49results about "Hydrogen chloride preparation" patented technology

The invention provides a caustic soda production control method, device and equipment and a storage medium, and the method comprises the following steps: when first production data meets a preset production starting condition, preparing saline water; when the concentration of the saline water reaches a preset concentration, carrying out load-increasing linkage control on an electrolytic bath, a chlorine compressor and a hydrogen compressor; the electrolytic bath is used for electrolyzing the saline water to obtain sodium hydroxide, hydrogen and chlorine, the chlorine compressor is used for liquefying the chlorine, and the hydrogen compressor is used for treating the hydrogen; when the purity of the hydrogen and the purity of the chlorine reach the preset purity, the hydrogen and the chlorine are used for hydrochloric acid synthesis. According to the method, caustic soda production is automatically carried out according to production data, linkage control is carried out on all parts in the production process, and automatic starting and stopping and load changing of caustic soda industrial production are achieved.

The invention relates to a hydrogen chloride synthesis process control method, device and system, an upper computer and a medium. The method comprises the following steps: acquiring to-be-predicted data, wherein the to-be-predicted data comprises a three-channel pixel average value of a hydrogen chloride flame picture at a plurality of to-be-predicted moments in a time period; inputting to-be-predicted data into the hydrogen chloride concentration prediction model to obtain predicted hydrogen chloride concentration; inputting to-be-predicted data into the chlorine-hydrogen state prediction model to obtain a predicted chlorine-hydrogen state; determining that the predicted chlorine-hydrogen state is abnormal continuously for multiple times, and determining the ratio of chlorine to hydrogen according to the predicted hydrogen chloride concentration; and adjusting the flow of chlorine or hydrogen based on the ratio of chlorine to hydrogen so as to be within a preset range. By adopting the method, the hydrogen chloride concentration and the chlorine-hydrogen state can be predicted based on the flame color, the chlorine-hydrogen ratio can be automatically calculated according to the predicted hydrogen chloride concentration, and the flow of chlorine or hydrogen can be adjusted through feedback.

The invention provides a process for directly reducing iron and separating iron and aluminum from aluminum oxide red mud, and relates to the technical field of comprehensive utilization of metallurgical solid waste such as red mud and carbon dioxide CCUS. According to the process for directly reducing iron and separating iron from aluminum by using aluminum oxide red mud, solid wastes such as red mud, secondary aluminum ash or other sodium-based additives, metallurgical slag and the like are used as raw materials, and are mixed and granulated after being reasonably matched with a catalyst. Roasting in a gas semi-suspension oxidation kiln; and the roasted material enters a self-gravity closed electric heating reduction kiln to be calcined by taking biomass as fuel. CO gas generated by calcination is used as fuel of the fuel gas semi-suspension oxidation kiln. After calcination, under the protection of excessive CO gas, the high metallization ratio of 95% or above is achieved, iron and aluminum are separated, the material cooled to about 200 DEG C is leached with water, the levigated material enters a magnetic separator, solid-liquid separation and solid-phase magnetic separation of metal iron are achieved, and titanium concentrate and slag are separated.

The invention provides a multi-effect integrated potassium hydroxide ionic membrane process production system, relates to the technical field of potassium hydroxide industrial production, and realizes efficient and green production through synergistic operation of salt refining, electrolysis, gas treatment, resource recovery and other units. The method comprises the following steps: dissolving a raw material potassium chloride in a salt dissolving tank, sequentially adding KOH, FeCl3 and K2CO3 into a baffling tank, carrying out chemical refining, removing organic matters and calcium and magnesium ions, carrying out three-stage cross-flow filtration by a membrane filter and carrying out advanced treatment by an ion exchange resin tower to prepare high-purity primary brine, and carrying out an electrolysis process. Chlorine generated by an anode of the electrolytic tank is subjected to multi-stage washing, cooling and drying, then is pressurized and sent to an acid making unit, and light salt brine generated by electrolysis is subjected to chlorate decomposition and vacuum dechlorination processes, so that efficient removal of free chlorine and recovery of chlorine are realized. The system ensures the production stability and safety through gradient utilization of heat energy, closed-loop circulation of water resources and automatic control, and has economic and environment-friendly benefits.

The present invention relates to a process for the recovery of waste materials by producing soda ash, sodium hydroxide and hydrogen via converting the liquid and solid wastes, which are generated as a result of production from the Trona ore using solution mining and underground production methods, into a solution; and a process that will enable production in brine production areas that are currently not suitable for production.

The embodiment of the invention discloses a chlorine-alkali industry multi-mode hydrogen production and hydrogen chloride synthesis system and method.The chlorine-alkali industry multi-mode hydrogen production and hydrogen chloride synthesis system comprises a grid power supply module, a distributed photovoltaic module, a PEM hydrogen production module and a hydrogen chloride synthesis module; the PEM hydrogen production module comprises a PEM electrolytic bath, a cooling device and a heating device; the grid power supply module and the distributed photovoltaic module are connected with the power supply end of the PEM electrolytic cell; the rear end of the PEM electrolytic bath is connected with the first input end of the cooling device; the first output end of the cooling device is connected with the first input end of the heating device, and the first output end of the heating device is connected with the front end of the PEM electrolytic bath; the second input end of the heating device is connected with the distributed photovoltaic module, and the second output end of the heating device outputs hot water; the technical effects of adjusting the working temperature of the PEM electrolytic bath and repeatedly utilizing the high-temperature circulating pure water are achieved, and the energy utilization efficiency is improved.

This invention provides a production process for manufacturing metallic magnesium and industrial silicon by decomposing serpentine using the hydrochloric acid method. [Solution] The present invention provides a method for processing serpentine ore as a raw material using a two-stage countercurrent hydrochloric acid leaching process. The wet process steps include storage and filtration of the slurry after ore dressing, two-stage hydrochloric acid leaching under atmospheric pressure, washing and filtration of the silicon slag after leaching, removal of iron and nickel precipitation from the leaching solution, separation, washing and filtration of the obtained iron hydroxide and nickel hydroxide, crystallization and evaporation of the magnesium chloride solution, and production of hydrochloric acid using the gas generated after the thermal decomposition of magnesium chloride. The present invention has developed a serpentine decomposition technology using hydrochloric acid, a metallic magnesium production process using a drying-electrolytic method, and a process for producing industrial silicon by smelting silicon slag in an electric furnace.

A hydrogen chloride loop fuel reaction is designed and configured for turbine / generator combination which can be used for automotive propulsion or as a standalone electrical generation or for auxiliary equipment. A method for providing a hydrogen chloride loop fuel reaction includes creating hydrogen chloride fuel in a sealed furnace vessel, wherein at start up, the sealed furnace vessel is vacuumed out and hydrogen and chlorine are injected into a burner and ignited resulting in the hydrogen chloride fuel in an exhaust stream of the sealed furnace vessel; and looping the hydrogen chloride fuel leaving the sealed furnace vessel in the exhaust stream of the sealed furnace vessel.

An integrated energy system comprising a power plant including at least one nuclear reactor and an electrical power generation system, the at least one nuclear reactor being configured to generate steam, and a supercritical water oxidation system operably coupled to the power plant. The supercritical water oxidation system including a desalination plant configured to produce first water and brine, a chlor-alkali membrane process configured to receive the brine and produce at least a Sodium Hydroxide solution, a reactor configured to receive the first water, the steam, and the Sodium Hydroxide solution to produce a waste solution and a solid waste, and a separator configured to receive the waste solution and produce Carbon Dioxide and second water.

The invention discloses a chloride solution electrolysis recycling method in a metal smelting separation process, which is characterized in that a metal chloride solution and a sodium chloride solution which are obtained in the metal smelting separation process, and a sodium hydroxide solution and hydrochloric acid which are prepared by an electrolysis method are recycled in the metal smelting separation process. CO2 generated in the roasting process is recycled to be circularly used in the metal carbonization precipitation process, material recycling in the smelting separation process is achieved, the technology is good in applicability, and the common problems that in the industry at present, waste water tail end treatment is high in energy consumption and cost, and materials are difficult to recycle are solved.

The application discloses a preparation method of a carbon-coated catalyst, and a method for removing free chlorine in hydrochloric acid. The catalyst is prepared by taking sugar as a carbon source, adding an active metal core, and then performing a hydrothermal reaction, filtration and high-temperature calcination. The carbon-coated catalyst is mixed with ion exchange resin in a certain proportion, and then free chlorine in hydrochloric acid can be removed. The application can effectively decompose free chlorine in hydrochloric acid, remove metal ions in the hydrochloric acid, and greatly improve the quality of the hydrochloric acid.

The invention discloses a method for preparing rare earth hydroxide from alkali metal hydroxide and recycling the rare earth hydroxide, which comprises the following steps: (1) mixing an alkali metal hydroxide solution and a rare earth chloride salt solution and reacting, after the reaction is finished, carrying out solid-liquid separation to obtain a precipitate and a mother solution, and washing the precipitate to obtain the rare earth hydroxide and a washing solution; (2) carrying out impurity removal and concentration on the mother liquor, and then electrolyzing to obtain an alkali metal hydroxide solution, Cl2 and H2; returning the obtained alkali metal hydroxide solution to the step (1), and recycling the alkali metal hydroxide solution as a precipitant; and (3) the Cl2 and H2 in the step (2) react to obtain hydrochloric acid, the hydrochloric acid is used for reverse extraction of the loaded organic phase to obtain a rare earth chloride salt solution, and the step (1) is returned. According to the method, the rare earth hydroxide can be obtained, and comprehensive recycling of the alkaline precipitant, the wastewater and the regenerated acid is realized.

The present invention provides a method (100a) and system for controlling the operation of a chemical plant arranged to carry out a chemical process which produces iron and / or manganese in elemental form from respective oxides thereof using liquid sodium as a reductant of the respective oxides and which can also produce an oxide or hydroxide of at least one of calcium, magnesium and iron from a carbonate mineral of at least one of calcium, magnesium and iron. The method (100a) comprises assigning (103a) a respective value to the no. of mol of each one of the chemical species involved in the chemical process as starting materials and products thereof, subject to constraints which are derived from the law of conservation of mass of the constituent elements of those chemical species. The method also assigns (103b) respective values to the nos. of mol of chemical species which are consumed during the chemical process by electrolytic or thermochemical decomposition into their constituent elements, subject to another set of constraints which are derived from the minimum requirements for these constituent elements by the chemical process itself. The former set of constrains allows the materials balance of the process to be controlled and the latter set of constraints allows the energy balance of the process to be controlled. The method then comprises operating (104) the chemical plant to carry out the process according to the values thus assigned. Respective values may be assigned (103a, 103b) to the nos. of mol of a preferred subset of the chemical species involved in the process as starting materials and products thereof and / or a preferred subset of the chemical species which are consumed during the process by electrolytic or thermochemical decomposition into their constituent elements, before values are then assigned to remaining ones of the nos. of mol of other chemical species not in the preferred subset. This allows the chemical plant to be operated in such a way as to optimise its performance relative to such variables as the respective nett amounts of a preferred one or more of the materials it consumes and / or produces, the energy efficiency of a part or the whole of the chemical process and / or its cost effectiveness, for example. Amongst other things, the constraints also ensure that the chemical process always produces less carbon dioxide than instead calcining a carbonate mineral of at least one of calcium, magnesium and iron to produce its corresponding oxide, and that in a large number of cases, it can produce no carbon dioxide at all. Also disclosed is a graphical technique which may be used to assign the respective values to the nos. of mol of the chemical species involved in the chemical process subject to the stated constraints, whereby the method and system of the invention may be implemented.

Processes for treating spent caustic in a hydrocarbon process utilizing HCl are described. The processes include sending the spent caustic to a caustic scrubbing system. HCl rich off gases are routed to the scrubbing system. This process is designed to deplete the NaOH in the spent caustic and form a brine solution. The brine is sent to an electrochemical cell to convert the NaCl to NaOH while generating chlorine and hydrogen gas. The NaOH generated from the electrochemical reaction is recycled back to the caustic scrubber, while the chlorine and hydrogen gas are combined and recycled back to the reaction zone.

The invention provides a method and system for removing zinc and extracting zinc from chlor-alkali coupled galvanized waste, and the method for removing zinc and extracting zinc from chlor-alkali coupled galvanized waste comprises the following steps: driving chlor-alkali equipment with green electricity, electrolyzing a sodium chloride solution to prepare hydrogen, chlorine and a sodium hydroxide solution, and synthesizing hydrochloric acid from the hydrogen and chlorine from the chlor-alkali equipment under a heating condition; pickling and soaking the zinc plating waste by using the synthesized hydrochloric acid to obtain a chloride solution and hydrogen; performing multiple-effect evaporation on the chloride solution to obtain a concentrated solution and diluted hydrochloric acid, and reusing the diluted hydrochloric acid for pickling and soaking; performing fractional precipitation on the concentrated solution by using a sodium hydroxide solution from chlor-alkali equipment, and separating zinc hydroxide precipitate and waste liquid; performing heat treatment on the separated zinc hydroxide precipitate to obtain zinc oxide; hydrogen generated by pickling and soaking is used for reducing zinc oxide hydrogen, and zinc metal with the purity larger than 99% is obtained; sodium chloride and sodium hydroxide in the waste liquid obtained through fractional precipitation are recycled, sodium chloride is recycled to chlor-alkali equipment, and sodium hydroxide is recycled to fractional precipitation.

The present application relates to the technical fields of chemical synthesis, in particular, to a four-in-one graphite synthesis furnace for uniform heat exchange. It comprises a protective furnace cylinder, a combustion assembly is arranged at the bottom end of the inner side of the protective furnace cylinder, a graphite pipe is arranged between the protective furnace cylinder and the combustion assembly, and an absorption treatment assembly is arranged above the protective furnace cylinder. The present application can form a first heat recovery from bottom to top for the graphite pipe, and the heat exchange graphite block connected with the graphite pipe will form uniform heat exchange through the circulating heat exchange pipe and the surrounding heat exchange pipe, and a second heat recovery through the heat exchange cooling assembly. The present application can form a structure for uniform heat exchange and a heat recovery mechanism on the graphite pipe and the heat exchange graphite block, complete the uniform exchange and recovery of the heat generated in the process of burning hydrogen chloride by burning chlorine and hydrogen, and prevent the problem of uneven heat distribution of the protective furnace cylinder, which causes the difference in the wear degree of the cylinder wall of the protective furnace cylinder and affects the service life of the cylinder wall.

The invention belongs to the technical field of chemical engineering, and particularly relates to a hydrogen chloride synthesizer with byproduct high-pressure steam, the hydrogen chloride synthesizer comprises a pipe body and a burner, the burner is arranged on the lower side of the pipe body and communicated with a fuel container, the pipe body comprises a reaction pipe and a cooling pipe which are distributed from bottom to top and connected through a flange plate, and the reaction pipe is communicated with the cooling pipe. An adjusting mechanism is arranged in the cooling pipe, through the arrangement of the adjusting mechanism, when hydrogen chloride is synthesized and processed, the position state of the spiral barrier plate in the annular channel can be adjusted, so that the state of hydrogen chloride gas in the cooling pipe can be subjected to cooling processing treatment in a targeted manner, and meanwhile, through different media in the adjacent annular channels, the cooling efficiency is improved. The purpose of further improving the heat exchange efficiency and effect can be achieved.

The invention relates to a serpentine comprehensive utilization technology, in particular to a production process for preparing magnesium metal and industrial silicon by decomposing serpentine through a hydrochloric acid method. Serpentine ore is used as a raw material, and a hydrochloric acid system two-stage countercurrent leaching process is adopted for treatment. The wet process comprises the following steps: storage and filtration of slurry after mineral separation and wet grinding, two-stage normal-pressure hydrochloric acid leaching, washing and filtration of leached silicon slag, iron removal and nickel precipitation of leachate, separation, washing and filtration of ferric hydroxide and nickel hydroxide obtained by precipitation, crystallization and evaporation of a magnesium chloride solution, and preparation of hydrochloric acid from flue gas after thermal decomposition of magnesium chloride. The invention develops a process for decomposing serpentine by a hydrochloric acid method and producing magnesium metal by a drying-electrolysis method, and a process for producing industrial silicon by smelting silicon slag in an electric furnace. The produced magnesium metal product meets the requirements of related chemical components of the national standard, and the quality of the industrial silicon product meets the chemical silicon standard. The method has the characteristics of short flow, small environmental pollution, low energy consumption, lower cost and the like.

Methods and systems for production of lithium hydroxide and lithium carbonate are described. One or more embodiments of the method include producing lithium hydroxide from potassium chloride, lithium chloride, and water. One or more embodiments of the method include producing lithium carbonate from potassium chloride, lithium chloride, water, and a carbon dioxide source. One or more embodiments of the method include producing lithium carbonate from sodium chloride, lithium chloride, water, and a carbon dioxide source.

A method for preparing metallic magnesium and industrial silicon by decomposing serpentine with hydrochloric acid is provided. Serpentine is used as a raw material, and is processed by a two-stage countercurrent leaching process in a hydrochloric acid system. A hydrometallurgical process is adopted, including beneficiation, wet grinding, slurry storage, filtration, two-stage atmospheric pressure hydrochloric acid leaching, washing and filtration of leached silica slag, iron removal and nickel precipitation from a leachate, separation, washing and filtration of a ferric hydroxide precipitate and a nickel hydroxide precipitate, crystallization and evaporation of a magnesium chloride solution, and hydrochloric acid preparation from a flue gas generated after thermal decomposition of magnesium chloride. The present disclosure develops a process of decomposing serpentine with hydrochloric acid and producing metallic magnesium by a drying-electrolysis method, and a process of producing industrial silicon by smelting silica slag in an electric furnace.

The invention relates to a process for the synthesis of anhydrous hydrogen chloride, a hy-drogen chloride synthesis furnace and anhydrous hydrogen chloride.

The present invention relates to the technical field of hydrogen chloride synthesis, and specifically discloses a hydrogen chloride synthesis system with a high by-product of 1.0 MpaG steam, comprising a synthesis furnace, and a high-pressure steam output unit, a low-pressure steam output unit, and a waste steam treatment unit respectively connected to the synthesis furnace, wherein the waste steam treatment unit is connected to the low-pressure steam output unit; the synthesis furnace is provided with a synthesis section, a steam circulation section, and a cooling section from bottom to top, and all three sections are composed of a graphite cylinder and a steel shell sleeved outside the cylinder, and the steam circulation section is provided with a high-pressure vapor-liquid outlet and a hot water reflux inlet. In the synthesis system of the present invention, the waste steam of the off-site low-pressure steam collection system is pumped into a hot water circulation tank by a low-pressure steam water pump, and is recycled by the hot water circulation tank, thereby increasing the production capacity of the by-product; the increase in the feed water temperature not only fully utilizes the waste heat and increases the amount of by-product high and low-pressure steam, but also enables the feed water to deoxygenate, thereby extending the service life of the by-product steam jacket.

The application provides a polysilicon production process and system, and relates to the technical field of polysilicon production. H2 produced by chlor-alkali electrolysis is used as hydrogen gas raw material of a hydrogen chloride synthesis process, a polysilicon reduction process and a cold hydrogenation process; Cl2 produced by chlor-alkali electrolysis is used as chlorine raw material of the hydrogen chloride synthesis process; hydrogen chloride produced by the hydrogen chloride synthesis process is provided to the cold hydrogenation process; silicon powder, SiCl4, HCl and H2 are reacted in a cold hydrogenation reactor; crude trichlorosilane produced by the cold hydrogenation process is provided to rectification for fractionation; intermediate product dichlorodisilane is produced by a fixed bed to generate silane; intermediate product silicon tetrachloride and hydrogen gas are used as raw materials of the cold hydrogenation process to generate trichlorosilane; and the trichlorosilane is used as one of raw materials of the polysilicon reduction process to generate polysilicon. The application can fully utilize raw materials and by-products, reduce the dependence of the production system on the outside world, and effectively reduce the amount of three wastes.

A method for preparing metallic magnesium and industrial silicon by decomposing serpentine with hydrochloric acid is provided. Serpentine is used as a raw material, and is processed by a two-stage countercurrent leaching process in a hydrochloric acid system. A hydrometallurgical process is adopted, including beneficiation, wet grinding, slurry storage, filtration, two-stage atmospheric pressure hydrochloric acid leaching, washing and filtration of leached silica slag, iron removal and nickel precipitation from a leachate, separation, washing and filtration of a ferric hydroxide precipitate and a nickel hydroxide precipitate, crystallization and evaporation of a magnesium chloride solution, and hydrochloric acid preparation from a flue gas generated after thermal decomposition of magnesium chloride. The present disclosure develops a process of decomposing serpentine with hydrochloric acid and producing metallic magnesium by a drying-electrolysis method, and a process of producing industrial silicon by smelting silica slag in an electric furnace.

Disclosed in the present invention is a method for recycling a chloride solution from a metal smelting separation process by means of electrolysis. A metal chloride solution and a sodium chloride solution obtained from a metal smelting separation process are recovered, a sodium hydroxide solution prepared by means of an electrolysis method and hydrochloric acid are recycled for the metal smelting separation process, and CO2 generated in a roasting process is recovered and is cyclically used in a metal carbonization and precipitation process, thereby achieving the recycling of the materials from the smelting separation process. Moreover, the technique has good applicability, and solves problems common in the industry at present, such as the high energy consumption and costs of the end-of-pipe treatment of wastewater, and difficulties in material recycling.

The invention discloses a silicon carbide hydrochloric acid synthesis furnace, and relates to the technical field of industrial hydrochloric acid preparation. The silicon carbide hydrochloric acid synthesis furnace comprises a synthesis section, a byproduct steam section, an absorption section and a separation section, the synthesis section is fixedly connected with the byproduct steam section, the byproduct steam section is fixedly connected with the absorption section, and the absorption section is fixedly connected with the separation section. The synthetic furnace can adopt an upper ignition mode, the ignition mode can be well matched with the hydrogen chloride absorption function, the hydrogen chloride preparation function, the byproduct high-temperature steam preparation function and the hydrochloric acid absorption function are integrated in one synthetic furnace, and the problem that a traditional synthetic furnace cannot be provided with the hydrochloric acid absorption function at the same time due to a lower ignition mode is solved. The number of equipment and supporting facilities are reduced, and the cost of the device for preparing the hydrochloric acid by synthesizing the hydrogen and the chlorine is effectively reduced.

Methods and compositions are provided for deriving supplemental cementitious materials, such as cement and / or pozzolans, from one or more non-limestone materials, such as one or more non-limestone rocks and / or minerals, which are processed in a manner that produces a desired product, such as cement and / or supplemental cementitious material.

Integrations of carbon monoxide electrolyzers and chlor-alkali electrolyzers are disclosed herein. The disclosed integrations include novel process chains for the valorization of oxocarbons into hydrochloric acid, vinyl chloride, vinyl acetate, ethylene oxide, and other useful chemicals. The disclosed integrations further include novel ways to operate the electrolyzers in tandem to increase the efficiency of both reactors. This disclosure also includes novel ways to balance the operation of both electrolyzers to assure they are operating at an optimal level to take advantage of the benefits of the disclosed integrations.

A process for producing lithium carbonate, including: producing a lithium chloride containing solution; in the presence of a monovalent (M+) hydroxide, contacting this solution with a first organic medium, in an extraction step of a lithium solvent extraction stage, to produce a lithium-loaded organic medium and a raffinate; treating the raffinate to produce a treated raffinate; in a stripping step of the lithium solvent extraction stage, stripping the lithium-loaded organic medium by means of an aqueous stripping solution containing an acid, to extract the lithium cations from the lithium-loaded organic medium, producing an aqueous lithium chloride solution and a stripped organic medium; separating this solution from the stripped organic medium; recycling the stripped organic medium to the extraction stage; reacting the lithium chloride solution with carbonate to produce lithium carbonate and a mother liquor containing chloride, carbonate, and a monovalent cation; and subjecting the treated raffinate to chlor-alkali electrolysis.

A method by which an environmental energy (e.g., wave energy) is harvested, converted into electrical power, and thereafter used to electrolyze seawater into hydrogen and chlorine gases. Those gases are recombined into hydrogen chloride from which is formed hydrochloric acid solution which is diluted and deposited at a depth sufficient to ensure its neutralization and sequestration for a significant period of time (e.g., for over a millennium). By removing chloride ions from a portion of the sea adjacent to its upper surface and depositing them into a portion of the sea more adjacent to its bottom, acidity is shifted from the surface to base of the sea, and the surface ocean is given a greater ability to absorb and buffer atmospheric carbon dioxide without a corresponding increase in acidity.