37 results about "Sodium Carbonate Monohydrate" patented technology

A process for reclaiming the salt and alkali as the by-product generated in preparing hydrazine hydrate from urea, sodium hypochlorite and sodium hydroxide by oxidizing method includes such steps as preparing slurry by use of rejected hot water, separating salt slurry from alkali slurry, treating the salt slurry through recovering solid salt, dissolving to become saline, refining and reusing it, treating the alkali slurry through calcining low-grade monohydrated sodium carbonate and absorbing tail gas by water, and reusing the mother liquid to prepare slurry.

The process for producing anhydrous sodium carbonate by utilizing natural alkali richly containing sodium hydrogen carbonate includes the following steps: purifying alkali bittern, feeding it into evaporation crystallization tank, introducing steam to make evaporation, concentration, wet decomposition (stripping) and crystallization so as to make most of sodium hydrogen carbonate in the alkali bittern be decomposed and converted into sodium carbonate, finally, in the crystallizer separating the sodium carbonate in the form of crystal carbonate and concentrated crystal soda mixed crystal from mother liquor, and calcining the mixed crystal to obtain invented product heavy anhydrous sodium carbonate whose stacking density is greater than 0.9.

The invention relates to a method for preparing low-salt heavy soda ash by applying a multi-temperature phase diagram of a Na2CO3-NaHCO3-H2O ternary system, utilizing the feature that the system can precipitate anhydrous sodium carbonate crystals at the appropriate temperature and the composition and adopting the anhydrous sodium carbonate flow process. The method comprises the following steps: carrying out pressure wet decomposition on mixed solution of the heavy soda ash which is rich in sodium bicarbonate or refined natural alkali halide, leading the content of the sodium bicarbonate and the content of sodium carbonate in the solution to achieve the corresponding proportion, further leading the solution to enter into a multi-effect evaporator for evaporation and concentration, controlling the crystallization temperature to be above the phase transition point from anhydrous sodium carbonate to sodium carbonate monohydrate, and ensuring that the precipitated solid phase is the anhydrous sodium carbonate; and taking out a magma by self-pressure, carrying out thermal insulation and separation, obtaining a filter cake which mainly contains the anhydrous sodium carbonate, and drying the filter cake for preparing the low-salt heavy soda ash. The process can change the traditional two-step dry calcination to one-step wet calcination, simplify and shorten the process flow, reduce the area occupied by devices, improve the operation environment, simultaneously improve the quality of a product and reduce the energy consumption.

The invention relates to a PTA incineration boiler ash residue solution salt separation crystallization process, and belongs to the technical field of evaporative crystallization. The process comprises the following steps of: dissolving ash of the PTA incineration boiler with waste heat into a nearly saturated solution of sodium carbonate and sodium bromide, and removing metals and other insoluble substances from the solution by adopting a metal sintering filter, separating the obtained filtrate by adopting an evaporative crystallization method to obtain sodium carbonate monohydrate crystals, removing sodium carbonate from the mother liquor by adopting a replacement method, and then separating by adopting an evaporative crystallization method to obtain sodium bromide crystals. Sodium carbonate and sodium bromide in the PTA boiler ash are separated and recovered by adopting an evaporative crystallization method, the process flow is simple, the operation conditions are simple, convenient and stable, and industrialization is facilitated; the high-purity sodium carbonate and sodium bromide recovered by the method can meet the quality requirements of industrial-grade products and can be directly recovered and reused or sold as by-products, so that the purpose of treating waste residues and wastewater is achieved, the requirements of the current environmental protection situation are met, waste can be turned into wealth, recycling of salt is realized, and the benefits of factories are improved.

A method for solution mining nahcolite, capable of extracting nahcolite from geological formations lean in nahcolite comprising injecting high pressure water (which may include recycled aqueous solution of bicarb and sodium carbonate) at a temperature of at least 250° F. into the formation, dissolving nahcolite in the hot water to form a production solution and recovering the production solution. The invention also includes the processing of the production solution to provide sodium carbonate and, optionally, sodium bicarbonate, comprising: decomposing the sodium bicarbonate portion of the hot aqueous production solution to form a hot aqueous solution of sodium carbonate; evaporating water from the hot aqueous solution comprising sodium carbonate to form a concentrated solution of sodium carbonate; producing sodium carbonate monohydrate from the concentrated solution of sodium carbonate by crystallization; and dewatering and calcining the sodium carbonate monohydrate to produce anhydrous sodium carbonate.

The invention relates to a green cycle production novel method of hydrazine hydrate, hydrazonium salts, and ADC foaming agent. The green cycle production novel method is characterized in that: sodium sulfate or sodium carbonate, or a mixture of sodium sulfate and sodium carbonate, is reacted with chlorine and lime emulsion so as to obtain causticized sodium hypochlorite, and the obtained causticized sodium hypochlorite is used for synthesizing hydrazine hydrate; multi-effect continuous evaporation is adopted for separating sodium chloride, sodium carbonate, sodium hydroxide, hydrazine hydrate, and water in an obtained low-concentration hydrazine hydrate solution, hydrazine-containing water vapour obtained via evaporation is subjected to acid neutralization absorption so as to obtain the hydrazonium salts, and left water vapour which is not absorbed is taken as a heat source of a next time of evaporation for reutilization, the hydrazonium salts are continuously collected from different levels of packing absorbing column kettles, sodium chloride and sodium carbonate crystals precipitated after multi-effect evaporator evaporative concentration are subjected to salt and alkali gravity fractionation so as to obtain sodium chloride and monohydrate sodium carbonate respectively; a hydrazine hydrate synthesis reaction liquid is refrigerated, evaporation by-products sodium carbonate decahydrate and monohydrate sodium carbonate are reacted with chlorine and lime emulsion so as to obtain causticized sodium hypochlorite, and then the obtained causticized sodium hypochlorite is recycled for synthesizing hydrazine hydrate.

The invention discloses a method for improving mother solution salinity and reducing pure alkali loss, which comprises the following steps of: controlling the salinity of heavy pure alkali mother solution to be 60 to 110 grams per liter, and adding washing water into crystallized monohydrate sodium carbonate slurry to remove a part of salt and impurities from monohydrate sodium carbonate filter cakes when the slurry enters a centrifugal machine to perform solid-liquid separation, wherein the adding amount of the washing water for washing the monohydrate sodium carbonate filter cakes is 45 to 150 kilograms per ton of heavy pure alkali. Compared with the prior art, the method has the advantage that: the heavy pure alkali product quality can be ensured and the pure alkali loss can be reduced by reasonably controlling the adding amount of the washing water and the salinity of the heavy pure alkali mother solution. The salt mass content index of the product produced by adopting the method is below 0.25 percent, the moisture mass content index is below 5 percent, the alkali consumption is reduced by over half, and the energy consumption is slightly increased.

The invention provides a process for preparing high-quality heavy soda ash by using crude sodium bicarbonate, wherein the high-quality heavy soda ash with low impurity content is obtained by using crude sodium bicarbonate through slurry regulating and steam stripping, sodium carbonate monohydrate crystallization, sodium carbonate monohydrate separation and drying and other steps. According to theprocess for preparing high-quality heavy soda ash by using crude sodium bicarbonate, the production cost can be effectively reduced, and the product quality can be improved.

A process for preparing high-quality low-salt low-potassium heavy sodium carbonate and ammonium chloride through direct vapour calcine, washing impurities (sodium chloride and potassium sulfate) withcondensed water in high-temp condition, reaction to generate water, hydrating with sodium carbonate and hot-air drying includes preparing raw materials, carbonifying, solid-liquid separation, calcine, packing finished sodium carbonate, heat exchange of liquid crystallizing, filtering and packing finished ammonium chloride. Its advantages include short technologica route, simple equipment and low energy consumption.

The invention discloses a desalting and reusing method of high-salinity heavy ash mother liquor in a combined-soda system, which comprises the following steps that (1) when the sodium chloride content of heavy ash mother liquor is higher than 60 g/L, a part of high-salinity heavy ash solution is required to be discharged, and the discharged solution is conveyed to an evaporator to evaporate; (2) the discharged high-salinity heavy ash solution is evaporated to the co-saturated point of sodium carbonate and sodium chloride, so that monohydrate sodium carbonate crystals are precipitated out, and the monohydrate sodium carbonate crystals are separated from residual mother liquor after evaporating; and (3) the separated crystals are dissolved, so that a solution with a sodium chloride content of less than 20 g/L is obtained, and the solution is returned to a heavy ash system to reuse; and the residual mother liquor is applied to a salt-leaching process of a vacuum salt manufacturing device. In a solution which can be reused in the system and obtained by using the method disclosed by the invention, the sodium chloride content of is less than 20 g/L, and the sodium carbonate content is about 310 g/L, so that the solution can meet the index requirements of the heavy ash system.

A process for preparing solid sodium carbonate monohydrate from a solution of sodium carbonate is described.

The invention discloses an aluminum alloy surface treatment agent. The treatment agent is composed of the following components in parts by mass: 10-20 parts of sodium hydroxide, 5-10 parts of deionized water, dodecylbenzenesulfonic acid 10-20 parts of sodium, 2-5 parts of sodium carbonate water, 2-5 parts of silicone oil, 5-10 parts of cocamidopropyl betaine, 5-10 parts of glycerol boric acid fatty acid ester, tetrabasic zinc chromate 5‑10 parts, 5‑10 parts of diatomaceous earth, 1‑3 parts of dispersant, 5‑10 parts of reduced glutathione, 2‑5 parts of organic acid, 1‑3 parts of sodium laureth sulfate , 1‑3 parts of stabilizer, and the balance of water. The invention is beneficial in that it can remove rust and increase luster of aluminum alloy, has strong cleaning power, simple production process, low cost, stable and reliable quality, wide application range, good adsorption, lubricity, and corrosion resistance. And no damage to the surface of aluminum products.

Sodium hydrogencarbonate crystal particles, which comprise sodium hydrogencarbonate crystal particles having an average particle size of from 50 to 500 μm based on the mass, and anhydrous sodium carbonate, and sodium carbonate monohydrate and/or Wegscheider's salt, present on the surface of the sodium hydrogencarbonate crystal particles in such amounts that the total content of anhydrous sodium carbonate, sodium carbonate monohydrate, Wegscheider's salt and sodium sesquicarbonate in the sodium hydrogencarbonate crystal particles is from 0.04 to 1 mass % as calculated as anhydrous sodium carbonate, anhydrous sodium carbonate accounts for at least 40 mass % of the total content, and sodium carbonate monohydrate and/or Wegscheider's salt accounts for from 5 to 60 mass % of the total content. Sodium hydrogencarbonate crystal particles having a low caking property, which are useful in the field of food products, pharmaceuticals, bath additives, etc., which require no necessity to contain an anticaking agent, a process for producing them and a method for packaging them, can be provided.

The invention discloses a process for preparing sodium carbonate crystals by wet pyrolysis of sodium bicarbonate solids, and belongs to the technical field of preparation of sodium carbonate crystals. The process comprises the following steps: S1, slowly adding a sodium bicarbonate solid into a sodium chloride-sodium carbonate double-saturated solution while stirring and heating; S2, after the materials are added, continuously stirring and heating to increase the temperature to 90-118 DEG C, and stopping heating when no carbon dioxide gas is generated; and S3, cooling and filtering to obtain sodium carbonate monohydrate crystals. The process is high in sodium bicarbonate decomposition rate and low in energy consumption, and the product is sodium carbonate solid.

The invention provides a method for preparing monohydrate sodium carbonate and ammonium sulfate from wastes produced in a process for producing sodium cyanate by a urea method. In the method, a process for preparing the sodium cyanate by the urea method is combined with a process for preparing calcined soda by an ammonia-soda method, the wastes produced in the process for preparing the sodium cyanate by the urea method are used as raw materials used in the process for preparing the calcined soda by the ammonia-soda method, and simultaneously, sodium sulfate serving as low-cost industrial raw materials are utilized so as to produce the monohydrate sodium carbonate and coproduce ammonium sulfate, so the potential value of the wastes produced in the process for preparing the sodium cyanate by the urea method is given full play, environmental pollution is reduced, and the economic benefits of enterprises are increased.

The invention relates to ADC foaming agent production technology improvement and wastewater recycling, in particular to a method for preparing industrial sodium carbonate through hydrazine hydrate byproduct sodium carbonate decahydrate by means of the multi-effect evaporation technology. The method comprises the steps that firstly, sodium carbonate decahydrate is dissolved into an alkali dissolution tank, after being preheated by a preheater, the sodium carbonate decahydrate enters all effect evaporators in parallel to be heated, evaporated and concentrated, the sodium carbonate decahydrate is evaporated and crystalized to form monohydrate sodium carbonate, the crystalized monohydrate sodium carbonate is deposited at the bottom of the evaporator, enters a centrifugal machine head tank after being thickened through a salt pump and a suspension separator, and is dehydrated through a centrifugal machine to obtain monohydrate sodium carbonate, and the centrifugal mother liquid is returned back to a sodium carbonate decahydrate storage tank; when the salt and hydrazine hydrate contents are high, the centrifugal mother liquid is fed to other processes to be recycled, then, water is separated out when the monohydrate sodium carbonate is heated, and the monohydrate sodium carbonate is converted into sodium carbonate at the temperature of 109 DEG C, and the finished industrial product sodium carbonate is obtained. The method is unique, no carbonization is needed, comprehensive waste residue government is achieved in the hydrazine hydrate production process, and the purpose of environmental protection is achieved.

Disclosed is a multipurpose potentiator composition comprising: sodium carbonate monohydrate, sodium carbonate anhydrous, potassium nitrate, sodium chloride and water such that the potentiating composition is applied to alter physical or chemical properties or both of a substance on which the potentiating composition is applied. Also provided is a container for holding the composition.