Method for the purification of organic acids
A technology of organic acid and acid solution, applied in chemical instruments and methods, purification by physical methods, purification of sugar juice, etc., can solve problems such as irreversible blocking of membranes
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Embodiment 1
[0078] The fermented wort from a so-called lime method is acidified with a sulfuric acid treatment, whereby the gypsum formed is removed by filtration. The resulting aqueous medium then contains calcium sulfate, which is the majority of the ions present in the filtrate. The solution was treated with a strong XA2033, XA2023 type cation resin from APPLEXION and regenerated with hydrochloric acid to first remove polyvalent cations (and some monovalent cations). The resulting solution then contains species originating from ion exchange. The solution was then nano-filtered with a Persep 100 or 200 membrane from APPLEXION. The resulting permeate was subsequently demineralized by ion exchange (Appplexion company types XA2023 and XA3061) and concentrated by evaporation.
[0079] In the nanofiltration stage, the polyvalent anion SO 4 The majority is concentrated in the resulting retentate as well as the glucose polymer and the macromolecule. At this stage, in particular, an effecti...
Embodiment 2
[0083] This example is in figure 2 Implemented on the facilities described. In this example, the lactic acid fermentation wort, after treatment with sulfuric acid, was passed through a strong monovalent cationic resin of the type XA2023 from APPLEXION. After decalcification, it was found that most of the sulfate ions existed in solution as sodium sulfate or potassium sulfate, which were easily soluble and easily retained by nanofiltration membranes. The separation as in Example 1 was carried out with the sulfate ions in the retentate. Permeation filtration treatment of this retentate (before precipitation) makes it possible to recover the lactic acid it contains and thus improve the overall yield of the process. As in Example 1, the permeate was subsequently demineralized.
[0084] The eluate from regeneration of the decalcified resin is rich in soluble CaCl and is treated with nanofiltration to concentrate the CaCl in a retentate 2 And a nearly pure sodium chloride or po...
Embodiment 3
[0090] In this example, the starting material is a fermented wort according to the ammonium hydroxide method; in this case the organic acid is in neutralized form. In this case, most of the lactic acid is in the form of ammonium lactate. through the strong H + Type cationic resin can remove the calcium salt in the medium with the method similar to Examples 1 and 2. The resin is of a size that essentially only exchanges divalent ions (an acidification may optionally occur, but not complete hydrolysis). This nanofiltration treatment may remove colourants, macromolecules, proteins and glucose polymers, and, similar to Examples 1 and 2, sulfates in the form of sodium sulfate, potassium sulfate or ammonium sulfate.
[0091] The permeate rich in ammonium lactate is then hydrolyzed and treated with a strong H + Type cationic resin acidification treatment, the resin is regenerated with sulfuric acid after recovering a molecular lactic acid solution. Regeneration with sulfuric acid...
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