36 results about "Nitrate anion" patented technology

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.

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 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.