129 results about "Trifluoroethene" patented technology

A process for preparing hydrofluoroether features the reaction between one of trifluoroethene, tetrafluoroethene, hexafluoro propene, etc and one of trifluoroethanol, trifluoropropanol, metanol, etc in organic solvent (DMF or DMSO). Its advantages are high output rate and easy purifying and separating.

This working medium for a heat cycle contains trifluoroethylene and a first component comprising at least one substance selected from carbon dioxide, fluoromethane, trifluoroiodomethane, methane, ethane, propane, helium, neon, argon, krypton, xenon, nitrogen, and ammonia.

To provide a liquid crystal compound having a high stability to light, a high clearing point, a low minimum temperature of a liquid crystal phase, a small viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a suitable elastic constant and an excellent solubility in other liquid crystal compounds. The invention concerns a compound represented by formula (1), a liquid crystal composition containing the compound and a liquid crystal display device including the composition:

The invention relates to a method for preparing hexafluoro-1,3-butadiene. The method comprises the following steps: performing reduction dechloridation on 1,2-dichloro-1,1,-2-halothane with zinc powder to obtain a CF2=CHF gas phase intermediate product, introducing into liquid bromine to carry out an addition reaction, and obtaining CBrF2CHBrF; evaporating CBrF2CHBrF in an evaporator to generate a gas, and using a reaction tube filled with a first catalyst to remove one molecule HBr and generate trifluorovinyl bromide; performing two steps of reactions on the trifluorovinyl bromide under the action of the zinc powder, the solvent and a second catalyst, thereby obtaining the hexafluoro-1,3-butadiene. The method has the advantages of being simple in process, high in yield, easy in raw material obtaining, easy in industrialization, green and environment-friendly.

The invention relates to a method for the co-production of trifluoroethylene and hydrogen fluoride, and is used for producing the trifluoroethylene in a hydrogen fluoride removing manner by taking 1,1,1,3-tetrafluoroethane as a main raw material as well as co-producing the hydrogen fluoride. The method comprises the following steps: mixing HFC-134a (1,1,1,2-tetrafluoroethane) and an inert gas at a molar ratio f 1:(1-20); performing a reaction of removing HF (Hydrogen Fluoride) from the HFC-134a in a fixed bed reactor through an acid catalyst under the conditions that the temperature ranges from 300 to 650 DEG C, the air speed ranges from 300 to 2000h<-1> and the pressure ranges from 0.1 to 0.8Mp; separating tail gas in a first separation tower; pretreating the catalyst and producing an anhydrous hydrogen fluoride product through the cyclic utilization of the separated hydrogen fluoride; realizing the cyclic utilization of the HFC-134a and the inert gas after separating the HFC-134a with a low boiling point, the inert gas and the trifluoroethylene in a second separation tower; performing alkaline cleaning, drying, compression and condensation liquefaction on the trifluoroethylene; then enabling the trifluoroethylene to enter a first rectifying tower; finally drying and packaging the trifluoroethylene treated in the first rectifying tower. The method is suitable for the production of the trifluoroethylene, and belongs to an atomic economic reaction. The two reaction products have important economic values; the conversion rate of the HFC-134a is high; the selectivity and yield of the trifluoroethylene as a main product are high.

Compositions of fluoroelastomers containing copolymerized units of tetrafluoroethylene, propylene, a first cure site selected from the group consisting of i) trifluoroethylene, ii) 3,3,3-trifluoropropene-1, iii) 1,2,3,3,3-pentafluoropropylene, iv) 1,1,3,3,3-pentafluoropropylene, and v) 2,3,3,3-tetrafluoropropene, and a second cure site selected from the group consisting of i) copolymerized units of a brominated cure site monomer, ii) copolymerized units of an iodinated cure site monomer, iii) copolymerized units of a chlorinated cure site monomer, iv) brominated endgroups, v) iodinated endgroups and vi) a combination of any of i)-v) are readily curable with polyhydroxy curing systems. The resulting cured articles have a combination of excellent resistance to alkaline fluids, superior tensile properties and compression set resistance, and excellent adhesion to metal substrates. Optionally, the fluoroelastomers may be dual cured by both a polyhydroxy system and an organic peroxide system.

The invention discloses a catalyst, a preparation method thereof and application thereof. The catalyst takes a porous metal fluoride or an oxyfluoride as a carrier, noble metal palladium or platinum is taken as a main active component, part of elements are added to serve as a promoter, and the catalyst is prepared by adopting a steeping method. The manufactured catalyst is used for gas-phase reaction after filtration, drying, roasting and activation. When used for reaction for gas phase preparation of trifluoroethylene, the catalyst has the advantages of being high in activity and selectivity and long in service life.

Disclosed is a trifluoroethylene recovery method and the device thereof. The method comprises: (1) rectifying and separating step: including rectifying and recovering tetrafluoroethlene product from cracked gas, and loading the distillations containing trifluoroethene, part of tetrafluorethylene and other components into the tetrafluoroethlene recovering step; (2) tetrafluoroethlene recovering step: including rectifying and recovering the distillates containing trifluoroethene and tetrafluorethylene from the distillations containing trifluoroethene, part of tetrafluorethylene and other components; and (3) cycling step: including cycling the distillates containing trifluoroethene and tetrafluorethylene to the rectifying and separating step. The invention is characterized in that: the method further comprises a trifluoroethylene concentration monitoring step before applying the above cycling step; when the trifluoroethylene concentration reaches a predetermined value, the method also comprises a step for rectifying and separating the distillates containing trifluoroethene and tetrafluorethylene.

The invention provides a preparation method and application of trifluoroethyleneoxyphenyl-containing silicone resin. In the process of preparing the organic silicone resin, a trifluoroethyleneoxyphenyl-containing alkoxy silane monomer and various alkoxy silane monomers are hydrolyzed to be subjected to copolymerization to obtain the novel high-temperature cured silicone resin with a high refractive index, good heat resistance and excellent dielectric properties. The silicone resin can be applied to the fields of microelectronic industry, electrical appliances and aerospace as a high-performance resin matrix or packaging material.

The invention discloses a process method for preparing trifluoroethene through the catalytic hydrogenolysis of chlorotrifluoroethylene. Trifluoroethene can be prepared through the hydrogenolysis of hydrogen and chlorotrifluoroethylene under the action of a catalyst in a solvent containing a hydrogen chloride acceptor, wherein the hydrogen chloride acceptor, the solvent, hydrogen and chlorotrifluoroethylene, after the initial feeding, pulse type continuous operation is adopted both for the feeding and discharging of the reaction. The hydrogenolysis is carried out in one or a plurality of reaction kettles connected in series. The invention also discloses a special device for the technical method. The technical method has the advantages that the technical method can realize continuous operation, has a higher conversion rate and selectivity,can be easily applied to the industrialized production; in addition, the dosage of the hydrogen chloride acceptor and the solvent needed by unit chlorotrifluoroethylene is reduced, thereby bringing about obvious economic benefits; and the pulse intermittent feeding and discharging of liquid generate no solid residue in the kettle, thereby facilitating the stability of the reaction kettle.

The invention provides a composition comprising 1,1-difluoroethene (R-1132a), difluoromethane (R-32), 2,3,3,3-tetra-fluoropropene (R-1234yf), optionally carbon dioxide (CO2, R-744), and, optionally, 1,1,2-trifluoroethene (R-1123).

The invention discloses a resource utilization method of tail gas from trifluoroethylene production. According to the invention, addition reaction between the tail gas from the trifluoroethylene production and bromine is performed to generate dibromotrifluoroethane and dibromotrifluoro chloroethane. The preparation method has the following advantages: the technology is simple; reaction condition is mild; purification is easy; and the technology is suitable for large-scale production. The method provided by the invention has effects of energy conservation and emission reduction. The prepared dibromotrifluoroethane can be used to prepare a dry etching gas hexafluorobutadiene, novel gyroscope suspension fluorobromohydrocarbon oil, alpha, beta, beta-trifluorostyrene and an insecticide and acaricide 1,4-diaryl-2,3-difluoro-2-butene. The prepared dibromotrifluoro chloroethane can be used to prepare a plant growth regulator's intermediate ethyl bromodifluoroacetate and a chain transfer agent used as radical polymerization.

The invention relates to a high-density information storage method realized by a piezo response force microscope (PFM) probe. A film forming method that a copolymer solution of vinylidene fluoride and trifluoroethylene is spun on a conductive silicon substrate is adopted for preparing a sample, a PFM probe is applied to apply a force field on the surface of a film after being polarized to change a piezoelectric phase of the polarize film so as to record information, and the information can be erased under the polarization condition of an electric field. The high-density information storage method provided by the invention has a great application prospect in information storage, information can be conveniently stored, and the possibility is provided for achieving high-capacity high-density data storage in nano scale. Compared with the existing storage method, the high-density information storage method provided by the invention has the advantages that an implementation manner is simple, the cost is low and the application range is wide.

The invention provides a function acrylic ester monomer containing perfluor cyclobutyl aryl ether unit, a preparation method and the application thereof. The preparation method comprises a three-step reactions: firstly, thermal cyclization reaction is carried out between trifluoro vinyl aryl ether and trifluoro vinyl (4-methoxyphenyl) ether to produce perfluor cyclobutyl aryl ether, and then methyl is removed to obtain phenol containing perfluor cyclobutyl aryl ether unit, finally, by esterification, acrylic ester monomer containing perfluor cyclobutyl aryl ether unit is obtained. The monomer can be used for preparing polyacrylate polymer containing perfluor cyclobutyl aryl ether unit.

The invention belongs to the technical field of multiferroic films, and concretely relates to a bismuth ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film. The multilayer composite film comprises a PVDF-TrFE thin film and at least one layer of BFO/PVDF-TrFE composite film, and the PVDF-TrFE film is attached to the uppermost BFO/PVDF-TrFE composite film. A preparation method of the multilayer composite film comprises the following steps: dissolving PVDF-TrFE powder to obtain a solution A, and adding BFO nanoscale powder into the solution A to obtain a mixed solution B;taking FTO conductive glass as a substrate, spin-coating the FTO conductive glass with the mixed solution B to prepare a BFO/PVDF-TrFE composite film, drying, and spin-coating the BFO/PVDF-TrFE composite film with the solution A to prepare a PVDF-TrFE film; and then annealing the wet film to obtain a cobalt ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film, and finally plating a platinum point electrode on the cobalt ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film. The bismuth ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film disclosed by the invention not only has low leakage current, but also has relatively high remnant polarization intensity, and is low in process equipment cost, simple in process and high in controllability.

The invention discloses a method for preparing hexafluorobutadiene. The method is realized by carrying out a coupling reaction between trifluorobromoethylene and trifluorovinyl zinc bromide under theaction of a composite catalyst containing a transition metal compound and an organic phosphorus compound. The provided preparation method has the advantages of high reaction yield, low raw material cost, small amount of three wastes, simple process, mild reaction conditions, and simple process operation.