Method for co-producing 2,3,3,3-tetrafluoropropene and trans-1,3,3,3-tetrafluoropropene
US11014861B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2018 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | May 5, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C21/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a method for co-producing 2,3,3,3-tetrafluoropropene and trans-1,3,3,3-tetrafluoropropene, comprising the following steps: preheating a mixture of 1,1,1,2,2-pentachloropropane and 1,1,1,3,3-pentachloropropane together with anhydrous hydrogen fluoride and simultaneously introducing into a first reactor to react in the presence of a catalyst La2O3—Cr2O3 to obtain a first reactor product; directly introducing the first reactor product into a second reactor without separation, and carrying out a catalytic fluorination reaction in the presence of a catalyst Ga2O3—Y2O3—Cr2O3 to obtain a second reactor product; and separating the second reactor product to obtain the products of 2,3,3,3-tetrafluoropropene and trans-1,3,3,3-tetrafluoropropene. The invention has such advantages that the process is simple and less equipment investment is required; used catalysts have good activity, high selectivity and long total life; and the ratio of the two products can be flexibly adjusted according to market demands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.