Abstract: An exchanger having an enclosure with a bottom (5), a cover (4) and a peripheral casing (6), at least one block (1-3) disposed between the bottom and the cover, each block comprising a body, longitudinal channels (10) and transverse channels (12). At least one of the interfaces (112, 114, 123, 135) between two opposite front faces belonging to the cover and to the block adjacent thereto, to the bottom and to the block adjacent thereto, or optionally to two contiguous blocks, a so-called radially inner peripheral seal (J1, J?1) is provided, extending radially outside the area (14) of the openings of the longitudinal channels, and a so-called radially outer peripheral seal (J2, J?2) defining, with the inner peripheral seal and the opposite front faces, an annular space (E, E?) for containing a possible leak of one or the other fluid.

Abstract: A reactor for the synthesis of gaseous HCl from chlorine and hydrogen, including a convector and a furnace having in a bottom portion a burner supplied with chlorine and hydrogen in order to form gaseous HCl. The convector is arranged coaxially above the furnace, and includes a plurality of tubes in contact with a heat-transport fluid, the reactive gases of the furnace passing through the tubes. The heat-transport fluid flows in the space between the tubes, with a perforated tubular plate whereon are attached the tubes of the convector being arranged between the furnace and the convector. All of the inner walls of the reactor in contact with the gaseous HCl are made of a metal alloy, and in the furnace, at least one portion of the inner surfaces of the walls in contact with the gaseous HCl is made of an alloy comprising at least 20 wt % nickel.

Abstract: A reactor for the synthesis of gaseous HCl from chlorine and hydrogen, including a convector and a furnace having in a bottom portion a burner supplied with chlorine and hydrogen in order to form gaseous HCl. The convector is arranged coaxially above the furnace, and includes a plurality of tubes in contact with a heat-transport fluid, the reactive gases of the furnace passing through the tubes. The heat-transport fluid flows in the space between the tubes, with a perforated tubular plate whereon are attached the tubes of the convector being arranged between the furnace and the convector. All of the inner walls of the reactor in contact with the gaseous HCl are made of a metal alloy, and in the furnace, at least one portion of the inner surfaces of the walls in contact with the gaseous HCl is made of an alloy comprising at least 20 wt % nickel.

Abstract: Method for producing coated assembly parts for chemical device elements including the following series of steps: (a) the formation of an initial assembly including a steel support part, typically a plate, a zirconium or zirconium alloy coating, typically a sheet having dimensions similar to those of the steel plate, and at least one brazing material between the support part and the coating, wherein said brazing material is an alloy including silver and copper; (b) the insertion of the initial assembly into a brazing chamber with a controlled atmosphere; (c) the formation of a controlled atmosphere in said chamber; (d) the reheating of said assembly to a temperature at least equal to the melting temperature of said brazing material; wherein, prior to the formation of said initial assembly, the deposition of a titanium or titanium alloy layer on said zirconium (or zirconium alloy) coating is performed, and in that said coating is placed so that its titanium- or (titanium alloy-) coated surface is in contact w