Patent ID: 7253308

Claim:
A process for making (meth)acrolein or (meth)acrylic acid comprising: continuously oxidizing in a gas phase a C 3 or C 4 precursor in the presence of a catalyst under conditions suitable for the formation of (meth)acrolein or (meth)acrylic acid; wherein said oxidizing takes place in a reactor with a feed for the C 3 or C 4 precursor reaction mixture at one end and for removal of the reaction mixture at the opposite end of the reactor, wherein heat exchanger plates are arranged in the interior of said reactor, and through which plates a heat exchange composition flows for the removal of the heat generated by said oxidation, wherein heat generated by the oxidation is transferred into the heat exchanger plate and then into the heat exchange composition contained inside of the heat exchanger plate, and wherein said heat is removed by evaporative cooling of the heat exchange composition under super atmospheric pressure.