43 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.

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.

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 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.