80 results about "Perfluorinated carboxylic acid" patented technology

The invention relates to the technical field of ionic membranes, and particularly relates to an ionic conductive membrane for a chlorine-alkali industry and a preparation method thereof. The ionic conductive membrane comprises a perfluorinated ion exchange resin base membrane, a micro-porous reinforcing material and a surface layer of a perfluorinated ion exchange resin microparticle. The perfluorinated ion exchange resin microparticle is a mixture of one or two of a perfluorinated carboxylic acid resin microparticle or perfluorinated sulfonic acid-carboxylic acid copolymer resin microparticle and a perfluorinated sulfonic acid resin microparticle, wherein the perfluorinated sulfonic acid resin microparticle accounts for 95%-50% of the percentage by mass of the mixture. The surface layer of the ionic conductive membrane has good compatibility and adhesion and maintains a good degassing effect in the whole service life of the ionic conductive membrane. An alkali metal chloride solution of which the range of concentration is wide can be efficiently and stably treated by the ionic conductive membrane in the chlorine-alkali industry, and the ionic conductive membrane is applicable for running in a zero-pole electrolytic cell under a novel high current density condition and a very excellent product purity index is achieved. The invention also provides a preparation method of the ionic conductive membrane, the process is simple and reasonable and industrial production is easily achieved.

The present invention relates to a process for producing fluorinated aliphatic compounds by pyrolysis of perfluorocarboxylic acids and their derivatives-halides and esters. The pyrolysis is carried out in the presence of a catalyst consisting of a carrier most preferably selected from the series comprising active carbon, magnesium oxide, calcium oxide, barium oxide, zinc oxide, aluminum oxide, nickel oxide, oxides of silicon promoted with alkali metal halides, selected from the series comprising fluorides, chlorides bromides, iodides of sodium, potassium, rubidium, cesium, at a temperature in the range of from about 100° C. to about 450° C.; with producing fluorinated aliphatic compounds selected from the series comprising perfluoroolefins, polyfluoroolefins and their derivatives; and also in the presence additionally of hydrogen fluoride with the formation of fluorinated aliphatic compounds selected from the series comprising polyfluoroalkanes and their derivatives.

The invention discloses a treatment method of perfluoroalkyl acyl fluoride waste. The method comprises the following steps of: first, adding aqueous alkali to the perfluoroalkyl acyl fluoride waste, adjusting the pH value to 7-8, standing and separating to obtain a water phase and an oil phase; then, separating and purifying the water phase to obtain perfluorocarboxylate; and finally, separating and purifying the oil phase to obtain inertial fluorocarbon. The perfluoroalkyl acyl fluoride waste is treated in grades in the following steps of: adding aqueous alkali to separate the perfluoroalkyl acyl fluoride waste into the water and oil phases, and respectively separating and purifying the water and oil phases; and obtaining high purity perfluorocarboxylate after separation and purification of the water phase and obtaining high purity inertial fluorocarbon after separation and purification of the oil phase. The treatment condition is mild and the treatment effect is good.

The invention relates to an ion exchange film operated under an ultrahigh current density condition and a preparation method of the ion exchange film. The film is a three-structure composite film which consists of a perfluorinated sulfonic acid resin film with high exchange capacity, a perfluorinated hot melting adhesive high-elastic film with the low molecular amount and the thickness of 1-30 microns and a perfluorinated carboxylic acid resin film with low exchange capacity. By the composite film, an enhanced ion exchange film is formed by using a fiber mesh or a microporous film. The invention also provides a method for preparing the ion exchange film, solves the problem of stripping and deformation caused by large ion flux difference between the sulfoacid film with the high exchange capacity and the carboxylic acid film with the low exchange capacity under a high current density condition, and has high electrolysis performance under a condition that the operation speed is up to 6-20KA / m<2>.

The invention belongs to the technical field of polymer materials and specifically relates to an ion exchange membrane for electrolysis of an oxygen cathode and a preparation method thereof. The ion exchange membrane for electrolysis of the oxygen cathode is a multi-layer composite membrane comprising a perfluorosulfonic acid ion exchange resin layer, a perfluorocarboxylic acid ion exchange resin layer, a reinforcing mesh fabric, a hydrophilic coating and a multifunctional coating, wherein the thickness of the perfluorosulfonic acid resin layer is 80-150 mu m, the thickness of the perfluorocarboxylic acid resin layer is 8-15 mu m, the hydrophilic coating with the thickness of 3-12 mu m is coated on the surface on the anode side of the membrane, and the multifunctional coating with the thickness of 3-12 mu m is coated on the surface on the cathode side of the membrane. The preparation method comprises the following steps: spraying the carboxylic acid side of the ion membrane after transformation by using a dispersion solution containing perfluorosulfonic acid resin, a catalyst and a lower alcohol and drying to form the multifunctional coating. According to the preparation method provided by the invention, the surface of the ion membrane is endowed with a catalytic structure and the function, oxygen is in full contact with the surface of the ion membrane, and reaction is performed on the surface, so that the cell voltage is reduced and the catalytic efficiency is simultaneously improved.

A RE metal contained perfluorocarboxylic acid-Lewis acid catalyst suitable for FBC technique and the catalyzing in organic phase is prepared through the reaction between RE metal oxide, acetate, carboxyl compound, halide sulfate or nitrate and perfluorocarboxylic acid. Its advantages are high stability in air, high catalytic activity and easy recovery.