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US 3,944,606 AGranted
Process of producing alkali metal or ammonium citrates
AssigneeJoh. A. Benckiser GmbH
InventorsManfred Rieger, Johannes Kioustelidis
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Abstract
Alkali metal or ammonium citrates are produced from solutions of citric acid obtained by chemical reaction or by fermentation by extraction by means of a specific water-immiscible mixture of aliphatic amines and organic solvents and re-extracting the resulting organic solvent mixture with an aqueous solution of an alkali metal hydroxide, carbonate or bicarbonate, ammonia, or their salts.
Claims13
In a process of producing alkali metal or ammonium citrates from citric acid solutions produced chemically or by fermentation, by extraction, the steps which comprise
- a. extracting the starting citric acid solution by means of a water-immiscible solvent mixture of an amine of the formula ##EQU4## in which R.sub.1 and R.sub.2 are alkyl radicals with 7 to 15 carbon atoms and
- R.sub.3 is hydrogen or an alkyl radical with 1 to 15 carbon atoms, and
- an organic solvent as extracting agent and
- b. subsequently re-extracting the resulting organic solvent extract with a compound forming alkali metal or ammonium salts of citric acid.
1 more element
Dependencies are inferred from the claim text.