13results about "Preparation by dehalogenation" patented technology

This application provides a method for preparing hexafluorobutadiene, belonging to the field of hexafluorobutadiene manufacturing technology. The method includes the following steps: reacting 1,4-dibromooctafluorobutane, a catalyst solution, and zinc powder under heating conditions and collecting the generated gaseous hexafluorobutadiene; wherein the catalyst solution contains N,N-dimethylformamide, and the reaction temperature is lower than the boiling point of the catalyst solution with a difference of 5℃~40℃; this preparation method can produce hexafluorobutadiene in a one-step reaction using only an industrial-grade catalyst, and has the advantages of simple process steps, low energy consumption, simple catalyst system, low cost, and good safety.

The present invention provides a method for preparing a supported carbon catalyst, the method comprises at least the following steps: (1) contacting a gas containing an organic silicon source with a silicon oxide-based material to obtain a precursor; (2) contacting the precursor with a gas containing an organic carbon source to obtain the supported carbon catalyst. The temperature and energy consumption of the chemical vapor deposition of heteroatom-containing carbon material on silica-based materials can be greatly reduced in this method, and the cost of the catalyst can be effectively reduced.

This invention relates to the field of haloalkanes preparation technology, providing a continuous production method for perfluorobutene and a modified catalyst. The continuous production method for perfluorobutene uses trifluorochloroethylene as raw material and consists of three steps: Step 1, Step 2, and Step 3. The key features are: Step 1 involves the gasification of trifluorochloroethylene followed by continuous contact reaction with a modified catalyst in a fixed bed; Step 2 involves the tail gas being passed into a condenser reactor, which is filled with active zinc powder as a catalyst, and the reactor temperature is maintained at 5–100°C; Step 3 involves the generated and remaining gases in the condenser reactor entering a condenser separator, where solid and liquid separation is performed, and the separated solids and liquids are collected and purified; the modified catalyst is modified using ball milling or impregnation methods, and consists of a metal active center and a support. Therefore, this invention enables continuous production, is highly efficient, environmentally friendly, energy-efficient, and has low production costs, making it suitable for mass production.

A method for producing a halogenated alkene, the method comprising converting a halogenated alkane represented by formula (1) into a halogenated alkene represented by formula (2) and a compound represented by formula (3) in a gas phase in the presence of silicon oxide and an alkali metal element. R1-R3 each independently represent a hydrogen atom, a fluorine atom, a methyl group, a fluorinated methyl group, an ethyl group, or a fluorinated ethyl group, and the number of carbon atoms in each of formulae (1)-(3) is 2-4.

The application discloses a covalently bonded integrated multi-stage core-shell structure hydrogenation dechlorination catalyst and a preparation method and application thereof, and relates to the technical field of catalysts.The application is characterized by a unique carrier-core layer-shell layer covalently bonded integrated configuration, which abandons the traditional physical coating and physical loading combined mode, realizes high-strength chemical bonding of three-layer interfaces through Si-O-C and M-O-P covalent bonds, and overcomes the core defects of weak interface bonding force, easy peeling of the shell layer and easy loss of active components from the root source.Meanwhile, the application relies on the synergistic effect of the asymmetric bimetallic gradient structure and the alloy-oxygen vacancy double active sites, precisely controls the catalyst pore structure and surface acid-base properties, realizes CFC-113 conversion rate of greater than or equal to 99.5%, trifluorochloroethylene selectivity of greater than or equal to 98.5%, and excellent long-period stability of the catalyst against carbon deposition and poisoning, and the catalyst can be continuously and stably operated for more than 2500 hours.

Disclosed herein are a process to prepare and a composition for a solution of a metal-hydride catalyst that includes > 50% of a liquid hydrosilane that is both a solvent component for the metal-hydride catalyst and a reactant in a process to convert HFO-1243zf in a composition or product stream to HFO-1252zc.

The present invention relates to a process for the production of trifluoroethylene in a reactor equipped with a fixed catalyst bed comprising a catalyst, comprising a stage a) of reaction of chlorotrifluoroethylene with hydrogen in the presence of a catalyst and in the gas phase to produce a stream comprising trifluoroethylene, characterized in that stage a) is carried out at a temperature T1 of the fixed catalyst bed between 50°C and 250°C, and that during stage a) the temperature T1 of the fixed catalyst bed is increased, with the proviso that it does not exceed 300°C.

The current invention relates to a process for making a tetrafluoropropene using a tetrafluorochloropropane and / or a pentafluoropropane as starting or intermediate reagents. More specifically, though not exclusively, the present invention relates to a novel method for preparing a tetrafluoropropene by dehydrohalogenating a starting or intermediate tetrafluorochloropropane and / or pentafluoropropane material in the presence of a caustic solution at a temperature range greater than 40°C and less than or equal to 80°C.

This method for producing a first perfluoroalkene compound involves a step for reacting a second perfluoroalkene compound with a perfluoroalkyl iodide in the presence of a fluorinated aluminum chloride-containing catalyst to obtain the first perfluoroalkene compound, wherein the fluorinated aluminum chloride-containing catalyst is obtained by reacting aluminum chloride in the presence of a hydrochlorofluorocarbon to obtain a product and removing at least part of a by-product therefrom; the first perfluoroalkene compound is represented by formula 1; the second perfluoroalkene compound is represented by formula 2; and the perfluoroalkyl iodide is represented by formula 3.