Carboxylic acid recovery from magnesium carboxylate mixture

Patent metadata

Field	Value
Publication number	US-9422217-B2
Application number	US-201314402441-A
Country	US
Kind code	B2
Filing date	May 23, 2013
Priority date	May 24, 2012
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

The invention is directed to a method for recovering carboyxlic acid from an magnesium carboxylate containing aqueous mixture, including the steps of: contacting the aqueous mixture with an acidic ion exchanger, thereby forming a carboxylic acid mixture and an ion exchanger loaded with magnesium ions; contacting the ion exchanger loaded with magnesium ions with a hydrochloric acid solution, thereby forming a magnesium chloride solution; and thermally decomposing the magnesium chloride solution at a temperature of at least 300° C., thereby forming magnesium oxide (MgO) and hydrogen chloride (HCl).

First claim

The invention claimed is:

1. Method for recovering carboyxlic acid from a magnesium carboxylate containing aqueous mixture, comprising the steps of
contacting the aqueous mixture with an acidic ion exchanger, thereby forming a carboxylic acid mixture and an ion exchanger loaded with magnesium ions; and
contacting the ion exchanger loaded with magnesium ions with a hydrochloric acid solution, thereby forming a magnesium chloride solution; and
thermally decomposing the magnesium chloride solution at a temperature of at least 300° C., thereby forming magnesium oxide (MgO) and hydrogen chloride (HCl),
wherein at least part of the carboxylic acid mixture is fed back to the aqueous mixture.

2. Method according to claim 1 , further comprising
dissolving the HCl in water, thereby obtaining a HCl solution; and
bringing the MgO in contact with water, thereby obtaining Mg(OH) 2 .

3. Method according to claim 2 , wherein the HCl solution is recycled for use in contacting the ion exchanger loaded with magnesium ions.

4. Method according to claim 1 , wherein MgO and/or Mg(OH) 2 is recycled for use in a fermentation process.

5. Method according to claim 1 , wherein the ion exchanger loaded with magnesium ions is washed with water before contacting it with the hydrochloric acid solution.

6. Method according to claim 1 , wherein the acidic ion exchanger is strongly acidic and comprises one or more sulphonic acid and/or phosphonic acid groups.

7. Method according to claim 1 , wherein the acidic ion exchanger is a solid acidic ion exchanger.

8. Method according to claim 1 , wherein the ion exchange step is conducted in an ion exchange column.

9. Method according to claim 1 , wherein the ion exchange step is conducted in a fluidized bed or a simulated moving bed of polymeric ion exchange resin beads.

10. Method according to claim 1 , wherein the acidic ion exchanger is a liquid acidic ion exchanger.

11. Method according to claim 10 , wherein the acidic ion exchanger is an organic compound comprising one or more sulphonic acid and/or phosphonic acid groups, wherein the acidic ion exchanger is optionally dissolved in a hydrophobic solvent.

12. Method according to claim 1 , wherein the carboxylic acid is selected from the group consisting of lactic acid, succinic acid, propionic acid, 3-hydroxypropionic acid, hydroxybutyric acid, citric acid, fumaric acid, itaconic acid, adipic acid, acrylic acid, levulinic acid, maleic acid, terephtalic acid, 2,5-furandicarboxylic acid, lactylic acids and fatty acids.

13. Method according to claim 1 , wherein at least 99 wt. % of the aqueous mixture is in liquid or dissolved form, based on the total weight of the aqueous mixture.

14. Method according to claim 1 ,
wherein contacting the aqueous mixture with the acidic cation exchanger is conducted at a temperature of at least 40° C.

Assignees

• Purac Biochem Bv

Inventors

• Kon Adriaan Dirk
• De Haan André Banier
• Van Der Weide Paulus Loduvicus Johannes
• ÐEKIC ŽIVKOVIC Tanja
• De Koninck Lucien Henri Leander Jozef

Classifications

• B01J49/53

  for cationic exchangers · CPC title

• C01B7/035

  Preparation of hydrogen chloride from chlorides · CPC title

• C01F5/10

  by thermal decomposition of magnesium chloride with water vapour · CPC title

• B01J39/05

  in the strongly acidic form · CPC title

• C07C51/02 Primary

  from salts of carboxylic acids · CPC title