36 results about "Nitrate anion" patented technology

This invention relates to a Salen type ligand including three or more quaternary ammonium salts of nitrate anions, to a trivalent metal complex compound prepared from this ligand and a method of preparing the same, to a method of preparing polycarbonate by copolymerizing an epoxide compound and carbon dioxide using the complex compound as a catalyst, and to a method of separating and collecting the catalyst from the copolymer after copolymerization. This catalyst used to copolymerize an epoxide compound and carbon dioxide can be more simply prepared, and has lower catalyst preparation and recovery costs, and higher activity, compared to conventional catalysts.

Processes are disclosed for the microbial nitritation of ammonia that attenuate the production of at least one of nitrate anion and nitrous oxide. The processes use an ME biocatalyst having a highly porous, hydrophilic polymeric structure with ammonia-oxidizing microorganisms substantially irreversibly retained therein. The processes are particularly useful for integration with anammox processes.

The present invention relates to the field of solid materials for adsorption of lithium. In particular, the present invention relates to a novel method for preparing a crystallized and shaped solid material, preferably as extrudates, of formula LiXx.2Al(OH)3, nH2O with n being comprised between 0.01 and 10, x being equal to 1 when X is an anion selected from among chloride, hydroxide and nitrate anions, and x being equal to 0.5 when X is an anion selected from among sulfate and carbonate anions, comprising a step a) for precipitation of boehmite under specific temperature and pH conditions, at least one shaping step, preferably by extrusion, said method also comprising a final hydrothermal treatment step, the whole giving the possibility of increasing the adsorption capacity for lithium as well as the adsorption kinetics of the materials obtained as compared with the materials of the prior art when the latter is used in a method for extracting the lithium from saline solutions.

A method for removing an organic ligand from a surface of a particle including:obtaining a particle having an organic ligand disposed on a surface thereof;contacting the particle with an alkylammonium salt represented by Chemical Formula 1:NR′4+A−  Chemical Formula 1wherein groups R′ are the same or different and are each independently hydrogen or a C1 to C20 alkyl group, provided that at least one group R′ is an alkyl group, and A is a hydroxide anion, a halide anion, a borohydride anion, a nitrate anion, a phosphate anion, or a sulfate anion; andheat-treating the particle to carry out a reaction between the alkylammonium salt and the organic ligand.

The invention discloses a preparation method of high-purity nitric acid, which uses industrial-grade nitric acid as a raw material, adds metal nitrate salt for reaction, performs membrane filtration through a microfiltration membrane to remove impurity anions in nitric acid, and passes through melamine-formaldehyde-thiourea resin / The polyacrylic resin composite material membrane is used for membrane filtration to remove impurity cations in nitric acid, and the filtrate is rectified, prepared with high-purity water, blown white, and filtered with a microfiltration membrane to obtain the target product. The content of the high-purity nitric acid obtained by the method of the present invention is 69-70wt%, the impurity metal ion is lower than 1ppb, and the dust particles greater than 0.5 micron are lower than 5 / ml, which meets the standard of SEMI C8, and the microfiltration membrane is used for membrane filtration, and the melamine -Formaldehyde-thiourea resin / polyacrylic acid resin composite membrane is used for membrane filtration, which can effectively remove impurity anions and cations in industrial-grade nitric acid, and the raw materials for making composite membranes can be reused, and the product has good purity, which is suitable for industrial production.

The invention discloses the method for preparation of emulsified nanometer zero valence iron and nanometer bimetallic. The method comprises the following steps: 1 adding the NaBH4 solution into the mixture solution of FeSO4.7H2O and stabilizing agent which is amylogen, getting the emulsified nanometer zero valence iron, the density of amylogen being 0.2-2%, the mole ratio of NaBH4 and FeSO4.7H2O solution being 2:1; 2 mixing emulsified nanometer zero valence iron and K2PdCl6 solution, carrying out reaction, entering nitrogen, when the color of solution changed from bistre to pea green, getting the nanometer bimetallic, the proportion by weight of Pd and Fe being 5-10:10000. The emulsified nanometer zero valence iron and nanometer bimetallic are used to restore the pollution water containing chlorine, nitrate anion and heavy metal. The method is simple, the specific surface area of emulsified bimetallic particle is large, the dispersity is good, and the chemical reactivity is high.

The invention discloses a magnetic cobalt (II) complex based on a ligand derived from 4,4'-bipyridine-itaconic acid and a preparation method thereof. The molecular formula is {[Co(HL) 2 (H 2 O) 2 ]·2NO 3} n , HL represents a ligand derived from 4,4'-bipyridine-itaconic acid that removes a carboxylic acid hydrogen, the single crystal structure has a one-dimensional chain structure, and its asymmetric building block contains half a cobalt(II) ion, a 4,4'-bipyridine-itaconic acid-derived ligand, a terminal coordinated water molecule and a free nitrate anion; the pyridine nitrogen of 4,4'-bipyridine and the double bond in itaconic The addition reaction synthesizes a semi-rigid carboxylic acid ligand containing N(+)-C bonds, and the ligand reacts with cobalt(II) ions to form a cobalt(II) complex in situ; the cobalt(II) complex is in It has slow magnetic relaxation phenomenon at low temperature, and is used as a molecular-based magnetic material in information storage and quantum computing.

A polyetherimide composition includes a polyetherimide and two or more of a residual metal content, a sulfate anion, a phosphate anion, a nitrite anion, a nitrate anion, or a combination including at least one of the foregoing, a residual solvent content, a phosphorus-containing stabilizer, and alkali metal halide, alkaline earth metal halide, alkali metal carbonate, or a combination including at least one of the foregoing, wherein each of the aforementioned components, when present, is included in the composition in a particular amount. The resulting polyetherimide composition exhibits two or more useful properties. The polyetherimide composition can optionally further be combined with a polymer different from the polyetherimide to provide a thermoplastic composition. Methods of making the polyetherimide composition and articles including the polyetherimide composition are also described.

The invention discloses the method of end-alkynes coupling, using end-alkynes as raw material, and using hydrotalcite as accelerating agent. The accelerating agent uses double hydroxy compound of divalent transient metal ion and tervalent transient metal ion as plywood, and uses carbonate or nitrate anion as layer-to-layer negative ion. The reaction condition is normal temperature and normal pressure, the product is 1, 3-alkynyl compound, and the divalent transient metal positive ion possesses the particular accelerating effect. The method has the advantages of good catalytic activity, short reaction time, mild reaction condition, simple operation, low cost and no environmental pollution.

The bimetal salt catalyst system consists of bimetal salt catalyst NM and NM dissolving solvent NS, and has the general expression of NM[NY(I) +MO(II)]+NS(III), where, NM is bimetal salt catalyst, N is one or several of IA, IIA, IB and IIB metals, Y is one or several of halogen, (bi)carbonate radical, (bi)sulfate radical and (bi)phosphate radical, M in MO is one or several of RE metal ions, O is oxygen, carbonate radical and nitrate radical, and NS is organic solvent or water and possesses boiling point of bimetal salt catalyst NM solution higher than 190 deg.c. The bimetal salt catalyst system has high activity, high selectivity and good circular use performance.