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Nonalcoholic Wines + Distillation (Chemistry)

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楼主
发表于 3-23-2021 15:15:04 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
本帖最后由 choi 于 3-24-2021 10:15 编辑

Eric Asimov, Is Wine Intoxicating Without Its Intoxicant?  Nonalcoholic varieties are becoming increasingly popular. New York Times, Mar 16, 2021, at page D5 (D on that day was Food section, published every Wednesday).
https://www.nytimes.com/2021/03/ ... alcoholic-wine.html

Note:
(a) Asimov (surname)
https://en.wikipedia.org/wiki/Asimov_(surname)
("Asimov is a Jewish surname of Russian origin; see 'Isaac Asimov' for its genesis" at section 1 Surname)

(b) "The boiling point of alcohol, about 173 degrees [F = 78.3 degree Celsius], is lower than that of water, about 212 degrees [100 degrees C]. * * * Leitz and Thomson & Scott use vacuum distillation, a process that essentially separates a wine into its constituent parts at relatively low temperatures. The alcohol is then eliminated and the remaining parts reassembled."
(i) We start with vacuum distillation.
(A) Recall my Feb 11, 2021 posting titled "Offsprings of Standard Oil," whose Note (a)(iii)(B) was:

Vacuum Oil Company
https://en.wikipedia.org/wiki/Vacuum_Oil_Company
("Vacuum Oil was founded in 1866 by Matthew Ewing and Hiram Bond Everest, of Rochester, New York. Lubrication oil was an accidental discovery while attempting to distil kerosene. Everest noted the residue from the extraction was suitable as a lubricant. * * * It [company] originated the Mobil trademark in 1899 (as 'Mobilgas;' 'Mobiloil' came later)" )

Likely that was the start of vacuum distillation in history.
(B) Section 3.2.3 Vacuum distillation. In "Week 4: Brewing on an industrial scale." OpenLearn, undated
https://www.open.edu/openlearn/o ... ection=_unit5.3.2.3
("3.2.3 Vacuum distillation[:]  Here, the process of distillation is carried out under reduced pressure – known as a ‘vacuum’. The vacuum lowers the boiling point of the ethanol, meaning that other volatile flavour chemicals (such as alpha acids in the hops) are less affected, and the flavour remains closer to the original. Under the vacuum, the boiling point of the ethanol reduces from 78 °C to approximately 34 °C. This, therefore, allows the ethanol to be removed before the temperature of the distillation apparatus reaches the boiling point of the volatile flavour components")

The advantage is that some chemicals in wine or petroleum are sensitive to heat, similar to milk or fruit juice which goes through Pasteurization.

There is an en.wikipedia.org page for OpenLearn.
(ii) fractional distillation
https://en.wikipedia.org/wiki/Fractional_distillation  
("It [Fractional distillation] uses distillation to fractionate. Generally the component parts have boiling points that differ by less than 25 °C (45 °F) from each other under a pressure of one atmosphere. If the difference in boiling points is greater than 25 °C, a simple distillation is typically used")
(A) Key to fractional distillation
https://en.wikipedia.org/wiki/Fractional_distillation
(diagram)
is the fractionating column.
(B) How to Purify by Fractional Distillation at Atmospheric Pressure. In About Purification. "Not Voodoo X.4," Department of Chemistry, University of Rochester, undated
www.chem.rochester.edu/notvoodoo ... tional_distillation
("Fractional distillation leads to a better separation than simple distillation because the glass beads in the fractionating column provide "theoretical plates" on which the vapors can condense and then re-evaporate, and re-condense, essentially distilling the compound many times over. One theoretical plate is equivalent to one vaporization-condensation cycle, which is equivalent to one simple distillation. The more volatile liquids will gradually move towards the top of the fractionating column, while higher boiling liquids will stay towards the bottom, giving a better separation between the liquids. The vapor eventually reaches the condenser, where it is cooled and then drips in to the collection vessel. The column used is typically a Vigreux-type (such as Chemglass’ CG-1231 series) and the optimal length is a function of the proximity of the boiling point of the desired material to the impurity. Keep in mind, the longer the Vigreux, the lower the recovery")

theoretical plate
https://en.wikipedia.org/wiki/Theoretical_plate

You do not need to know exactly what it means; I do not. Just use your common sense. Every imaginable step may separate two chemicals a little, and cumulative effects of hundred or thousands of steps will separate two chemicals. In my junior high school in Taiwan, I learned paper chromatography. Later in my graduate school at Chicago, I learned how to use column chromatography (which also contains beads, not made of glass but of resin that have many perforating channels that trap chemicals of different sizes with various efficiency). In both paper and column chromatography (Oxford English Dictionary says it is a mass noun; or both singular and plural are identical), chemicals are separated in liquid medium (water), and the separation was done on paper and inside column, respectively.

The last clause is "the lower the recovery." That means that the longer the fractionating column -- or paper or column in column chromatography -- the better the separation (because different chemicals move in different normal distribution) but you also lose chemicals in the process (chemical adsorb to glass/resin beads or paper.


(c) Riesling
https://en.wikipedia.org/wiki/Riesling  
("is a white grape variety which originated in the Rhine region. Riesling is an aromatic grape variety * * * It is used to make dry, semi-sweet, sweet, and sparkling [4 kinds] white wines")

Its origin is German, original meaning unknown. The s in Riesling is pronounced z, as in German. See Assimov above.
(d)
(i) rosé
https://en.wikipedia.org/wiki/Rosé
(ii) For pronunciation of rosé, see rose
https://www.merriam-webster.com/dictionary/rose
(noun 2 is rosé)
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沙发
 楼主| 发表于 3-24-2021 07:19:40 | 只看该作者
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WINE is hard to imagine without the alcohol. It's integral to its texture, flavor, complexity and, of course, the buzz.Yet interest in alcohol-free wine has grown rapidly over the past couple of years.

According to Nielsen data, retail sales of non-alcoholic wines in the United States shot upward during the year ending Feb 20, rising 34 per cent over those 52 weeks after staying relatively stable from 2016-19. The rise was even more pronounced, 40 per cent, in the last quarter of that year, which included Dry January, a month of voluntary abstinence stoked by social media.

The annual sales, worth roughly US$36 million over the past year, are only a tiny fraction of the entire wine category, which saw more than US$21 billion in that period. Only seven brands of alcohol-free wines had more than US$1 million in sales, Nielsen reported. That's not much compared with other categories of non-alcoholic drinks like beer and cider, which offer a much greater selection than wine.

But interest has nonetheless grown fast enough in the past year that some in the wine trade now see it as an exciting opportunity. "It's the fastest-growing category in our portfolio right now," said Kevin Pike, a proprietor of Schatzi Wines, a small importer and distributor in Milan, New York. "It's up 1,000 per cent and growing every day." Schatzi imports the Eins-Zwei-Zero series of alcohol-free wines from Leitz, an excellent and innovative riesling specialist in the Rheingau region of Germany.

Another importer, Victor O Schwartz of VOS Selections, brings in the Noughty alcohol-free sparkling chardonnay from Thomson & Scott, a merchant best-known for selling Skinny Prosecco. The bottles are intended for the diet-conscious, and Mr Schwartz said the response to the wines has been great.

“I dipped my toe in the water and was amazed at what is happening in the alcohol-free zone,” he said. “I am already working on expanding the category of my portfolio. My customers want a range and we’ll have a sparkling rosé from Noughty soon this summer.

IN THE PAST, wine grape juices and packaged in wine bottles were marketed as an alternative to wine. But grape juice and alcohol-free wines are not at all the same.

Good grape juice can be a wonderful thing - delicious but usually very sweet. Non-alcoholic wine is produced by first making wine. Yeast ferment all or nearly all of the grape sugar into alcohol. Then, the alcohol is removed. The result isn’t more intoxicating than grape juice, but it’s usually not as sweet and fundamentally altered.

What's the appeal? It's not hard to fathom in a pandemic world that has become consumed not only with drinking wine - sales are way up on the alcoholic variety, too - but with healthfulness, mindfulness and the cluster of other self-care practices that are now referred to generally as "wellness".

The option to drink wine without the physical and mental toll possibly exacted by alcohol? Cha-ching! Wine Intelligence, a consumer research organisation, wrote recently that low- and no-alcohol wine was "an unmet consumer need", particularly among younger people.

Practical reasons nonetheless are as important as any driven by social trends. "I am thinking about people who are into fitness and wake up super early to run or work out, people who want to party but are the designated driver, people who want to take a night off from their regular bottle of wine with dinner, people who have to work after dinner," Mr Schwartz said. “All of these people enjoy drinking wine and don’t want to give that up, but are happy not to have alcohol interfere at these times with their busy and active lives.”

"Just these sorts of practical concerns inspired Johannes Leitz of the Leitz winery to try to create a good non-alcoholic wine.

As Leitz tells it, a Norwegian chef, Odd Ivar Solvold, spoke to him a few years ago about the need for a good non-alcoholic wine, particularly in Norway, where the penalty for drunken driving, Solvold told him, was 10 pc of one’s annual income. He wanted something that was balanced and would match his cuisine, and he offered to pay Leitz that same price he got for his conventional wines.

Mr Leitz said he also had a personal desire for a non-alcoholic wine as heart issues were preventing him from consuming as much alcohol as had been customary for him.

Eliminating the alcohol from a wine is not easy, at least, not if the non-alcoholic wine is going to be any good. The boiling point of alcohol, about 173 degrees, is lower than that of water, about 212 degrees. Theoretically, you could simply heat the wine to 173 degrees for as long as it takes to boil off the alcohol. But that crude treatment would harm the flavor components of the wine, too.

Modern technology is more subtle. Both Leitz and Thomson & Scott use vacuum distillation, a process that essentially separates a wine into its constituent parts at relatively low temperatures. The alcohol is then eliminated and the remaining parts reassembled.

Removing the alcohol is no minor surgery for a wine. Not only does it account for the intoxicating effect, it contributes to the body and texture of a wine, as well as the flavors and potential for complexity.

In addition, no matter how relatively gentle the process, the removal of alcohol is nonetheless a harsh technological disruption of a wine. The sense of purity, energy and life that a good wine exudes is impossible in an alcohol-free bottle.

“You can’t compare it with wine,” Leitz said. “It’s different, and you might be a little disappointed, but when you need a good beverage with really good food, mine comes closest to wine.”

In order to compensate for what’s missing, producers need to add something, usually a little sugar or grape juice to round out the texture. But Mr Leitz said that the most important element in making a good non-alcoholic wine is the base wine itself.

“We are the only producer of nonalcoholic wine that uses their own wine,” he said. The riesling he uses, for example, would otherwise go into his Eins-Zwei-Dry, an excellent entry-level dry riesling.

I can't say whether he's really the only one. But I know that for its Noughty sparkling chardonnay, Thomson & Scott, a company based in London, buys chardonnay grapes from the La Mancha region of Spain and then sends the wine to Germany for vacuum distillation. Mr Leitz rents his own unit and does it all on site.

Each of the bottles I tasted, the three from Leitz and the Noughty, was maybe a bit sweet. None would be mistaken for a wine.

My favourite was the Leitz riesling, the still, not the bubbly. It was the only bottle where I could sense the varietal character of riesling - a touch of lime and apricot flashing intermittently.

Leitz's sparkling riesling and sparkling rosé, made of pinot noir, both seemed simpler, as did the Noughty sparkling chardonnay. Partly, I think, this was because carbon dioxide is added to the wine for carbonation, just as with a soft drink. This made them seem inert as opposed to the natural carbonation that makes good sparkling wines feel alive.

Nonetheless, each was tasty, though perhaps more grapey than vinous.

I tasted one other bottle, a Fre Sparkling Brut from Sutter Home, a big American producer of inexpensive American wines. It was not clear what sort of grapes were in the wine, but it was far sweeter than the others, not surprising as the label indicated it was 32 per cent juice. It would not compete with the other bottles.

Mr. Leitz said he sees big things coming for the alcohol-free category. Every month, he says, he receives more and more requests from all over the world to ship his wines.

“It’s always about learning by doing, and I’m really at the start of a huge journey,” said Leitz. “We are only 20% now. We could do a lot, a lot more. “
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