522results about "Carbonate preparation" patented technology

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 utility model discloses an atomization rotational flow crystallization device for CO2 resource recovery, which relates to the technical field of recovery of CO2 in combustion flue gas and comprises a spray gas inlet device, a spherical cyclone and a condensation crystallization device. According to the utility model, the atomization rotational flow crystallization device is adopted to realize CO2 resource recovery of flue gas, the flue gas is firstly in full contact with atomization absorption liquid sprayed by the multi-point spraying array assembly to form a flue gas absorption liquid mixture, the flue gas absorption liquid mixture is in a rotational flow state after entering the spherical hydrocyclone, and gas-liquid phase separation is carried out, so that the CO2 resource recovery is realized. The liquid phase is condensed under the condensation action of the condensation crystallization device to obtain a solid-phase product sodium bicarbonate and a liquid-phase absorption liquid, and the liquid-phase absorption liquid is subjected to temperature control adjustment and atomization again to provide an absorption liquid for the multi-point spray array assembly; and the method can also be used for large-scale CO2 resource recovery scenes such as thermal power plants and the like, the process and equipment are stable and reliable, the operation is flexible, and the CO2 absorption conversion rate is high.

Plant for electrically producing sodium carbonate or bicarbonate Plant for electrically producing sodium carbonate (Na2CO3) comprising: (A) an electrodialyzer cellstack to electrodialyze a sodium chloride (NaCl) aqueous solution into a sodium hydroxide (NaOH) solution and into a hydrochloric acid (HCl) solution, wherein the electrodialyzer cellstack is operated in at least 2 production rates on a given time period; (B) carbonating mean(s) to partially or totally carbonate the NaOH solution with CO2 into a Na2CO3 solution; (C) storage mean(s) of the NaOH solution or of the Na2CO3 solution; (D) a crystallizer equipment to concentrate Na2CO3 solution and to produce Na2CO3 crystals and a mother liquor; and wherein the storage means of the NaOH solution, or of the Na2CO3 solution, is of a volume sufficient to operate the crystallizer equipment in a constant production rate in the said time period.

The invention belongs to the field of chemical production, and provides a green and energy-saving preparation method of high-purity anhydrous aluminum trichloride, which comprises the following steps: S1, weighing and mixing: weighing an aluminum oxide raw material and a carbon source according to a ratio, uniformly mixing to form a mixed raw material, and conveying the mixed raw material to a fluidized bed furnace; the purity of the aluminum oxide raw material meets the following conditions: Al2O3 is not less than 75%; the carbon source and the alumina raw material are consistent in particle size distribution; s2, gas preheating; s3, boiling reaction; s4, impurity removal: high-temperature flue gas at the top of the fluidized bed furnace is subjected to dust removal through a cyclone separator and then enters an impurity remover; the high-temperature flue gas after impurity removal is further cooled to 260-400 DEG C and then enters a high-temperature filter to be filtered; s5, crystallization: the flue gas filtered by the high-temperature filter enters a continuous crystallizer; s6, tail gas treatment: washing and drying the tail gas at the outlet of the continuous crystallizer and then combusting as a heat source of the heat exchanger in the step S2; and combusted tail gas enters an alkali liquor absorption tower to be absorbed and recycled. According to the method disclosed by the invention, the high-purity anhydrous aluminum trichloride can be prepared with low cost, low energy consumption and high yield.

The invention relates to preparation of sodium bicarbonate co-production ammonium sulfate, in particular to a method and a system for preparing sodium bicarbonate co-production ammonium sulfate from low-temperature mirabilite, and aims to overcome the defects that high-purity ammonium sulfate cannot be obtained or the technical route of twice freezing-high-temperature ammonia distillation is high in energy consumption and large in industrialization difficulty in the prior art. The method for preparing sodium bicarbonate and co-producing ammonium sulfate from mirabilite at low temperature comprises the steps of preparing sodium bicarbonate, preparing ammonium sodium solid salt, acidifying and crystallizing the ammonium sodium solid salt, cooling and crystallizing, and preparing ammonium sulfate, and the sodium sulfate and the ammonium sodium solid salt are removed to obtain a high-purity sodium bicarbonate product and an ammonium sulfate product. In the system for preparing sodium bicarbonate and co-producing ammonium sulfate from mirabilite at low temperature, a plurality of evaporation devices and recycling pipelines among the evaporation devices are reasonably arranged, so that full utilization and recovery of products in each step are realized.

Methods of capturing carbon in biochar are provided. The method includes mixing the biochar with an alkaline solution to form an intermediate mixture, and exposing the intermediate mixture to a CO2 source to precipitate calcium carbonate over and in the biochar to form a CO2 weathered biochar. In some cases, the method further includes injecting CO2 into the alkaline wastewater to sequestration / store CO2, which may then be used as mixed water for the production of cementitious composites. The method can be used for upgrading three waste streams, and the treated CO2 weathered biochar maintains the compressive strength of the obtained concrete when replacing part of the pre-cured cement and aggregate components. In addition, the treated CO2-weathered recycled aggregate maintains the mechanical strength of the obtained concrete when replacing part of the aggregate.

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 present invention relates to systems and processes for utilizing produced water and captured carbon dioxide to produce high-value products. The system includes a produced water processing system, a carbon capture system, an electrolyzer, and a conversion chamber. The electrolyzer includes a first chamber, a second chamber, and a semi-permeable membrane and first electrode in the first chamber and a second electrode in the second chamber. The first chamber receives treated saturated produced water. The second chamber is operated at a second operating pressure that is less than the first operating pressure and facilitates the passage of sodium ions across the membrane. A current is applied to the electrodes such that the first electrode functions as an anode and the second electrode functions as a cathode, producing hydrogen gas and sodium hydroxide in the second chamber and chlorine gas in the first chamber. The polarity of the electrodes and the flow of reagents into the first and second chambers and the flow of products out of the first and second chambers may be reversed.

The subject process relates generally to producing an aqueous solution through a simple but highly effective chemical reaction. The aqueous solution is composed of a blended solution with water and an added solubilizer for the chemical reaction. The results produce an ionic solid and an alkaline liquid solution which are useful commercial products, and various applications including but not limited to use as a CO2 capture solvent.

Plant for electrically producing sodium carbonate (Na2CO3) comprising: (A) a set of at least two electrodialyzer cellstacks to electrodialyze a sodium chloride (NaCl) solution into a sodium hydroxide (NaOH) solution and into a hydrochloric acid (HCI), wherein the electrodialyzer cellstack set is operated in at least 2 production rates on a given time period; (B) carbonating mean(s) to partially or totally carbonate the NaOH solution with CO2 into Na2CO3 solution; (C) storage mean(s) of the NaOH solution or of the Na2CO3 solution; (D) a crystallizer equipment to concentrate the Na2CO3 solution and to produce sodium carbonate Na2CO3 crystals and a mother liquor; (E) separation mean(s) to separate the Na2CO3 crystals from their mother liquor and recovering the Na2CO3 crystals; and wherein the storage means of the NaOH solution, or of the Na2CO3 solution, is of a volume sufficient to operate the crystallizer equipment in a constant production rate in the said time period.

The invention provides a membrane-method carbon capture and solidification method. The membrane-method carbon capture and solidification method comprises a multivalent separation electrodialysis system, a cationic resin column, a bipolar membrane electrodialysis system, a carbon dioxide membrane enrichment device, an absorption tower, a pregnant solution pump, a desorption tower and four-compartment replacement electrodialysis. Alkali produced by bipolar membrane electrodialysis is used as absorption liquid, and acid produced by bipolar membrane electrodialysis is used as desorption liquid. According to the invention, the use cost of the adsorbent and the desorption agent is reduced, the internal balance of the agent system is realized, and meanwhile, the preparation of high-purity potassium bicarbonate can be realized by combining with four-compartment replacement electrodialysis. The system can be used for capturing and purifying carbon dioxide in atmosphere or industrial production and refining a potassium bicarbonate product, and compared with traditional carbon capture, absorption liquid and desorption liquid in the system can achieve circulation in the system, and zero emission is achieved.

The invention belongs to the technical field of sodium bicarbonate preparation, and particularly relates to a method for preparing sodium bicarbonate through sodium waste salt resource conversion. In order to solve the problems of low yield and low purity of sodium bicarbonate, sodium chloride, sodium sulfate or a mixed salt of sodium chloride and sodium sulfate is used as a raw material and is subjected to double decomposition reaction with ammonium bicarbonate. After the reaction is finished, a sodium bicarbonate crude product and mother liquor are obtained through solid-liquid separation, sodium bicarbonate precipitation of the mother liquor is further promoted by adding a salting-out agent into the mother liquor, then the yield of sodium bicarbonate is increased, the used salting-out agent can be recycled, and the purity of the sodium bicarbonate product is improved in a washing mode. According to the method for improving the yield and purity of sodium bicarbonate prepared from sodium chloride / sodium sulfate, a feasible scheme is provided for resource utilization of industrial waste salt and high-salt wastewater.

The following relates generally to systems and methods for using chemical reactions, electrodialysis of cation-containing brines, such as NaCl and biogenic carbon dioxide sources, such as seawater, to create net-zero cation carbonates, such as soda ash, and / or carbon dioxide gas with an acid such as HC1 as byproduct for sales and / or further use.

Disclosed are a carbon dioxide capturing method and a carbon dioxide capturing system for co-producing of carbon monoxide and hydrogen. The method includes: capturing, by an alkaline solution, carbon dioxide in a target component, to obtain an aqueous solution containing a carbonate; performing, on the aqueous solution containing the carbonate, a first electrolytic process, to obtain a first aqueous solution containing a bicarbonate and hydrogen; and performing, on the first aqueous solution containing the bicarbonate in the presence of a catalyst, a second electrolytic process, to obtain the carbon monoxide and the hydrogen, where the catalyst is selected as at least one component from a group consisting of an elementary substance of metal, alloy and compound of group VIII, group IB, group IIB, group IVA and lanthanide.

The invention discloses a method for regenerating and recycling baking soda desulfurized fly ash resources. The method comprises the following steps: S1, performing pretreatment and impurity removal on baking soda desulfurized fly ash to obtain a sodium sulfate solution; s2, adding the ammonium bicarbonate solution into the sodium sulfate solution, and performing double decomposition reaction to obtain sodium bicarbonate and residual mother liquor; s3, heating the residual mother liquor to decompose ammonium bicarbonate into carbon dioxide and ammonia gas, and performing evaporative crystallization on the residual mother liquor to obtain ammonium sulfate and sodium sulfate. The baking soda desulfurized fly ash is used as a raw material, baking soda is prepared through pretreatment impurity removal and double decomposition reaction, resource utilization of the baking soda desulfurized fly ash is achieved, the process is pure, and no new solid waste is generated.

Disclosed are a method and a system for capturing and utilizing carbon dioxide. The method for capturing and utilizing the carbon dioxide includes: performing a capture process on carbon dioxide in a target component by using an alkaline solution, to obtain an aqueous solution containing a carbonate; performing an electrolytic regeneration process on the aqueous solution containing the carbonate, to obtain an aqueous solution of a hydroxide, carbon dioxide produced by electrolysis, oxygen and hydrogen; and performing a catalytic reaction of the carbon dioxide produced by the electrolysis and the hydrogen, to obtain a hydrocarbon.

The invention belongs to the technical field of industrial waste treatment, and particularly relates to an integrated comprehensive treatment method for waste salt and carbon dioxide in the steel industry, which comprises the following steps: collecting industrial waste brine generated by a steel mill, and then carrying out treatment steps of pretreatment and sodium salt extraction to obtain a sodium salt solution with the COD value lower than 10mg / L; introducing the coked residual ammonia water into the treated carbon dioxide flue gas of the hot blast stove to obtain an ammonium bicarbonate-containing solution; introducing the sodium salt solution and the ammonium bicarbonate-containing solution into an electrodialysis module for ion exchange to generate a sodium bicarbonate dilute solution and an ammonium salt dilute solution; concentrating the sodium bicarbonate dilute solution by adopting a reverse osmosis system to obtain a sodium bicarbonate concentrated solution; and carrying out calcium and magnesium removal treatment on the sodium bicarbonate concentrated solution, heating the treated sodium bicarbonate concentrated solution to 190-270 DEG C through a heating tank, and then introducing the carbon dioxide flue gas of the hot blast stove again to obtain a sodium bicarbonate solid product with the purity greater than or equal to 98.5%. Organic combination of carnallite recycling and carbon dioxide adsorption and utilization is realized, and economic benefits and environmental benefits are improved.

The utility model discloses a system for producing sodium carbonate by using carbon dioxide and carbide slag in boiler flue gas, which is characterized in that the boiler flue gas discharged by a coal-fired boiler is purified and then enters a carbonization tower instead of part of lime kiln gas to react with ammoniacal salt water to generate NaHCO3, the NaHCO3 is calcined to generate a final product sodium carbonate, carbon is fixed to the final product, and the emission of CO2 is reduced; and meanwhile, the consumption of CO2 generated by calcining the limestone is reduced, so that the consumption of the limestone and the coke is greatly reduced. Calcium carbide slag generated by a calcium carbide method PVC production device is ground and screened to obtain coarse powder, fine powder and superfine powder, the coarse powder, the fine powder and the superfine powder are mixed in proportion to obtain a calcium carbide slag powder mixture with reasonable grain size distribution, the mixture is used for preparing lime milk, lime milk meeting the ammonia distillation requirement of a sodium carbonate system can be prepared without adding quick lime, the lime milk is used for the ammonia distillation system, and the production cost is reduced. Lime milk notches caused by reduction of lime yield are supplemented, and meanwhile, the utilization value of the solid waste carbide slag is improved.

The present invention provides a method and device system for preparing sodium carbonate and / or sodium bicarbonate and co-producing ammonium sulfate from sodium-based wastewater. According to the phase equilibrium law of a multi-component water-salt system, through the regulation of crystallization kinetics and supersaturation, the sodium-based wastewater does not need to be evaporated and crystallized to produce sodium sulfate solid. Instead, the wastewater after simple pretreatment is directly treated to achieve gradient crystallization separation of sodium sulfate, ammonium sulfate and sodium bicarbonate, thereby obtaining high-quality sodium bicarbonate, sodium carbonate and ammonium sulfate products.

The invention relates to the technical field of chemical equipment, and discloses a sodium carbonate production system adopting an ammonia-soda process. The system for producing sodium carbonate by the ammonia-soda process comprises a thin liquid distillation tower and a flash evaporation module. The thin liquid distillation tower is used for discharging waste thin liquid; the flash evaporation module comprises a second flash evaporation device and a water injection assembly; a steam outlet of the second flash tank is communicated with a steam inlet of the thin liquid distillation tower; the water inlet end of the water injection assembly is communicated with the thin liquid distillation tower, and the water outlet end of the water injection assembly is located in the second flash tank and used for discharging waste thin liquid to flush flash steam in the second flash tank. According to the invention, by arranging the water injection assembly, the waste thin liquid discharged from the thin liquid distillation tower is introduced into the second flash tank for flushing flash steam in the second flash tank so as to flush away droplets in the flash steam, and the content of calcium ions introduced into the thin liquid distillation tower can be reduced, so that the calcium ions in the waste thin liquid are reduced and even eliminated; and the waste thin liquid discharged from the thin liquid distillation tower can be used as filtering washing water.

The present invention provides a method for preparing soda ash or baking soda by resource utilization of coal chemical concentrated brine, the method comprising: removing harmful impurities from coal chemical concentrated brine by induced crystallization, acidolysis and thermally stimulated oxidation to obtain mixed salt and mixed salt mother liquor; separating sodium nitrate from the mixed salt mother liquor, double decomposing and evaporating the mixed salt, ammonium chloride mother liquor and ammonium sulfate mother liquor to obtain sodium sulfate mixed crystals and ammonium chloride enriched solution; obtaining ammonium chloride and ammonium chloride mother liquor from the ammonium chloride enriched solution; dissolving and salting out the sodium sulfate mixed crystals and sodium bicarbonate mother liquor to obtain a saturated sodium sulfate solution and crude ammonium sulfate; obtaining ammonium sulfate and ammonium sulfate mother liquor from crude ammonium sulfate; double decomposing the saturated sodium sulfate solution and ammonium bicarbonate to obtain a sodium bicarbonate product and a sodium bicarbonate mother liquor. The method provided by the present invention obtains baking soda and co-produces high-value ammonium salt products from coal chemical concentrated brine in a short process and at a low cost, thereby realizing the reduction, harmlessness and resource utilization of coal chemical wastewater.

A method for producing soda ash from flue gases involves capturing and processing the gases to remove contaminants and produce a high-purity soda ash. The process involves passing flue gas through a carbon capture system, where nitrates and sulfates are removed from the gas. The gas is then scrubbed with a rich caustic, causing a chemical reaction that removes carbon dioxide. The resulting product is then separated into a purified Na2CO3 product, essentially pure soda ash.

The present invention belongs to the technical field of utilization of hazardous wastes in environmental protection treatment, and particularly relates to a method for producing sodium bicarbonate and ammonium chloride from industrial waste salts. The present invention provides a method for resourcefully producing sodium bicarbonate and ammonium chloride from industrial waste salts. The regenerated sodium chloride is prepared by using the ash water obtained from the gasification and detoxification treatment of industrial waste salts. Then, taking the regenerated sodium chloride and ammonium bicarbonate as raw materials, and the ash water generated in the detoxification process as supplementary water, sodium bicarbonate (sodium bicarbonate) and ammonium chloride are generated through a double decomposition reaction. The present invention utilizes the high-temperature gasification and detoxification process, which not only solves the problem of resource utilization of industrial waste salts, but also reduces the limitation of the double decomposition reaction on the raw material sodium chloride, no longer being limited to industrial sodium chloride as the raw material. Moreover, the process flow is optimized, enabling the utilization rate of industrial waste salts to reach 100%, and the yield of sodium bicarbonate to reach 88.35%.

The present application relates to the technical field of ammonia compound preparation, in particular to a method for preparing ammonium sulfate and co-producing sodium bicarbonate by using sodium sulfate, comprising the following steps: mixing industrial-grade liquid ammonia with deionized water to prepare ammonia water with a free ammonia concentration of 60-120 ti (ti is the abbreviation of titer, which is 1 / 20 mol / L), controlling the temperature of the mixing process to be less than or equal to 40 DEG C to avoid ammonia volatilization, pre-carbonizing by passing in CO2 under the conditions of 20-70 DEG C and a carbon dioxide pressure of 0.1-0.6 MPa, and adding sodium sulfate or a mixture of sodium bicarbonate and mirabilite to obtain a pre-carbonized liquid. The present application adopts an integrated process of pre-carbonization, clarification, carbonization, ammonia separation and low-temperature crystallization, and ammonia evaporation circulation, and can be operated continuously or intermittently, has low industrial implementation difficulty, strong running stability, separates ammonium sulfate by using ammonia separation and low-temperature crystallization technology, replaces the traditional evaporation and concentration process, combines material recycling design, and reduces the energy consumption per unit product compared with the traditional process.

The present invention provides a bicarbonate production method suitable for producing a high purity bicarbonate while suppressing loss of carbon dioxide. The bicarbonate production method includes a generation step of generating a bicarbonate by using a mixed gas that contains carbon dioxide, and a concentration of the carbon dioxide in the mixed gas is 30 volume% or more and 95 volume% or less in a standard state.

The invention discloses a method for preparing large-particle sodium bicarbonate from sodium sulfate. The method comprises the following steps: pretreating raw materials; dynamically adjusting reaction conditions; establishing a raw material database; carrying out multistage continuous crystallization reaction; heat integration and waste heat recovery; the alkali medium is recycled; the temperature gradient design is simplified; double salt crystal separation and resource utilization, and bicarbonate radical concentration control; strengthening double salt separation by a membrane separation technology; and carrying out solid-liquid separation and product collection. In a sodium sulfate raw material dissolving stage, sodium carbonate or sodium bicarbonate is added to adjust the concentration of carbonate in a solution, so that the concentration is stabilized in a target range, ATR FT-IR is used for carrying out in-situ real-time quantitative analysis on carbonate ions in an aqueous solution, carbonate is automatically supplemented through feedback control, and the content of carbonate ions in the aqueous solution is determined. A plate heat exchanger is installed in a multi-stage reaction device, waste heat of previous-stage reaction liquid is utilized to preheat next-stage reaction liquid, and heat in mother liquor is recovered by adopting a vacuum evaporation technology in salting-out crystallization.

The present disclosure relates to new methods and processes of byproduct conversion, wastewater remediation, byproduct upcycling / recycling, and sustainable cyclic methods thereof.

According to the present invention, there is provided a process for converting the lithium of a lithium-containing mineral into soluble form, as well as the use of the lithium-containing slurry or solution obtained from said process in the preparation of crystals of a solid lithium compound.

The invention belongs to the technical field of mineral product processing, and discloses a method for producing crude oil and sodium carbonate from oil-alkali paragenic ore. Comprising the steps of three-phase separation, dehydration, sedimentation, cyclone separation, filtration and purification. After being treated by the treatment method disclosed by the invention, the produced petroleum and sodium carbonate both meet the quality index requirements.

This invention relates to the field of terephthalic acid oxidation residue technology, specifically a high-efficiency treatment method for terephthalic acid oxidation residue, comprising the following steps: S1. Pretreatment; S2. Separation; S3. Evaporation and concentration; S4. Incineration; S5. Ash dissolution; S6. Filtration; S7. Sodium carbonate recovery; S8. Sodium carbonate recycling; S9. Bromine recovery and utilization; S10. Cobalt-manganese catalyst recovery; S11. Precipitate treatment; S12. Cobalt-manganese catalyst recycling. This application utilizes the waste heat or residual heat from the top of the xylene oxidation unit as a heat source to heat and concentrate the first filtrate. The acetic acid flash evaporator in the crystallizer serves as the heat source for evaporator V3 to evaporate and concentrate sodium carbonate, reducing process energy consumption and improving sodium carbonate recovery efficiency. The incineration unit heats the furnace body through external and internal incineration components, achieving efficient incineration of the material, greatly increasing the material's heating efficiency, and improving incineration efficiency and energy utilization.