摘要:
The present invention relates to a process for the purification of a contaminant-containing stream by bringing the stream to be purified into contact with a heterogeneous photocatalyst with irradiation with light, where the bringing into contact takes place in the presence of at least one compound dissolved in the stream and comprising at least one metal selected from the group consisting of iron, chromium, nickel, cobalt, manganese and mixtures thereof, and to the use of a heterogeneous photocatalyst for the purification of a contaminant-containing stream, where, in the stream to be purified, at least one compound comprising at least one metal selected from the group consisting of iron, chromium, nickel, cobalt, manganese and mixtures thereof is present in dissolved form.
摘要:
The present invention relates to a method of purifying wastewater by contacting the wastewater which is to be purified with a rod-shaped TiO2 photocatalyst which has a BET surface area of 25 to 200 m2/g, a pore volume of 0.10 to 1.00 ml/g, and a median pore diameter of 0.005 to 0.050 μm, with irradiation by light, and to the use of such a rod-shaped TiO2 photocatalyst which has a BET surface area of 25 to 200 m2/g, a pore volume of 0.10 to 1.00 ml/g, and a median pore diameter of 0.005 to 0.050 μm, for purifying wastewater with irradiation by light.
摘要:
The disclosure relates to a process for preparing butadiene. The process involves nonoxidatively catalytically dehydrogenating butane to obtain a product gas stream containing butane, 1-butene, 2-butene, butadiene, hydrogen and secondary constituents. The 1-butene and 2-butene of the product gas stream is then oxidatively dehydrogenated to give a second gas stream containing butane,2-butene, butadiene, hydrogen, steam and secondary constituents. Next, the butane,2-butene and butadiene are separated from the second gas stream and the butane and 2-butene are then separated from the butadiene product. The butane and 2-butene are then recycled into the nonoxidative catalytic dehydrogenating zone.
摘要:
The present invention relates to a process for producing coated nanoparticles comprising a core comprising at least one first substance and at least one envelope at least partly surrounding the core and composed of at least one further substance, in a streaming system, to nanoparticles which can be produced according to this process, to nanoparticles comprising a nonporous core comprising at least one first substance and at least one porous envelope at least partly surrounding the core and composed of at least one further substance, the nanoparticles having a narrow particle size distribution, to the use of such nanoparticles in photocatalysis and to apparatus for carrying out the process.
摘要:
A process for continuous heterogeneously catalyzed partial dehydrogenation of at least one hydrocarbon to be dehydrogenated in a reactor which is manufactured from a steel with specific elemental composition on its side in contact with the reaction gas, and also partial oxidations of the dehydrogenated hydrocarbon and the reactor itself.
摘要:
A process for preparing o-xylene comprises the steps of a) dimerizing 2-butenes to 3,4- and/or 2,3-dimethylhexenes and b) aromatizing the 3,4- and/or 2,3-dimethylhexenes under dehydrogenating conditions to give o-xylene and is suitable for the selective preparation of o-xylene.
摘要:
The disclosure involves a process for preparing butadiene from n-butane. In the process, n-butane is first dehydrogenated autothermally under nonoxidative conditions to form a gas stream. The gas stream is then oxidatively dehydrogenated to form a second gas stream. From the second gas stream, a third gas stream containing n-butane, 2-butene and butadiene is obtained. From the third gas stream, a butadiene/butaine product stream is obtained and remaining n-butane and 2-butene is recycled into the first dehydrogenation zone.
摘要:
A process for preparing 1-butene, which includes nonoxidatively, catalytically dehydrogenating n-butane to obtain a product gas stream of n-butane, 1-butene, 2-butene, butadiene, hydrogen, and secondary constituents; removing hydrogen and the secondary constituents to obtain a C4 product gas stream; separating the C4 product stream into a recycle stream of n-butane and a stream of 1-butene, 2-butene and butadiene by extractive distillation, and recirculating the recycle stream to the dehydrogenation zone; introducing the 1 -butene, 2-butene and butadiene stream into a selective hydrogenation zone and selective hydrogenation of butadiene to 1-butene and/or 2-butene to obtain a stream of 1-butene and 2-butene; introducing the 1-butene and 2-butene stream, and a circulating stream of 1-butene and 2-butene into a distillation zone and isolation of a product stream; and introducing the 2-butene-containing stream into an isomerization zone to obtain a circulating stream of 1-butene and 2-butene, and recirculating the circulating stream to the distillation zone.
摘要:
Process for preparing alpha, beta-unsaturated acyclic or cyclic carbonyl compounds by dehydrogenation of the corresponding saturated carbonyl compounds in the gas phase over a heterogeneous dehydrogenation catalyst comprising platinum and/or palladium and tin on an oxidic support.
摘要:
The invention relates to a process for preparing 4-vinylcyclohexene, which comprises the steps (A) providing an n-butane-containing feed gas stream, (B) feeding the n-butane-containing feed gas stream into at least one dehydrogenation zone and dehydrogenating n-butane to butadiene to give a product stream comprising butadiene, n-butane, possibly 1-butene and 2-butene and possibly water vapor and other secondary constituents, (C) feeding the product stream from dehydrogenation, if appropriate after separating off water vapor and secondary constituents, into a dimerization zone and catalytically dimerizing butadiene to give a product stream comprising 4-vinylcyclohexene, n-butane and possibly 1-butene, 2-butene and unreacted butadiene, and (D) separating off 4-vinylcyclohexene from the product stream from the dimerization and recirculating n-butane and possibly 1-butene, 2-butene and unreacted butadiene to the dehydrogenation zone.