Improved method for processing magnesium chloride solutions and method for manufacturing carboxylic acids
US-2019194029-A1 · Jun 27, 2019 · US
Method for purifying magnesium chloride solutions
US12398047B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12398047-B2 |
| Application number | US-202117792354-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 15, 2021 |
| Priority date | Jan 15, 2020 |
| Publication date | Aug 26, 2025 |
| Grant date | Aug 26, 2025 |
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Abstract
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A process for removing lactic acid from an aqueous lactic acid-containing magnesium chloride solution, the weight ratio of magnesium chloride to lactic acid in the aqueous lactic acid-containing magnesium chloride solution being at least 1:1, the process including the steps of subjecting the aqueous lactic acid-containing magnesium chloride solution to an evaporation step, resulting in the formation of a slurry of MgCl2·MgL2·4H2O in an aqueous magnesium chloride solution, then subjecting the slurry to a solid-liquid separation step, to separate the solid MgCl2·MgL2·4H2O from the aqueous magnesium chloride solution, resulting in the removal of lactic acid from the aqueous lactic acid-containing magnesium chloride solution in the form of MgCl2·MgL2·4H2O. The process makes it possible to efficiently remove lactic acid from aqueous lactic acid-containing magnesium chloride solutions, resulting in magnesium chloride solutions with a low lactic acid content which can be further processed as desired.
First claim
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The invention claimed is: 1. A Process for removing lactic acid from an aqueous lactic acid-containing magnesium chloride solution, the weight ratio of magnesium chloride to lactic acid in the aqueous lactic acid-containing magnesium chloride solution being at least 1:1, the process comprising the steps of subjecting the aqueous lactic acid-containing magnesium chloride solution to an evaporation step, resulting in the formation of a slurry of MgCl 2 ·MgL 2 ·4H 2 O in an aqueous magnesium chloride solution, subjecting the slurry to a solid-liquid separation step, to separate the solid MgCl 2 ·MgL 2 ·4H 2 O from the aqueous magnesium chloride solution, resulting in the removal of lactic acid from the aqueous lactic acid-containing magnesium chloride solution in the form of MgCl 2 ·MgL 2 ·4H 2 O. 2. The process according to claim 1 , wherein the weight ratio of magnesium chloride to lactic acid is at least 1.5:1. 3. The process according to claim 1 , wherein the lactic-acid containing magnesium chloride solution has a magnesium chloride concentration in the range of 5 to 35 wt. %. 4. The process according to claim 1 , wherein the evaporation step is carried out in one or more steps, at a temperature in the range of 50-200° C., or at reduced pressure. 5. The process according to claim 1 , wherein evaporation is continued until the solution has a magnesium chloride concentration in the range of 30-47 wt. %. 6. The process according to claim 1 , wherein the slurry of MgCl 2 ·MgL 2 ·4H 2 O in a magnesium chloride solution comprises at least 2 wt. % of MgCl 2 ·MgL 2 ·4H 2 O and at most 50 wt. % of MgCl 2 ·MgL 2 ·4H 2 O. 7. The process according to claim 1 , wherein the magnesium chloride solution obtained from the separation step has a magnesium chloride concentration in the range of 35-47 wt. %, and/or at most 47 wt. %. 8. The process according to claim 1 , wherein the lactic acid concentration in the magnesium chloride solution obtained from the separation step is at most 1 wt. %. 9. The process according to claim 1 , wherein a lactic acid-containing magnesium chloride solution with a lactic acid concentration of 0.5-7 wt. % and a magnesium chloride concentration of 15-25 wt. % is subjected to one or more evaporation steps, resulting in a slurry of 4-40 wt. % MgCl 2 ·MgL 2 ·4H 2 O in a magnesium chloride solution with a magnesium chloride concentration of 35-47 wt. %, and the slurry is subjected to a solid-liquid separation step resulting in solid MgCl 2 ·MgL 2 ·4H 2 O and a magnesium chloride solution with a lactic acid concentration of less than 0.5 wt. %.
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Classifications
Lactic acid · CPC title
not condensed with other rings · CPC title
Lactic acid · CPC title
by thermal decomposition of magnesium chloride with water vapour · CPC title
Processes or apparatus therefor · CPC title
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- What does patent US12398047B2 cover?
- A process for removing lactic acid from an aqueous lactic acid-containing magnesium chloride solution, the weight ratio of magnesium chloride to lactic acid in the aqueous lactic acid-containing magnesium chloride solution being at least 1:1, the process including the steps of subjecting the aqueous lactic acid-containing magnesium chloride solution to an evaporation step, resulting in the form…
- Who is the assignee on this patent?
- Purac Biochem Bv, Purac Biochem Bv
- What technology area does this patent fall under?
- Primary CPC classification B01D9/0022. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 26 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).