Method for producing hydrogen fluoride
US-11718523-B2 · Aug 8, 2023 · US
Method for producing hydrogen fluoride
US9656864B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9656864-B2 |
| Application number | US-201013382430-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 24, 2010 |
| Priority date | Jul 6, 2009 |
| Publication date | May 23, 2017 |
| Grant date | May 23, 2017 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
The present invention provides a novel method for producing hydrogen fluoride, which is capable of using various calcium fluoride sources and preventing a second pasty state from occurring, effectively. In a method for producing hydrogen fluoride by reacting calcium fluoride with sulfuric acid, following steps are conducted: (a) a step for mixing and reacting calcium fluoride particles having an average particle diameter of 1-40 μm with sulfuric acid at a sulfuric acid/calcium fluoride molar ratio of 0.9-1.1 under a temperature of 0-70° C. to obtain a solid-state reaction mixture; and (b) a step for heating the solid-state reaction mixture to a temperature of 100-200° C. to react with itself, and thereby producing hydrogen fluoride in a gas phase.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing hydrogen fluoride by reacting calcium fluoride with sulfuric acid, which comprises: (a)(1) conducting raw-material mixing and reacting of calcium fluoride particles having an average particle diameter of 1-40 μm and sulfuric acid at a sulfuric acid/calcium fluoride molar ratio of 0.9-1.1 under a temperature of 0-40° C. to form a first mixture, (a)(2) then heating the first mixture to a temperature higher than the temperature of the raw-material mixing but not higher than 70° C. so that the calcium fluoride particles and sulfuric acid react and form a solid-state reaction mixture; and (b) heating the solid-state reaction mixture to a temperature of 100-200° C. to react with itself, and thereby produce hydrogen fluoride in a gas phase, wherein the reaction mixture remains in the solid state during said heating of the solid-state reaction mixture. 2. A method for producing hydrogen fluoride by reacting calcium fluoride with sulfuric acid, which comprises: (a)(1) conducting raw-material mixing and reacting of calcium fluoride particles having an average particle diameter of 1-40 μm and sulfuric acid at a sulfuric acid/calcium fluoride molar ratio of 1.1-2.2 under a temperature of 0-40° C. to form a first mixture, (a)(2) then heating the first mixture to a temperature higher than the temperature of the raw-material mixing but not higher than 70° C. so that the calcium fluoride particles and sulfuric acid react to form a solid-state reaction mixture; and (b)(1) adding and mixing calcium fluoride particles having an average particle diameter of 1-40 μm to and with the solid-state reaction mixture at a sulfuric acid/calcium fluoride molar ratio of 0.9-1.1 in total for steps (a)(1), (a)(2) and (b)(1) to form a second mixture, and (b)(2) then heating the second mixture to a temperature of 100-200° C. to react with itself, and thereby producing hydrogen fluoride in a gas phase, wherein the reaction mixture remains in the solid state during said heating of the second mixture. 3. The method according to claim 1 , wherein the calcium fluoride particles comprise fluorite, recovered or synthesized calcium fluoride, or a mixture of the fluorite and calcium fluoride. 4. The method according to claim 2 , wherein the calcium fluoride particles comprise fluorite, recovered or synthesized calcium fluoride, or a mixture of the fluorite and calcium fluoride.
Assignees
Inventors
Classifications
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US9656864B2 cover?
- The present invention provides a novel method for producing hydrogen fluoride, which is capable of using various calcium fluoride sources and preventing a second pasty state from occurring, effectively. In a method for producing hydrogen fluoride by reacting calcium fluoride with sulfuric acid, following steps are conducted: (a) a step for mixing and reacting calcium fluoride particles ha…
- Who is the assignee on this patent?
- Yoshimura Toshikazu, Imoto Masayoshi, Sasatani Arata, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification C01B7/192. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 23 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).