Making Whiskey: from Good to Better!

Whiskey making: the procedure

If we exclude grain handling and aging, traditionally, whiskey is made in three steps:

  1. Mashing (converting starches into fermentable sugars by using enzymes);
  2. Fermenting (converting the fermentable sugars into alcohol with yeast);
  3. Distilling (concentrating the alcohol and harvesting the right flavors).

In order to create the best possible whiskey, both in terms of yield and taste, all steps need to be optimized. The end product is the sum of how the various parts are performed.

If mashing is sub-optimal, the major loss you face, as a craft distiller, is yield. You will create less alcohol. A failing fermentation will, above all, have impact on flavor creation. That’s because over 80% (as a rule of thumb) of taste molecules are made during fermentation. Bad distilling procedures can affect both yield and flavor composition of your new make spirit.

Whiskey making: historically

Historically, whiskey was made in small batches. Small mashes are easy to handle. Small ferments do not generate a lot of heat. Small, copper stills were the norm, because copper was available, affordable, and bendable.

In the 1870’s the industrial revolution found its way into the distilling industry. A lot of the whiskey production became bigger and more centralized. A declining number of remaining distilleries that, each on their own, saw a steep increase in production output.

Small batch traditionally allows for good control and therefore good whiskey …

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Batch size growth associated problems

As distilleries grew bigger, mashing basically scaled up from small batch to big batch, and yield didn’t suffer. Fermentation scaled up from small batch to big batch as well, and this did created a major problem.

Fermentation creates heat, and the bigger ferments created more heat. The warmer fermentations stressed out the yeast and produced multiple unwanted flavor compounds in the base beer, of which sulfur was (and is) the most important.

In short? As distilleries got bigger, mashing didn’t get compromised, but fermentation did. Yield didn’t suffer, but flavors did. Interestingly enough, it took a few more decades for distillers to realize they actually had a problem.

Bigger, uncontrolled ferments generate bad flavors that copper catalyses …

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Houston, we have a problem!

In the 1960’s new metallurgic innovations found their way into the distilling industry. As growing distilleries needed bigger stills, traditional copper stills were replaced with more modern stainless steel set-ups. And guess what? All of a sudden the whiskey they produced had bad, sulfur associated flavors in them!

What had happened, was the following: copper reacts with sulfer. The traditional copper stills had managed to polish-up the bigger, overheated, sulfur-rich whiskey beer! Copper, it turned out, was a really good medicine for a bad ferment.

With SS stills, sulfurs no longer got catalyzed, and bad ferments got exposed …

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The traditional solution

The switch from copper to stainless steel stills brought to light a major problem: bigger ferments created off-flavors. The solution the industry rallied toward, was to switch back to copper stills. The copper catalyzed the sulfuric compounds to below the taste threshold, and the problem was solved. Or wasn’t it?

Bigger ferments, left unchallenged, grow too hot, stressing the yeast into making multiple unwanted flavors. Sulfur is the most significant of those and copper does a good job at cleaning up these sulfuric flavors, and at hiding the poorly managed ferments.

So the distilling industry switched back to copper stills …

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Compromised solution

Using copper stills, to counter bad ferments, is a treatment of effects, not a root cause solution. By allowing for non-optimized whiskey production via copper stills, the following set of new problems occurs:

  1. Uncontrolled, overheating fermentations create more bad flavors than just sulfur;
  2. The copper clean-up during distillation does not polish-up all of those;
  3. Copper stills oxidize, creating copper contaminated whiskey;
  4. Copper stills need extensive cleaning, making for longer working days;
  5. Due to oxidation and cleaning, copper stills need to be replaced in 10 to 15 years.

Even though copper stills are a medicine for bad ferments, they are not the ultimate solution. Bad ferments create bad flavors, and copper does not counter all of them. More so, copper is a heavy metal that is toxic to humans. Due to the reactive qualities of copper, the distillation equipment needs extensive cleaning. This cleaning, as well as the general levels of oxidation, severely hamper a copper still’s longevity.

The iStill solution: a revolution!

That’s why we started proposing a different approach. Here it is. Let’s call it the iStill solution:

  1. Mash in a controlled environment, to achieve maximum yield;
  2. Ferment in a controlled way, to achieve maximum flavor;
  3. Distill in a controlled way, to achieve maximum yield and flavor.

Our iStills are designed to mash with 0.1 degree temperature tolerance. This gives the distiller the opportunity to maximize yield, which helps optimize production quantities.

During fermentation, our technology brings temperature, pH, and SG under control. This ensures that the distiller maximizes the desired flavor development, while mitigating the production of off-flavors.

Finally, the iStills have perfect control over the distillation process. This helps the distiller in optimizing both flavor profile and yield in the most efficient and repeatable way.

iStill gives you the control to make better whiskies …

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Design choices

Because we optimize fermentation, the creation of undesired, bad flavors is minimized. As a result, we do not have to build our stills out of copper. This way, we can deliver a still that is easy to clean, does not cause copper particle contamination in your spirits, and has tremendous longevity.

But if you decide you are going to do your fermentation quick & dirty anyhow, well, please know we have copper waffles that you can insert at the bottom of the column. It takes less than a minute to put them in place. It takes less than 10 seconds to take them out, when the run is done. They have the same surface area as a complete copper column, without the hassle.

iStill copper waffles: well-used …

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New iStill 250!

Introduction

We are introducing a new model: the iStill 250! This new unit, with 250 liter net boiler capacity, replaces the current iStill 200, that will be discontinued from now onwards. The all new iStill 250 will be bigger, stronger, and more versatile. Let’s dive in deeper.

Features

The all-new iStill 250 comes with a flush square boiler design for optimized mixing. The boiler comes with the additional manhole.

The unit can be equipped with iStill’s revolutionary and proprietary J-PAS agitator system. The iStill 250 can be ordered with direct or indirect heaters, and a power management capacity of up to 16 kWh, for ultra-fast heat-up and run times. The boiler radiator is another option that’s supported on our latest model.

The new iStill 250 can distill any spirit to perfection, on and off the grain. It can also mash and ferment, making it a single-vessel distillery all on its own. Just like its bigger brothers, the iStills 500, 1000, 2000, and 5000.

Availability

The iStill 250 can be ordered as of right now. It replaces the current iStill 200, that will no longer be produced.

Technical Drawing New iStill 250 boiler …

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iStill 500 Upgrade!

We are upgrading the iStill 500! The power management will see a significant performance increase, and is upgraded from 18 kWh to a maximum of 21 kWh. An increase of 17%, resulting in faster heat-up and production times. How much faster? Well, up to 17% faster!

As of today, all orders received for the iStill 500 will be for the new, upgraded, 21 kWh version with the redesigned boiler.

Two of our iStills 500 on the island of Scilly …

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iStill 2000 Upgrade!

We are upgrading the iStill 2000! Both the column and power management will see a significant performance increase.

The iStill 2000’s power management is upgraded from 45 kWh to a maximum of 54 kWh. An amazing 20% increase, resulting in faster heat-up and production times. How much faster? Well, up to 20% faster. Relative to the latest 45 kWh version that is. The original i2000 had 36 kWh, by the way. Relative to that one, the power increase is a whopping 50%!

The column height of the iStill 2000 Hybrid will increases with 25 centimeters. We also redesigned the column’s internals in order to further optimize the vapor/liquid alcohol/water exchange phase.

Together, these two improvements allow the column to effectively handle the power increase, and translate this energy increase into more output and even better control over product quality. How much the column performance is increased? By no less than 26% …

As of today, all orders received for the iStill 2000 will be for the new, upgraded, 54 kWh version. Retrofitting existing iStills 2000 to a higher power output is unfortunately not possible.

iStill 2000 …

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Our Solution to Component Shortages!

Introduction

As we informed you last week, the global shortages of electronic components is creating longer lead times. But iStill wouldn’t be iStill if we hadn’t come up with a solution for those on a short timeline.

Solution

Instead of ordering – as an example – a fully automated iStill 2000 Hybrid, we’ll advise you to order the semi-automated iStill 2000 Hybrid with the full automation suite as an addition. This way, you’ll receive your semi-automated iStill 2000 in about four to five months.

As we wait out the electronic component shortages, you can go ahead and start distilling. Once the full automation suite is ready, probably about nine months after you placed the order, we’ll ship it to you and you can upgrade.

At your service,

The iStill Team.

http://www.iStill.com

iStill 1000 Upgrade!

We are upgrading the iStill 1000! Both the column and power management will see a significant performance increase.

The iStill 1000’s power management is upgraded from 27 kWh to a maximum of 30 kWh. An increase of 11%, resulting in faster heat-up and production times. How much faster? Well, up to 11% faster.

The column height of the iStill 1000 Hybrid will increases with 25 centimeters. We also redesigned the column’s internals in order to further optimize the vapor/liquid alcohol/water exchange phase.

Together, these two improvements allow the column to effectively handle the power increase, and translate this energy increase into more output and even better control over product quality. How much the column performance is increased? By 18% …

As of today, all orders received for the iStill 1000 will be for the new, upgraded, 30 kWh version.

iStill 1000 …

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New iStill Deliveries, Worldwide!

Another shipment of iStills! The units will go to the Rotterdam Harbor, where they will be crated. After that, they go to new customers all over the world. Today? Today we ship an iStill 2000, an iStill 500, nine iStills Mini, and three 50 liter boilers for existing iStilleries that want to expand on their training and/or recipe development capacity.

http://www.iStill.com