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Electrodialysis of multivalent metal salts

A polyvalent metal salt, electrodialysis cell technology, applied in fermentation, membrane technology, chemical instruments and methods, etc., can solve problems such as high equipment capital costs

Inactive Publication Date: 2006-06-07
ELECTROSYNTHESIS
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The process produces large amounts of calcium sulphate waste that must be expensively buried and requires relatively high equipment capital costs due to the need for cation and anion exchange and evaporation of large amounts of water from relatively dilute broths

Method used

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  • Electrodialysis of multivalent metal salts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] The recovery of KLG acid from KLG calcium in a four-compartment electrodialysis stack is illustrated as follows, wherein:

[0036] Produced as Ca(KLG) 2 The fermentation broth containing 12.7% KLG was microfiltered to remove small crystals and treated with activated carbon to remove color and contaminants. Nine 25L batches of this broth passed FuMA-Tech at pH 5.5 TM The first raw material compartment of an ED100 four-compartment laboratory electrodialysis cell equipped with a CaKLG for delivery 2 10 sets of Neosepta CMX-SB cationic and Neosepta AXE-01 anionic membranes, and 10 sets of Neosepta CMX-SB / Neosepta AXE-01 cationic and anionic membranes for HCl delivery. The metathesis pool corresponds to figure 1 pool. The unit area of ​​the metathesis pool is 100cm per membrane 2 The active area, the gap between the membranes is 0.6mm. A constant approximately 0.4 molar aqueous solution of HCl was passed through the second compartment. Concentrated HCl was added to m...

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Abstract

An electrodialysis process carried out in a multi-compartment, preferably a four-compartment electrodialysis cell configuration, in which an inexpensive proton source, preferably from a strong mineral acid, converts multivalent metal salts into valuable acid products, Examples include 2-keto-L-gluconic acid, a precursor to vitamin C, and useful by-products such as calcium chloride.

Description

field of invention [0001] The present invention generally relates to a multi-compartment electrodialysis process for the recovery of acid value from metal salts, particularly polysaccharides which form substantially insoluble precipitates (hydroxides or oxides) upon addition of a base such as calcium salts of gluconic acid derivatives. Valence metal salts. These inventors have discovered that the use of inexpensive acids as proton sources, particularly in electrodialysis cells of four compartment configuration, converts such polyvalent metal salts into the desired acid product and soluble polyvalent salt by-product. Background technique [0002] The recovery of acid value from polyvalent metal salts by electrodialysis has not been achieved because the membranes of electrodialysis cells become fouled with insoluble hydroxide precipitates when the polyvalent metal salts decompose into acid and base components. Four-compartment electrodialysis, also known as double decompositi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/44C12P7/40C12P7/58C12P7/60
CPCB01D61/44
Inventor J·大卫·亨德尔斯丹·哈特苏格
Owner ELECTROSYNTHESIS
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