Process for introducing a gas, in particular carbon dioxide, into a liquid, particularly a beverage, flowing through a line, and a device for performing the process

An improvement in a process for introducing carbon dioxide into a liquid flowing through a main line, the improvement residing in withdrawing a portion of said liquid through a by-pass line, introducing carbon dioxide into said liquid while in said by-pass line and returning the carbon dioxide enriched liquid to said main line while adjusting the amount of carbon dioxide introduced into said by-pass line to provide a desired carbon dioxide concentration in said liquid in said main line and a device therefore. The process and device disclosed are especially useful for introducing a gas into a beverage, for example, beer, mineral water, barley water, fruit juices, milk and generally alcoholic and nonalcoholic carbon dioxide containing beverages.