Method for producing and purifying 2,3,3,3-tetrafluoro-1-propene
US-2018370880-A1 · Dec 27, 2018 · US
Method for producing hexafluorobutadiene
US11097997B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11097997-B2 |
| Application number | US-201816757501-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 23, 2018 |
| Priority date | Oct 23, 2017 |
| Publication date | Aug 24, 2021 |
| Grant date | Aug 24, 2021 |
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Abstract
Official abstract text for this publication.
By subjecting a starting material composition containing hexafluorobutadiene and at least one additional compound selected from the group consisting of octafluoro-1-butene, octafluoro-2-butene, heptafluoro-1-butene, and heptafluoro-2-butene to extractive distillation in the presence of an extraction solvent to reduce the concentration of the additional compound, hexafluorobutadiene with higher purity can be obtained.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing hexafluorobutadiene, comprising a step of subjecting a starting material composition containing hexafluorobutadiene and at least one additional compound selected from the group consisting of octafluoro-1-butene, octafluoro-2-butene, and heptafluoro-2-butene to extractive distillation in the presence of an extraction solvent to reduce the concentration of the additional compound. 2. The production method according to claim 1 , wherein the extraction solvent contains at least one compound selected from the group consisting of oxygen-containing hydrocarbons and halogen-containing hydrocarbons. 3. A method for separating hexafluorobutadiene and at least one additional compound selected from the group consisting of octafluoro-1-butene, octafluoro-2-butene, and heptafluoro-2-butene, the method comprising a step of subjecting a composition containing hexafluorobutadiene and the additional compound to extractive distillation in the presence of an extraction solvent. 4. The method according to claim 3 , wherein the extraction solvent contains at least one compound selected from the group consisting of oxygen-containing hydrocarbons and halogen-containing hydrocarbons. 5. A composition containing hexafluorobutadiene and at least one additional compound selected from the group consisting of octafluoro-1-butene, octafluoro-2-butene, and heptafluoro-2-butene, wherein the additional compound is contained in an amount of less than 0.1 mol % per 100 mol % of the total amount of the composition. 6. An azeotropic composition containing hexafluorobutadiene and at least one additional compound selected from the group consisting of octafluoro-1-butene, octafluoro-2-butene, and heptafluoro-2-butene. 7. The composition according to claim 5 , for use in an etching gas, a refrigerant, a heat transfer medium, a foaming agent, or a resin monomer. 8. The composition according to claim 6 , for use in an etching gas, a refrigerant, a heat transfer medium, a foaming agent, or a resin monomer.
Assignees
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Classifications
- C07C17/386Primary
with auxiliary compounds · CPC title
Etching, surface-brightening or pickling compositions (for glass C03C15/00, {C03C25/66; for mortars, concrete, artificial or natural stone or ceramics C04B41/5338}; for metallic material C23F, C23G1/00, C25F1/00; {for semi-conductors H10P52/40}) · CPC title
Halogenated butadienes · CPC title
containing fluorine · CPC title
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Frequently asked questions
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- What does patent US11097997B2 cover?
- By subjecting a starting material composition containing hexafluorobutadiene and at least one additional compound selected from the group consisting of octafluoro-1-butene, octafluoro-2-butene, heptafluoro-1-butene, and heptafluoro-2-butene to extractive distillation in the presence of an extraction solvent to reduce the concentration of the additional compound, hexafluorobutadiene with higher …
- Who is the assignee on this patent?
- Daikin Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification C07C17/386. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 24 2021 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).