42 results about "Electrochemical fluorination" patented technology

A process for manufacturing fluoroolefins comprising perfluorinating a starting material comprising at least one carbon-bonded hydrogen by electrochemical fluorination, dissociating this separated effluent in a pyrolysis, quenching and separating the effluent to yield tetrafluoroethylene and / or hexafluoropropylene.

The invention discloses a method for preparing perfluoromethyl isobutyrate by electrochemical fluorination. The method comprises the following steps: taking methylacrylic acid and a derivative thereofas a starting material; carrying out electrochemical fluoridation on the starting material and hydrogen fluoride in an electrochemical reactor to obtain a gaseous product; feeding the obtained gaseous product in a methanol solution and fully reacting and esterifying; and distilling reaction liquid to collect the product. Methacrylic anhydride and the derivative thereof are used as the raw material, and the problem that isobutyric anhydride is isomerized in an electrochemical fluorination process is solved. The method has the characteristics of good reaction selectivity, zero isomer by-productand high yield.

The invention relates to a method for preparing trifluoromethyl sulfuryl fluoride CF3SO2F by electrochemical fluorination of methanesulfonyl fluoride CH3SO2F, the steps of the method are as follows: (1) water in HF is dehydrated through electrochemical method, and the anhydrous HF after dehydration is used as the reactant of CH3SO2F fluoridation at the third step and the solvent of the electrolyte; (2) water in the methanesulfonyl fluoride CH3SO2F is dehydrated through electrochemical method, and the anhydrous CH3SO2F after dehydration is used as the reactants of the electrochemical fluorination reaction at the third step; (3) for the anhydrous HF obtained at the first step and the anhydrous methanesulfonyl fluoride CH3SO2F obtained at the second step, the electrochemical fluorination reaction is conducted, gas-phase outlets of an electrochemical reactor 3 are trifluoromethyl sulfuryl fluoride CF3SO2F, hydrogen H2 and mixture formed through HF volatilization. The advantages of the invention are as follows: the preparation method is simple, the current efficiency of the product of electrochemical fluorination and the safety during the fluorination operation procedure are increased.

The invention discloses a method for preparing a rare-earth oxide by using electrochemical fluorination residues generated by electrolyzing rare-earth metals. The method comprises the steps of treating, calcining, crushing, leaching and filtering raw materials, preparing the rare-earth oxide and the like. Compared with an alkaline method, the method has the advantages of simple process, short flow, easily controlled manufacture operation, low cost, small wastewater drainage and over 95 percent of recovery rate; and meanwhile, the method has strong adaptability to raw materials, can treat the electrochemical fluorination residues, rare-earth catalyst waste, waste battery scarp and the like, and can treat phosphor-containing xenotime and monazite.

The invention discloses an electrochemistry fluorination electrolytic bath. The electrochemistry fluorination electrolytic bath comprises a bath body (1), a bath cover (2), a bath body side wall temperature control clamping sleeve (3), a bottom discharge valve (4), electrode sets (5), anode conductive rods (6), cathode conductive rods (7) and a conductive cross beam (8). Each electrode set is structurally characterized in that plate electrodes are fixed with fixing shafts (15) penetrating plate electrode center holes (19), the interval between the plate electrodes is controlled by annular insulation pads (17), and the fixing shafts fix the plate electrodes into one electrode set through insulation nuts (16) at the two ends. The conductive cross beam is of a hollow-out structure, electrode screw rods (20) on the plate electrodes penetrate through the hollow-out structure to be fixed on the conductive cross beam, and the conductive cross beam and the bath cover (2) are assembled together through the anode conductive rods (6) and the cathode conductive rods (7). The electrochemistry fluorination electrolytic bath has the advantages of being large in capacity, high in space utilization rate, large in effective electrolytic area and the like. The plate electrodes are movably connected with the conductive cross beam, dismounting is convenient, and assembly is easy.

A process for manufacturing fluoroolefins comprising perfluorinating a starting material comprising at least one carbon-bonded hydrogen by electrochemical fluorination, dissociating this separated effluent in a pyrolysis, quenching and separating the effluent to yield tetrafluoroethylene and / or hexafluoropropylene.

A process for manufacturing fluoroolefins comprising perfluorinating a starting material comprising at least one carbon-bonded hydrogen by electrochemical fluorination, dissociating this separated effluent in a pyrolysis, quenching and separating the effluent to yield tetrafluoroethylene and / or hexafluoropropylene.

The invention relates to a method for electrochemically preparing trifluoromethylsulfonyl fluoride from methylsulfonyl chloride, and belongs to the field of fine chemical engineering. The method comprises the following steps: adding methylsulfonyl chloride, a conductive agent and anhydrous hydrogen fluoride into an electrolytic bath to form an electrolyte; subjecting the electrolyte to electrolytic dehydration for 2-10 h under the conditions that the temperature ranges from -10 DEG C to 20 DEG C and the voltage ranges from 3 V to 4.5 V; and under the conditions that the temperature ranges from -10 DEG C to 20 DEG C and the voltage ranges from 5 V to 7.5 V, conducting eletrolysis to obtain electrolysis gas, wherein the electrolysis gas contains trifluoromethylsulfonyl fluoride. According to the method, methylsulfonyl chloride is used as a raw material, a conductive agent and anhydrous hydrogen fluoride are added, an electrochemical fluorination reaction is carried out at a constant voltage, trifluoromethylsulfonyl fluoride can be obtained, wherein the anhydrous hydrogen fluoride is a solvent and a fluorinating agent of the electrolyte. The electrochemical preparation method of trifluoromethylsulfonyl fluoride provided by the invention is simple and convenient to operate, low in cost and suitable for large-scale application.

The invention provides an electrochemical fluorination external circulation electrolysis system. The system comprises an electrolytic cell, an anode cooler, an anode gas-liquid separator, a main cooler, an anode condenser, a cathode cooler, a cathode gas-liquid separator and a cathode condenser. An anode liquid outlet of the electrolytic cell is connected with a liquid inlet of the anode cooler through a pipeline, and a liquid outlet of the anode cooler is connected with a liquid inlet in the upper portion of the anode gas-liquid separator through a pipeline. A liquid outlet in the bottom of the anode gas-liquid separator is connected with a liquid inlet in the top of the main cooler through a pipeline, and a liquid outlet in the bottom of the main cooler is connected with a liquid inlet of the electrolytic cell through a pipeline. The system facilitates miniaturization of the electrolytic cell, can eliminate the risks of refrigerant and electrolyte intermingling and negative and positive gas mixed explosion, obviously enhances the energy efficiency ratio of the electrolytic cell, is safe and reliable, finishes heat management by the coolers, can accurately control the electrolysistemperature, and can sufficiently obtain high-purity product gas through gas-liquid separation.

Method for forming a metallic component surface to achieve lower electrical contact resistance. The method comprises modifying a surface chemical composition and creating a micro-textured surface structure of the metallic component that includes small peaks and / or pits. The small peaks and pits have a round or irregular cross-sectional shape with a diameter between 10 nm and 10 microns, a height / depth between 10 nm and 10 microns, and a distribution density between 0.4 million / cm2 and 5 billion cm2.

Tertiary perfluorocycloamines (TPFCAs) of general formula (1) where n=1 or 2, m=2 or 3, X is wherein at n=2 X is as the basis for gas transport emulsions.TPFCAs comprise a group of compounds which are close in their physicochemical properties to perfluoro-N-(4-methylcyclohexyl)-piperidine, particularly in the critical temperature of dissolution in hexane, and which are used in a mixture, forming a number of compounds with gradually varying characteristics. Owing to this, a greater homogeneity of the fluorocarbon phase is achievable in the emulsions and it becomes possible to enhance the stability of the emulsion particles stabilized by an ethylene oxide-propylene oxide block copolymer, with the absence of toxicity for large animals. A mixture of TPFCAs is prepared by electrochemical fluorination of n-piperidinoheptafluorotoluene in anhydrous hydrogen fluoride. The use of this mixture of TPFCAs instead of individual perfluoro-N-(4-methylcyclohexyl) piperidine simplifies, speeds up the process for preparing perfluorinated organic compounds, makes it cheaper, and provides conditions for broader application of gas transport emulsions based thereon.

The present teachings relate to a methods for drug discovery. In one particular example, the method includes providing a substrate, modifying the substrate by using an electrochemical fluorination, screening a reaction mixture of the electrochemical fIuorination, and identifying a fluorinated compound in the reaction mixture.

The invention relates to a process method for preparing high-purity trifluoromethane sulfonic acid. The process method comprises the following steps: firstly, hydrolyzing trifluoromethane sulfuryl fluoride gas prepared by an electrochemical fluorination method in alkaline metal or alkaline-earth metal hydroxide solution, recrystallizing the generated trifluoromethane sulphonate in a solvent to purify, and then reacting the trifluoromethane sulphonate with 100 percent of sulfuric acid in the presence of silicon dioxide to obtain an initial product of the trifluoromethane sulfonic acid, and finally purifying the trifluoromethane sulfonic acid through reduced pressure distillation. The process method not only effectively improves the hydrolysis speed of the trifluoromethane sulfuryl fluoridegas, leads the trifluoromethane sulfuryl fluoride gas to react more completely, and improves the yield, but also effectively reduces the content of F<-> in the trifluoromethane sulfonic acid product, and improves the purity of the product.

This method for producing a potassium perfluoroalkanesulfonate includes an electrochemical fluorination step in which an alkanesulfonyl halide compound is subjected to electrochemical fluorination in anhydrous hydrogen fluoride, thereby to generate a production gas containing perfluoroalkanesulfonyl fluoride as the main component. In addition, for example, the methods may include a gas absorption step in which the production gas is reacted with an aqueous solution of potassium hydroxide, thereby to generate a gas absorbed solution containing potassium perfluoroalkanesulfonate, a purification step in which impurities such as potassium fluoride, potassium hydroxide, and potassium sulfate, are removed, and a concentration and collection step in which the aqueous solution from which the impurities are removed is concentrated and dried. In the electrochemical fluorination, for example, it is possible that the proton concentration in the reaction solution is maintained in the range of 150 to 1,500 ppm to suppress the formation of byproducts.

The invention discloses an electrochemical fluorination external circulation flexible electrolysis system which comprises a cathode copper bar, an anode copper bar, a cathode cable, an anode cable, anelectrolytic cell, a circulating pump, a cooler I, a gas-liquid separator, a gas condenser and a cooler II. A cell body of the electrolytic cell is internally provided with a left-end electrode cathode plate, a right-end electrode cathode plate and a plurality of electrolysis groups I. The electrolytic cell is formed by connecting n electrolysis groups I in parallel, each electrolysis group I isformed by connecting two electrolysis groups II in parallel, and each electrolysis group II is formed by connecting 2-20 electrolysis cabs in series. According to the invention, the electrolytic cellis highly integrated, the successfully developed bipolar series-parallel combined filter pressing type electrolytic cell is used, and heat generated by electrode reaction is completed through the cooler outside the electrolytic cell, so that the corrosion risk of an electrolyte channel is reduced, and the system risk caused by blockage of a certain cab is solved.

The invention belongs to the technical field of electrochemical fluorination, and particularly relates to a perfluoropolyether electrochemical end capping method, which comprises: carryingout vacuum dehydration degassing treatment on hydrogen-containing functional group-terminated perfluoropolyether used as a raw material, carrying out an electrochemical fluorination reaction with anhydrous hydrogen fluoride in an electrolyte-containing electrolytic cell, and carrying out alkali washing and water washing on the crude product to obtain the perfluorinated perfluoropolyether product. According tothe invention, the method is suitable for electrochemical end capping of perfluoropolyethers with various structures, the process is simple, the used reagents are cheap and easy to obtain, the operation process is safe, the product is easy to purify and high in purity, and the method is suitable for industrial production and application.

The invention provides an electrochemical fluorination external circulation electrolysis system, comprising an electrolytic cell, an anode cooler, an anode gas-liquid separator, a total cooler, an anode condenser, a cathode cooler, a cathode gas-liquid separator and a cathode condenser The anolyte outlet of the electrolytic cell is connected to the liquid inlet of the anode cooler by means of pipes, and the liquid outlet of the anode cooler is connected to the liquid inlet of the upper part of the anode gas-liquid separator by means of pipes; the bottom of the anode gas-liquid separator The liquid outlet of the total cooler is connected with the liquid inlet at the top of the total cooler by means of pipes, and the liquid outlet at the bottom of the total cooler is connected with the liquid inlet of the electrolytic cell by means of pipes. The invention facilitates the miniaturization of the electrolytic cell, can eliminate the risk of inter-connection of refrigerants and electrolytes and the mixed explosion of yin and yang gases, significantly improves the energy efficiency ratio of the electrolytic cell, is safe and reliable, the heat management is completed by the cooler, and the electrolysis temperature can be accurately controlled. Liquid separation can fully obtain high-purity product gas.

The invention belongs to the technical field of electrochemical fluorination, and in particular relates to a perfluoropolyether electrochemical end capping method. Using perfluoropolyether whose end group is hydrogen-containing functional group as raw material, after vacuum dehydration and degassing treatment, electrochemical fluorination reaction is carried out with anhydrous hydrogen fluoride in an electrolytic cell containing electrolyte, and the crude product is washed with alkali and water to obtain Perfluorinated perfluoropolyether products. The invention is suitable for electrochemically capping perfluoropolyethers of various structures, and has the advantages of simple process, cheap and easily available reagents, relatively safe operation process, easy purification and high purity of the product, and is beneficial to industrial production and application.

The invention provides a preparation method of heptafluorobutyric acid, comprising the following steps: A) performing electrochemical fluorination reaction with n-butyric acid, n-butyryl chloride or n-butyryl fluoride and anhydrous hydrogen fluoride to obtain electrolytic mixed gas; The current density of electrochemical fluorination reaction is 0.025~0.033A / cm 2 , the reaction temperature is 9 to 13°C; the electrochemical fluorination reaction is provided with a cooling reflux device, and the cooling medium temperature of the cooling reflux device is -45°C; B) the electrolytic mixed gas prepared in step A) is passed into A reaction kettle equipped with an acid-binding agent to obtain heptafluorobutyryl fluoride, the acid-binding agent being triethylamine; C) mixing the heptafluorobutyryl fluoride obtained in step B) with water, and hydrolyzing to generate an aqueous solution of heptafluorobutyric acid D) mixing the above-mentioned heptafluorobutyric acid aqueous solution with KOH until the KOH concentration is 40% to 45%, and naturally crystallizing to obtain potassium heptafluorobutyrate; E) acidifying the above-mentioned potassium heptafluorobutyrate with sulfuric acid to obtain heptafluorobutyrate acid.

The invention discloses an electrochemical fluorination electrolytic cell, which comprises a cell body (1), a cell cover (2), a temperature control jacket (3) on the side wall of the cell body, a bottom discharge valve (4), and an electrode group (5 ), the anode conductive rod (6), the cathode conductive rod (7), the conductive beam (8), the structure of the electrode group is: the electrode plate is fixed by the fixed shaft (15) passing through the pole plate center hole (19) , the distance between the electrode plates is controlled by an annular insulating pad (17), and the fixed shaft fixes the electrode plates into a group of electrode groups through the insulating nuts (16) at both ends; the conductive beam has a hollow structure, and the electrodes on the electrode plates The screw rod (20) passes through the hollow structure and is fixed on the conductive beam, and the conductive beam is assembled with the tank cover (2) through the negative and anode conductive rods. The electrolytic cell has the characteristics of large capacity, high space utilization rate, and large effective electrolysis area. The electrode plate is movably connected with the conductive beam, which is easy to disassemble and assemble.

Described is a process for the electrochemical fluorination of a substrate, the process comprising the steps of: providing a substrate comprising at least one carbon-bonded hydrogen; preparing a reaction solution comprising the substrate and hydrogen fluoride; passing electric current through the reaction solution sufficient to cause replacement of one or more hydrogens of the substrate with fluorine, the electric current being interrupted through a current cycle defined by current levels comprising an elevated current and a reduced current; wherein the current varies in such a manner that the resistance of the cell operated with interrupted current is lower than the resistance of the cell operated with uninterrupted current.