139results about "Hydrogen sulfides" patented technology

The invention relates to the technical field of hydrogen sulfide, in particular to a system and method for preparing high-purity hydrogen sulfide gas, and the system comprises a hydrogen sulfide concentration analysis module, a purification regulation control module, a processing parameter optimization module, an anomaly detection correction module and a leakage monitoring positioning module. According to the invention, through real-time multi-point monitoring and comprehensive data analysis, the accuracy and dynamic regulation capability of the hydrogen sulfide purification process are improved, rapid response to tiny change of hydrogen sulfide concentration is allowed, the high-purity standard is continuously maintained in a changing industrial environment, and the purification efficiency is improved through the accurate recognition and regulation mechanism of concentration fluctuation; meanwhile, environment and safety risks caused by misoperation are reduced, the safety monitoring capacity of the system is enhanced through the real-time anomaly detection and leakage positioning technology, the continuity and safety of the production process are guaranteed by preventing potential leakage and responding to abnormal conditions, and the production efficiency is improved while the quality of hydrogen sulfide is guaranteed. And the risks of environmental pollution and production accidents are reduced.

The invention provides a method for preparing phosphorus pentafluoride, which comprises the following steps: (a) mixing sulfur and phosphorus, and reacting at the temperature of 320-340 DEG C to generate phosphorus pentasulfide; (b) reacting phosphorus pentasulfide with hydrogen fluoride gas at the temperature of 170-190 DEG C, cooling the reaction product to-85 to-60 DEG C, and performing low-temperature rectification separation to obtain pure phosphorus pentafluoride and byproduct hydrogen sulfide; the molar ratio of phosphorus pentasulfide to hydrogen fluoride gas is (1-9.5): 10.2. The phosphorus pentafluoride can be efficiently prepared in an environment-friendly manner by adjusting the reaction conditions and the raw material ratio and reacting the easily available raw materials; and moreover, an electrolysis technology is further introduced to treat the hydrogen sulfide byproduct, so that the purity and efficiency of sulfur recovery are optimized, the purposes of environment-friendly and efficient recovery and utilization of the byproduct are achieved, the overall economical efficiency and safety of the process are improved, and the whole process chain is further perfected.

The invention provides a sewage steam stripping thermal self-circulation system which is characterized in that a first heat exchanger receives acidic water and is connected with a hot feed inlet of a steam stripping tower through a second heat exchanger, a first gas outlet of the steam stripping tower outputs ammonia gas through the second heat exchanger, and a second gas outlet outputs hydrogen sulfide; a purified water outlet of the stripping tower is respectively connected with a steam reboiler and a purified water inlet of a steam generator, a liquid outlet of the steam reboiler is connected with a condensed water inlet of the steam generator, a purified water outlet of the steam generator outputs purified water through a first heat exchanger, and a steam outlet and a condensed water outlet of the steam generator are connected with a steam compressor. And a steam outlet of the steam compressor is connected with a steam inlet of the steam reboiler. The problem of heat waste of purified water and condensed water can be solved, full utilization of medium-high temperature waste heat is achieved, the heat exchange process of raw material water is improved, the to-be-cooled temperature of the purified water is reduced, and energy loss is reduced.

The utility model relates to a sulfur recovery tail gas purification electronic grade hydrogen sulfide system which comprises an MDEA absorption tower, a regeneration tower, a temperature swing adsorption device, a light component removal tower and a heavy component removal tower which are sequentially connected along the material flow direction, and the light component removal tower and the heavy component removal tower are connected with ammonia circulation refrigeration devices. According to the system, tail gas is separated and purified by adopting an MDEA absorption preliminary separation + adsorption dehydration + rectification purification process, a high-purity electronic-grade hydrogen sulfide product is obtained, an alkali absorption tail gas treatment process is replaced, and the economic value of the tail gas is greatly improved. Cheap and easy-to-obtain ammonia is adopted as a refrigerant for compression decompression circulation to provide cooling capacity for the system, the temperature and the cooling capacity are utilized in a gradient mode, heat is provided by cheap and easy-to-obtain circulating water, and the cost of the purification system is low.

A composite material is used for desulfurization. The composite material contains activated carbon, alkali metal oxides, silicon oxides, iron oxides, and rare earth element oxides. The weight ratio among the activated carbon, iron oxides and rare earth element oxides is 100:(0.5-5):(1-10). The composite material, used as a sulfur adsorbent, has a higher sulfur breakthrough capacity and desulfurization rate.

A method for producing a hydrogen-containing gas stream containing hydrogen sulfide with concomitant production of low-sulfur carbonaceous material comprises the steps of (i) providing a hydrocarbon feed gas stream containing sulfur-containing compounds; (ii) supplying carbonaceous particles to a reactor and subjecting the feed gas stream to pyrolysis in the reactor over a moving bed of the carbonaceous particles; (iii) recovering a stream of hydrogen-containing gas stream containing hydrogen sulfide; and (iv) recovering low-sulfur carbonaceous particles. Sulfur ends up in the form of hydrogen sulfide, which is either harmless for selected downstream applications, or is purposively used in selected downstream applications or could be easily removed from the hydrogen stream. A desulfurization step before thermocatalytic conversion of sulfurous hydrocarbon feedstocks is not necessary.

The utility model discloses a hydrogen sulfide synthesis skid-mounted system which comprises a liquid sulfur transfer module, a hydrogen sulfide synthesis module, a product gas pretreatment module, a product gas purification module, a tail gas treatment module and a public engineering module, the liquid sulfur transfer module, the hydrogen sulfide synthesis module, the product gas pretreatment module, the product gas purification module and the tail gas treatment module are sequentially communicated, and the product gas pretreatment module and the product gas purification module are both communicated with the liquid sulfur transfer module. According to the hydrogen sulfide synthesis skid-mounted system disclosed by the utility model, each functional component is modularized, the size of each module is configured in a coordinated manner and meets the transportation condition, corresponding process pipelines, instrument components, cables and the like can be prefabricated and mounted when leaving a factory, and debugging work can be carried out only by simple assembly and construction on a construction site; the workload of a construction site is greatly reduced, waste of installation materials is effectively reduced, and the device has the advantages of being small in occupied area, low in construction cost and the like.

The application provides a reactor and a method for preparing hydrogen sulfide, and solves the technical problems of complex structure, low production efficiency and short service life of the catalyst of the existing equipment. The reactor is provided with a shell, an upper head and a lower head, an upper partition plate is arranged between the shell and the upper head, a lower partition plate is arranged between the shell and the lower head, at least one hydrogen gas feeding pipe and at least one sulfur feeding pipe are arranged on the reactor, at least one hydrogen gas discharging hole is arranged on the wall of the hydrogen gas feeding pipe, at least one sulfur discharging hole is arranged on the wall of the sulfur feeding pipe, a mixing pipe is arranged at the central axis of the reactor, at least one gas inlet hole is arranged on the wall of the mixing pipe, and at least one reaction pipe is arranged on the reactor. The application can be widely applied to the technical field of hydrogen sulfide reaction equipment.

The utility model discloses a sulfuric acid leaching kettle which comprises a barrel body, a flat cover is connected to the upper end of the barrel body, a stirring device is connected to the center of the flat cover, a stirring shaft of the stirring device is arranged at the center of the interior of the barrel body, and a bottom supporting seat is arranged at the bottom of the barrel body; a cleaning device is arranged below the bottom supporting base, and a discharging port is formed in the center of the bottom of the barrel. The utility model has the advantages that the cleaning device synchronously rotates along with the stirring shaft, so that sediments at the bottom of the kettle can be conveniently and timely cleaned; the spraying holes of the spraying ring spray corresponding media into the equipment so as to eliminate foam above the liquid level or absorb corresponding gas or impurities through spraying liquid, and meanwhile, cleaning media can be sprayed through the spraying holes so as to clean the tank wall and part of the stirring shaft in real time.

A reactant generation system for a continuous production lithium sulfide fluidised bed reactor is disclosed which comprises a hydrogen generator in fluid communication with a natural gas source and a

The present invention provides a waste liquid purification method and device for thiopropionic acid ester series products, the method comprising: (a) sending the waste liquid into a preheater for preheating, sending it into a third-effect evaporator, evaporating and recovering ammonia, hydrogen sulfide and part of water to obtain residual liquid a; (b) sending the residual liquid a obtained in step (a) into a second-effect evaporator, evaporating and recovering part of the water, obtaining residual liquid b, and obtaining residual liquid c after four steps of desulfurization, extraction, filtration and liquid-liquid separation; (c) sending the residual liquid c obtained in step (b) into a first-effect evaporator, evaporating and recovering part of the water, filtering, and obtaining residual liquid d; (d) sending the residual liquid d obtained in step (c) into a crystallization tower to obtain high-purity sodium thiosulfate pentahydrate crystals. The present invention has the advantages of simple principle, high degree of automation, low labor intensity, high purity of recovered products, no waste discharge, and easy industrialization.

A method for producing a chalcogen-containing compound semiconductor is provided, the method comprising: providing a processing chamber (3) with at least one substrate (5) coated with a precursor (4) of the chalcogen-containing compound semiconductor; heat-treating the at least one coated substrate (5) in the processing chamber (3), wherein during the heat treatment, a gaseous atmosphere containing at least one gaseous chalcogen compound is provided in the processing chamber (3); removing the gaseous atmosphere present after the heat treatment of the coated substrate (5) as exhaust gas from the processing chamber (3); and cooling the exhaust gas in a gas processor (13), wherein multiple types of gaseous chalcogen compounds present in the exhaust gas after the heat treatment of the coated substrate (5) are converted to liquid or solid states, thereby separating them from each other in time and space from the exhaust gas. An apparatus designed to carry out this method is also provided.

Generally, non-CO2 containing salts in molten form i Removal of acid gases (e.g., non-carbon dioxide acid gases) using an acid gas adsorbent, and related systems and methods, are described. Also generally described are processes and related systems for regenerating the adsorbent at elevated temperatures. Certain aspects relate to methods. In some embodiments, the method includes exposing a non-CO2 acid gas adsorbent comprising a salt in molten form to an environment containing non-CO2 acid gases, such that at least a portion of the non-CO2 acid gases interact with the non-CO2 acid gas adsorbent and at least a portion of the non-CO2 acid gases are removed from the environment.

The invention belongs to the technical field of chemical separation, and discloses a two-stage low-temperature condensation coupling compression separation high-purity hydrogen sulfide purification process and system. The system consists of a two-stage low-temperature condensation unit, a hydrogen sulfide compression unit and a hydrogen sulfide collection unit, the two-stage low-temperature condensation unit comprises a hydrogen sulfide liquid separation tank, a hydrogen sulfide low-temperature cooler, a hydrogen sulfide low-temperature liquid separation tank, a hydrogen sulfide heat exchanger and a hydrogen sulfide saline water liquid separation tank. Hydrogen sulfide raw material gas containing carbon disulfide impurities is sequentially introduced into a two-stage low-temperature condensation unit, carbon disulfide is liquefied and separated out preferentially, low-temperature water is adopted in the first stage, and materials subjected to cryogenic compression throttling are adopted in the second stage for heat exchange; pressurizing and compressing the primarily purified hydrogen sulfide gas-phase component, and then condensing and separating to remove trace carbon disulfide and recover cold energy, thereby finally obtaining the high-purity hydrogen sulfide with the purity of more than or equal to 99.95%. According to the invention, a low-temperature two-stage low-temperature condensation-pressurized compression condensation coupling separation technology is adopted, and deep removal of carbon disulfide is realized under the condition that a third component is not introduced.

The invention provides an infrared light release hydrogen sulfide nanoreactor. The infrared light release hydrogen sulfide nanoreactor comprises an injectable PVA / PVP transparent conductive hydrogel and an SNSs / PEI-DTC compound, wherein the interior of the injectable PVA / PVP transparent conductive hydrogel is filled with the SNSs / PEI-DTC compound; the SNSs / PEI-DTC compound is prepared from a donor PEI-DTC and a two-dimensional silylene nanosheet loaded on the surface of the donor PEI-DTC. The invention innovatively provides a light field in-situ controlled release hydrogen sulfide treatment gas for protecting spinal cord neurons from secondary injury, and due to the advantage of good lipid solubility of hydrogen sulfide, the hydrogen sulfide is extremely easy to pass through a blood brain spinal cord barrier and a cell membrane barrier to enter an intracellular structure for treatment of spinal cord injury.

The disclosure relates to methods of irradiating a gas containing hydrogen sulfide (H2S) with high energy light to photolytically cleave some of the hydrogen sulfide in the gas to form sulfur-containing reactive species. The sulfur-containing reactive species act as autocatalysts that react with some of the remaining hydrogen sulfide in the gas to generate hydrogen gas and one or more sulfur-containing products. The methods remove hydrogen sulfide from the gas and produce hydrogen gas. The methods can be implemented in a component of a hydrocarbon producing well (e.g., a wellhead, a flow line, a production casing, a production tubing), a component used to transport the gas mixture produced by the well (e.g., a transportation pipeline), a gas treatment system (e.g., a tail gas treatment system), a borehole and / or an underground formation.

The present application relates to the technical field of recycling of organic waste liquid, and particularly relates to a system and method for regenerating hydrogen sulfide and carbon dioxide by using MEDA waste liquid. The system for regenerating hydrogen sulfide and carbon dioxide by using MEDA waste liquid provided by the present application comprises: a MEDA waste liquid tank; a lean-liquid rich-liquid heat exchanger connected with the MEDA waste liquid tank; a regeneration tower connected with a rich-liquid outlet of the lean-liquid rich-liquid heat exchanger; a cooler connected with a gas outlet of the regeneration tower; and a membrane separation device connected with a gas outlet of the cooler; and the membrane separation device is provided with a hydrogen sulfide gas outlet and a carbon dioxide gas outlet. The system and method for regenerating hydrogen sulfide and carbon dioxide by using MEDA waste liquid can remove the dissolved waste gas in the MEDA, realize the recycling of the MEDA solution, and simultaneously produce high-purity hydrogen sulfide and food-grade carbon dioxide products.

The present invention provides a process and apparatus for preparing high-purity hydrogen sulfide, relating to the technical field of hydrogen sulfide preparation. The process comprises obtaining high-purity sulfur, melting the high-purity sulfur in a sulfur melting kettle to produce liquid high-purity sulfur, preparing hydrogen gas and heating the hydrogen gas, and then sending the liquid high-purity sulfur and the heated hydrogen gas to a reaction tower for reaction to produce high-purity hydrogen sulfide gas. In the present invention, the use of high-purity sulfur and high-purity hydrogen to prepare hydrogen sulfide can reduce the generation of impurity gases and improve the purity of the hydrogen sulfide gas.

A hydrogen sulfide purification method includes removing a lithium raw material by using an ejector that utilizes a cleaning liquid as a driving fluid, from a mixed gas containing unreacted hydrogen sulfide and the lithium raw material which is generated in a process of producing lithium sulfide by a reaction of hydrogen sulfide and the lithium raw material.

Methods for harvesting hydrogen from a natural hydrogen production zone are described. The method comprises introducing a stream (e.g., injection stream, sequestration stream) comprising sulfur dioxide into a natural hydrogen production zone to produce a gas mixture containing hydrogen sulfide; harvesting the gas mixture containing hydrogen sulfide; and converting the hydrogen sulfide to hydrogen, thereby harvesting hydrogen from the natural hydrogen production zone. The natural hydrogen production zone can be a ground subsurface or a subsurface of the ocean floor. Introducing the stream comprising sulfur dioxide can be performed by injection, sequestration, pumping, infusion or other methods for delivering sulfur dioxide to a well (e.g., gas injection well) at the natural hydrogen production zone.

The invention relates to a hydrogen sulfide separation system (A) and method for producing pure hydrogen (30) with high efficiency and environmental sustainability for the energy sector, while also converting sulfur (40) into economic value by producing sulfuric acid (60) The system includes a gasification unit (100) to convert liquid hydrogen sulfide (10) into gaseous hydrogen sulfide (20), an electrolyzer (200) equipped with a palladium-alloy membrane (290) to separate hydrogen (30) and sulfur (40) through electrolysis, and an oxidation unit (300) to oxidize sulfur (40) using hydrogen (30) and oxygen (50), resulting in sulfuric acid (60). The method enhances energy efficiency, reduces operating costs, and offers a sustainable solution for hydrogen production.

The present invention discloses a production circulation system for thiophene. Two mixers are arranged successively before and after on the reaction pipeline. The butadiene inlet pipeline is communicated with the side of the first production mixer. The sulfur inlet pipeline is branched into two branches, which are respectively communicated with the tops of the first production mixer and the second production mixer. The gas-liquid product outlet is arranged below the second production mixer; a heat exchanger assembly is provided in the tar separator; the gas-liquid mixture coming out from the top of the gas outlet of the tar separator enters the condenser, and thiophene is separated out from the outlet of the condenser; the gas-liquid mixture treated by the condenser sequentially enters two pressurization and cooling processors; the liquefied gas coming out from the second pressurization and cooling processor is circulated to the butadiene inlet pipeline through a pipeline. The purpose of the present invention is to provide a production system that can effectively reduce the generation of tar in the reaction system, improve the thiophene yield, and effectively treat other hydrogen components and heavy components.

The present application pertains to a method of making carbon disulfide. The method comprises reacting methane and sulfur under conditions sufficient to produce carbon disulfide, hydrogen disulfide, and heat. At least a portion of the produced hydrogen disulfide is reacted with methane under conditions sufficient to produce a mixture comprising carbon disulfide and hydrogen. Advantageously, at least a portion of the heat from reacting methane and sulfur is employed in the reacting of at least a portion of the produced hydrogen disulfide with methane.

A process of cleaning a gas stream is described. The gas stream may include a tail gas generated during the production of the carbon black. The process includes a plurality of steps to systematically clean the starting gas stream to obtain a treated gas stream of fuel value and to convert other portions of the gas stream to sulfur and carbon dioxide for recovery. Further described is an installation or system having various operating units for carrying out the process of the invention.

The present disclosure includes the following steps: a. directing a quantity of recycle gas into contact with an aqueous solution containing hydrogen sulfide and separating the hydrogen sulfide-containing gas from the aqueous solution; b. heating the gas, optionally including hydrogen sulfide, after addition of the oxygen source to provide a process feed gas; c. Inducing the oxidation of hydrogen sulfide to sulfur dioxide in a hydrogen sulfide oxidation step; d. directing the sulfur dioxide rich gas into contact with a material catalytically active in the oxidation of sulfur dioxide to sulfur trioxide in a sulfur dioxide oxidation step to provide a sulfur trioxide rich gas; e. cooling the sulfur trioxide rich gas in a condensing step to allow for hydration of sulfur trioxide and condensation of sulfuric acid to provide a concentrated sulfuric acid stream and a purified process gas; The present invention relates to a method for purifying an aqueous solution containing hydrogen sulfide, comprising: In a recycling step, at least a portion of the purified process gas is directed as a recycled gas.

The present invention belongs to the field of preparation methods of aliphatic disulfides, and particularly relates to a method for catalytic synthesis of symmetrical dialkyl disulfides, which is implemented according to the following steps: (1) Place a magnetic stirrer bar, measured thiol, sulfur, and an organic superbase catalyst into a reaction flask; (2) Place the reaction flask in an oil bath of a magnetic heating stirrer, install a condenser, and connect the condenser to a drainage bottle through a silicone rubber tube. A saturated aqueous solution of H<subgt;2< / subgt;S is pre-added to the drainage bottle; (3) Start heating and begin stirring the reaction, start timing, and determine the amount of H<subgt;2< / subgt;S released and the reaction termination time by the drainage method to obtain the target product. The reaction conditions of the present invention are mild, the reaction rate is fast, the atomic utilization rate and the yield are high, and the by-product H<subgt;2< / subgt;S gas is easily separated and utilized.

A method for producing hydrogen sulfide by reacting sulfur gas and hydrogen gas in a reaction tank (101) to synthesize hydrogen sulfide, the method including: step (A) for supplying a gas mixture of sulfur gas with hydrogen gas to the reaction tank (101); step (B) for supplying hydrogen gas to the reaction tank (101); and step (C) for reacting the sulfur gas with the hydrogen gas to synthesize hydrogen sulfide. The amount of sulfur in the reaction tank (101) is detected and the amount of the hydrogen gas supplied in step (B) is adjusted according to the result.

Methods and systems are provided for treating the tail gas stream of a sulfur recovery plant. The methods including generating a tail gas stream from a sulfur recovery plant, treating the tail gas stream with a hydrogen sulfide removal unit and a hydrogen selective membrane unit, generating a stream low in hydrogen sulfide and a stream rich in hydrogen. The hydrogen sulfide rich stream is recycled to the sulfur recovery unit. The hydrogen selective membrane unit includes a glassy polymer membrane selective for hydrogen over hydrogen sulfide and carbon dioxide.

The present invention relates to a preparation method of lithium sulfide having excellent performance as a solid electrolyte raw material, and lithium sulfide prepared therefrom. Specifically, the present invention relates to: a preparation method of lithium sulfide, comprising adjusting, during preparation of lithium sulfide, the particle size of raw materials and reaction conditions so as to minimize residual impurities in lithium sulfide, and improving the flow characteristics and aggregation characteristics of particles, thereby providing an excellent solid electrolyte raw material; and lithium sulfide.

The invention provides a preparation process and a preparation device of high-purity hydrogen sulfide, and relates to the technical field of hydrogen sulfide preparation, and the preparation process comprises the following steps: obtaining high-purity sulfur, adding the high-purity sulfur into a sulfur melting kettle, and melting to obtain liquid high-purity sulfur; hydrogen is prepared and heated; and feeding the liquid high-purity sulfur and the heated hydrogen into a reaction tower for reaction to prepare the high-purity hydrogen sulfide gas. According to the invention, hydrogen sulfide is prepared from high-purity sulfur and high-purity hydrogen, so that the generation of impurity gases can be reduced, and the purity of hydrogen sulfide gas is improved.