Abstract: A fluid distributing-collecting system for a device for bringing fluids and solids into contact comprising several distributor plates and several panels for mixing, distributing or extracting fluids. The system comprises at least one level 1 chamber in connection with the outside of said device with at least one hose and, at least one level 2 chamber that is linked with the level 1 chamber and that comprises one or more connecting hoses of a selected length that are arranged in at least one zone. The zone is identified relative to an angle .alpha. relative to a radius of a plate and corresponds to a given angle sector, whereby said hose lengths, angle .alpha. and the angle sector are selected so that the injected fluid arrives approximately at the same time on all of the panels of the same plate. This system is used for separation of paraxylene in a simulated moving bed.

Abstract: The invention relates to a device for controlling the intake air of a spark-ignition four-stroke engine with direct injection of fuel into combustion chamber (1), comprising a main pipe (2) equipped with a throttling means (9), at least a first (3) and a second (4) intake pipe coming from main pipe (2) and opening each into combustion chamber (1), a pipe (7) for recycling the exhaust gases back to the intake equipped with a throttling means (8) and that opens downstream from the throttling means (9) of the main pipe and a means for controlling the air flow supplied to the combustion chamber. According to the invention, said air flow control means comprises a pipe (10) mounted as a bypass on said main pipe (2), around the throttling means (9) thereof, said pipe (10) having a section substantially equal to that of main pipe (2), and a means (11, 12; 14) allowing to seal at least said bypass (10) as a function of the running conditions of the engine.