L-(+)-Tartaric Acid
The L-(+)-tartaric acid isomer of tartaric acid is industrially produced in the largest amounts.
It is obtained from lees, a solid byproduct of fermentations. The former byproducts mostly consist of potassium bitartrate (KHC4H4O6). This potassium salt is converted to calcium tartrate (CaC4H4O6) upon treatment with milk of lime (Ca(OH)2).
