Nitrogen Compounds thereof

CCHEMISTRY METALLURGY C01Inorganic chemistry C01BNON-METALLIC ELEMENTS COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C

C01B21/00Nitrogen Compounds thereof

C01B21/02Preparation of nitrogen C01B21/04Purification or separation of nitrogen C01B21/0405Purification or separation processes C01B21/0411Chemical processing only C01B21/0416by oxidation C01B21/0422by reduction C01B21/0427by complexation C01B21/0433Physical processing only C01B21/0438by making use of membranes C01B21/0444characterised by the membrane C01B21/045by adsorption in solids C01B21/0455characterised by the adsorbent C01B21/0461Carbon based materials C01B21/0466Zeolites C01B21/0472Other molecular sieve materials C01B21/0477Temperature swing adsorption C01B21/0483in getters C01B21/0488by absorption in liquids C01B21/0494Combined chemical and physical processing C01B21/06Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon C01B21/0602with two or more other elements chosen from metals, silicon or boron C01B21/0605Binary compounds of nitrogen with carbon C01B21/0607with alkali metals C01B21/061with lithium C01B21/0612with alkaline-earth metals, beryllium or magnesium C01B21/0615with transition metals other than titanium, zirconium or hafnium C01B21/0617with vanadium, niobium or tantalum C01B21/062with chromium, molybdenum or tungsten C01B21/0622with iron, cobalt or nickel C01B21/0625with copper C01B21/0627with one or more rare earth metals C01B21/063with one or more actinides C01B21/0632with gallium, indium or thallium C01B21/0635with germanium, tin or lead C01B21/0637with metals not specified in groups C01B21/0607 - C01B21/0635, other than aluminium, titanium, zirconium or hafnium C01B21/064with boron C01B21/0641Preparation by direct nitridation of elemental boron C01B21/0643Preparation from boron halides C01B21/0645Preparation by carboreductive nitridation C01B21/0646Preparation by pyrolysis of boron and nitrogen containing compounds C01B21/0648After-treatment C01B21/068with silicon C01B21/0682Preparation by direct nitridation of silicon C01B21/0685Preparation by carboreductive nitridation C01B21/0687After-treatment C01B21/072with aluminium C01B21/0722Preparation by direct nitridation of aluminium C01B21/0724using a plasma C01B21/0726Preparation by carboreductive nitridation C01B21/0728After-treatment C01B21/076with titanium or zirconium or hafnium C01B21/0761Preparation by direct nitridation of titanium, zirconium or hafnium C01B21/0763Preparation from titanium, zirconium or hafnium halides C01B21/0765Preparation by carboreductive nitridation C01B21/0766Preparation by pyrolysis of nitrogen containing titanium, zirconium or hafnium compounds C01B21/0768After-treatment C01B21/08Hydrazoic acid Azides Halogen azides C01B21/082Compounds containing nitrogen and non-metals and optionally metals C01B21/0821Oxynitrides of metals, boron or silicon C01B21/0823Silicon oxynitrides C01B21/0825Aluminium oxynitrides C01B21/0826Silicon aluminium oxynitrides C01B21/0828Carbonitrides or oxycarbonitrides of metals, boron or silicon C01B21/083containing one or more halogen atoms C01B21/0832Binary compounds of nitrogen with halogens C01B21/0835Nitrogen trifluoride C01B21/0837Purification C01B21/084containing also one or more oxygen atoms C01B21/0842Halides of nitrogen oxides C01B21/0844Nitrosyl fluoride C01B21/0846Nitrosyl chloride C01B21/0848Nitrosyl perchlorate C01B21/086containing one or more sulfur atoms C01B21/0865Binary compounds of nitrogen with sulfur C01B21/087containing one or more hydrogen atoms C01B21/088containing also one or more halogen atoms C01B21/09Halogeno-amines C01B21/091Chloramine C01B21/092containing also one or more metal atoms C01B21/0923Metal imides or amides C01B21/0926of alkali metals C01B21/093containing also one or more sulfur atoms C01B21/0935Imidodisulfonic acid; Nitrilotrisulfonic acid; Salts thereof C01B21/094Nitrosyl containing acids C01B21/096Amidosulfonic acid Salts thereof C01B21/097containing phosphorus atoms C01B21/0975containing also one or more sulfur atoms C01B21/098Phosphonitrilic dihalides Polymers thereof C01B21/0983Phosphonitrilic difluorides; Polymers thereof C01B21/0986Phosphonitrilic dichlorides; Polymers thereof C01B21/12Carbamic acid or thiocarbamic acid Salts thereof C01B21/125Metal carbamates C01B21/14Hydroxylamine Salts thereof C01B21/1409Preparation C01B21/1418by catalytic reduction of nitrogen oxides or nitrates with hydrogen C01B21/1427by reduction of nitrogen oxides or nitrites with bisulfite or sulfur dioxide C01B21/1436by reaction in the gas phase C01B21/1445of hydoxylamine from its salts C01B21/1454of hydroxylamine salts by processes not covered by one or more of groups C01B21/1418 - C01B21/1445 C01B21/1463Concentration C01B21/1472Separation C01B21/1481Purification C01B21/149Stabilisation C01B21/16Hydrazine Salts thereof C01B21/20Nitrogen oxides Oxyacids of nitrogen Salts thereof C01B21/203Preparation of nitrogen oxides using a plasma or an electric discharge C01B21/206Nitric anhydride (N2O5) C01B21/22Nitrous oxide (N2O) C01B21/24Nitric oxide (NO) C01B21/26Preparation by catalytic or non-catalytic oxidation of ammonia C01B21/262obtaining nitrogen dioxide or tetroxide C01B21/265characterised by the catalyst C01B21/267Means for preventing deterioration or loss of catalyst or for recovering lost catalyst C01B21/28Apparatus C01B21/30Preparation by oxidation of nitrogen C01B21/32Apparatus C01B21/34Nitrogen trioxide (N2O3) C01B21/36Nitrogen dioxide (NO2, N2O4) C01B21/38Nitric acid C01B21/40Preparation by absorption of oxides of nitrogen C01B21/42Preparation from nitrates C01B21/44Concentration C01B21/46Purification Separation; Stabilisation C01B21/48Methods for the preparation of nitrates in general C01B21/50Nitrous acid Salts thereof