If you read my article on how they made alcohol-free wine you’ll have some context on the processes involved. Believe it or not, the processes involved with making alcohol-free wine are the same as traditional wine. This is one of the reasons why alcohol-free wines can be just as expensive as alcoholic wines, as there are additional processes it needs to go through.
Generally speaking, a wine will either go through one of two processes – distillation or filtration. Distillation is the method by which wine loses its alcohol through the use of steam and a very strong vacuum. Filtration (aka reverse osmosis) uses incredibly high pressure to force the wine through a membrane so fine that it only allows water to pass through and captures those pesky alcohol molecules.
Of course, going through all the above can have an impact on the flavour of alcohol-free wine which is why it can be quite hit and miss. If you want to try decent alcohol-free Champagne or similar alternatives then check out the alcohol-free drink selector tool.