Process and reactor comprising a plurality of catalyst receptacles

A reactor having a shell comprising:

• one or more reactor tubes located within the shell, said reactor tube or tubes comprising a plurality of catalyst receptacles containing catalyst;
• means for providing a heat transfer fluid to the reactor shell such that the heat transfer fluid contacts the tube or tubes;
• an inlet for providing reactants to the reactor tubes;
• and
• an outlet for recovering products from the reactor tubes;
• wherein the plurality of catalyst receptacles containing catalyst within a tube comprises catalyst receptacles containing catalyst of at least two configurations,
• wherein the catalyst receptacle comprises:
• an annular container, said container having a perforated inner container wall defining an inner channel, a perforated outer container wall, a top surface closing the annular container and a bottom surface closing the annular container;
• a surface closing the bottom of said inner channel formed by the inner container wall of the annular container;
• a carrier outer wall extending from the bottom surface of said container to the top surface;
• a seal extending from the container by a distance which extends beyond the carrier outer wall;
• said carrier outer wall having apertures located below the seal.