Abstract: Process for the production of aromatic compounds, such as reforming, that uses at least one fixed catalyst bed with a base of platinum and 0.08% rhenium. In said process, before moving onto the bed, the feedstock undergoes a heat exchange with the effluent that is obtained from the process, whereby the exchange is carried out with a pressure drop that is less than 1 bar and a temperature difference that is less than 70° C. The beds are preferably radial and those that are located at the top of the reactor are covered by a cloth layer. The process preferably uses at least two fixed catalyst beds, whereby the first bed (in the direction of circulation of the feedstock) has an Re/Pt ratio by weight that is greater than that of the second bed, and whereby the second catalyst preferably contains at least 0.08% of Re.

Abstract: A process for the regeneration of a sulfur containing catalysts, wherein the catalyst is stripped of sulfur before the oxychlorination treatment of the regeneration process, typically before the catalyst is sent to the regeneration zone. The process is particularly useful for catalyst employed in hydrocarbon conversions such as dehydrogenation reactions, particularly those which comprise the injection of sulfur and/or at least one sulfur compound before or simultaneously to the introduction of the charge into the first reaction zone.

Abstract: An apparatus is provided for concentrating fine or broken particles to separate a particle stream into at least one stream which is concentrated in fine or broken particles and at least one stream with a reduced concentration of fine or broken particles. In addition to introduction and extraction structure, the apparatus includes at least two separator stages each comprising at least one funnel with an inclined or substantially vertical axis which opens upwardly, located beneath an inlet to collect the particles. The funnel is connected to at least one deflector which is directed downwardly to allow particles to flow under gravity and to form a bank of particles at the level of the funnel.

Abstract: Continuous process for the skeletal isomerization of n-olefins containing at the most 20 carbon atoms, in the presence of a catalyst essentially constituted by alumina and titanium, in which a charge containing the said n-olefins is made to flow through at least one fluidized bed reaction zone, the catalyst flowing into each reaction zone. The catalyst drawn off from the final reaction zone is passed into a regeneration zone, at the outlet of which it is passed into a zone where it undergoes a steam treatment prior to its reintroduction into the first reaction zone. The process is performed in the presence of steam, so that the catalyst is in contact with 3 to 85 wt. % (based on the catalyst weight) of steam. The water/olefin charge molar ratio in the reaction zone is between 0.1 and 3.

Abstract: An enclosure in which there circulates a moving bed of solid particles (for example a moving-bed catalytic reactor such as a reforming reactor), is delimited in the enclosure by at least one grill. In the enclosure a fluid passes through the bed in a direction different from that of the flow of the assembly of the particles and issues from the bed by way of at least one grill. Disposed in the thickness of said bed in an intermediate wall (grill) such as to distribute the thrust forces produced by the fluid on the particles in the zones of the bed which are delimited in that way. Jamming of the particles against the grill or grills is greatly reduced and the admissible fluid flow rate is then decreased.

Abstract: A continuous process for the dehydrogenation of paraffinic and olefinic hydrocarbons in the presence of a catalyst comprises circulating a charge containing said paraffinic hydrocarbons through at least two reactions zones of the moving bed type which are arranged in series, the catalyst flowing successively in each reaction zone. The catalyst which is drawn off from the last reaction zone is sent to a regeneration zone at the exit from which it is reintroduced close to the first reaction zone. The process comprises the injection of sulphur and/or at least one sulphur compound before or simultaneously to the introduction of the charge into the first reaction zone. In accordance with the process, the catalyst which is drawn off from the last reaction zone is sent into a stripping zone wherein the sulphur which it contains is removed before the catalyst is sent to the regeneration zone.

Abstract: The invention relates to a means for heating the charge of a catalytic reforming unit operating under low pressure.The invention more particularly relates to an apparatus having in combination a first heat exchanger (6), in which a recycling gas/liquid charge mixture introduced by pipe (5) is completely vaporized, and a second exchanger (9) in which the charge is heated to an adequate temperature by indirect contact with reforming effluent delivered by pipe (17), which successively passes through the two heat exchangers.

Abstract: The invention concerns a regeneration process and the corresponding apparatus for regeneration of a reforming catalyst, the reforming operation being carried out in at least two reactors in series, through which the catalyst and the charge successively flow, the pressure in the first reactor through which the catalyst and the charge pass being under a pressure of between 3 and 8 bars.

Abstract: The invention concerns a method of catalytic reforming in a plurality of fluidized bed type reaction zones located side by side, the catalyst circulating from zone to zone with the aid of elevating means and a carrier gas in the form of hydrogen. According to the invention, nitrogen is used as the elevating gas to raise the exhausted catalyst drawn off from the bottom of the last catalytic zone (through which the feedstock passes) to the top of the catalyst regenerating zone, and also to raise the regenerated catalyst to the top of the first catalytic zone through which the feedstock passes.

Abstract: The invention relates to a means for heating the charge of a catalytic reforming unit operating under low pressure.The invention more particularly relates to an apparatus having in combination a first heat exchanger (6), in which the gaseous recycling-liquid charge mixture introduced by pipe (5) is completely vaporized and a second exchanger (9) in which the charge is heated to an adequate temperature by indirect contact with the reforming effluent arriving by pipe (17), which successively passes through the two heat exchangers.

Abstract: The invention concerns a process for regenerating a hydrocarbon hydroconversion catalyst containing a carrier, at least one group VIII noble metal and a halogen or halogenated compound.It is characterized by an operation in two regeneration zones (1) and (2). The gas effluent from the first regeneration zone (1) is used to feed the second regeneration zone. During the step of burning coke deposited onto the catalyst in the first zone, the heat amount generated during the combustion is used for preheating the feed of said first zone. The temperature of the effluent of said first zone is reduced, through said exchanger, to a value adapted to perform the burning step in the second zone. Additional air is supplied before introducing the gas into said second zone (2) in order to obtain a suitable oxygen concentration.