C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/48 (2006.01) C07C 59/265 (2006.01) C12P 7/48 (2006.01)
Patent
CA 2043152
The process comprises i) subjecting said citric acid fermentation broth to evaporation to produce a concentrate with a citric acid concentration of at least 80% of the saturation value at the evaporation temperature; ii) subjecting such concentrate to an extraction operation with a recycled amine extractant citric acid solution in which the citric acid concentration is below the equilibrium value which corresponds to the broth concentrate at the extraction temperature, to produce a more concentrated amine extractant citric acid solution and an aqueous citric acid raffinate; iii) withdrawing the aqueous extraction raffinate from said extraction operation, bleeding off a small fraction thereof and recycling the balance to the said evaporation; iv) withdrawing the said concentrated amine extractant citric acid solution extract and back- extracting it with water to obtain an aqueous citric acid solution and a depleted amine extractant citric acid solution the concentration of which is below the equilibrium value which corresponds to the broth concentrate; and v) recycling said depleted amino extractant citric acid solution to the extraction operation.
Baniel Avraham
Gonen David
Cargill Incorporated
Macrae & Co.
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