65results about "Varying alkali metal carbonate water content" patented technology

Use of physical vapor deposition methodologies to deposit nanoscale gold on activating support media makes the use of catalytically active gold dramatically easier and opens the door to significant improvements associated with developing, making, and using gold-based, catalytic systems. The present invention, therefore, relates to novel features, ingredients, and formulations of gold-based, heterogeneous catalyst systems generally comprising nanoscale gold deposited onto a nanoporous support.

Heterogeneous catalyst systems, methods of making these systems, and methods of using these systems, wherein catalytically active gold is deposited onto composite support media. The composite support media is formed by providing nanoporous material on at least a portion of the surfaces of carbonaceous host material. In representative embodiments, relatively fine, nanoporous guest particles are coated or otherwise provided on surfaces of relatively coarser activated carbon particles. Catalytically active gold may be deposited onto one or both of the guest or host materials either before or after the guest and host materials are combined to from the composite host material. PVD is the preferred catalyst system of depositing gold.

A method of producing sodium bicarbonate having a high degree of purity and obtaining a net reduction in effluent waste water, as compared to prior processes, when starting from trona ore is disclosed. The process entails utilizing the waste-water effluent stream from the conversion of trona ore to sodium carbonate as the feed for the conversion of sodium carbonate to sodium bicarbonate.

This invention relates to a method for the preparation of lithium carbonate from lithium chloride containing brines. The method can include a silica removal step, capturing lithium chloride, recovering lithium chloride, supplying lithium chloride to an electrochemical cell and producing lithium hydroxide, contacting the lithium hydroxide with carbon dioxide to produce lithium carbonate.

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 discloses a system and a process for preparing low-salt dense soda ash by liquid-phase hydration. The method comprises the following steps of: adding light soda ash with the temperature of more than 93 DEG C, condensate water and saturated solution of sodium carbonate according to a mass ratio of 1:0.22:1.4-1:0.22:2.0 into a hydration tank for hydration, wherein the reaction temperature is controlled to be between 100 and 104 DEG C and the reaction time is 20 to 25 minutes, and crystallizing the soda ash in a form of a monohydrate soda, namely Na2CO3.H2O after the reaction; after separating the monohydrate soda crystal slurry with a hydrocyclone separator, feeding the top liquid into a mother liquor storing barrel and feeding the bottom liquid into a centrifuge; after dehydrating the bottom liquid with the centrifuge to obtain a monohydrate soda filter cake; and drying, cooling and screening the monohydrate soda filter cake to obtain the finished product, namely the low-salt dense soda ash, wherein when the centrifuge is used for dehydrating, water is added to wash off a part of salts. The system can guarantee the constant material level of a material bin so that the feeding of the soda ash is stable. The obtained soda ash product has the advantages of large crystallization granule size, high first-rate product rate and high added value, wherein the product with crystallization granule size of more than 180 mu m is up to over 75 percent; the qualification rate is up to 100 percent; and the first-rate product rate is up to 95 percent.

The invention relates to a method for preparing anhydrous sodium carbonate. The preparation method comprises the following steps: (1) dissolving industrial sodium carbonate in water to prepare aqueous solution of the industrial sodium carbonate, and adding sodium hydroxide into the solution to remove Mg2+ and Ca2+; (2) adding hydrogen peroxide into aqueous solution of the sodium carbonate in which the Mg2+ and the Ca2+ are removed to remove Fe2+; (3) introducing CO2 into the aqueous solution of the sodium carbonate in which the Fe2+ is removed; (4) filtering the aqueous solution of the sodium carbonate to obtain sodium carbonate crystals; and (5) washing, dehydrating and drying the sodium carbonate crystals to obtain an anhydrous sodium carbonate finished product serving as a reference reagent. The method can effectively remove the Mg2+, the Ca2+ and the Fe2+ in the industrial anhydrous sodium carbonate, remarkably improve the purity of the product, and meanwhile effectively solve the problem of lower product qualification rate caused by low clarity of the anhydrous sodium carbonate finished product because of concentrating the solution of the sodium carbonate for long term.

The invention discloses a preparation method for reagent-grade anhydrous sodium carbonate. The method comprises the following steps with industrial anhydrous sodium carbonate as a raw material, dissolving the industrial anhydrous sodium carbonate in high-purity water; adding an organic amine immobilized catalyst; introducing carbon dioxide gas to adjust a pH value; and subjecting filtrate obtained after filtration to filtration with a cellulose acetate microporous filtration membrane, crystallization and drying so as to obtain the reagent-grade anhydrous sodium carbonate. The reagent-grade anhydrous sodium carbonate prepared by using the method has purity of 99.9 wt%, less than 10 ppm of impurity anions and less than 5 ppm of impurity metal ions, according with standards for guaranteed reagents prescribed in GBT-639-2008 for anhydrous sodium carbonate. The method has the advantages of simple and convenient operation, a good impurity removal effect, good product purity, low cost and suitability for industrial production.

In a process to produce sodium carbonate,

• • a first production solution comprising sodium carbonate is introduced into less basic compartments of an electrodialyser comprising alternating less basic and more basic adjacent compartments separated from each other by cationic membranes, the more basic compartments being delimited by anionic faces of bipolar membranes on one side and by the cationic membranes on the other side;
  • a second production solution comprising sodium carbonate is introduced into the more basic compartments of the electrodialyser;
  • a solution comprising sodium hydroxide is produced into the more basic compartments by combination of sodium ions flux sodium ions crossing the cationic membrane and hydroxyl ions flux crossing the anionic face of the bipolar membranes, and is then extracted from the electrodialyser to be used as a reaction solution; and
  • the reaction solution is reacted with sodium bicarbonate in order to form a produced solution comprising sodium carbonate.

A process for producing sodium hydrogencarbonate crystals, which comprise subjecting sodium hydrogencarbonate crystal powder having an average particle size of from 50 to 500 μm based on the mass to heat treatment at a temperature of from 70 to 95° C. by a heating gas having a carbon dioxide gas concentration of at most the concentration calculated by the following formula (1):

Carbon dioxide gas concentration=0.07l×e^(0.1×T)×R^{(−0.0005×T−0.9574)}  (1)

(wherein T is the temperature (%) of sodium hydrogencarbonate crystals, and R is the relative humidity (%), provided that the upper limit of the carbon dioxide gas concentration is 100 vol %) with reference to the graph of FIG. 1 wherein the horizontal axis (X-axis) represents the relative humidity and the vertical axis (Y-axis) represents the carbon dioxide gas concentration, to form anhydrous sodium carbonate on the surface of the sodium hydrogencarbonate crystal particles with a content of anhydrous sodium carbonate of from 0.03 to 0.40 mass % in the sodium hydrogencarbonate crystals.

A process for producing 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, can be provided.

The invention relates to a method for preparing high-purity anhydrous sodium carbonate. The method comprises the following steps of: (1) dissolving the anhydrous sodium carbonate; (2) preparing soda crystals, which is to slowly pour solution A into a sieve for filtration, allow the filtrate to flow into a alcohol basin, continuously stir the mixed solution and allow the mixed solution to cool naturally till the sodium carbonate is separated out; and (3) preparing the high-purity anhydrous sodium carbonate, which is to fill product B obtained by step (2) into a polyethylene plastic barrel, add distilled water to dissolve the product B with stirring, heating, stirring and crystallizing the mixed solution, performing crystallization to obtain crystals, and drying the crystals to obtain the high-purity anhydrous sodium carbonate. The method for preparing the high-purity anhydrous sodium carbonate comprises the step that the purified sodium carbonate is filtered to separate out crystals in the ethanol. The whole production process is advanced, the steps are simple, and the process parameters and all operation are easily controlled.

A process for separating crystal from slurry in the procedure of synthesizing heavy sodium carbonate includes such steps as synthesizing heavy sodium carbonate in carbonizing tower, loading the reaction liquid in the thickening equipment, continuously growing crystal grains, loading the solid-liquid mixture in alkali filter for separation, calcining the solid to obtain finished product, and returning the clean liquid back to system.

The present invention discloses a heavy ash fluidizing calcinations and cooling system and its technological process. Said system includes the following several portions: material conveying device, alkali-returning device, calcinations cooling device, dust-removing device and air-supplying device, etc. Besides, said invention also provides their connection mode and concrete steps of said technological process.

The invention discloses a method for comprehensively utilizing solid waste in the methyl carbonate production, comprising the following steps: adding solvent in the solid waste, stirring and evenly mixing the mixture according to the volume ratio of 1:1.5; carrying out filter pressing separation to obtain organic phase solution and sodium carbonate solidoid substance containing crystallization water; distillating the organic phase solution at normal pressure under the condition that the temperature is lower than 70 DEG C to reclaim the solvent and simultaneously obtain about 40 percent of organic phase solution relative to the weight of waste residue; carrying out vacuum distillation on organic matters to obtain 5 percent of methyl carbonate relative to the organic phase, which is more than 85 percent of 1,2-propanediol and 1 percent of ice carbon; and baking the solidoid substance to volatilize to obtain 50 percent of industrial sodium carbonate relative to the weight of solid waste residue. The method overcomes the defects that the prior method causes the environment pollution and influences the safe running of a boiler, sodium carbonate, propanediol and methyl carbonate in the waste are burnt out and cannot be recovered so as to cause waste. The method can energy sources and change wastes into valuables.

A process for recovering sodium carbonate decahydrate crystals from solutions and mother liquors supersaturated in sodium bicarbonate concentration. Feed liquors containing higher levels of sodium bicarbonate than traditionally fed to a sodium carbonate decahydrate crystallizer are used to create a mother liquor within a sodium carbonate decahydrate crystallizer that is supersaturated with respect to sodium bicarbonate. Substantially pure sodium carbonate decahydrate crystals may be precipitated from the supersaturated mother liquor without substantially precipitation of sodium bicarbonate containing crystals.