Abstract: A metal matrix (2) for a heat exchanger (1), comprising a stack of components (4, 5, 6), in particular etched plates or corrugations (4), separator sheets (5) and bars (6), or a combination of the two types of stack, said components (4, 5, 6) being held relative to one another by layers of braze material (3), thereby ensuring the mechanical integrity of the matrix, the matrix including fluid circulation passages (10) within it, each fluid circulation passage (10) having an inner wall provided to fully contain said fluid radially, characterized in that each inner wall is fully covered with a corrosion-resistant coating (7). Preferred application to heat exchangers based on carbon steel or stainless steel.

Abstract: A metal matrix (2) for a heat exchanger (1), comprising a stack of components (4, 5, 6), in particular etched plates or corrugations (4), separator sheets (5) and bars (6), or a combination of the two types of stack, said components (4, 5, 6) being held relative to one another by layers of braze material (3), thereby ensuring the mechanical integrity of the matrix, the matrix including fluid circulation passages (10) within it, each fluid circulation passage (10) having an inner wall provided to fully contain said fluid radially, characterized in that each inner wall is fully covered with a corrosion-resistant coating (7). Preferred application to heat exchangers based on carbon steel or stainless steel.

Abstract: The invention relates to a compact catalytic reactor comprising at least three plates with at least one area of millimetric channels on each plate, promoting heat exchange, and at least one distribution area upstream and/or downstream of the area of millimetric channels, the channels being separated by walls. The distribution areas are characterized by: the discontinuity of the walls along the distribution area on the side of the inflow of gaseous flows or on the side of the outflow thereof; and the increase in the width of the walls along the distribution area on the side of the inflow of gaseous flows or on the side of the outflow thereof.