摘要:
1,1,1,2-tetrafluoroethane (134a) is prepared by reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane (133a) and hydrofluoric acid with trichloroethylene/133a molar ratios ranging from 5/95 to 50/50, in the presence of a catalyst consisting of Cr.sub.2 O.sub.3 carried on AlF.sub.3.The process provides 134a yields higher than 90% and permits an exceptionally long life of the catalyst. In this way it is possible to realize a continuous process by recycling the unreacted trichloroethylene and 133a, thereby making up for the relatively low global conversion of the reagents.
摘要:
The 1,1,2-trifluoro-1,2-dichloroethane content is reduced or removed from 1,1,1-trifluoro-2,2-dichloroethane by contacting a gaseous mixture comprising said compounds with chrome oxide (Cr.sub.2 O.sub.3) either as such or supported, at temperatures from 180.degree. to 400.degree. C.
摘要翻译:通过使包含所述化合物的气体混合物与氧化铬(Cr 2 O 3)接触,将1,1,2-三氟-1,2-二氯乙烷含量从1,1,1-三氟-2,2-二氯乙烷中还原或除去 或在180°至400℃的温度下负载
摘要:
1,1,1,2-tetrafluoroethane (134a) is prepared by reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane (133a) and hydrofluoric acid with trichloroethylene/133a molar ratios ranging from 5/95 to 50/50, in the presence of a catalyst consisting of Cr.sub.2 O.sub.3 carried on AlF.sub.3.The process provides 134a yields higher than 90% and permits an exceptionally long life of the catalyst. In this way it is possible to realize a continuous process by recycling the unreacted trichloroethylene and 133a, thereby making up for the relatively low global conversion of the reagents.
摘要:
1,1,1-trifluoro-2-fluoroethane (CFC 134a) is purified from 1,1-difluoro-2-chloroethylene (CFC 1122) by reacting a mixture comprising said compounds with hydrofluoric acid, at temperatures from 200.degree. C. to 450.degree. C., in one presence of chrome oxide (Cr.sub.2 O.sub.3) in substantially crystalline form.
摘要翻译:通过使包含所述化合物的混合物与氢氟酸在200℃至200℃的温度下反应,从1,1-二氟-2-氯乙烯(CFC 1122)中纯化1,1,1-三氟-2-氟乙烷(CFC 134a)至 在一定程度上存在基本上结晶形式的氧化铬(Cr 2 O 3)。
摘要:
1,1,1,2-tetrafluoroethane (134a) is prepared by reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane (133a) and hydrofluoric acid with trichloroethylene/133a molar ratios ranging from 5/95 to 50/50, in the presence of a catalyst consisting of Cr.sub.2 O.sub.3 carried on AlF.sub.3.The process provides 134a yields higher than 90% and permits an exceptionally long life of the catalyst. In this way it is possible to realize a continuous process by recycling the unreacted trichloroethylene and 133a, thereby making up for the relatively low global conversion of the reagents.
摘要:
1,1,1-trifluoro-2-fluoroethane (CFC 134a) is purified from 1,1-difluoro-2-chloroethylene (CFC 1122) by reacting a mixture comprising said compounds with hydrofluoric acid, at temperatures from 200.degree. C. to 450.degree. C., in the presence of chrome oxide (Cr.sub.2 O.sub.3) in substantially crystalline form.
摘要翻译:通过使包含所述化合物的混合物与氢氟酸在200℃至200℃的温度下反应,从1,1-二氟-2-氯乙烯(CFC 1122)中纯化1,1,1-三氟-2-氟乙烷(CFC 134a)至 450℃,在基本上呈结晶形式的氧化铬(Cr 2 O 3)存在下进行。
摘要:
Process for preparing pentafluoroethane (HFC-125) wherein 1,1,1-trifluorodichloroethane (HFC-123) is reacted with HF at a temperature from 310° to 380° C., in the presence of a catalyst comprising Cr2O3 supported on preformed AlF3. HFC-125 is obtained with high yields (up to 60-70% and over), high conversions (over 80%) and high selectivity, i.e. formation of by-product in very low amounts (5% by moles at most) Moreover, the catalyst maintains a high activity for a long time also with high organic charges.
摘要翻译:制备五氟乙烷(HFC-125)的方法,其中1,1,1-三氟二氯乙烷(HFC-123)与HF在310℃至380℃的温度下,在载有预先形成的AlF 3的Cr 2 O 3 。 以高产率(高达60-70%及以上),高转化率(超过80%)和高选择性获得HFC-125,即以非常低的量(最多5摩尔%)形成副产物。此外, 催化剂长时间保持高活性,同时也具有高有机电荷。
摘要:
1,1,1,2-tetrafluoroethane (134a) is prepared by reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane (133a) and hydrofluoric acid with trichloroethylene/133a molar ratios ranging from 5/95 to 50/50, in the presence of a catalyst consisting of Cr.sub.2 O.sub.3 carried on AlF.sub.3.The process provides 134a yields higher than 90% and permits an exceptionally long life of the catalyst. In this way it is possible to realize a continuous process by recycling the unreacted trichloroethylene and 133a, thereby making up for the relatively low global conversion of the reagents.
摘要:
1,1,2-trifluoro-1,2-dichloroethane (Al23a) is isomerized to 1,1,1-tri-fluoro-2,2-dichloroethane (Al23) by contacting it with AlF.sub.3 at temperatures ranging from 180.degree. to 400.degree. C. Advantageously, it is operated with mixtures of Al23a with Al23 and/or other chlorofluorocarbons coming from the preparation of Al23 by hydrofluorination of perchloroethylene.