ZimDist Posted April 22, 2019 Share Posted April 22, 2019 We are very new to this type of business, so all the help is appreciated. When we tried to filter our second batch of alcohol we had a drop in ABV from 40%(in the blending tank) to 35.5% after the first filtration. are as the first one, and we want to understand why this happens We are using the following: we mix 400-450 litres per batch of ethanol and RO soft water, and blend it down to 40% then pump it up through the bottom of two SS(un-pressurized filter colums) that hold 35kgs of Macadamian nut shell carbon. it keeps going around in series, we notice the drop in the ABV within about the first 45mins, then it stabiles for the rest of the time of filtration from 1 hour to 12 hours. What I did notice is that when we pump it the first time that it comes up through the carbon, there is about 40 litres of water pushed up, we skimmed this of both columns until we could taste and smell the "Cane" spirit. Why would we get a drop in the ABV? Thank you for all your help Link to comment Share on other sites More sharing options...
bluestar Posted April 22, 2019 Share Posted April 22, 2019 It is not unusual to lose a very small amount of ethanol in any processing step, but that is about 10x greater drop in proof than would normally be acceptable. That said, your charcoal filter will have to saturate with ethanol until it stabilizes, and what ABV that it will stabilize at is specific to your charcoal. Once it is stabilized, you should not see much drop in ABV. General rule though is NOT to do the final adjustment of proof before filtration, but afterwards, with filtered water. So, once stabilized, try filtering at 45% or 50% ABV, then proofing down just before bottling. If you are wondering why your charcoal might pull out so much ethanol, it depends on how hydrophobic/hydrophilic the charcoal is. More hydrophobic charcoal will tie up more ethanol as it stabilizes. Some charcoals are processed, for example with acids, to make them less hydrophobic. Link to comment Share on other sites More sharing options...
bluefish_dist Posted April 23, 2019 Share Posted April 23, 2019 I always filtered at 50% for just that reason. I usually only got a 1-2% drop during filtration and I started with wet carbon and flushed with water. 5% seems like too much of a drop. Start high so it can drop without getting you out of spec on bottled proof. Link to comment Share on other sites More sharing options...
Silk City Distillers Posted April 23, 2019 Share Posted April 23, 2019 Is the filter/system or carbon being rinsed with water prior to filtration? Sounds like there is residual water in the system that isn't drained, or can't be drained. It is customary for carbon to be rinsed with water prior to use, to reduce the level of small carbon particulate (fines). Water logged carbon, even if not obvious, will impact proof. From a filtration loss perspective, you might consider first running RO through the filtration system to purge. Followed by your alcohol at a higher proof - to compensate for the water, run RO again at the end of filtration to ensure alcohol isn't remaining in the system. This will require some trial and error to understand what proof level you'll need to compensate for pre and post-purge. Always target a final filtration proof slightly above bottling proof, and do your final gauge/proof after filtration to ensure hitting target proof with no issues. Link to comment Share on other sites More sharing options...
Foreshot Posted April 23, 2019 Share Posted April 23, 2019 Listen to this podcast (second half-ish time stamp): https://www.boozewerks.com/2019/04/05-potato-distilling/ Devin is a member here. Link to comment Share on other sites More sharing options...
ZimDist Posted April 23, 2019 Author Share Posted April 23, 2019 Thank you so much for the info, this makes a lot of sense 6 hours ago, Silk City Distillers said: Is the filter/system or carbon being rinsed with water prior to filtration? Sounds like there is residual water in the system that isn't drained, or can't be drained. It is customary for carbon to be rinsed with water prior to use, to reduce the level of small carbon particulate (fines). Water logged carbon, even if not obvious, will impact proof. From a filtration loss perspective, you might consider first running RO through the filtration system to purge. Followed by your alcohol at a higher proof - to compensate for the water, run RO again at the end of filtration to ensure alcohol isn't remaining in the system. This will require some trial and error to understand what proof level you'll need to compensate for pre and post-purge. Always target a final filtration proof slightly above bottling proof, and do your final gauge/proof after filtration to ensure hitting target proof with no issues. Thank you, what I did I left t overnight with hot then warm water, drained the filters this am. When you purge do you discard the RO water, or keep it int he system? And same Post purge? I proofed it at 42% ABV today and then filtered it and its down at 38 ABV. I haven't post purged this batch, will do that in the AM. However I think I must start with a target of 50% on the next run. I will do this tomorrow. If I am starting with 36% ABV on my new batch and want to get it to 50% how much ethanol should I use? Ethanol at 95.7`% Link to comment Share on other sites More sharing options...
ZimDist Posted April 23, 2019 Author Share Posted April 23, 2019 18 hours ago, bluestar said: It is not unusual to lose a very small amount of ethanol in any processing step, but that is about 10x greater drop in proof than would normally be acceptable. That said, your charcoal filter will have to saturate with ethanol until it stabilizes, and what ABV that it will stabilize at is specific to your charcoal. Once it is stabilized, you should not see much drop in ABV. General rule though is NOT to do the final adjustment of proof before filtration, but afterwards, with filtered water. So, once stabilized, try filtering at 45% or 50% ABV, then proofing down just before bottling. If you are wondering why your charcoal might pull out so much ethanol, it depends on how hydrophobic/hydrophilic the charcoal is. More hydrophobic charcoal will tie up more ethanol as it stabilizes. Some charcoals are processed, for example with acids, to make them less hydrophobic. I am definitely going to target 50% not he next run. Do we leave ro water in the filters when not using so the carbon doesn't dry out? Link to comment Share on other sites More sharing options...
bluestar Posted April 23, 2019 Share Posted April 23, 2019 3 hours ago, ZimDist said: I am definitely going to target 50% not he next run. Do we leave ro water in the filters when not using so the carbon doesn't dry out? I would recommend leaving it saturated with vodka at proof you were filtering. Link to comment Share on other sites More sharing options...
ZimDist Posted April 24, 2019 Author Share Posted April 24, 2019 Sorry for such a simple question when you say saturated. Do you mean leave what ever is in it after you drain it? we started with 430litres drained it, got a net amount of 410 so still 20litres in the Colums. so we should leave this and get the Benidorm in the next run? Link to comment Share on other sites More sharing options...
PeteB Posted April 26, 2019 Share Posted April 26, 2019 On 4/24/2019 at 4:45 AM, ZimDist said: ................... If I am starting with 36% ABV on my new batch and want to get it to 50% how much ethanol should I use? Ethanol at 95.7`% For every 1 Kg of 36% you add 0.2481 Kg of 95.7% to bring up to 50% Get yourself a copy of Alcodens, you can download a trial version that will give you about 12 test runs https://www.katmarsoftware.com/alcodens-download.htm Link to comment Share on other sites More sharing options...
bluestar Posted April 29, 2019 Share Posted April 29, 2019 On 4/23/2019 at 9:48 PM, ZimDist said: Sorry for such a simple question when you say saturated. Do you mean leave what ever is in it after you drain it? we started with 430litres drained it, got a net amount of 410 so still 20litres in the Colums. so we should leave this and get the Benidorm in the next run? You can leave it full, or leave it wet with vodka and sealed, so that the "empty" porous parts of the bed will eventually become fully saturated with the vapor from the vodka. What you want to avoid is rinsing with water or entirely drying it out. Leaving it standing with just water risks bacterial contamination, leaving higher proof spirit in the column, sealed, should prevent that. Link to comment Share on other sites More sharing options...
Blackheart Posted April 29, 2019 Share Posted April 29, 2019 Alternatively we seal and store membrane/polishing filters in the freezer to inhibit bacterial growth. Has been working great. Link to comment Share on other sites More sharing options...
ZimDist Posted April 29, 2019 Author Share Posted April 29, 2019 On 4/26/2019 at 3:53 AM, PeteB said: For every 1 Kg of 36% you add 0.2481 Kg of 95.7% to bring up to 50% Get yourself a copy of Alcodens, you can download a trial version that will give you about 12 test runs https://www.katmarsoftware.com/alcodens-download.htm thanks, I have done so, doing the trial version Link to comment Share on other sites More sharing options...
ZimDist Posted April 29, 2019 Author Share Posted April 29, 2019 3 hours ago, Blackheart said: Alternatively we seal and store membrane/polishing filters in the freezer to inhibit bacterial growth. Has been working great. thank you Link to comment Share on other sites More sharing options...
ZimDist Posted April 29, 2019 Author Share Posted April 29, 2019 Thanks for all the help. I have got hold of PALL here, and they have a carbon filtration system that it looks like we will trial. I will give you all feedback Link to comment Share on other sites More sharing options...
ZimDist Posted May 1, 2019 Author Share Posted May 1, 2019 DO any of you use the following: Stage 1-Carbon Filtration : Sized at 250 LMH Supradisc Housing : WSFZ162F31UT5J - WSFZ Standard Accessory Kit : GFB0157 Carbon Module : PN 7007965 ; AKS 4 300XAK4C419SP - https://food-beverage.pall.com/en/spirits/activated-carbon-treatment.html Stage 2- Blended Product : Sized at 500 LMH Suprak S Housing : SPSA100TVA – S housing - data sheet attached Modules : PN 5303133/S SUPRAPAK SH 5900 SW ( Pauline may you kindly confirm if this is still available on SAP, option will be to move to lower pore size) - https://food-beverage.pall.com/en/spirits/chill-haze-removal-stabilization.html Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now