35results about "Preparation by halogenatd hydrocarbon disproportionation" patented technology

An improved continuous process for converting methane, natural gas, or other hydrocarbon feedstocks into one or more higher hydrocarbons or olefins by continuously cycling through the steps of alkane halogenation, product formation (carbon-carbon coupling), product separation, and regeneration of halogen is provided. Preferably, the halogen is continually recovered by reacting hydrobromic acid with air or oxygen. The invention provides an efficient route to aromatic compounds, aliphatic compounds, mixtures of aliphatic and aromatic compounds, olefins, gasoline grade materials, and other useful products.

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.

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.

The present invention relates to the process of pyrolyzing tetrafluoroethylene to hexafluoropropylene by carrying out the pyrolysis in a tubular reactor that is lined with either nickel or nickel alloy which contains no greater than 8 wt % chromium.

The invention discloses a method for synthesizing perfluoro-alkyl iodide through telomerization. The method is as follows: short-carbon chain perfluoro-alkyl iodide and tetrafluoroethylene are added in an extraction column reactor filled with catalyst filler inside an extraction tower or a rectification tower reactor taking catalyst as filler so as to carry out reaction with the molar ratio between short-carbon chain perfluoro-alkyl iodide and tetrafluoroethylene of between 3:1 and 50:1 at a reaction temperature of between 40 and 200 DEG C, thereby obtaining perfluoro-alkyl iodide. The method takes the lead in taking the extraction column filled with catalyst filler inside the extraction tower or the rectification tower taking catalyst as filler as a reactor which is used in the telomerization of perfluoro-alkyl iodide; moreover, compared with the prior disclosed art, the method has the advantages of simple production equipment, easily controlled technological parameter, better operational safety, ideal reaction selectivity, high product purity and no hydrogen-containing byproducts, etc.

The present invention relates to a cation-exchanged zeolite catalyst for an transiodination and a process for producing mono-iodo benzene by using it. Particularly, the cation-exchanged zeolite catalyst has a molar ratio of Si/Al from 5 to 100 and is ion-exchanged with an alkali metal or an alkaline earth metal in range of 2% to 50% of ion exchange capacity.

Further, the process for producing mono-iodo benzene of the present invention comprises the step of performing a transiodination by using the cation-exchanged zeolite catalyst to produce mono-iodo benzene from reactants including benzene and one or more multi-iodo benzenes selected from the group consisting of di-iodo benzene and tri-iodo benzene.

Disclosed is a process for making hexafluoro-2-butyne comprising the steps of: (a) providing a composition comprising CF₃CX═CXCF₃, where X=halogen; and (b) treating CF₃CX═CXCF₃ with a dehalogenation catalyst in the presence of a halogen acceptor compound Y, where Y is not hydrogen. The halogen acceptor compound Y is a material capable of being halogenated, preferably a compound having a multiple bond, such as an alkyne, alkene, allene, or carbon monoxide. Another suitable material capable of being halogenated is a cyclopropane. A catalyst effectively transfers halogen from CF₃CX═CXCF₃ to the halogen acceptor compound. Since Y is not hydrogen, the formation of CF₃CX═CHCF₃ is greatly reduced or eliminated.

The present invention relates to a method of producing methyl chloride by multistage reactions. The method of the present invention comprises: a) a chlorination step for sufficiently increasing the conversion rate of methane, which is an initial reactant; and b) a subsequent reaction step for actively utilizing hydrogen chloride (HCl), which is a hazardous byproduct of chlorination, such that the method can efficiently treat harmful hydrogen chloride, and at the same time, can improve the overall production of methyl chloride.

A method for producing at least one compound of a fluorine-containing olefin compound (51) or a fluorine-containing olefin compound (52) includes performing a reaction of a fluorine-containing olefin compound (21) with an olefin compound (31) in the presence of a metal-carbene complex compound having an olefin metathesis reaction activity and an olefin compound (41) or (42).

The present disclosure provides compounds, compositions, and methods for preparing alkenyl halides and/or haloalkyl-substituted olefins with Z-selectivity. The methods are particularly useful for preparing alkenyl fluorides such as CF₃-substituted olefins by means of cross-metathesis reactions using halogen-containing molybdenum and tungsten complexes.

Provided is an economically advantageous method for efficiently and at a high purity producing HFO-1123, which is industrially useful, by means of a synthesis reaction that uses easily acquired starting materials, does not use a catalyst, and accompanies pyrolysis, in a manner such that the generation is suppressed of by-products difficult to separate by means of distillation from HFO-1123, particularly HFO-1132(E). The method for producing HFO-1123 from R31, R22, and TFE has (a) a step for supplying R31, R22, and TFE to a reaction vessel in a separate or pre-mixed manner, (b) a step for supplying a heat medium to the reaction vessel, and (c) a step for generating HFO-1123 by contacting R31, R22, TFE, and the heat medium together in the reaction vessel in the state of the temperature of within the reaction vessel being controlled to 400-950 DEG C.

The present invention relates to the metathesis synthesis of insect attractant pheromones or their components, such as E-5-decenyl acetate, the main component of peach resin moth pheromone; (5R, 6S)-6-acetoxy-5 - hexadecadienal (hexadecadienal), a mosquito egg-laying sex attractant pheromone; or E9, Z11-hexadecadienal (hexadecadienal), a larval moth of the hickory moth Pheromones; 9-tetradecenyl formate, an analogue of the diamondback moth (DBM) pheromone; 11-tetradecenyl acetate, an Omnivorous Leafroller (OLR) pheromone; E-4-Tridecenyl acetate, a tomato Main constituents of pheromones from boxworm moth (TPW); E, E-8,10-dodecadienol, codling moth (CM) pheromone. The synthesis preferably employs Class I-IV metathesis catalysts, requires few reaction steps, employs commonly commercially available starting materials, and has relatively short processing times. These syntheses have good yields and do not require expensive or sophisticated equipment. The present invention also provides an inexpensive route to produce ω-haloalkenols, which are easily converted to ω-haloalkanols under conventional hydrogenation methods, by cross-metathesis of α-ω-diacetoxyalkenes and α-ω-dihalides.