Abstract:
The present invention provides a process for the preparation of trifluoromethyl iodide. The process includes the step of: contacting in a reactor a compound represented by the formula: CF3—W and a compound represented by the formula: Z-I wherein W is selected from CF3, hydrogen and bromine; Z is selected from hydrogen, iodine and chlorine. The step of contacting is carried out, optionally in the presence of a catalyst and further optionally in the presence of air, at a temperature, pressure and for a length of time sufficient to produce the trifluoromethyl iodide.
Abstract:
Disclosed in one embodiment is a process for the synthesis of 1,3,3,3-tetrafluoropropene that comprises (a) reacting a compound of formula (I) X1X2 with a compound of formula (II) CF3CH═CH2 to produce a reaction product comprising a compound of formula (III) CF3CHX1CH2X2, wherein X1 and X2 are each independently selected from the group consisting of hydrogen, chlorine, bromine and iodine, provided that X1 and X2 are not both hydrogen; (b) when X2 in formula (III) is not fluorine, fluorinating the compound of formula (III) to produce a reaction product comprising a compound of formula (III) wherein X1 is as described above and X2 is fluorine; and (c) exposing said compound of formula (III) to reaction conditions effective to convert said compound to 1,3,3,3-tetrafluoropropene. In another embodiment, the process comprises (a) reacting chlorine with a compound of formula (I) CH3CH═CH2 to produce a reaction product comprising a compound of formula (II) CCl3CHC1CH2C1; (b) fluorinating the compound of formula (II) to produce a reaction product comprising a compound of formula (III) CF3CHC1CH2F; and (c) exposing said compound of said formula (III) to reaction conditions effective to convert said compound to 1,3,3,3-tetrafluoropropene.
Abstract:
Disclosed is a process for the synthesis of 1,3,3,3-tetrafluoropropene that comprises, in one preferred embodiment, providing a compound of the formula CF3CH2CHFX, wherein X is a selected from the group consisting of chlorine, bromine and iodine, and exposing said compound to reaction conditions effective to convert said compound to 1,3,3,3-tetrafluoropropene. Other processes for forming 1,3,3,3-tetrafluoropropene are also disclosed.
Abstract:
The invention concerns fluorofunctional statistical polymers of formula (V1), wherein: X, Y and Z represent a hydrogen atom and exhibiting in particular low glass transition temperatures obtained in particular from a B monomer of formula (I): F2CnullCFnullRFnullSO2F, wherein: RF represents one or several vinylidene fluoride units and/or a hexafluoropropene unit and/or a chlorotrifluoroerthylene unit. The crosslinkable fluorosulphonated elastomers thus obtained are advantageously usable for making membranes, polymeric electrolytes, ionomers, membranes for fuel cells in particular hydrogen or methanol fuel cells, for obtaining gaskets and O-rings, rubber hose, pipes, pump bodies, diaphragms, piston heads (used in aeronautics, oil, automotive, mining and nuclear industries) and for plastics processes (as processing aids).
Abstract translation:本发明涉及式(V1)的氟官能统计聚合物,其中:X,Y和Z表示氢原子,特别表现出从式(I)的B单体获得的特别低的玻璃化转变温度:F2C = CF-RF- SO 2 F,其中:RF表示一个或多个偏二氟乙烯单元和/或六氟丙烯单元和/或三氟甲苯单元。 如此获得的可交联氟磺化弹性体有利地用于制造膜,聚合物电解质,离聚物,用于燃料电池,特别是氢或甲醇燃料电池的膜,用于获得垫圈和O形环,橡胶软管,管道,泵体,隔膜,活塞头 (用于航空,石油,汽车,矿业和核工业)和塑料加工(作为加工助剂)。
Abstract:
A liquid phase process is disclosed for producing halogenated alkane adducts of the formula: CAR1R2CBR3R4 (where A, B, R1, R2, R3, and R4 are as defined in the specification) which involves contacting a corresponding halogenated alkane, AB, with a corresponding olefin, CR1R2═C3R4 in a dinitrile or cyclic carbonate ester solvent which divides the reaction mixture into two liquid phases and in the presence of a catalyst system containing: (i) at least one catalyst selected from monovalent and divalent copper; and optionally (ii) a promoter selected from aromatic or aliphatic heterocyclic compounds which contain at least one carbon-nitrogen double bond in the heterocyclic ring. When hydrochlorofluorocarbons are formed, the chlorine content may be reduced by reacting the hydrochlorofluorocarbons with HF. New compounds disclosed include CF3CF2CCl2CH2CCl3, CF3CCl2CH2CH2Cl and CF3CCl2CH2CHClF. These compounds are useful as intermediates for producing hydrofluorocarbons. Azeotropes of CClF2CH2CF3 with HF and azeotropes of CF3CH2CHF2 with HF are also disclosed; as are processes for producing such azeotropes. A process for purification of certain hydrofluorocarbons and/or chloroprecursors thereof from mixtures of such compounds with HF is also disclosed.
Abstract:
A process for the Lewis acid catalyzed addition of trifluoromethanes across the carbon-carbon double bond of fluoroolefins is disclosed. A process for isomerization of monohaloperfluoro alkanes is also disclosed.
Abstract:
Selected novel partially fluorinated &agr;,&ohgr;-dienes can be free radically (co)polymerized to form polymers in which cyclic structures are present. The polymers are useful for films, coatings and molded parts.
Abstract:
Selected partially fluorinated &agr;,&ohgr;-dienes bearing CF3 substitution can be free radically (co)polymerized to form polymers in which cyclic structures are present. The polymers are useful for films, coating and molded parts.
Abstract:
The invention concerns processes for the preparation of fluoroolefins, including a process for the deiodofluorination of an iodine containing fluorocarbon comprising contacting said iodine containing fluorocarbon with a fluoroolefin in the presence of an aluminum chlorofluoride catalyst.
Abstract:
Iodine terminated liquid telechelic telomers of chlorotrifluoroethylene (CTFE) containing an average of more than 1 CTFE unit per molecule are novel compounds. The telomers can be prepared by a photochemically initiated reaction between liquified CTFE and either elemental iodine or the telogen ICF.sub.2 CFClI at temperatures below about 50.degree. C.