155results about "Hydrogen chloride preparation" patented technology

The present invention relates to a process for producing high purity lithium hydroxide monohydrate, comprising following steps: concentrating a lithium containing brine; purifying the brine to remove or to reduce the concentrations of ions other than lithium; adjusting the pH of the brine to about 10.5 to 11 to further remove cations other than lithium, if necessary; neutralizing the brine with acid; purifying the brine to reduce the total concentration of calcium and magnesium to less than 150 ppb via ion exchange; electrolyzing the brine to generate a lithium hydroxide solution containing less than 150 ppb total calcium and magnesium, with chlorine and hydrogen gas as byproducts; producing hydrochloric acid via combustion of the chlorine gas with excess hydrogen and subsequent scrubbing of the resultant gas stream with purified water, if elected to do so; and concentrating and crystallizing the lithium hydroxide solution to produce lithium hydroxide monohydrate crystals.

A method of producing HCl from H₂ and Cl₂ is provided. In some embodiments, the method comprises at least one photochemical chamber placed in fluid communication with at least one source of H₂ and at least one source of Cl₂. In some embodiments, the photochemical chamber effects the formation of HCl through the use of at least one source of ultraviolet radiation contained therein. In some embodiments, the HCl product may be captured and used as a gas. In some embodiments, the HCl product may be absorbed into water to form an aqueous HCl solution.

The invention discloses a green recycling method for steel pickling waste liquor. The green recycling method is characterized by specially comprising the following steps: neutralizing low-concentration pickling waste liquor with inorganic base, thereby obtaining ferric hydroxide or ferrous hydroxide precipitates and low-concentration saline water; performing acid and iron separation on high-concentration pickling waste liquor, thereby obtaining recycled acid and a ferric acid containing solution; dehydrating ferric hydroxide or ferrous hydroxide precipitates, and then, adding the ferric acid containing solution to obtain high-concentration iron salt solution; concentrating the low-concentration saline water to obtain concentrated saline water and recyclable water; electrolyzing concentrated saline water to prepare chlorine gas and an inorganic base solution; circulating the inorganic base solution for neutralizing pickling waste liquor; leading chlorine gas into the recycling acid to improve concentration of hydrochloric acid, and recycling concentrated recycled acid to a pickling line; and leading chlorine gas into a high-concentration iron salt solution to prepare a flocculatingagent. The green recycling method has the advantages that: a utilization rate of the pickling waste liquor is expected to be greatly increased, emission of three wastes of gas, liquid and solid is avoided throughout the process, and the method is economical, green and environmentally friendly.

The invention relates to a novel combined type hydrogen chloride synthetic furnace with a byproduct of high-pressure steam. The novel combined type hydrogen chloride synthetic furnace comprises a synthetic furnace and a cooler at the top of the synthetic furnace, wherein the synthetic furnace is divided into an upper section, a middle section and a lower section; each of the upper section and the lower section consists of a graphite cylinder and a steel shell sleeved outside the cylinder; and the middle section is the steel shell which is formed by a plurality of vertical steel condensation tubes in annular sealed matching. The novel combined type hydrogen chloride synthetic furnace provided by the invention has the following advantages that the middle section of the synthetic furnace is changed from an original structure comprising a steel shell and an inner graphite cylinder into a steel shell structure which is formed by the plurality of vertical steel condensation tubes in annular sealed matching, so that the pressure for generating steam is improved; and meanwhile, a flow guide structure is additionally arranged at a flange connection part between the upper section and the middle section, and a flow guide ring is arranged at the lower end surface of a graphite heat exchange block, so that hydrochloric acid is prevented from corroding the steel shell by spreading to a flange surface of a flange and then being in contact with the steel shell of the lower section of the cylinder, and the service life of the synthetic furnace is improved.

The methods and systems for producing hydrogen on demand use aluminum, a heat source and an electrical source, such as, but not limited to, solar power. The heat source and electrical source is used to produce chemical intermediates from sodium chloride via electrolysis. The chemical intermediates from the sodium chloride may be reacted with aluminum to produce hydrogen. The on-demand hydrogen systems can generate a continuous stream of hydrogen that can power a home or business. Alternatively, or in addition, the on-demand hydrogen system can be incorporated into a vehicle to power the vehicle.

The invention provides a method and a device for preparing hydrochloric acid and purifying quartz sand. The method comprises the following steps: igniting hydrogen and chlorine in a synthetic furnace, carrying out a reaction to produce hydrogen chloride gas, releasing heat, and controlling the temperature of hydrogen chloride gas at the outlet of the synthetic furnace to be 500-1300 DEG C; heating cooling air in a gas cooling device, introducing the air into the bottom of a drying device filled with semi-finished quartz sand, allowing hot air to flow from the bottom upwards, drying the semi-finished quartz sand, and taking the moisture therein; allowing the dried semi-finished quartz sand into a chlorination impurity removal device by the drying device, and completing purification of the quartz sand; allowing the hydrogen chloride gas and metal chloride gas in the chlorination impurity removal device to flow out of the top, and allowing the gas to enter the gas cooling device. According to the method disclosed by the invention, the whole quartz sand purification process can be energy-saving and low in cost on the premise of guaranteeing the quality of synthetic hydrochloric acid, and the purified quartz sand is high in purity.

Disclosed is a process for manufacturing bleach (or sodium hypochlorite) and caustic potash (or KOH) without the need for shipping or storing chlorine gas. Specifically, the present invention relates to the manufacture of potassium hydroxide and chlorine gas, through several process options, for the manufacture of sodium hypochlorite (or bleach), hydrochloric acid (HCl) and/or other chlorinated compounds. The disclosed process allows operating flexibility based on chlorine demand, reduces capital costs and eliminates the need for the transportation and storage of chlorine gas.

The invention relates to a method for preparing high-purity hydrogen chloride. Firstly, an efficient adsorbent is prepared, electronic-grade hydrogen and electronic-grade chlorine enter a synthesis furnace to synthesize hydrogen chloride, the synthesized hydrogen chloride enters an adsorption tower containing the efficient adsorbent for refining and dechlorination, the adsorbed hydrogen chloride gas is cooled and liquefied, hydrogen and noncondensable gas are removed, and a high-purity hydrogen chloride product is obtained.

The invention relates to a method for preparing aluminum oxide through hydrochloric acid leaching and two-stage electrolysis of bauxite and comprehensively utilizing aluminum oxide. The method comprises the following steps: carrying out hydrochloric acid leaching, solid-liquid separation and purification on bauxite on bauxite, so as to obtain an iron chloride mixed solution and an aluminum chloride mixed solution; respectively separating and purifying the iron chloride mixed solution and the aluminum chloride mixed solution, so as to obtain scandium chloride, gallium chloride, an aluminum chloride water solution and an iron chloride water solution; setting electrolytic voltage and current density, and respectively carrying out two-stage electrolysis on the aluminum chloride water solution and the iron chloride water solution, so as to respectively obtain aluminum hydroxide, hydrogen and chlorine as well as iron hydroxide, hydrogen and chlorine; preparing a hydrochloric acid solution by using the generated hydrogen and chlorine, and returning the hydrochloric acid solution to a leaching stage for recycling; and roasting aluminum hydroxide, so as to obtain metallurgy level aluminum oxide or chemical aluminum oxide. Compared with a traditional acid method, the electrolysis method for recycling aluminum oxide in the bauxite and processing the bauxite has the advantages that the evaporation step and equipment, the concentration step and equipment are omitted, the operation is simplified, meanwhile, the cost is substantially lowered, and the product has relatively high purity.

The invention discloses a green and environment-friendly white carbon black and caustic soda circulation combined production method. The method comprises the following steps: (1), performing a reaction on sodium silicate and hydrochloric acid to obtain a silica precipitation filter cake and a sodium chloride solution; (2), washing and slurrying the silica precipitation filter cake, and performingdrying, crushing and packaging to obtain a finished white carbon black product; (3), treating the sodium chloride solution by an RO membrane twice to obtain a sodium chloride solution with concentration of 12%; (4), performing multi-effect evaporation purification on the sodium chloride solution with concentration of 12% to obtain a sodium chloride solution with concentration of 36%; (5), electrolyzing the sodium chloride solution with concentration of 36% to obtain sodium hydroxide, hydrogen and chlorine, and illuminating hydrogen and chlorine to obtain hydrochloric acid; (6), adding quartz sand to sodium hydroxide for a reaction to generate sodium silicate; (7), adding hydrochloric acid to sodium silicate to prepare white carbon black again. By combined production and recycling, zero emission of water can be basically realized, production cost and environmental protection cost are greatly reduced, and the method is a good method for industrial production of the white carbon black.

The invention discloses a production process of electronic-grade hydrochloric acid and relates to the technical field of chemical engineering. The production process of electronic-grade hydrochloric acid comprises the following steps: industrial-grade hydrochloric acid is placed in a reaction kettle, hydrazine hydrate is added to the reaction kettle, and the substances are stirred and mixed untilsufficient reaction; the material obtained after reaction is totally guided into a deacidification tower, negative pressure is maintained in the deacidification tower, air is introduced into the deacidification tower for bubbling stirring and blowing desorption of a solution, and escape gas and a tower bottom solution are obtained; the desorbed escape gas in the deacidification tower is compressedby a compressor; compressed escape gas enters an acid pickling tower for acid pickling, electronic-grade hydrochloric acid is obtained, non-condensable gas returns to the bottom of the deacidification tower for bubbling circulation, and negative pressure is maintained in the acid pickling tower. According to the production process of electronic-grade hydrochloric acid, new impurities are not introduced during reduction of free chlorine, waste gas or impurities produced in the production process is/are reasonably treated or applied, environmental pollution is avoided, and reasonable utilization of resources is realized.

The present invention provides a method for producing high-purity hydrogen chloride, comprising the steps of: purifying each of crude hydrogen and crude chlorine as raw materials to a purity of 99.999% or higher; reacting an excessive molar amount of the purified hydrogen with the purified chlorine at a temperature ranging from 1,200° C. to 1,400° C. to synthesize hydrogen chloride; converting the hydrogen chloride to a liquid state by compression; and purifying the hydrogen chloride and separating unreacted hydrogen by fractional distillation. The invention also provides a system for carrying out the method. According to the method and system, an environmentally friendly production process can be provided, which can easily produce a large amount of hydrogen chloride having a purity of 3 N (99.9%)-6 N (99.9999%) in a cost-effective manner and enables energy consumption to be significantly reduced.

The invention provides a process for preparing fumed silica and activated carbon at low temperature with rice hull ash as a raw material. In the process, rice hull ash and other kinds of waste are used as the raw material and react with fluorine-containing acid liquor, hydrochloric acid and nitric acid to prepare high-value-added products fumed silica and activated carbon, the content of SiO2 in the prepared products is larger than 99.9%, the specific area measured through a multi-point BET method is 350-500 m<2>/g, and the effect of turning waste into wealth is achieved. Acidic gas generated in the preparation process is absorbed through a negative pressure water absorbing tank to prepare corresponding acidic liquid, and when concentrated to certain concentration, the acidic liquid can be used circularly. The invention further provides a production device used in the process, parts used in the production device are common tools used in a chemical plant and low in cost, and large-scale industrial production can be achieved.

The invention relates to a method of producing hydrogen chloride. The purpose of the invention is to provide a method of producing hydrogen chloride that can inhibit temperature rising of a reaction system through more simple steps. According to the producing method, hydrogen and chlorine are irritated in the existence of hydrogen chloride gas, and the hydrogen chloride gas is generated because of reaction between hydrogen and chlorine.

The invention discloses a method for realizing zero discharge and resource utilization of reverse osmosis concentrated water in coal chemical industry. The method comprises the following steps: removing hardness and silicon from reverse osmosis concentrated water, carrying out advanced oxidation on the effluent to remove organic matters, feeding into a nanofiltration system, and separating salts to obtain sodium sulfate concentrated water and sodium chloride produced water; concentrating the sodium sulfate concentrated water by a concentrated water membrane, adding an oxidant, carrying out concentrated water hydrothermal concentration treatment, and carrying out potassium sulfate preparation treatment on the effluent to obtain a potassium sulfate product and a sodium chloride solution; andcarrying out water production membrane concentration treatment on the sodium chloride produced water, carrying out produced water thermal concentration treatment, and feeding the effluent into an ionic membrane electrolysis unit to obtain H2, Cl2 and a 30% NaOH solution, wherein H2 and part of Cl2 are used for preparing a hydrochloric acid solution, and part of Cl2 and part of the NaOH solution enter a NaClO preparation unit to prepare NaClO. According to the method, reverse osmosis concentrated water is pretreated to prepare the approximately saturated sodium chloride and sodium sulfate concentrated salt water without crystallization so as to reduce the treatment cost, and finally the concentrated salt water is prepared into acid-alkali and potassium sulfate with industrial values, so that resource utilization is realized, and the method has good application prospect.

What is described is an apparatus for performance of a process for hydrogen chloride synthesis from chlorine and hydrogen or from chlorine and hydrocarbons with integrated heat recovery, wherein the combustion chamber and the heat exchanger are arranged in the steam drum of a shell boiler which works according to the waste heat boiler principle.