摘要:
A method is proposed of producing hydroxylamines from ammonia or the associated amines, hydrogen and oxygen. The method involves the reaction by heterogeneous catalysis of the initial materials; for this purpose, use is made of an oxidation catalyst based on titanium- or vanadium silicates with a zeolitic structure and comprising 0.01-20 wt.% platinum-group metals selected from the group ruthenium, rhodium, palladium, osmium, iridium and platinum, these metals being present in at least two different bonding energy states.
摘要:
A mixture of ketoxime such as methyl ethyl ketone oxime (MEKO), an inorganic acid such as sulfuric acid and optionally water is fed to an intermediate point of a fractional distillation column. Steam is fed to the base of the column and operating conditions are sufficient to produce the corresponding ketone (e.g. methyl ethyl ketone) or its water azeotrope as the overhead product and the corresponding hydroxyl-ammonium salt (e.g. the sulfate) as the bottoms. Crystallization of the salt from the bottoms leaves a mother liquor which may be recycled to a reboiler from which the steam is generated.
摘要:
The invention relates to a method for concentrating an at least partially crystalline solid containing at least one zeolite in a mixture, said mixture containing at least one auxiliary agent, for example a template compound, and the cited solid. The inventive method is characterised in that the mixture is divided into a retentate and a permeate in one step (II) by means of ultrafiltration, the solid content in the retentate being higher than that in the mixture and the solid content in the permeate being lower than that in the mixture. Said method enables auxiliary agents in the permeate, especially template compounds, to be redirected into a crystallisation step (I) which precedes the cited step (II).
摘要:
Direct catalytic process for the production of hydroxylamine by means of the oxidation of ammonia with H₂O₂, wherein the catalyst is composed of silicon, titanium and oxygen and has a crystalline (as in the case of titanium-silicalites, for example) or amorphous structure.
摘要翻译:通过用H 2 O 2氧化氨来生产羟胺的直接催化方法,其中催化剂由硅,钛和氧组成,并且具有结晶(如在例如钛 - 硅沸石的情况下)或无定形结构。
摘要:
The invention relates to a method for concentrating an at least partially crystalline solid containing at least one zeolite in a mixture, said mixture containing at least one auxiliary agent, for example a template compound, and the cited solid. The inventive method is characterised in that the mixture is divided into a retentate and a permeate in one step (II) by means of ultrafiltration, the solid content in the retentate being higher than that in the mixture and the solid content in the permeate being lower than that in the mixture. Said method enables auxiliary agents in the permeate, especially template compounds, to be redirected into a crystallisation step (I) which precedes the cited step (II).
摘要:
A method is proposed of producing hydroxylamines from ammonia or the associated amines, hydrogen and oxygen. The method involves the reaction by heterogeneous catalysis of the initial materials; for this purpose, use is made of an oxidation catalyst based on titanium- or vanadium silicates with a zeolitic structure and comprising 0.01-20 wt.% platinum-group metals selected from the group ruthenium, rhodium, palladium, osmium, iridium and platinum, these metals being present in at least two different bonding energy states.