1340 results about "Electrolytic process" patented technology

Alkali metals and sulfur may be recovered from alkali polysulfides in an electrolytic process that utilizes an electrolytic cell having an alkali ion conductive membrane. An anolyte solution includes an alkali polysulfide and a solvent that dissolves elemental sulfur. A catholyte solution includes alkali metal ions and a catholyte solvent. Applying an electric current oxidizes sulfur in the anolyte compartment, causes alkali metal ions to pass through the alkali ion conductive membrane to the catholyte compartment, and reduces the alkali metal ions in the catholyte compartment. Sulfur is recovered by removing and cooling a portion of the anolyte solution to precipitate solid phase sulfur. Operating the cell at low temperature causes elemental alkali metal to plate onto the cathode. The cathode may be removed to recover the alkali metal in batch mode or configured as a flexible band to continuously loop outside the catholyte compartment to remove the alkali metal.

Disclosed are processes of making solutions of alkali alkoxides in their corresponding alcohols using an electrolytic process. In one embodiment, sodium methoxide in methanol is made from methanol and aqueous sodium hydroxide solution, where the aqueous sodium hydroxide solution is present in the anolyte compartment and a solution of sodium methoxide in methanol is present in the catholyte compartment, the two compartments are separated by a ceramic membrane that selectively transports sodium ions under the influence of an electric potential, and wherein the composition of the solution of sodium methoxide in methanol in the catholyte compartment of the electrolytic cell comprises between at least about 2% by weight sodium methoxide and at most about 20% by weight sodium methoxide.

A process of preparing purified Ti by the way of electrolysis directly from sosoloid positive pole, TiO?mTiC. Mix the powder of C and TiO2 or TiC as measurement of chemical reaction. Then press to be certain size to make positive pole, TiO?mTiC in airvoid at 600-1600íµ. Electrolyte is halide fused salt of alkali. Electrolysis at 400-1000íµ. C and O in the positive pole form CO, CO2 and O2. Purified Ti is obtained from negative pole.

A process for converting in a single pass an aqueous alkaline pH, alkali metal chlorite solution into an aqueous chlorine dioxide-containing solution that involves the combination of (1) using an electrochemical acidification cell to lower the pH value of the aqueous alkali metal chlorite feed before it enters the anode compartment of an electrochemical oxidation cell where the chlorite is converted to chlorine dioxide with (2) using an anolyte flow pattern where the anolyte passes through a porous, high surface area electrode. This process results in a substantially improved conversion efficiency per pass.

An apparatus for the electrolytic splitting of water into hydrogen and/or oxygen, the apparatus comprising: (i) at least one lithographically-patternable substrate having a surface; (ii) a plurality of microscaled catalytic electrodes embedded in said surface; (iii) at least one counter electrode in proximity to but not on said surface; (iv) means for collecting evolved hydrogen and/or oxygen gas; (v) electrical powering means for applying a voltage across said plurality of microscaled catalytic electrodes and said at least one counter electrode; and (vi) a container for holding an aqueous electrolyte and housing said plurality of microscaled catalytic electrodes and said at least one counter electrode. Electrolytic processes using the above electrolytic apparatus or functional mimics thereof are also described.

A composite, high-temperature resistant, non-carbon metal-based anode of a cell for the electrowinning of aluminium comprises a metal-based core structure of low electrical resistance, for connecting the anode to a positive current supply, coated with a series of superimposed, adherent, electrically conductive layers. These layers consist of at least one layer on the core structure constituting a barrier substantially impervious to monoatomic oxygen and molecular oxygen; one or more intermediate, protective layers on the oxygen barrier layer which remain inactive in the reactions for the evolution of oxygen gas; and an electrochemically active layer for the oxidation reaction of oxygen ions present at the anode/electrolyte interface into nascent monoatomic oxygen, as well as for subsequent reaction for the formation of gaseous biatomic oxygen. The active layer on the outermost intermediate layer is slowly consumable during electrolysis and protects the intermediate protective layer by inhibiting its dissolution into the electrolyte.

A process for the recovery of zinc metal from a zinc mineral includes the steps of leaching the zinc mineral in a solution including a halide species formed from two or more different halides, to leach the zinc into the solution. The zinc-bearing solution is then electrolysed to yield zinc metal and to generate the halide species. The electrolysed solution including the halide species is then returned to the leaching step. A portion of the electrolysed solution can be removed as a bleed stream from a cathode compartment of an electrolytic cell of the electrolysis process and processed to remove manganese as manganese dioxide precipitate by adding thereto limestone, and the halide species from an anode compartment of the electrolysis process. In this regard, the pH and Eh of the solution can regulated in a manner that favours the formation of the manganese dioxide precipitate over the formation of a precipitate of zinc.

The present invention relates to an electrolytic process, methods and apparatus for the preparation of carbon monoxide and in particular to electrolysis of molten carbonates to yield carbon monoxide which may be used for chemical storage of electrical energy and further as chemical feedstock for other organic products.

The present invention provides for a mold that can position and hold abrasive particles, which are to be electrolytically attached to an electrically conductive substrate during an electrolytic process. The mold can include an insulating material with a molding surface suitable for holding the abrasive particles in place during this process. Additionally, a method for making an abrasive tool using such a mold is provided, as well as abrasive tools made thereby. In one aspect of this invention, abrasive tools can have abrasive particle tips that are arranged in accordance with a predetermined vertical pattern and/or a predetermined horizontal pattern in a manner that requires little or no post electrodeposition processing.

An object of the present invention is to provide an electrode for electrolysis which is available by an easy fabrication process, can produce ozone water at high efficiency and also can produce hydrogen peroxide and OH radicals having a high oxidizing power by the electrolysis of water at a low current density; an electrolytic process using the electrode; and an electrolytic apparatus using them. The electrode for electrolysis according to the present invention has a substrate and a surface layer formed on the surface thereof, the surface layer being made of anatase type titanium oxide.

A carbon nanotube paper is prepared from carbon nanotubes through adding them to acid, heating or thermal reflux, and/or ultrasonic stirring, removing impurity, diluting in water, filtering, washing the filtered cake, dispersing the carbon nanotubes in water by ultrasonic stirring, spreading on carrier, and drying. It has regular structure, high uniformity, purity and electric conductivity, and enough mechanical strength.

A method and apparatus for generating electrolyzed water easy to carry out or handle even in ordinary homes. An electrolyte aqueous solution is circuited through a first electrolysis chamber 3a of two electrolysis chambers placed on opposite sides of an ion-permeable membrane 2, and raw water is supplied only to the second electrolysis chamber 3b. A voltage is applied between electrodes 7a and 7b to cause electrolysis. Electrolyzed water generated in the second electrolysis chamber 3b is drawn out. The concentration of the electrolyte aqueous solution circulated through the first electrolysis chamber 3a is maintained within a predetermined range. The membrane 2 is an anion-exchange membrane. The electrolyte aqueous solution is circulated through the first cathode-side electrolysis chamber 3a; raw water is supplied only to the second anode-side electrolysis chamber 3b; and acid electrolyzed water generated in the anode-side electrolysis chamber 3a is drawn out. The electrolyte aqueous solution is NaCl or KCl aqueous solution. The concentration is maintained within the predetermined range by adding hydrochloric acid according to the pH of the NaCl or KCl solution or the amount of reaction of this solution computed from the amount of energization during the electrolysis.

The present invention discloses an aluminum electrolytic MES system based on an accurate perception and an intelligent decision. The system comprises an electrolytic tank online detection device (1) for detecting aluminum electrolytic real-time production data, an online detection data collection device (10) for collecting real-time production data, an intelligent mobile terminal (2) for obtaining the position information of an operator, a plant wireless or wired network (3), a production billboard (4) for information display, an information integration platform (5), a production management system (6) based on production process real-time data, an aluminum electrolytic process energy management system (7), an expert operation system (8) based on electrolytic tank (11) real-time production data, and an intelligent controller (9) for production control. According to the system, the degree of precision and the automation level of the aluminum electrolytic production management and control can be improved, the management efficiency is improved, and the influence on aluminum electrolytic production brought by personnel technology and management level differences can be reduced.

The invention discloses a method for preparing electronic-grade tetramethylammonium hydroxide (TMAH), belonging to the field of electrochemistry. In the method, tetramethylammonium bicarbonate is used as a raw material for electrolysis, a dual-film electrolyzer is used for preparing the electronic-grade TMAH, and the whole electrolyzer implements cyclic stirring of the electrolyte in the electrolytic process in an external cycle mode. The electrolytic conditions are as follows: the cathode tank uses a 0.2-0.5 mol/L TMAH solution; the buffer tank uses a 1.0-3.0 mol/L TMAHCO3 solution; the anode tank uses a 0.2-0.6 mol/L Na2SO4 solution; the temperature for electrolysis is 40-60 DEG C; and the current density is 400-1000 A/m<2>. The invention has the advantages of simple technological process, low raw material cost, high product yield (the content of metallic ions in the product is lower than 4ppm, achieving the standard for electronic-grade TMAH), high electrolytic-current efficiency (up to 80-90%), environmental protection, no pollution and high production safety.

The present invention discloses one kind of low roughness and high performance electrolytic copper foil with surface crystal grains in equiaxial pyramid form, surface roughness not greater than 2.5 micron, thickness of 18 micron, peel strength not lower than 0.45 kg/cm, tensile strength not lower than 330 MPa and elongation not lower than 6 %. The present invention discloses also the preparation process of the electrolytic copper foil, and prepares electrolytic copper foil through a DC electrodeposit process with electrolyte with proper composition and added mixed organic additive and reasonable electrodeposit technological parameters. The electrolytic copper foil has low roughness and stable and high performance, and may be used in preparing fine circuit.

The invention relates to an alloy material suitable for an inert anode of a metal fused-salt electrolysis cell, relating to metal fused-salt electrolysis, in particular to a carbon-free metal-base alloy inert anode of an aluminium electrolysis cell. The carbon-free metal-base alloy inert anode of the aluminium electrolysis cell is characterized in that the alloy material comprises the following components in percentage by weight: 5-30% of Ni, 5-20% of Al, and the balance of Cu. The alloy material suitable for the inert anode of the metal fused-salt electrolysis cell is suitable for a lower-temperature (700 DEG C-850 DEG C) electrolyte system; in addition, the alloy inert anode has good high-temperature oxidation resistance and electrolyte corrosion resistance in the electrolytic processes, and electrolyzed aluminium products reach the quality more than 99.7 percent.

A method of applying electrolytic process to extract out superfine impurities in steel includes preparing organic electrolyte by 2wt% of tetramethylsalmiac, 8wt% of diacetone, 5wt% of glycerin, 6wt% of trolamine, allowance of pure methanol and 5g/L of DPG as per valum/weight; polishing and washing steel sample then placing steel sample in electrolytic tank; using steel sample as anode; leading inter-gas of argon in and regulating electrolytic potential, holding steel sample in said tank for 20-40hours then using vacuum filtering device to separate out superfine impurities in steel sample under vacuum condition.

Provided is a dynamic evolution modeling method for aluminum electrolysis process electrolytic bath technology energy consumption. The method is characterized by including the following steps of step 1, collecting data [XN, Y], step 2, carrying out normalization processing on the collected data, step 3, carrying out modeling on the data after the normalization processing by strongly tracking a square root trackless Kalman neural network, and step 4, estimating an electrolysis process energy consumption value by applying an established model to obtain a technology energy consumption value of the electrolysis process at the moment. The method has the advantages that advantages of strong tracking filtering and square root filtering are combined, convergence rates of the model and tracking ability on electrolytic bath mutation states are improved, the algorithm is stable, accuracy is high, tracking ability on the electrolytic bath mutation states is strong, therefore, real time estimation on the aluminum electrolysis process electrolytic bath technology energy consumption is achieved, technology operations on the aluminum electrolysis process can be optimized, and the purposes of saving energy and reducing emission can be achieved.