706-79-6Relevant articles and documents
Manufacturing method of 1,2-dichlorohexafluorocyclopentene
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Paragraph 0053-0058, (2019/05/15)
Disclosed is a manufacturing method of 1,2-dichlorohexafluorocyclopentene. The first reaction uses dicyclopentadiene as a starting material and nitrogen gas or another inert gas as a diluting agent in a gas-phase thermal cracking reaction to obtain cyclopentadiene. The second reaction uses cyclopentadiene as a starting material in a liquid phase chlorination reaction with chlorine gas to obtain 1,2,3,4-tetrachlorocyclopentane. The third reaction uses 1,2,3,4-tetrachlorocyclopentane as a starting material in a gas-phase chlorination and fluorination reaction with hydrogen fluoride and chlorine gas in the presence of a chromium-based catalyst to obtain 1,2-dichlorohexafluorocyclopentene. The method uses easily acquired starting material and a stable fluorination catalyst, provides a high yield for a target product, and is applicable for large-scale continuous gas-phase production of 1,2-dichlorohexafluorocyclopentene.
MANUFACTURING METHOD OF 1-CHLOROHEPTAFLUOROCYCLOPENTENE
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Paragraph 0021-0023; 0065; 0066, (2018/02/23)
PROBLEM TO BE SOLVED: To provide a method for manufacturing 1-chloroheptafluorocyclopentene at high yield under a moderate reaction condition. SOLUTION: A manufacturing method of 1-chloroheptafluorocyclopentene includes conducting a gas phase reaction of a raw material and hydrogen fluoride at 290-410°C for 15-40 sec. in presence of a burned body catalyst. The raw material contains at least one of 1,3-dichlorohexafluorocyclopenetene and 1,4-dichlorohexafluorocyclopenetene. The burned body catalyst has Cr, Zr and one or more kind of metal selected from Mg, Ni, Al, Fe, La, Sm, Co, W and Mo. A ratio of the substance quantity of the hydrogen fluoride to the substance quantity of 1,3-dichlorohexafluorocyclopenetene or 1,4-dichlorohexafluorocyclopenetene is preferably 20-50. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
Study on the Preparation of Cr-based Catalysts Doped by Zn using Sol–Gel Auto-Combustion Method and Its Application for Synthesis of 1-Chloro-2,3,3,4,4,5,5-heptafluorocyclopentene
Han, Yajun,He, Jinwei,Wu, Zhenhai,Zhou, Xiaomeng
, p. 1128 - 1138 (2017/10/31)
High-surface-area chromium-based catalysts in the presence of a small amount of zinc were prepared via a sol–gel auto-combustion method using chromic nitrate, zinc nitrate, and citric acid. First, the auto-combustion behavior of the dried gel was investigated by derivative thermogravimetry and (DTG)-TG and infrared (IR) techniques. The results revealed that the dried gel exhibited self-propagating combustion properties. Second, the as-burnt powders were characterized by IR, X-ray diffraction (XRD), Brunauer–Emmett–Teller analysis (BET), and scanning electron microscopy (SEM). The findings showed that the gels were directly converted into CrZn-O nanoparticles with high surface area during the auto-combustion process. Third, the pre-fluorination Cr-Zn catalysts were characterized by XRD, BET, SEM, X-ray photoelectron spectroscopy (XPS), and Fourier transform (FT)-IR spectroscopy of pyridine adsorption techniques. It was found that the presence of zinc led to significant structural changes in the catalyst, the particle size was smaller, the surface area became larger, and more active sites appeared. Finally, the catalytic activities of the samples were tested for the fluorination of 1,2-dichlorohexafluorocyclopentene (1,2-F6) with anhydrous hydrogen fluoride. The obtained results indicated that the pre-fluorination activated Cr-Zn catalysts prepared by this sol–gel auto-combustion method exhibited high efficiency in the synthesis of cyclic hydrofluorocarbons.
