A process for production of citric acid and monovalent citrate salts

摘要

A short process is disclosed for the production of citric acid in high yield and purity. Conidia of Aspergillus niger are cultured in an aqueous solution of decationized glucose syrup in a fermentation medium whose manganese(II) concentration is 2.5 to less than 20 parts per billion and whose pH value is about 1.5 to about 3.0. The fermentation medium is maintained for about 4-7 days to form citric acid and mycelia pellets in an aqueous product broth. That broth is filtered and then electrodialyzed to form a citric acid-containing aqueous broth. That broth is decolorized and ion-exchanged to remove color and inorganic ions and form an aqueous citric acid solution in which citric acid constitutes at least 98 percent of the organic acid present.