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US-2024166513-A1 · May 23, 2024 · US
Method for the production of free flowing synthetic calcium fluoride and use thereof
US9764963B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9764963-B2 |
| Application number | US-201514696652-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 27, 2015 |
| Priority date | Jun 5, 2014 |
| Publication date | Sep 19, 2017 |
| Grant date | Sep 19, 2017 |
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Abstract
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The invention relates to a process for producing free-flowing calcium fluoride particles from a diluted aqueous solution of hydrogen fluoride comprising the step of reacting the diluted aqueous solution of hydrogen fluoride with calcium carbonate particles at a temperature of less than 50° C. The invention further relates to the use of the free-flowing calcium fluoride particles for the manufacturing of anhydrous hydrogen fluoride.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for producing free-flowing calcium fluoride particles from an aqueous solution of hydrogen fluoride comprising the step of reacting the aqueous solution of hydrogen fluoride with calcium carbonate particles at a temperature of less than 50° C., further wherein the aqueous solution of hydrogen fluoride has a concentration of hydrogen fluoride of from 0.5 to 40% and the calcium carbonate particles have a mean particle size (d 50 ) of from more than 30 to less than 50 μm. 2. The process of claim 1 , wherein the diluted aqueous solution of hydrogen fluoride has a concentration of hydrogen fluoride of from 1 to 30%. 3. The process of claim 1 , wherein the specific surface area (BET) of the calcium carbonate particles is ≦10 m 2 /g. 4. The process of claim 1 , wherein the diluted aqueous solution of hydrogen fluoride and the calcium carbonate particles are reacted for from 1 to 10 hours. 5. The process of claim 1 , wherein the reaction temperature is in the range of from 20° C. to less than 50° C. 6. The process of claim 1 , wherein the calcium fluoride content of the free-flowing calcium fluoride particles is at least 88%. 7. The process of claim 1 , wherein the content of calcium carbonate in the free-flowing calcium fluoride particles is 12% or less. 8. The process of claim 1 , wherein the mean particle size (d 50 ) of the free-flowing calcium fluoride particles is from more than 30 to less than 50 μm. 9. The process of claim 1 , wherein the specific surface area (BET) of the calcium fluoride particles is from 40 to 80 m 2 /g. 10. The process of claim 1 , further comprising a neutralization step for unreacted hydrofluoric acid. 11. The process of claim 1 , further comprising the step of adding calcium sulfate. 12. The process of claim 1 , wherein the step of reacting the diluted aqueous solution of hydrogen fluoride with calcium carbonate particles is a continuous flow process. 13. The process of claim 1 , wherein the step of reacting the diluted aqueous solution of hydrogen fluoride with calcium carbonate particles is a batch process.
Assignees
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Classifications
Compositional purity · CPC title
Hydrogen fluoride · CPC title
Preparation from fluorspar · CPC title
Surface area · CPC title
Powder free flowing behaviour · CPC title
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- What does patent US9764963B2 cover?
- The invention relates to a process for producing free-flowing calcium fluoride particles from a diluted aqueous solution of hydrogen fluoride comprising the step of reacting the diluted aqueous solution of hydrogen fluoride with calcium carbonate particles at a temperature of less than 50° C. The invention further relates to the use of the free-flowing calcium fluoride particles for the manufac…
- Who is the assignee on this patent?
- 3M Innovative Properties Co
- What technology area does this patent fall under?
- Primary CPC classification C01F11/22. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 19 2017 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).