Method for producing fluorinated organic compounds
US-2015361014-A1 · Dec 17, 2015 · US
Method for producing 2,3,3,3-tetrafluoropropene
US2016297730A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016297730-A1 |
| Application number | US-201615190550-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jun 23, 2016 |
| Priority date | Jul 12, 2013 |
| Publication date | Oct 13, 2016 |
| Grant date | — |
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Abstract
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This invention provides a method for producing 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, in two or three reaction steps, using at least one chlorine-containing compound selected from the group consisting of 1,1,1,2,3-pentachloropropane, 2,3-dichloro-1,1,1-trifluoropropane, and 1,1,2,3-tetrachloropropene as a starting material, the reaction products of at least two of the steps being supplied to the same distillation apparatus to subject the products to a separation operation simultaneously. With this method, 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, can be efficiently produced with reduced energy and equipment costs in an economically advantageous manner.
First claim
Opening claim text (preview).
1 - 3 . (canceled) 4 . A method for producing 2,3,3,3-tetrafluoropropene, comprising the reaction steps of: (1) obtaining 2-chloro-1,1,1,2-tetrafluoropropane by adding hydrogen fluoride to 2-chloro-3,3,3-trifluoropropene; and (2) obtaining 2,3,3,3-tetrafluoropropene by dehydrochlorination of the 2-chloro-1,1,1,2-tetrafluoropropane, the method further comprising the step of supplying the products of reaction step (1) and the products of reaction step (2) to the same distillation apparatus to separate the products into a hydrogen chloride-containing fraction and a fraction substantially free of hydrogen chloride. 5 . The method for producing 2,3,3,3-tetrafluoropropene according to claim 4 , further comprising the step of removing hydrogen chloride from the hydrogen chloride-containing fraction. 6 . The method for producing 2,3,3,3-tetrafluoropropene according to claim 5 , further comprising the step of recycling all or part of the fraction from which hydrogen chloride has been removed to at least one of the reaction steps. 7 . The method for producing 2,3,3,3-tetrafluoropropene according to claim 4 , further comprising the step of collecting 2,3,3,3-tetrafluoropropene from the hydrogen chloride-containing fraction and/or the fraction substantially free of hydrogen chloride. 8 . The method for producing 2,3,3,3-tetrafluoropropene according to claim 4 , further comprising the step of recycling all or part of the fraction substantially free of hydrogen chloride to at least one of the reaction steps. 9 - 14 . (canceled)
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Classifications
the other compound being HX · CPC title
- C07C17/087Primary
to unsaturated halogenated hydrocarbons · CPC title
Recycling of unreacted starting or intermediate materials · CPC title
two or more compounds being involved in the reaction · CPC title
by distillation · CPC title
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Frequently asked questions
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- What does patent US2016297730A1 cover?
- This invention provides a method for producing 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, in two or three reaction steps, using at least one chlorine-containing compound selected from the group consisting of 1,1,1,2,3-pentachloropropane, 2,3-dichloro-1,1,1-trifluoropropane, and 1,1,2,3-tetrachloropropene as a starting m…
- Who is the assignee on this patent?
- Daikin Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification C07C17/087. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Oct 13 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). 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).