342results about "Ammonia compounds" patented technology

The present application relates to waste gas treatment technical field, specifically for a kind of foul smell tail gas treatment device for disposal of sick and dead animals, including the spray tower being arranged on rack, filter mechanism for purifying spray water being arranged inside the spray tower and flushing mechanism for washing filler ball being arranged on the rack, the spray tower includes the tower shell assembly being arranged on the rack, spray assembly being arranged inside the tower shell assembly and filling assembly for dynamically distributing filler ball being arranged inside the tower shell assembly;The present application can dynamically layout filler ball, change the flow path of tail gas upwards, increase the residence time of tail gas, increase the reaction contact surface of filler ball and tail gas, ensure that tail gas can fully react with spray water, improve the purification efficiency of tail gas, solve the technical problem that hollow ball filler in the interior of traditional spray tower is static placed, leading to lower tail gas purification efficiency.

The invention provides a method for preparing sodium carbonate and co-producing ammonium sulfate from sodium sulfate waste salt, and relates to the technical field of chemical engineering. The method comprises the following steps: mixing sodium sulfate waste salt with water for dissolution, mixing the obtained sodium sulfate waste salt solution with an impurity removal agent for impurity removal, and mixing the obtained impurity removal solution with ammonium bicarbonate for double decomposition reaction to obtain a reaction feed liquid; carrying out primary cold separation on the reaction feed liquid to obtain first filtrate and primary sodium bicarbonate; sequentially washing, drying and roasting the primary sodium bicarbonate to obtain a sodium carbonate product; carrying out secondary cold separation on the first filtrate, carrying out solid-liquid separation to obtain a second filtrate and mixed salt, and reusing the mixed salt in the metathesis reaction; and mixing the second filtrate with an acid adjusting agent to adjust the acid, and carrying out evaporative crystallization on the obtained solution to obtain an ammonium sulfate product and an evaporation mother solution. Industrial-grade sodium carbonate and ammonium sulfate are co-produced by using sodium sulfate waste salt, sodium carbonate and ammonium sulfate meet national standard requirements, and the recovery rate of sodium sulfate is greater than or equal to 90%.

The present invention relates to an ammonia decomposition catalyst and a manufacturing method thereof, and more particularly to an ammonia decomposition catalyst containing alumina (Al2O3), cerium (Ce), lanthanum (La), ruthenium (Ru) and potassium (K).

The invention discloses a method for realizing pollution reduction and carbon reduction by phosphogypsum recycling. The method comprises the following steps: (1) washing phosphogypsum with water to remove soluble impurities, neutralizing residual acid, and calcining and activating; (2) pretreatment of the landfill leachate: magnesium salt and phosphate are added, the pH of the landfill leachate is adjusted, and free ammonia NH3 is released through low-temperature heating; (3) the pretreated landfill leachate is sprayed to capture CO2 in the flue gas, and a (NH4) 2CO3 solution is obtained; (4) fully mixing a (NH4) 2CO3 solution with the pretreated ardealite, and controlling the reaction conditions in a closed reactor, so that the ardealite and (NH4) 2CO3 are subjected to a heterogeneous reaction to generate CaCO3 and (NH4) 2SO4; and (5) product purification: carrying out solid-liquid separation on the mixed solution by adopting a multi-stage crystallization process to obtain a building material, and carrying out gradient cooling and recrystallization purification on the filtrate to obtain the nitrogen fertilizer. According to the method, recycling of the landfill leachate and the ardealite is achieved, and CO2 in the flue gas is efficiently removed.

Provided is a vehicle windowpane which can realize a vehicle space which is good for the skin of an occupant of the vehicle. This vehicle windowpane has an average transmittance A of 65% or less in a near-infrared wavelength range of 780-2500 nm, and if the average transmittance in a visible light wavelength range of 650-750 nm is denoted by b1 and the average transmittance in the entire visible wavelength range of 380-780 nm is denoted by b2, then a value B that is the percentage of b1 relative to b2 (b1 / b2×100) is 50% or more, and a minimum transmittance value occurs within a wavelength range of 500-600 nm.

The system comprises a mixed gas pipeline, a heat exchanger a, a heat exchanger b, a heat exchanger c and a multi-stage refrigerating unit, the heat exchanger a, the heat exchanger b and the heat exchanger c are sequentially connected in series, the multi-stage refrigerating unit feeds cold media into the heat exchanger a, the heat exchanger b and the heat exchanger c for heat exchange, and the mixed gas pipeline is communicated with the heat exchanger a; and the output ends of the heat exchanger a, the heat exchanger b and the heat exchanger c are respectively provided with a gas-liquid separation tank a, a gas-liquid separation tank b and a gas-liquid separation tank c. According to the system and the method for separating and purifying the ammonium sulfate in the electrolytic manganese residues, gaseous sulfuric acid, sulfur dioxide, ammonia gas and nitrogen in mixed gas are respectively condensed and gradually recovered by utilizing the characteristic that the boiling points of the gaseous sulfuric acid, the sulfur dioxide, the ammonia gas and the nitrogen are different, components are used for recovering the ammonium sulfate and the nitrogen, and the sulfur dioxide is separated out; the ammonium sulfate recovery efficiency reduction caused by sulfur dioxide influence is avoided.

The invention belongs to the technical field of chemical engineering and secondary resource utilization, and particularly discloses a collaborative utilization process of sodium sulfate and ammonium-containing waste salt. The high-value utilization method of sodium sulfate provided by the invention comprises the following steps: mixing sodium sulfate, organic ammonium salt and sulfuric acid, and adding water to prepare a mixed solution; extracting the mixed solution by using an extracting agent, and separating a water phase from an organic phase; adding a pH regulator into the water phase to regulate the pH to alkalescence, introducing carbon dioxide gas to fully react, cooling, crystallizing, and filtering to obtain filtrate and sodium bicarbonate precipitate; heating the filtrate for evaporative crystallization to obtain ammonium sulfate; and recovering the organic acid in the organic phase. The invention provides a subversive solution for sodium sulfate by-product accumulation and ammonium-containing wastewater treatment, has double values of resource circulation and carbon emission reduction, and has the advantages of full-flow closed-loop design, wide applicability, high product purity and high economical efficiency in process.

The invention relates to the technical field of ammonia desulfurization, and in particular to an integrated device for promoting crystal growth, comprising a desulfurization crystallization tower, a steam generator is arranged on one side outer wall of the desulfurization crystallization tower, a steam transmission end of the steam generator is connected to a first steam transmission pipe, and one end of the first steam transmission pipe runs through the interior of the desulfurization crystallization tower, a discharge port is through-connected on the bottom outer wall of the desulfurization crystallization tower, and a slurry crystallization tank is arranged on one side outer wall of the desulfurization crystallization tower; in the ammonia desulfurization process of the invention, the waste gas is desulfurized in the desulfurization tower, and the solution is concentrated and concentrated in the desulfurization tower by using high-temperature steam as a heat source, so that the slurry in the desulfurization tower is crystallized and precipitated; in the process, a feed pump is operated to pump the slurry with fine crystals in the desulfurization tower into the slurry crystallization tank, and the fine crystal slurry is crystallized by separating a part of the solvent in the slurry crystallization tank in combination with slow stirring, thereby increasing the crystallization; the crystallization inside the tower and outside the tower are combined to effectively increase the crystallization.

Provided herein are systems and methods for producing hydrogen and ammonia. Hydrogen is produced in an anion exchange membrane-based electrochemical stack. The hydrogen produced in the stack may be used to produce ammonia or for other applications requiring hydrogen. The feedstock for the anion exchange membrane-based electrochemical stack may be salt water, such as seawater. A desalination module or chlor-alkali stack may be used to treat the salt water prior to electrolysis in the anion exchange membrane-based electrochemical stack.

To provide a method of preparing a catalyst for ammonia decomposition with enhanced dispersibility.SOLUTION: According to the embodiments of the present disclosure, an ammonia decomposition catalyst may be prepared by performing heat treatment on alumina, a lanthanum compound and a cerium compound in a reducing gas atmosphere to form a composite oxide on an alumina support, and supporting an active metal including ruthenium on the composite oxide.SELECTED DRAWING: Figure 1

Hydrogen may be produced from ammonia by catalytic reaction. For example, a method of hydrogen production may include: introducing ammonia to a reactor, wherein the reactor includes therein a catalyst, wherein the catalyst includes a high entropy alloy, and wherein the high entropy alloy has an entropy, S, such that S ≥ 11.31 J K-1 mol-1; reacting the ammonia in the presence of the catalyst to form hydrogen gas and nitrogen gas; and separating the hydrogen gas from the nitrogen gas to produce a hydrogen stream including the hydrogen gas from the reactor.

The invention belongs to the technical field of chemical materials, and particularly discloses a method for preparing lithium sulfide, which comprises the following steps: mixing lithium salt and ammonium sulfide for reaction to obtain lithium sulfide; wherein the lithium salt comprises at least one of lithium hexafluorophosphate, lithium difluorophosphate and lithium tetrafluoroborate. According to the method for preparing the lithium sulfide, the lithium salt and the ammonium sulfide can fully react under the mild condition, the reaction time is short, the reaction yield is high, and meanwhile the purity of the obtained lithium sulfide is high.

The application discloses a kind of water-soluble sulphur-based compound fertilizer preparation method, belong to compound fertilizer technical field.The steps include as follows:(1) in reaction kettle, concentrated sulfuric acid and potassium chloride are reacted under heating condition, reaction temperature is 105-115 DEG C, reaction time is 25-45 minutes, slurry is sent to cooling kettle;(2) in cooling kettle, temperature is reduced to 40-60 DEG C, slurry is sent to mixed acid tank;(3) in mixed acid tank, add dilute phosphoric acid, potassium bisulfate solution and slurry, reaction temperature is 65-75 DEG C, slurry is sent to tubular reactor;(4) in tubular reactor, add ammonia, washing liquid and slurry, reaction temperature is 150-180 DEG C, slurry is sent to granulator;(5) in granulator, add alkaline compound fertilizer raw material, return material and slurry for granulation, granulation temperature is 80-95 DEG C, return material ratio is 1:1.5-2.0;(6) the granules obtained from granulator are cooled and screened to obtain product.

A method (100) for producing a synthesis product (6) is proposed, in which gaseous hydrogen (3) is provided by electrolysis (10) of water (1) and is subjected to a reaction (30) with one or more gaseous reactants (4) to form the synthesis product (6), wherein during a first process mode the hydrogen (3) and the one or more reactants (4) are mixed to obtain a reaction mixture (5), and the reaction mixture (5) or a portion thereof is stored under pressure in a storage unit (20), and wherein during a second process mode the reaction mixture (5) stored under pressure in the first process mode or a portion thereof is removed from the storage unit (20) and fed to the reaction (30) to form the synthesis product (6). A corresponding system is also proposed.

The invention discloses a method and a device for preparing calcium carbonate and ammonium sulfate by capturing CO2 through desulfurization gypsum. The method for preparing calcium carbonate and ammonium sulfate by capturing CO2 with desulfurized gypsum comprises the following steps: preparing a desulfurized gypsum turbid liquid, and reacting the desulfurized gypsum turbid liquid with a phase inversion agent to obtain a calcium-rich leachate; performing mineralization reaction on the calcium-rich leachate and CO2 to obtain a calcium carbonate solid phase and a first liquid phase; carrying out precipitation reaction on the first liquid phase and a precipitator to obtain sulfate precipitate and a second liquid phase; and reacting the sulfate precipitate with ammonia water to obtain a third liquid phase and a solid phase, and crystallizing the third liquid phase to obtain ammonium sulfate crystals. The desulfurized gypsum can be converted into high-purity calcium carbonate and ammonium sulfate, and the problems of stockpiling of the desulfurized gypsum and low purity of calcium carbonate are effectively solved. Meanwhile, mild process parameters are adopted, and the reaction is carried out under the conditions of normal pressure and medium and low temperature; and the phase inversion agent, the precipitator and the water can be recycled, so that the cost is remarkably reduced.

The invention relates to the field of chemical application, and discloses a device for preparing large-particle ammonium sulfate crystals through reduced-speed crystallization. Comprising a neutralization reactor, a settling separation tank, a pre-crystallization solution tank, a first-stage intermittent jacket crystallizer, a second-stage intermittent jacket crystallizer, a filter powder sieving device, an ammoximation tert-butyl alcohol tower reboiler, a heat exchanger group, a stirrer group and a centrifugal pump group, wherein the centrifugal pump group consists of a centrifugal pump I, a centrifugal pump II, a centrifugal pump III, a centrifugal pump IV and a centrifugal pump V; the invention further discloses a process for preparing the large-particle ammonium sulfate crystals through speed-reducing crystallization. The process comprises the following steps: adding rearrangement liquid from a caprolactam rearrangement system and gas ammonia into the neutralization reactor through an external circulation pipeline. By fully utilizing heat in a neutralization reaction and crystallization process and combining with a compound additive, a seed crystal and a speed reduction crystallization technology, an efficient two-stage series crystallization mode is realized, the generation of large-particle ammonium sulfate crystals is promoted, the crystal quality is optimized, the energy consumption is reduced and the production efficiency is improved.

The utility model discloses ammonia nitrogen removal equipment for anaerobic fermentation biogas slurry, and belongs to the field of ammonia nitrogen removal and recycling of anaerobic fermentation biogas slurry. All deaminated biogas slurry flows back to the anaerobic fermentation system by virtue of a steam stripping flash evaporation deamination technology, an ammonia absorption technology, an evaporative crystallization technology, a mud-mud heat exchange technology and the like. An adopted flash evaporation deamination tower (3) is internally divided into a plurality of areas, ammonia-containing biogas slurry sequentially flows through the areas and is in countercurrent contact with circulating steam and fresh steam in the areas, ammonia nitrogen in the biogas slurry is removed through steam stripping and flash evaporation, and the generated deaminated biogas slurry completely flows back to an anaerobic fermentation system; ammonia in the ammonia-containing steam is absorbed by dilute sulfuric acid in an ammonia gas absorption tower (9), an ammonium sulfate solution is generated and sent to an evaporative crystallization tank (16), indirect heating and circulating evaporative crystallization are adopted, and solid ammonium sulfate is transported outwards; the mud-mud heat exchanger (2) is suitable for heat exchange between non-Newtonian fluid materials. Biogas slurry is no longer discharged, and fixed asset investment of anaerobic fermentation projects with the same gas production scale is reduced.

An apparatus and process for the activation of catalyst material utilized in ammonia cracking can include an initial use of hydrogen and heat to perform an initial stage of catalyst activation and a subsequent use of ammonia and heat to perform a subsequent state of catalyst activation. The subsequent use of ammonia can be configured so that different catalytic material at different plant elements are activated in a pre-selected sequence to provide activation of the catalytic material utilized in different plant elements. Some embodiments can be configured to avoid excess temperatures that can be detrimental to equipment that can be positioned upstream of a furnace in some embodiments while also avoiding sintering of the catalytic material.

An apparatus and process for the activation of catalyst material utilized in ammonia cracking can include an initial use of hydrogen and heat to perform an initial stage of catalyst activation and a subsequent use of ammonia and heat to perform a subsequent state of catalyst activation. The subsequent use of ammonia can be configured so that different catalytic material at different plant elements are activated in a pre-selected sequence to provide activation of the catalytic material utilized in different plant elements. Some embodiments can be configured to avoid excess temperatures that can be detrimental to equipment that can be positioned upstream of a furnace in some embodiments while also avoiding sintering of the catalytic material.

The invention discloses an ammonia nitrogen treatment system and method for coke oven gas direct reduction factory wastewater. Comprising an aeration tank, an inclined tube sedimentation tank, a dosing device, a buffer water tank, a quartz sand filter, a middle water tank, a mixer, a liquid caustic soda storage tank, a deamination tower kettle, a discharged pH regulating tank, a sulfuric acid storage tank, an ammonium sulfate circulating tank, an aeration fan, an air stripping fan, a gas buffer bag, an ammonium sulfate circulating pump and a sulfuric acid pump, an ammonia-nitrogen-containing wastewater pipeline is sequentially communicated with an aeration tank and an inclined tube sedimentation tank, an overflow port of the inclined tube sedimentation tank is communicated with a water inlet of a buffer water tank, and a water outlet of the buffer water tank is sequentially communicated with a quartz sand filter, a middle water tank, a mixer and a deamination tower kettle; the aeration fan is communicated with an air inlet of the aeration box, the dosing device is communicated with a dosing port of the inclined tube sedimentation tank, and the liquid caustic soda storage tank is communicated with a caustic soda inlet of the mixer. After the system and the method are adopted for treatment, the ammonia nitrogen of the effluent stably reaches the standard, the pH value is stable, and the effluent meets the first-level wastewater discharge standard of the national Integrated Wastewater Discharge Standard.

The present invention relates, in general, to a system and method for sequentially energizing heating elements in an electric catalyst unit for ammonia dissociation on-board a vehicle. The present invention utilizes output temperature readings at various sections within the electric catalyst unit, and sequentially energizes corresponding heating elements only if the output temperature of an upstream section is below a threshold temperature required for ammonia dissociation to occur. By sequentially energizing heating elements as needed, versus fully energizing every heating element, the present invention mitigates the risk of degradation and failure of the vehicle power system and other electrical components in the vehicle.

The utility model relates to a reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas, which comprises a reactor body, the reactor body sequentially comprises an absorption area and a crystallization area from top to bottom, and the crystallization area is communicated with the absorption area; a tail gas outlet is formed in the top end of the absorption area, and a crystal mush outlet is formed in the bottom end of the crystallization area; an ammonia-containing waste gas inlet is formed in the absorption area, the ammonia-containing waste gas inlet is downwards inclined relative to the reactor body, and the downwards inclined angle between the ammonia-containing waste gas inlet and the reactor body is 5-30 degrees. The reactor for preparing ammonium sulfate through resource recovery of ammonia-containing waste gas is high in integration level and small in size, realizes separation of an absorption area and a crystallization area in a single reactor, realizes resource recovery of high-concentration ammonia-containing waste gas into ammonium sulfate, improves the quality of ammonium sulfate products, is high in ammonia recovery rate, solves the problem of blockage of a solid-containing and crystal-containing reactor, and is suitable for industrial production. No waste gas, waste liquid or waste solid is discharged in the treatment process, and long-period stable operation of the device is realized.

An apparatus is provided including a discharge zone configured to accept a gas flow therethrough, a high voltage electrode capable of generating a high voltage discharge within the discharge zone, and an electrolysis zone bounded by a second electrode and a third electrode. In the apparatus, the second and third electrodes are low voltage electrodes, and the second electrode is gas permeable and separates the electrolysis zone from the discharge zone.

The utility model discloses a water-based silicon dioxide preparation device with a solvent recovery function, which comprises a first reaction kettle, a vacuum generator and a condenser, and further comprises a second reaction kettle and a methanol collection tank, a gas inlet end and a liquid outlet end of the condenser are respectively connected with a gas outlet of the first reaction kettle and a liquid inlet of the second reaction kettle, a gas outlet end and a liquid inlet end of the condenser are respectively connected with a methanol collecting tank and a liquid outlet of the second reaction kettle, and the methanol collecting tank is connected with a gas return port of the first reaction kettle; and the second reaction kettle is provided with a sulfuric acid feeding hole and a second heat medium inlet. The methanol solvent can be recycled in real time, so that the raw material cost is reduced, no waste liquid is generated in the preparation process, the waste liquid treatment procedure is omitted, and the process cost is saved.

A system and method for generating aqueous ammonia of variable concentration from water and any existing anhydrous ammonia source. The system is modular and safe, can be powered by almost any electrical source, can produce varying volumes of output aqueous ammonia without a prohibitive loss of efficiency, and can produce varying concentrations of output solution.

Methods and systems for synthesis using an underwater electric arc. Such methods and systems form an electrical arc between an anode and a cathode positioned under water or within an aqueous mist and introduce an added material into the vicinity of the electrical arc. The formation of the electrical arc in the vicinity of the added material facilitates synthesis of chemical products from the added material. Such synthesized chemical products include ammonia, hydrogen, cyanide, and hydrogen cyanide.

A catalyst includes a catalyst particle including a first metal atom and an active site group attached to the first metal atom via one or more oxygen bridges. The active site group comprises a boric acid group, a metal hydroxide group or a metal oxide group. The metal hydroxide group includes a second metal atom or beryllium, and the metal oxide group includes a second metal atom. The second metal atom is different from the first metal atom and includes aluminum, gallium, indium, or bismuth.

The invention relates to the field of sewage treatment reagents, in particular to a composite alkaline carbon source for sewage treatment and a preparation method thereof.The preparation method comprises the following steps that S1, magnetic microwave pretreatment and magnetic powder recovery are conducted, and pretreated sludge is obtained; s2, performing alkaline fermentation to obtain a fermentation product; s3, carrying out solid-liquid separation and deep removal of nutritive salt to obtain a suspension; s4, refining the fermentation liquor to obtain an alkaline carbon source crude product; and S5, compounding and curing the carbon source to obtain the composite alkaline carbon source. The composite alkaline carbon source for sewage treatment is prepared, a traditional combination of sodium acetate and sodium carbonate is replaced, solid waste utilization is achieved, and the proportion of nitrogen, phosphorus and heavy metal elements is small.

This utility model relates to an anti-clogging reactor for the resource recovery and preparation of ammonium sulfate from high-concentration ammonia-containing waste gas. The reactor body includes an absorption zone and a crystallization zone from top to bottom, with the crystallization zone and the absorption zone connected. The absorption zone is located above the liquid surface, and the crystallization zone is located below the liquid surface. The top of the absorption zone has a tail gas outlet, and the bottom of the crystallization zone has a crystal slurry outlet. An external Venturi reaction zone is located below the absorption zone of the reactor body, connected to the reactor body. The Venturi reaction zone has an inlet for the ammonia-containing waste gas and an inlet for the circulating absorbent liquid. The external Venturi reaction zone forms a primary absorption, reducing the intensity of the absorption reaction within the reactor and significantly improving the anti-clogging capability.

The present invention relates to a method for transferring heat to a stream comprising NH3, the method comprising the steps of: (i) providing a stream comprising a heat transfer medium; the stream having a pressure in the range of 1 to 100 bar (abs) and a temperature of 105°C or greater; (ii) increasing the temperature of the stream provided in (i) by transferring heat from a chemical conversion process, a physicochemical process, or ambient heat, or a combination of two or more thereof, to a heat transfer medium to obtain a stream having a temperature in the range of 125 to 750°C; (iii) increasing the pressure of the flow obtained in (ii); obtaining a compressed stream having a temperature in the range of 50 to 800°C; (iv) providing a stream comprising NH3, wherein the NH3-comprising stream has a temperature in the range of -33 to 100°C; (v) heating the stream provided in (iv), wherein the heating comprises transferring heat from the compressed stream obtained in (iii) to the stream provided in (iv) to obtain a heated NH3-containing stream having a temperature in the range of 25 to 750°C; (vi) expanding the compressed stream obtained in (v); (vii) optionally recycling at least a portion of the stream obtained in (vi) to (i). Includes.