296 results about "Dicarbonate" patented technology

A method and apparatus to extract and sequester carbon dioxide (CO₂) from a stream or volume of gas wherein said method and apparatus hydrates CO₂, and reacts the resulting carbonic acid with carbonate. Suitable carbonates include, but are not limited to, carbonates of alkali metals and alkaline earth metals, preferably carbonates of calcium and magnesium. Waste products are metal cations and bicarbonate in solution or dehydrated metal salts, which when disposed of in a large body of water provide an effective way of sequestering CO₂ from a gaseous environment.

A hybrid contact lens includes a substantially rigid center portion and a substantially flexible skirt portion connected to the center portion. The skirt portion is formed using xerogels compatible with diluents comprising at least one selected from polylactic acid, polyglycolic acid, lactide, glycolide, a polyacetal, a cyclic acetal, a polyketal, a cyclic ketal, a polyorthoester, a cyclic orthoester, di-t-butyl-dicarbonate, tris(trimethylsilyl)amine, and 2,2,2-trifluoroacetamide. These diluents are formulated to function as a stand-in for water in the xerogel polymer, allowing the xerogel to form and bond to the rigid center portion in its fully expanded state. Upon hydration of the hybrid lens, substantially little dimensional change, and thus substantially little distortion, is obtained in the skirt portion. The diluents of the present invention further preserve the mechanical integrity of the xerogel, allowing the xerogel to be machined to final shape, improving the dimensional tolerances which can be achieved in the hybrid lens.

The present invention relates to a method for capturing CO₂ from exhaust gas in an absorber (A1), wherein the CO₂ containing gas is passed through an aqueous absorbent slurry wherein said aqueous absorbent slurry comprises an inorganic alkali carbonate, bicarbonate and at least one of an absorption promoter and a catalyst, and wherein the CO₂ is converted to solids by precipitation in the absorber, said slurry having the precipitated solids is conveyed to a separating device (F1), in which the solids are separated off, essentially all of at least one of the absorption promoter and catalyst is recycled together with the remaining aqueous phase to the absorber.

The present invention is directed to an unexpected benefit in a lithium cell derived from using a combination of silver vanadium oxide prepared in a temperature range of about 450° C. to about 500° C. activated with a nonaqueous electrolyte having a passivation inhibitor additive selected from a nitrite, a nitrate, a carbonate, a dicarbonate, a phosphonate, a phosphate, a sulfate and hydrogen fluoride, and mixtures thereof. The benefits include additional battery life resulting from a reduction in voltage delay and RDC build-up. A preferred electrolyte is 1M LiAsF6 in a 50:50 mixture, by volume, of PC and DME having dibenzyl carbonate added therein.

The present invention is a system and method for treating a flue gas stream to remove strong acid compounds selected from the group consisting of hydrofluoric acid (HF), hydrochloric acid (HCl), sulfuric acid (H₂SO₄), and sulfur trioxide (SO₃) by injecting a sodium sorbent selected from the group consisting of sodium sesquicarbonate, sodium carbonate-bicarbonate, trona ore, mechanically refined trona ore, and trona into the flue gas stream, calcining substantially all of the sodium sorbent in the presence of the flue gas stream to form a soda ash, reducing the concentration of the at least one strong acid compound in the flue gas stream by reacting the at least one strong acid compound with the soda ash to form a sodium based by-product; and changing the chemistry of the flue gas stream to reduce the overall average resistivity of the particulate matter.

Nickel-metal-containing solids for use in manufacturing nickel metal complexes are disclosed. The nickel-metal-containing solids are made by reducing basic nickel carbonates. By varying the molar ratios of carbonates and bicarbonates to nickel salts, the methods provide basic nickel carbonates that produce superior nickel metal-containing solids that react more effectively with phosphorous-containing ligands. The phosphorous containing ligands can be both monodentate and bidentate phosphorous-containing ligands.

A composite nano-class antibacterial agent contains nano-zinc oxide and nano-Ag, and is prepared through proportionally dissolving zinc sulfate (or nitrate) in solvent, stirring while dripping solution of ammonium dicarbonate for reaction, stirring, dripping the solution of silver nitrate and ammonium dicarbonate, stirring, washing, centrifugal separation to obtain the precursors of nano-Ag and nano-zinc oxide, vacuum drying and sintering.

ABSTRACT Rare earth oxides capable of being re-used as an abrasive are recovered from an abrasive waste liquid by a process comprising the steps of (1) mixing and heating a rare earth element-containing waste liquid with an acid, to dissolve rare earth elements contained in the liquid; (2) removing insoluble matter from the rare earth element solution; (3) incorporating a soluble carbonate salt or a soluble hydrogencarbonate salt, or an oxalic acid in the rare earth element solution, to convert the rare earth elements to rare earth carbonates or rare earth oxalates; (4) separating the rare earth carbonates or rare earth oxalates from a slurry of the rare earth carbonates or rare earth oxalates; (5) baking the separated rare earth carbonate or rare earth oxalate to produce rare earth oxides; and (6) recovering the rare earth oxides.

An agricultural nutritive composite fertilizer able to increase the resistance of agricultural crops to diseases is prepared from ammonium molybdate, borax, sodium phosphate, urea, potassium sulfate (or chloride), complex copper, complex zinc, potassium dicarbonate and auxiliary.

The preparation method of nano-grade yttrium oxide in rare earth oxide includes the following steps: preparing yttrium-containing inorganic acid salt aqueous solution by adopting hydrochloride or nitrate; regualting the concentration of the yttrium-untaining inorganic salt to 0.1-1.0 mol/L; adding prepared precipitant whic can be carbonate or bicarbonate or basic salt with a certain concentration; washing precipitate with deionized water; adding alcohol-like material which can be n-bulyl alcohol or ethyl alcohol to make surface modification; drying, igniting and heating, and decomposing to obtain the nano rare earth yttrium oxide. The dispersing agent added in the course of preparing yttrium-containing inorganic acid salt aqueous solution or adding precipitant can be polyethylene glycol.

An anion-exchange membrane having quaternary ammonium groups or quaternary phosphonium groups wherein halogen ions serve as the counter ions is obtained. Rather than being subjected to ion exchange with an OH-type membrane using a toxic substance such as sodium hydroxide, the halogen-type anion exchange membrane is brought into contact with a carbonate solution and/or bicarbonate solution to directly obtain an anion exchange membrane where at least some of the counterions of the quaternary ammonium groups or quaternary phosphonium groups are CO₃²⁻ and/or HCO₃⁻.

A vehicle tyre includes a tread formed of a rubber composition that is heat-expandable when unvulcanized, and expanded when vulcanized. When unvulcanized, the composition includes from 50 to 100 phr of a copolymer based on styrene and butadiene; optionally from 0 to 50 phr of another diene elastomer, such as a polybutadiene or a natural rubber; more than 50 phr of a reinforcing filler, such as silica and/or carbon black; between 5 and 25 phr of a sodium- or potassium-including carbonate or hydrogencarbonate; and between 2 and 15 phr of a carboxylic acid having a melting point between 60° C. and 220° C., such as citric acid. A total content of the carboxylic acid and the carbonate or the hydrogencarbonate is greater than 10 phr. Presence of the carboxylic acid and the carbonate or the hydrogencarbonate makes it possible to significantly reduce noise emitted by the tyre during running.

The invention belongs to the technical field of medicines and discloses cytarabine 5'-O-amino-acid ester, pharmaceutically acceptable salts thereof and a preparation method thereof. The preparation method comprises the following steps of: slowly dropping carbobenzoxy chloride into a solution formed by cytarabine, sodium bicarbonate and N,N-dimethylacetylamide, and obtaining a compound A after reacting at room temperature; using the compound A and N-butyloxy formoxyl-amino acid as raw materials; adding a reagent to the solution to carry out an esterification reaction to obtain the cytarabine 5'-O-amino-acid ester; and then adding acid to obtain a finished product. The pharmaceutically acceptable salts comprise hydrochlorides, sulfates, formates, acetates, mesylates, propionates, butyrates, p-toluene sulphonates, phosphates, bisulfates, maleates, lactates, carbonates, bicarbonates, malonates, and salts formed with acidic amino acids, and the like. The invention can obviously improve the membrane permeability of the cytarabine so as to improve the bioavailability of the cytarabine.

The invention relates to a method for preparing high-purity cupric oxide powder from acid cupriferous waste liquid, which comprises the following steps: mixing the acid cupriferous waste liquid and a precipitator (such as hydrocarbonate, carbonate, ammonia, sodium hydroxide or potassium hydroxide, and the like) to react until cupric ions are completely precipitated; washing precipitated slurry with a washing agent (a water solution containing a certain amount of electrolytes) after filtration, and then washing with water; and drying, calcining and pulverizing cupriferous materials after washing to obtain high-purity superfine cupric oxide powder. The acid cupriferous waste liquid can be acid etching waste liquid produced in the production of printed circuit boards. The cupric oxide powder prepared by the method has high purity, simple processes, low production cost and high economic benefit, and is suitable for industrialized production.

The invention discloses a method for preparing lenalidomide. The method comprises the following steps: firstly, etherifying 2-methyl-3-nitrobenzoic acid to obtain 2-methyl-3-nitrobenzoic acid methyl ester, brominating to obtain 2-brooethyl-3-nitrobenzoic acid methyl ester, reacting L-glutamine and tert-butyl dicarbonate to obtain N-Boc glutamic acid, acquiring 3-amino-2,6-piperidine diketone protected by Boc from N-Boc-glutamic acid in the presence of a condensing agent and a catalyst, further reacting with acid to prepare 3-amino-2,6-piperidine diketone hydrochloride, reacting 3-amino-2,6-piperidine diketone with 2-brooethyl-3-nitrobenzoic acid methyl ester so as to obtain 3-(4-nitryl-1,3 dihydro-1-oxo-2 hydrogen-isobenzazole-2-yl) piperidine-2,6-diketone, and finally reducing, thereby obtaining lenalidomide. The method disclosed by the invention is high in product yield.

The invention relates to a method which uses activated oxyful for oxidizing and degrading organic pollutants of waste water. Aiming at overcoming the defect of the complex catalyst preparation of the prior art, the invention provides a method, which is as follows: oxyful with a certain concentration and a catalyst or auxiliary catalyst acting as the activated oxyful are blended with organic wastewater to be treated, and then stirring is carried out for reaction. The catalyst acting as the activated oxyful is a supercarbonate which takes alkali metal lithium, sodium, potassium ion, alkaline-earth metal magnesium, calcium, cesium, barium ion or NH4 as an activated cation; and the auxiliary catalyst takes transition metal iron, manganese or copper as an activated cation and takes chloride ions, nitrate ion, or sulfate ion as an anionic salt. The method moderates reaction condition and has full decolorization and deodorizing effect on the treated sludge; and the COD removal rate can reach 25%-60%.

The present invention provides a developer comprising at least one carbonate, at least one hydrogen carbonate and at least one alkali silicate, wherein the ratio of the total molar concentration “a” of the carbonate and the hydrogen carbonate to the molar concentration “b” of the SiO₂ component present in the alkali silicate: “a/b” ranges from 1:0.3 to 1:2, the total molar concentration of “a” and “b”:“a+b” ranges from 0.1 to 2 mole/L, and the pH value thereof ranges from 9 to 13; and an image-forming method which comprises the steps of imagewise exposing a negative-working image-forming material which comprises a substrate provided thereon with an image-recording layer comprising an infrared light absorber, a polymerization initiator, an ethylenically unsaturated bond-containing monomer and a polymer binder, and then developing the imagewise exposed image-forming material with the foregoing developer. The developer and image-forming method can ensure sufficient developing properties or a satisfactory developing ability at a low pH wherein the image-forming material is hardly damaged. Accordingly, they permit the simultaneous achievement of good printing durability and a good developing ability of an image-forming material. Further, the developing activity of the developer is not hardly reduced due to the action of carbon dioxide and therefore, it does not suffer from a problem originated from the scum formed during development.

A process for preparing bamboo powder from bamboo or its leftover includes such steps as peeling, crushing, steaming, immersing in the solution of edible acetic acid, ammonium dicarbonate and edible sodium pyrosulfite, drying, sterilizing, grinding and sieving.