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  #11  
Old May 13th, 2018, 01:25 PM
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So my question is what really makes these "high brix" membranes different. I have went to 24 -25 brix with 3 different make of membranes. 1st try passed sugar fairly bad. The next membranes worked ok. No sugar passing but extremely low flow. This years membranes worked the best. Decent flow rate, no sugar passing, but probably at the limit of water removing I guess?? I felt flavor was still good at 24 but maybe i am wrong. Seems if I go higher with that brix, I need more flat pans to get enough flavor ? Anyone else trying middle ground so to speak, like 20-26 brix??
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  #12  
Old May 14th, 2018, 08:25 AM
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The approaches are slightly different depending on the manufacturer. The Lapierre HyperBrix is essentially two machines built together. The first stage (in our case, 4 membranes) is basically a regular RO that will bring the sap up to a fairly decent concentration, which is fed to the 2nd stage -- the HyperBrix side. This operates at a considerably higher pressure to get the concentrate to much higher levels. As for the membranes, we tried 3 different combinations of membranes last year and 4 different combinations of membranes this season to check on operating parameters (sugar and mineral passage, flow rates, etc.).

Evaporators to process such high Brix concentrate are specialized. Our rig is a 4' x 12', with a 4' backpan and a large, 8' frontpan, the opposite ratio of a standard evaporator. They are optimized less for boiling rate, but more so for color/flavor formation. Even so, the systems are quite energy efficient. We used 0.137 gal of kerosene to produce a gallon of syrup, but think we can get this down below 0.10 gal with some tweaks.

There are options in-between these high Brix systems and low-concentrate systems. Lapierre produces the 50:50 system, but I don't know a lot about it.
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  #13  
Old May 23rd, 2018, 09:18 PM
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I talked with a D&G rep who said they have a machine running 900 psi making near 40 brix. So the membranes are made to handle much higher pressure. I would guess there is still some R&D going on.
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Old May 24th, 2018, 05:46 PM
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Quote:
Originally Posted by Karl Evans View Post
I would guess there is still some R&D going on.
No doubt. You just don't want to couple one of these hi-brix RO machines to a standard evaporator.
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