The compression train (13) for a dehydrogenation plant (1) comprises a driver (36) and a single centrifugal compressor (35) drivingly coupled to the driver. The centrifugal compressor comprises a single casing and a plurality of compressor sections (39.1, 39.2, 39.3) inside said casing (37). Each compressor section comprises at least one impeller (40.1, 40.2) arranged for rotation in the casing (37). The compressor (35) is adapted to compress a mixture containing propane, propylene and hydrogen, having a molecular weight between 20 and 35 g/mol, from a suction pressure between about 0.2 barA and about 1.5 barA to a delivery pressure between about 11 barA and about 20 barA, with a volumetric flowrate comprised between about 120,000 m.sup.3/h and about 950,000 m.sup.3/h.

The compression train (13) for a dehydrogenation plant (1) comprises a driver (36) and a single centrifugal compressor (35) drivingly coupled to the driver. The centrifugal compressor comprises a single casing and a plurality of compressor sections (39.1, 39.2, 39.3) inside said casing (37). Each compressor section comprises at least one impeller (40.1, 40.2) arranged for rotation in the casing (37). The compressor (35) is adapted to compress a mixture containing propane, propylene and hydrogen, having a molecular weight between 20 and 35 g/mol, from a suction pressure between about 0.2 barA and about 1.5 barA to a delivery pressure between about 11 barA and about 20 barA, with a volumetric flowrate comprised between about 120,000 m.sup.3/h and about 950,000 m.sup.3/h.

A composite comprises a carbonaceous and a metallic nanotube conjugated with a carbonaceous support. The composite may be used to remove contaminants from water.

A composite comprises a carbonaceous and a metallic nanotube conjugated with a carbonaceous support. The composite may be used to remove contaminants from water.

The presently disclosed embodiments relate to the utilization of coal-derived fine mineral matter in chemical recycling of plastics or of solid mixed plastic waste. The instantly disclosed mineral based catalyst benefits the processes of catalytic cracking, gasification and steam reforming to maximize carbon utilization and production of plastics of original quality from recycled or renewable feedstocks while reducing the plastic pollution in the environment. The catalyst can be based on inorganic fine mineral matter, a natural ancient mineral mixture found in coal deposits and containing a plurality of transition metals, such as iron, copper, and manganese, as well as calcium, barium, magnesium, potassium, sodium, which can act as co-catalysts. Addition of the catalyst can convert plastic to syngas at a faction of the energy of conventional technologies.

A direct decomposition device for hydrocarbons for directly decomposing hydrocarbons into carbon and hydrogen includes a rector containing a catalyst including a plurality of metal particles with an iron purity of 86% or more. The reactor is configured to be supplied with a raw material gas containing hydrocarbons.

A direct decomposition device for hydrocarbons for directly decomposing hydrocarbons into carbon and hydrogen includes a rector containing a catalyst including a plurality of metal particles with an iron purity of 86% or more. The reactor is configured to be supplied with a raw material gas containing hydrocarbons.

Methods and systems for mixing a catalyst precursor with a heavy oil feedstock preparatory to hydroprocessing the heavy oil feedstock in a reactor to form an upgraded feedstock. Achieving very good dispersion of the catalyst precursor facilitates and maximizes the advantages of the colloidal or molecular hydroprocessing catalyst. A catalyst precursor and a heavy oil feedstock having a viscosity greater than the viscosity of the catalyst precursor are provided. The catalyst precursor is pre-mixed with a hydrocarbon oil diluent, forming a diluted catalyst precursor. The diluted precursor is then mixed with at least a portion of the heavy oil feedstock so as to form a catalyst precursor-heavy oil feedstock mixture. Finally, the catalyst precursor-heavy oil feedstock mixture is mixed with any remainder of the heavy oil feedstock, resulting in the catalyst precursor being homogeneously dispersed on a colloidal and/or molecular level within the heavy oil feedstock.

Methods and systems for mixing a catalyst precursor with a heavy oil feedstock preparatory to hydroprocessing the heavy oil feedstock in a reactor to form an upgraded feedstock. Achieving very good dispersion of the catalyst precursor facilitates and maximizes the advantages of the colloidal or molecular hydroprocessing catalyst. A catalyst precursor and a heavy oil feedstock having a viscosity greater than the viscosity of the catalyst precursor are provided. The catalyst precursor is pre-mixed with a hydrocarbon oil diluent, forming a diluted catalyst precursor. The diluted precursor is then mixed with at least a portion of the heavy oil feedstock so as to form a catalyst precursor-heavy oil feedstock mixture. Finally, the catalyst precursor-heavy oil feedstock mixture is mixed with any remainder of the heavy oil feedstock, resulting in the catalyst precursor being homogeneously dispersed on a colloidal and/or molecular level within the heavy oil feedstock.

Processes for cracking an alkane reactant to form a lower aliphatic hydrocarbon product and for converting an alkane reactant into a higher aliphatic hydrocarbon product are disclosed, and these processes include a step of contacting the alkane reactant with a supported chromium (II) catalyst. In addition to the formation of various aliphatic hydrocarbons, such as linear alkanes, branched alkanes, 1-alkenes, and internal alkenes, aromatic hydrocarbons and hydrogen also can be produced.