Is there any reason for not making a scroll recovery pump?
https://www.scrolllabs.com/product/sh-30-25-high-pressure-compressor/ these are used in CNG apps, but they’re small, maybe a difficult thing to make at large scale.
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It’s my understanding that scroll compressors without lubricated tip seals are pretty inefficient/ineffective. That tip seal lubrication is the primary issue with using it as a recovery pump.
Might be worth taking a Copeland compressor and seeing if you can build a sufficient oil separation/return setup to keep the compressor happy and oil out of the solvent. It would blow the shit out of the capacity of most of these other units for cheep cheep money if you could
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Someone should start an Open Source Project to do that and see the outcome.
The other consideration is water fouling the oil in the compressor but I bet a big suction drier would do the trick and dry the solvent at the same time too
So this:
With one of these:
https://www.ebay.com/itm/New-AC-R-henry-refrigerant-oil-separator-S-5188/124157531799?hash=item1ce85d9697:g:MeEAAOSwMRtemhO3
And one of these:
Plus a solenoid, starter, and float for the oil return…
Should be able to do about exactly one lb isobutane per minute at 0C. At room temp it’d be about twice that. Honestly not sure how this fits for capacity/price. Probably not apples to apples but vs $17k for a T91…
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