ROHRBUENDELAPPARAT MIT EINER ZWISCHENROHRPLATTE

Disclosed is an improved shell-and-tube apparatus, more specifically, a shell-and-tube reactor. The apparatus is of the type that it comprises a vessel (1), at least one intermediate tube plate (3) sectioning the interior of the vessel into at least two compartments (1A, 1B) having temperature difference and plural of heat transferring tubes (2) penetrating the intermediate tube plate or plates, and a fluid passing through the tubes is heated or cooled by a heat transfer medium surrounding the tubes. The apparatus is characterized in that, on one or both sides of the intermediate tube plate (3), at least one insulation plate (4) or plates are provided so that the space between the intermediate tube plate or plates and, if two or more insulation plates are used, the space or spaces between the insulation plates may be utilized as the liquid pool (6) for the heat transfer medium, so as to make the temperature gradient through the intermediate tube plate or plates gentle and relaxate the thermal stress ocurring in the body wall. The apparatus is particularly useful for production of (meth)acrolain and/or (meth)acrylic acid by catalytic gas-phase oxidation of propylene or butenes.