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303-04-8Relevant articles and documents
Gas-phase continuous synthesis method of cis-1,1,1,4,4,4-hexafluoro-2-butene
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Paragraph 0026-0028; 0031-0033; 0036-0038; 0041-0043; 0046, (2020/01/03)
The invention discloses a gas-phase continuous synthesis method of cis-1,1,1,4,4,4-hexafluoro-2-butene. The method includes the following preparation steps: (1) mixing 1,1,1-trifluorotrichloroethane with hydrogen for a reaction so as to obtain a product stream I, transferring the product stream I to a first separation tower, absorbing the mixed product stream obtained at the tower top through a HCl absorption tower, and returning the mixed product stream to a reactor I so as to obtain 1,1,1,4,4,4-hexafluoro-2,3-dichloro-2-butene in the tower kettle; (2) transferring the tower kettle liquid obtained in the step (1) to a preheater II, introducing hydrogen at the same time, performing mixing and preheating until 200 DEG C, transferring the preheated mixture to a reactor II, performing a hydrodechlorination reaction under the action of a catalyst so as to obtain a product stream II, transferring the product stream II to a second separation tower, and circulating the tower kettle liquid tothe reactor II; and (3) transferring the tower top product obtained in the step (2) to a preheater III, performing preheating to 260 DEG C, transferring the preheated product to a reactor III, performing an isomerization reaction under the action of a catalyst so as to obtain a product stream III, transferring the product stream III to a third separation tower so as to obtain cis-1 1,1,4,4,4-hexafluoro-2-butene in the tower kettle.
Preparation method of 1,1,1,2,4,4,4-heptafluoro-2-butene
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Paragraph 0027; 0028; 0229; 0030; 0031; 0036; 0041, (2019/01/07)
The invention discloses a preparation method of 1,1,1,2,4,4,4-heptafluoro-2-butene. The method uses hexachlorobutadiene and hydrogen fluoride as raw materials and uses a chromium-based catalyst as a fluorine-chlorine exchange catalyst to form the 1,1,1,2,4,4,4-heptafluoro-2-butene under gas phase conditions through a plurality of gas-phase catalytic reactions. Compared with the prior art, the preparation method of the 1,1,1,2,4,4,4-heptafluoro-2-butene provided by the invention has the following advantages: 1, the gas phase fluorination method adopted in the method is a cycle fluorination method, has less three industrial wastes (waste water, waste gases and solid waste), and greatly reduces the production costs; 2, the method can realize rapid and multiple-cycle fluorination, improve a product yield, and have simple separation and purification of the product; and 3, the method has the advantages of cheap raw materials, convenient sources and simple operation, and is suitable for industrialized production.
PROCESS FOR THE PREPARATION OF FLUORINATED CIS-ALKENE
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Page/Page column 4, (2011/12/12)
Disclosed is a process for the preparation of fluorine-containing olefins comprising contacting a chlorofluoroalkane with hydrogen in the presence of a catalyst at a temperature sufficient to cause replacement of the chlorine substituents of the chlorofluoroalkane with hydrogen to produce a fluorine-containing olefin. Also disclosed are catalyst compositions for the hydrodechlorination of chlorofluoroalkanes comprising copper metal deposited on a support, and comprising palladium deposited on calcium fluoride, poisoned with lead and reducing the in the presence or absence of a dehydrochlorination catalyst under conditions effective to form a product stream comprising cis-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336).