36results 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.

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.

To provide a method for purifying trifluoroethylene, by which from a fluid containing trifluoroethylene, a C1-5 alkane or alkene (excluding trifluoroethylene) in which at least one hydrogen atom may be substituted with a chlorine atom or a fluorine atom can be efficiently removed, and a method for producing trifluoroethylene by which trifluoroethylene can be efficiently produced.A fluid containing trifluoroethylene is brought into contact with at least one type of synthetic zeolite selected from synthetic zeolites 3A, 4A and 5A.

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.

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.

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.

The invention discloses a magnesium fluoride catalyst. The magnesium fluoride catalyst has carbon content of less than 10% and a specific surface area of more than 130 m<2> / g. The magnesium fluoride catalyst provided by the invention has high catalytic activity and strong stability in the dehydrohalogenation reaction, fluorine-chlorine exchange reaction, disproportionation reaction or hydrofluorination reaction.

The invention relates to a method for catalyzing 2, 5-dichlorotoluene reaction by a modified H type molecular sieve, and belongs to the technical field of chlorotoluene derivatives. The method comprises the following steps: dissolving Cu(NO3)2 3H2O into distilled water, fully mixing and stirring with an H type molecular sieve after completely dissolving, standing for 12 hours under a condition that the environment temperature is 110 DEG C after standing and drying, and drying in a muffle furnace of which the temperature is 400 DEG C for 2 hours; performing a modified molecular sieve, grinding, sieving, and selecting sieved molecular sieve particles as a catalyst; filling a constant-temperature zone of a fixed bed reactor with the catalyst; conveying raw materials to the fixed bed reactor through a constant flow pump, and continuously bringing rapidly vaporized raw material steam in the constant-temperature zone into a catalyst bed layer through a gas; finally collecting a product through water bath condensation. According to the method disclosed by the invention, the modified H type molecular sieve is adopted as the catalyst, no toxicity and no harm exist, better stability and higher catalytic activity are obtained, cyclic and repeated utilization can be carried out, and sustained industrial production is facilitated.

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.

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 invention concerns a chemical reaction process performed in a reaction chamber (1) which contains a catalyst bed, the reaction chamber (1) comprising a first end (2) and a second end (3), opposite the first end (2), the process involving alternately: a reaction phase, in which a reaction flow passes through the reaction chamber (1) from its first end (2) towards its second end (3); and a catalyst-regeneration phase, in which a regeneration flow passes through the reaction chamber (1) from its second end (3) towards its first end (2). The reaction chamber (1) preferably consists of a plurality of separate reaction compartments containing a catalyst bed and a heat-exchange system for exchanging heat therebetween.

To provide a method for purifying trifluoroethylene, by which from a fluid containing trifluoroethylene, a C1-5 alkane or alkene (excluding trifluoroethylene) in which at least one hydrogen atom may be substituted with a chlorine atom or a fluorine atom can be efficiently removed, and a method for producing trifluoroethylene by which trifluoroethylene can be efficiently produced.A fluid containing trifluoroethylene is brought into contact with at least one type of synthetic zeolite selected from synthetic zeolites 3A, 4A and 5A.

A method for producing 1,3,3,3-tetrafluoropropene (HFO-1234ze, or 1234ze) from 1-chloro-3,3,3-trifluoropopene (HCFO-1233zd, or 1233zd). In one embodiment, HFO-1233zd is subjected to a disproportionation reaction in the presence of a catalyst at an elevated temperature to produce HFO-1234ze as well as 3,3-dichloro-1,1-difluoropropene (HCFO-1232zc). The catalyst may be at least one of a chromium oxyfluoride catalyst, a chromium oxide catalyst, or a metal fluoride catalyst. The reaction may be conducted in the vapor phase at a temperature between 100° C. and 450° C. Advantageously, in the present method, substantially no hydrogen fluoride (HF) is used as a reactant, and substantially no HF is produced as a product.

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 invention relates to a process for modifying the fluorine distribution in a hydrocarbon compound, comprising a step of making contact between said hydrocarbon compound and a catalytic composition comprising a chromium-based catalyst, said process being performed in a reactor made of a material comprising a base layer made of a material M1 and an inner layer made of a material M2, said base layer and said inner layer being laid against each other by bonding.

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.

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).

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 invention relates to a method for catalyzing 2, 5-dichlorotoluene reaction by a modified H type molecular sieve, and belongs to the technical field of chlorotoluene derivatives. The method comprises the following steps: dissolving Cu(NO3)2 3H2O into distilled water, fully mixing and stirring with an H type molecular sieve after completely dissolving, standing for 12 hours under a condition that the environment temperature is 110 DEG C after standing and drying, and drying in a muffle furnace of which the temperature is 400 DEG C for 2 hours; performing a modified molecular sieve, grinding, sieving, and selecting sieved molecular sieve particles as a catalyst; filling a constant-temperature zone of a fixed bed reactor with the catalyst; conveying raw materials to the fixed bed reactor through a constant flow pump, and continuously bringing rapidly vaporized raw material steam in the constant-temperature zone into a catalyst bed layer through a gas; finally collecting a product through water bath condensation. According to the method disclosed by the invention, the modified H type molecular sieve is adopted as the catalyst, no toxicity and no harm exist, better stability and higher catalytic activity are obtained, cyclic and repeated utilization can be carried out, and sustained industrial production is facilitated.

The present invention relates to metathesis syntheses for insect sex-attractant pheromones or their components, such as E-5-decenyl acetate, the major component of the Peach Twig Borer pheromone; (5R, 6S)-6-acetoxy-5-hexadecanolide, the mosquito oviposition attractant pheromone; E9, Z11-hexadecadienal, the pecan nut casebearer moth pheromone; 9-tetradecenyl formate, an analog of the Diamondback Moth (DBM) pheromone; 11-tetradecenyl acetate, the Omnivorous Leafroller (OLR) pheromone; E-4-tridecenyl acetate, the major component of the Tomato Pinworm (TPW) pheromone; E,E-8,10-dodecadienol, the Codling Moth (CM) pheromone. The syntheses preferably employ a Class I-IV metathesis catalyst, entail few reaction steps, use generally commercially available starting materials, and have relatively short process times. These syntheses produce good yields without the need for expensive or sophisticated equipment. The invention also provides an inexpensive route for producing omega-haloalkenols by cross-metathesizing alpha-omega-diacetoxy alkenes and alpha-omega-dihalides to yield omega-haloalkenols, which are easily converted into omega-haloalkanols under traditional hydrogenation methods.

The present invention relates to the pyrolysis of hydrochlorofluorocarbons to form fluoromonomers such as tetrafluoroethylene, the pyrolysis being carried out in a reaction zone lined with nickel and mechanically supported by a jacket of other corrosion resistant metal, the nickel lining providing an improved yield of valuable reaction products.