Loss of abv while carbon treating

[vodka2014 0]

Could anyone advise if carbon treating should results in loss of alcohol percentage. We have treated a few times and found that we have lost percentage. I am wandering if it is because our system is open and we are losing it to the atmosphere. Any advise on this would be greatly appreciated.

[Artisan Still Design 8]

yes, you will get a small %abv drop when carbon filtering.

[Dehner Distillery 43]

You might have a temperature difference?

You might not have de-dusted your carbon, so you might have carbon dust in suspension. That would make you solution thicker, making it seem like it lowered the proof with a hydrometer. Let it settle out, there will be a super black film on the bottom of your vessel.

Active carbon works by ADsorbing (like static electricity, or an eletro-magnet). A sponge works by ABsorbing.

Take care!

[Dehner Distillery 43]

sorry left out a word...

"a super thin black film on the bottom..............."

[vodka2014 0]

Great stuff, thank you for your help.

[dhdunbar 52]

 

 

 

 

 

The proof drop is why TTB requires that you cut to final bottling proof after you have completed the filtering.  

[BeSocial 0]

On 5/16/2016 at 11:42 PM, dhdunbar said:

 

 

 

 

 

The proof drop is why TTB requires that you cut to final bottling proof after you have completed the filtering.  

can you provide reference to this requirement?

[bluefish_dist 13]

I do experience a drop in abv, but that is to be expected since we put the carbon in wet and chase the alcohol with water.  So I leave enough room for the proof to drop.  The final bottle proof is set after filtration. 

[dhdunbar 52]

2 hours ago, BeSocial said:

can you provide reference to this requirement?

Good call - insist on citations.  From me, from TTB, from everyone.  When it comes to regulation, advice that begins, "I think ..." should be suspect.  Sometimes we have to figure out what is required by "reading between the lines," but these regulations were updated in 2011 and the basic requirements go back to 1980.  TTB has had a lot of time to iron out the wrinkles of ambiguities.

Sec. 19.353  Bottling tank gauge - When a distilled spirits product is to be bottled or packaged, the proprietor must gauge the product after any filtering, reduction, or other treatment, and before bottling or packaging begins. The gauge must be made at labeling or package marking proof, and the details of the gauge must be entered on the bottling and packaging record required in Sec. 19.599.

 

[daveflintstone 34]

My understanding of that regulation is you must gauge your spirits after filtration, not cut to final proof after filtration.

[bluestar 63]

7 hours ago, daveflintstone said:

My understanding of that regulation is you must gauge your spirits after filtration, not cut to final proof after filtration.

You can adjust proof after filtering, although you will likely want to use filtered water of as good or better quality.

[daveflintstone 34]

Can but not must, unless it's not right of course.

[dhdunbar 52]

Let's agree to this -  the rule is you make the bottling gauge after the cut to bottling proof, i.e., when the spirits are ready to go into the bottle with no further changes to them, i.e., everything but bottling is completed. 

 If you cut to bottling proof before filtration, then any loss of proof after filtration, is going to bring you out of compliance, because the spirits in the bottling tank must be at bottling proof.  Because there is no tolerance, you are going to have to add spirits to the filtered product to get back to the bottling proof, then regauge.  The tolerance is only for evaporation loss in the bottling process.  That is a wonky distinction, because I do not think TTB would tumble to the wonky problem, if the bottled spirits were within tolerance, but it is nevertheless the requirement.  The easy solution is to reduce after filtration, but TTB does not prohibit adding spirits to bring filtered spirits back up to bottling proof.   

[RobertS 10]

If the carbon is fresh, it may be adsorbing some ethanol and water in appropriately sized pores. The carbon manual people like to pass around has a couple paragraphs on the mechanics of that, but I don't have any numbers to say how much ethanol would be adsorbed by any given activated carbon.

[Dehner Distillery 43]

Food for thought.

When we filter vodka through our carbon we don't back wash with water. We leave the vodka in our filter system untill the next time we use it just so we don't have this problem. It is always 80 proof, Always.