- detartrating
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6,797,053, filed July 9, 2001:
The crude calcium tartrate used in the production of tartaric acid (min. 50% purity) is recovered from alkaline solutions resulting from the detartrating of wine vats (potentially containing 140-250 g tartaric acid/L) by acidification to a pH of maximum 8, addition of a calcium salt to precipitate calcium tartrate, and recycling of part of the filtrate.
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