604results about "Preparation by halogen addition" patented technology

A method for preparing 2,3,3,3-tetrafluoroprop-1-ene comprising (a) providing a starting composition comprising at least one compound having a structure selected from Formulae I, II and III:

CX₂═CCl—CH₂X  (Formula I)

CX₃—CCl═CH₂  (Formula II)

CX₃—CHCl—CH₂X  (Formula III)

• • wherein X is independently selected from F, Cl, Br, and I, provided that at least one X is not fluorine;

(b) contacting said starting composition with a first fluorinating agent to produce a first intermediate composition comprising 2-chloro-3,3,3-trifluoropropene and a first chlorine-containing byproduct; (c) contacting said first intermediate composition with a second fluorinating agent to produce a second intermediate composition comprising 2-chloro-1,1,1,2-tetrafluoropropane and a second chlorine-containing byproduct; and (d) catalytically dehydrochlorinating at least a portion of said 2-chloro-1,1,1,2-tetrafluoropropane to produce a reaction product comprising 2,3,3,3-tetrafluoroprop-1-ene.

The invention provides an economic process for the manufacture of 1,3,3,3-tetrafluoropropene (HFC-1234ze) by a two stage process. A hydrofluorination of 1-chloro-3,3,3-trifluoropropene (HCFC-1233zd) into 1-chloro-1,3,3,3-tetrafluoropropane (HCFC-244fa) and 1,1,1,3,3-pentafluoropropane (HFC-245fa) is conducted, followed by the dehydrochlorination of HCFC-244fa and dehydrofluorination of HFC-245fa into HFC-1234ze.

The present invention relates to an improved method for manufacturing 2-chloro-3,3,3,-trifluoropropene (HCFC-1233xf) by reacting 1,1,2,3-tetrachloropropene, 1,1,1,2,3-pentachloropropane, and/or 2,3,3,3-tetrachloropropene with hydrogen fluoride, in a vapor phase reaction vessel in the presence of a vapor phase fluorination catalyst and stabilizer. HCFC-1233xf is an intermediate in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf) which is a refrigerant with low global warming potential.

Disclosed are methods for producing fluorinated organic compounds, including hydrofluoropropenes, which preferably comprises converting at least one compound of formula (I):

CF₃CHXCH₂X   (I)

to at least one compound of formula (II)

CF₃CZCHZ   (II).

where X is independently Cl, Br, I or F, and Z independently is H or F. In certain preferred embodiments, each Z is different.

The present invention discloses a manufacturing process to produce high purity 1234yf from 245eb, which preferably includes the removal of impurities present in 245eb raw material, the dehydrofluorination of 245eb, and the removal of impurities present in final crude product. The disclosed manufacturing process allows the production of a 1234yf product with lower the levels of 1225ye and/or trifluoropropene, preferably in amounts of less than about 500, and 50 ppm, respectively.

The invention refers to a process for the production of high-purity 1,2-dichloroethane from dissolved chlorine and dissolved ethylene, which are brought into contact with each other in a circulating liquid reaction fluid, which mainly consists of 1,2-dichlorethane and a catalyst and flows through at least one vertically arranged loop-type reaction section, both legs of the loop being connected to an overhead degassing vessel from where the reaction product is withdrawn either in gaseous or in liquid state or in both gaseous and liquid state, and numerous admixing sections being arranged in the leg of the loop in which the liquid rises, and each of these admixing sections having one upstream feed point for dissolved or gaseous ethylene and one downstream feed point for dissolved chlorine and, if required, the admixing sections featuring static mixers.

The invention relates to a method for producing high-purity 1,2-dichloroethane from dissolved chlorine and dissolved ethylene which are brought into contact with each other using a circulating liquid reaction medium which essentially consists of 1,2-dichloroethane and a catalyst and passes through at least one reaction loop. The two limbs of the loop are connected to a gas-phase stripping container which is arranged at the top and from which the reaction product is outwardly transferred either in a gaseous or liquid form or both in a gaseous form and in a liquid form. The addition points for the addition of chlorine and dissolved ethylene are arranged in the limb of the loop in which the liquid rises. The addition point for dissolved chlorine is always arranged downstream of the ethylene addition point. At least one addition point for liquid 1,2-dichloroethane follows each chlorine addition point, and the addition of the liquid 1,2-dichloroethane is carried out under kinetic energy which is high enough to enable a vigorous mixture of 1,2-dichloroethane, dissolved chlorine and ethylene to be carried out. Preferably, the liquid 1,2-dichloroethane is added by means of at least one jet mixer.

A method for producing fluorinated organic compounds, including hydrofluoropropenes, which preferably comprises converting at least one compound of formula (I):

CF₃(—CX²X²)_nCX¹═H₂  (I)

to at least one compound of formula (II):

CF₃(CX²X²)_nCX¹═H₂  (II),

where X¹ is Cl, Br or I, each X² is independently selected from the group consisting of H, Cl, F, Br or J, and n is 0, 1, or 2.

Compounds corresponding to formula (I)F2C=CFX(CY2)nBr (I)in which: X represents an atom of oxygen or no atom; Y represents an atom of hydrogen or of fluorine; and n is a whole natural number ranging from 0 to 10 inclusive, excluding bromotrifluoroethylene, 3-bromo-perfluoropropene, 4-bromo-1,1,2,-trifluorobutene, 4-bromo-perfluorobutene-1 and perfluoro(2-bromo-ethylvinyl ester), and their use in the synthesis of fluorinated copolymers then in the synthesis of homosulphonated fluorinated elastomers, exhibiting a low glass transition temperature.

A process for converting gaseous alkanes to olefins, higher molecular weight hydrocarbons or mixtures thereof wherein a gaseous feed containing alkanes is thermally reacted with a dry bromine vapor to form alkyl bromides and hydrogen bromide. Poly-brominated alkanes present in the alkyl bromides are further reacted with methane over a suitable catalyst to form mono-brominated species. The mixture of alkyl bromides and hydrogen bromide is then reacted over a suitable catalyst at a temperature sufficient to form olefins, higher molecular weight hydrocarbons or mixtures thereof and hydrogen bromide. Various methods are disclosed to remove the hydrogen bromide from the higher molecular weight hydrocarbons, to generate bromine from the hydrogen bromide for use in the process, and to selectively form mono-brominated alkanes in the bromination step.

Provided is a continuous process for preparing 1,1,2,3-tetrachloro-1-propene having the steps of catalytically dehydrochlorinating CH₂ClCCl₂CH₂Cl in the gas phase to produce CHCl═CClCH₂Cl; chlorinating the CHCl═CClCH₂Cl to form CHCl₂CCl₂CH₂Cl; and catalytically dehydrochlorinating the CHCl₂CCl₂CH₂Cl in the gas phase to form CCl₂═CClCH₂Cl.

A method comprising: providing a halogen stream; providing an alkane stream; providing a decoking agent; and reacting at least a portion of the halogen stream with at least a portion of the alkane stream in the presence of a halogenation catalyst and the decoking agent to form a halogenated stream.

A method comprising: providing an alkyl halide stream; contacting at least some of the alkyl halides with a coupling catalyst to form a product stream comprising higher hydrocarbons and hydrogen halide; contacting the product stream with a solid reactant to remove at least a portion of the hydrogen halide from the product stream; and reacting the solid reactant with a source of oxygen to generate a corresponding halogen.

A process for converting gaseous alkanes to olefins, higher molecular weight hydrocarbons or mixtures thereof wherein a gaseous feed containing alkanes is reacted with a dry bromine vapor to form alkyl bromides and hydrobromic acid vapor. The mixture of alkyl bromides and hydrobromic acid is then reacted over a suitable catalyst at a temperature sufficient to form olefins, higher molecular weight hydrocarbons or mixtures thereof and hydrobromic acid vapor. Various methods are disclosed to remove the hydrobromic acid vapor from the higher molecular weight hydrocarbons, to generate bromine from the hydrobromic acid for use in the process, and to selectively form monobrominated alkanes in the bromination step.