264results 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.

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.

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

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.

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 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.

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.

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.

A method comprising partially condensing and separating a feed stream comprising helium and hydrogen to produce a first medium-pressure vapor stream and a first medium-pressure liquid stream; reducing the pressure of the first medium-pressure liquid stream or a stream derived from the first medium-pressure liquid stream to produce a low-pressure vapor stream and a low-pressure liquid stream; cooling the first medium-pressure vapor stream by indirect heat exchange against the low-pressure liquid stream to produce a first partially condensed medium-pressure stream; and separating the first partially condensed medium-pressure stream to produce a second medium-pressure vapor stream and a second medium-pressure liquid stream.

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 gas stream is pressurized to produce a compressed gas stream. A first portion of a fuel stream is combusted in the presence of the compressed gas stream to produce an exhaust stream. The exhaust stream is flowed to a turbine of an electric generator, thereby causing the turbine to rotate and generate power. Heat is transferred from to the exhaust stream to the compressed gas stream. Heat is transferred from the exhaust stream to a working fluid. Heat is transferred from the working fluid to a water stream for generating a steam stream. A second portion of the fuel stream is converted in the presence of oxygen and steam to produce a syngas stream. The syngas stream is separated to produce a carbon dioxide stream and a hydrogen stream. The hydrogen stream is reacted with nitrogen to produce an ammonia stream.

The invention relates to the technical field of hydrocyanic acid production, in particular to a high-yield hydrocyanic acid chemical process which comprises the following steps: 1) respectively pretreating ammonia gas, natural gas and air, mixing according to a ratio, and inputting into a hydrocyanic acid reactor; (2) carrying out oxidation reaction on the raw material gas under a certain condition under the catalytic action of a platinum alloy net to prepare ammonia-containing hydrocyanic acid gas; 3) performing ammonia removal treatment on the hydrocyanic acid gas to obtain purified hydrocyanic acid gas and an ammonium sulfate solution containing cyanide; 4) carrying out cyanogen removal treatment on the ammonium sulfate solution to obtain mixed gas containing hydrocyanic acid and a cyanogen-free ammonium sulfate solution; according to the method, the area of a platinum alloy net capable of being contained is increased, the reaction area playing a catalytic role is increased, then the reaction efficiency is improved, and the single-line productivity is improved.

A phase-stabilized ammonium nitrate (PSAN) explosive is provided, comprising PSAN prills and a fuel. The PSAN prills contain ammonium nitrate, a potassium salt, and an inorganic porosity enhancer.

The invention discloses an advanced treatment method of manganese residue leachate, which comprises the following steps: mixing the manganese residue leachate and hydrogen peroxide, stirring, adjusting the pH value of the system to be greater than or equal to 11, adding carbonate for precipitation reaction, stirring, adding a flocculant for flocculation reaction, filtering, and sequentially performing ultrafiltration treatment, cyclic ammonia nitrogen removal treatment, cyclic absorption and evaporative crystallization on the filtrate, an ammonium sulfate product is obtained. Compared with a conventional method, the advanced treatment method for the manganese residue leachate can efficiently and thoroughly remove metal ions and ammonia nitrogen in the manganese residue leachate, meanwhile, an ammonium sulfate product with high purity can be obtained, the purity exceeds 98%, resource utilization of the ammonia nitrogen can be achieved, and the method is suitable for industrial production. The method has the advantages of simple process, low treatment cost, high treatment efficiency, good metal ion removal effect, high ammonia nitrogen recovery rate, high ammonium sulfate purity and the like, and is high in use value and good in application prospect.

The application belongs to the technical field of chemical materials, and specifically discloses a method for preparing lithium sulfide, which comprises the following steps: mixing and reacting lithium salt and ammonium sulfide to obtain lithium sulfide; wherein the lithium salt comprises at least one of lithium hexafluorophosphate, lithium difluorophosphate and lithium tetrafluoroborate. In the method for preparing lithium sulfide, the lithium salt and the ammonium sulfide can be fully reacted under mild conditions, the reaction time is short, the reaction yield is high, and the obtained lithium sulfide has high purity.

An active catalyst for ammonia synthesis is provided that is integrated in a composition or complex with a dedicated sorbent such that the catalyst portion and sorbent portion are in direct intimate contact, which overcomes the thermodynamic limits for conversion. The sorbent may include a metal halide absorbent, zeolite absorbent, other material absorbent or absorbent to capture ammonia in close molecular contact or near molecular contact with the catalyst in the production of ammonia, where the composition / complex may be provided in the form of a granular or pill structure. By removing the ammonia substantially while forming the ammonia, the forward reaction for producing the ammonia can continue with little attenuation, such that high net conversion is achieved in a single pass or accumulation within the segmented reactor while operating in series.

The invention relates to a comprehensive recovery method of acid waste liquid in a process of producing graphene oxide by a chemical method. The method comprises the following steps: filtering the acid waste liquid to remove impurities; the method comprises the following steps: introducing ammonia gas into the acidic waste liquid, controlling the adding amount of the ammonia gas, enabling the reaction temperature to be within a proper range by virtue of reaction heat generated in a reaction process, and enabling a reaction system to be still acidic, so that part of SO4 < 2-> ions in the acidic waste liquid react with NH3 to generate (NH4) 2SO4, and the residual SO4 < 2-> is combined with Mn < 2 + > ions to form a MnSO4 supersaturated solution which is completely separated out in a salt form; filtering while the solution is hot to obtain a MnSO4 crystal substance and a potassium ammonium sulfate solution; introducing ammonia gas into the ammonium potassium sulfate solution to obtain a mixed solution; and carrying out reduced pressure distillation on the mixed solution to obtain a solid which is the ammonium potassium sulfate compound. The method has the beneficial effects that the resource utilization benefit of each element in the acid waste liquid is maximized, and the production cost of ammonium sulfate potassium compound fertilizer and graphene oxide is reduced.

A resource treatment method for the flue gas desulfurization wastewater of fluid catalytic cracking, belonging to the technical field of wastewater treatment. The treatment method of the present invention for the flue gas desulfurization wastewater of fluid catalytic cracking includes steps such as aeration oxidation, carbon dioxide neutralization reaction, flocculation precipitation, evaporation concentration, double decomposition reaction, concentration separation, centrifugal separation, evaporation in an ammonia stripping tower, concentration in an evaporation kettle, and centrifugal separation. The present invention prepares sodium bicarbonate that can be recycled for desulfurization through a double decomposition reaction with the sodium sulfate in the flue gas desulfurization wastewater of fluid catalytic cracking, and the by-product is ammonium sulfate, which is used as a fertilizer; the products are sodium bicarbonate and ammonium sulfate with economic value, truly realizing a closed-loop of resource utilization from "waste" to "product"; no new "three wastes" such as waste residue, waste gas, and wastewater are generated, achieving zero discharge of wastewater in the entire desulfurization system; reducing the treatment cost; completely solving the problem of the disposal of the flue gas desulfurization wastewater of fluid catalytic cracking.

The application discloses a method for preparing liquid HCN by an ammonia oxidation method and a reaction gas absorption system, and the preparation process is as follows: reaction gas is introduced into an absorption device to realize total absorption of HCN, NH3 and H2O, then the absorption rich solution is sent into a rectification device to realize resolution and rectification, liquid HCN and absorption lean solution are obtained, the liquid HCN is recovered, and part of the absorption lean solution is returned and mixed with sulfuric acid to form a sulfuric acid-containing solution. Compared with the existing process, the process method of the application realizes total absorption in one step, then liquid HCN is obtained by rectification, the process flow is short, the equipment is less, the investment is lower, the operation is more stable and safe, and the total energy consumption is lower.

A catalytic reactor comprising include a housing coupled with a feedstock source to receive a flow of ammonia in gaseous form that can flow through the catalytic reactor. The housing further comprises