Process for the production of high purity magnesium oxide from magnesium chloride

By employing a single-step hot water hydrolysis process and a hydrogen combustion spray drying method, the problem of insufficient magnesium oxide purity was solved, enabling the production of high-purity magnesium oxide, reducing equipment costs and energy consumption, and making it suitable for fermentation processes.

CN122122103APending Publication Date: 2026-05-29PURAC BIOCHEM BV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PURAC BIOCHEM BV
Filing Date
2024-10-16
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In existing technologies, the magnesium oxide produced by the thermal decomposition process of magnesium chloride solution is not pure enough, and the high chloride content has an adverse effect on the fermentation process, requiring high-quality equipment.

Method used

A single-step hot hydrolysis process is adopted, in which magnesium chloride solution is hot hydrolyzed in a spray dryer at a temperature above 300℃, and hydrogen is used as a combustible gas to provide heat, producing high-purity magnesium oxide with a chloride content of less than 2.5%, through a combination of spray drying and calcination.

Benefits of technology

This method enables the production of high-purity magnesium oxide, reduces equipment investment costs, improves conversion rate, and avoids the energy consumption of high-temperature roasting steps and the adverse effects of chlorides on the fermentation process.

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Abstract

The invention relates to a process for converting magnesium chloride into magnesium oxide and HCl, comprising the steps of: - subjecting a magnesium chloride solution having a concentration of 30-50 wt% of magnesium chloride to thermal hydrolysis in a thermal hydrolysis reactor, which is a spray dryer, the reactor being at a temperature of at least 300°C, the heat in the thermal hydrolysis reactor being generated by combustion of a combustible gas provided by a burner, - withdrawing from the thermal hydrolysis reactor a solid magnesium oxide product and a gas stream containing HCl having a temperature of at least 300°C, characterized in that the combustible gas comprises at least 30 mole% of H2, calculated on the total number of moles of combustible compounds in the combustible gas, and in that the solid magnesium oxide product has a content of MgO of at least 97.5 wt% and a sum of basic magnesium chloride and magnesium chloride of less than 2.5 wt% (which corresponds to 1.2 wt% of chlorides), calculated on the total amount of these three components. It has been found that the use of hydrogen as combustible compound allows the formation of a high purity magnesium oxide product, while at the same time the processing temperature in the spray dryer can be kept relatively low. The latter is attractive from an economic point of view. Also claimed is a process for manufacturing a carboxylic acid, wherein the process for converting magnesium chloride into magnesium oxide and HCl is one of the steps.
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