Method for producing chloropropene and method for producing 2,3,3,3-tetrafluoropropene
US10173952B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2015 |
| Grant date | Jan 8, 2019 |
| Priority date | — |
| Expiry date | Jun 16, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention provides a method for stably producing 2,3,3,3-tetrafluoropropene for a long period of time wherein unreacted materials are reused after distillation without liquid-liquid separation to suppress catalyst deactivation. The method for producing 2,3,3,3-tetrafluoropropene comprises the step of reacting 1233xf or like chloropropene with hydrogen fluoride in the presence of a catalyst, the step of subjecting the reaction mixture obtained in the above step to distillation to separate the mixture into a first stream comprising 2,3,3,3-tetrafluoropropene as a main component and a second stream comprising unreacted hydrogen fluoride and organic matter containing unreacted chloropropene as main components, and the step of recycling the second stream to the above reaction, the distillation being performed under conditions in which the unreacted hydrogen fluoride and the organic matter containing the unreacted chloropropene do not undergo liquid-liquid separation at a portion of a distillation column from which the second stream is withdrawn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.