better to dedicate a column for just pre-distillation and a seperate one for post distillation. this way reusing a column would not drag already seperated compounds into a finished product. There is always residual hold up on the silica gel 60 I use.
I have no experience scaling up. My suggestion is the same as for distillation really if you plan to attempt it. I suggest first succeeding on a micro scale like one ounce. Figure out how to correctly and repeatable run an ounce of crude through the process. For DCVC the investment in a column(s) like mine sets you back a few hundred dollars and you need a suitable vacuum. Dual vane pumps and pumps that do not like solvent fume should never be used. Hexane and ethyl acetate fume VERY quickly destroyed the seals and thusly the first vacuum pump I owned lolz. I left ethyl acetate in my sublimator overnight once and sealed into it. The Viton o-ring expanded by about 10% overnight! Major fail lolz. New o-ring $15 from Amazon.
Once you figure out on just one ounce where the pitfalls are and how it looks when it is running right then you will have an idea how to scale it.
There is one video that I watched over again several times and each time it seems I spot something else that helps. This is the video that started me on this and if you take the time to really listen to what he says, every word, then you will have the best info out there by far. I altered the procedure because I am seperating for preparing a compound (not analyzing) and I know when the target has eluted so I never have more than about a dozen fractions if flushing the column and even less when I stop the run after collecting cannabinoids.