Abstract:
The present invention relates to a process for preparing secondary amides with good selectivity by carbonylating a corresponding tertiary amine with carbon monoxide in a reaction mixture in the presence of a metal catalyst and in the presence of a halogen containing promoter. The metal catalyst comprises palladium. A same or even a much better catalytic activity can be obtained with palladium than with the much more expensive rhodium, especially when the palladium is used in a low concentration. Moreover, also a good selectivity can be achieved.
Abstract:
The present invention is a process for converting methane to methanol, comprising: feeding methane and gaseous air or oxygen or gaseous air enriched with oxygen to a reactor under an elevated pressure;said reactor having an internal surface, made of silica or coated with silica, surrounding a zone in which said gases react; andreacting said gases in said reaction zone at an elevated temperature at conditions effective to produce methanol and for valuable oxygenates.Advantageously the internal surface is made of quartz or coated with quartzAdvantageously the internal surface, made of silica (advantageously quartz) or coated with silica (advantageously quartz), is treated with HF before the conversion of methane to methanol.Advantageously the reaction is carried out in the absence in said reaction zone of any added material which measurably affects the rate of the reaction or the yield of the product.Advantageously the reactor is operated under a pressure from 1 to 7.5 MPa.Advantageously the reactor is operated at a temperature from 300° C. to 600° C.Advantageously the reactor is operated at a residence time from 0.1 to 100 s.Advantageously the reactor is operated at a methane to oxygen molar ratio from 1 to 50.The present invention also relates to a reactor having an internal surface made of silica (advantageously quartz) or coated with silica (advantageously quartz)
Abstract:
A method is provided for incorporating zeolite crystals in patterned structures, the zeolite crystals having pores (channels) with an orientation which is defined by the topology of the zeolite crystal type and the geometry of the patterned structure, resulting in pores parallel with the length axis of the patterned structures. The patterned structures may be vias (vertical contacts) and trenches (horizontal lines) in a semiconductor substrate. These zeolite crystals can advantageously be used for dense and aligned nanocarbon growth or in other words growth of carbon nanostructures such as carbon nanotubes (CNT) within the pores of the zeolite structure. The growth of CNT is achieved within the porous structure of the zeolite crystals whereby the pores can be defined as confined spaces (channels) in nanometer dimensions acting as a micro-reactor for CNT growth. A method for growing carbon nanostructures within zeolite crystals is also provided, by adding, after creation of the zeolite crystals, a novel compound within the porous structure of the zeolite crystals whereby said novel compound is acting as a carbon source to create the carbon nanostructures. The improved growth method gives a significantly higher carbon density (yield) compared to state of the art techniques.
Abstract:
The present invention relates to a process for preparing secondary amides with good selectivity by carbonylating a corresponding tertiary amine with carbon monoxide in a reaction mixture in the presence of a metal catalyst and in the presence of a halogen containing promoter. The metal catalyst comprises palladium. A same or even a much better catalytic activity can be obtained with palladium than with the much more expensive rhodium, especially when the palladium is used in a low concentration. Moreover, also a good selectivity can be achieved.
Abstract:
The present invention provides a testing system allowing the simultaneous comparative evaluation of the behaviour in a membrane process of two or more selected membranes (4). In a preferred embodiment said system allows the control of the hydrodynamics of the feeding liquid by means of stirrers (13).
Abstract:
Membranes consisting of an elastomeric matrix with dispersed fillers are used in the pressure driven separation of liquid feeds. The fillers are selected in such a way that the interactions between the filler and the elastomer keep the membrane swelling limited, resulting in higher rejections.
Abstract:
A catalyst comprising a chiral transition metal-(1,2-bis(2,5-dialkylphospholano) complex immobilised on a specific zeolitic support useful for the hydrogenation of prochiral substrates.
Abstract:
The present invention is a process for converting methane to methanol, comprising: feeding methane and gaseous air or oxygen or gaseous air enriched with oxygen to a reactor under an elevated pressure; said reactor having an internal surface, made of silica or coated with silica, surrounding a zone in which said gases react; and reacting said gases in said reaction zone at an elevated temperature at conditions effective to produce methanol and for valuable oxygenates. Advantageously the internal surface is made of quartz or coated with quartzAdvantageously the internal surface, made of silica (advantageously quartz) or coated with silica (advantageously quartz), is treated with HF before the conversion of methane to methanol.Advantageously the reaction is carried out in the absence in said reaction zone of any added material which measurably affects the rate of the reaction or the yield of the product.Advantageously the reactor is operated under a pressure from 1 to 7.5 MPa.Advantageously the reactor is operated at a temperature from 300° C. to 600° C.Advantageously the reactor is operated at a residence time from 0.1 to 100 s.Advantageously the reactor is operated at a methane to oxygen molar ratio from 1 to 50.The present invention also relates to a reactor having an internal surface made of silica (advantageously quartz) or coated with silica (advantageously quartz).
Abstract:
The present invention provides a method for preparing a metallosilicate of MFI type, wherein organic templates, seeding techniques, using low aliphatic alcohols miscible with water or homogeneous starting solutions are not required.The present invention relates to a process for making a crystalline metallosilicate with high Si/Metal ratio comprising:a) providing an aqueous medium comprising OH− anions and a metal source, b) providing an aqueous medium comprising an inorganic water insoluble source of silicon, c) optionally providing a non aqueous liquid medium comprising optionally an organic source of silica, d) mixing the medium a), b) and the optional c) at conditions effective to crystallize the desired metallosilicate, e) recovering the desired metallosilicate, wherein in the mixture a)+b)+c), before crystallization, the ratio Si org/Si inorganic is
Abstract:
The present invention provides a testing system allowing the simultaneous comparative evaluation of the behavior in a membrane process of two or more selected membranes (4). In a preferred embodiment said system allows the control of the hydrodynamics of the feeding liquid by means of stirrers (13).