SHELL-AND-TUBE REACTOR FOR PRODUCING MALEIC ACID ANHYDRIDE Russian patent published in 2015 - IPC C07C51/215 C07C57/145 C07D307/60 B01J8/06 B01J19/00 

FIELD: chemistry.

SUBSTANCE: invention relates to an apparatus for producing maleic acid anhydride via heterogeneous catalytic gas-phase oxidation of an initials stream containing hydrocarbons with at least 4 carbon atoms per molecule, which includes a reactor with a bundle of reaction tubes in which there is a solid-phase catalyst on which an exothermic reaction of the initial stream and an oxygen-containing stream occurs, one or more pumps and one or more heat exchangers mounted outside the reactor, through which a heat carrier flows, which is a molten salt which follows through the space between the reaction tubes, thereby receiving the reaction heat, wherein temperature of the molten salt lies in the range between 350 and 480°C. The reaction tubes are made of heat-resistant alloy steel containing at least 0.25 wt % molybdenum, or at least 0.5 wt % chromium and at least 0.25 wt % molybdenum.

EFFECT: apparatus is characterised by high stability.

5 cl, 4 ex