Isothermal tube reactor

1. A tube isothermal chemical reactor, comprising:

a vessel with a central axis,

an annular reaction space defined inside said vessel, and

an annular tube heat exchanger with a plurality of heat exchange tubes arranged inside said annular reaction space, parallel to said axis,

said heat exchanger comprising a plurality of heat exchange elements in the form of tube packs, each of said tube packs comprising

a bundle of parallel tubes,

a heat-exchange medium feeder and

a heat-exchange medium collector,

the tubes of each tube pack having opposite ends in fluid communication with the respective feeder and collector,

wherein said tube packs are arranged in a plurality of concentric ranks of said annular heat exchanger,

wherein said tube packs are curvilinear, plate-like elements, and

wherein each tube pack forms a sector of a ring of said annular heat exchanger.

2. The reactor according to claim 1 , said heat-exchange medium feeders and heat-exchange medium collectors being formed substantially as box-shaped bodies.

3. The reactor according to claim 2 , said box-shaped bodies comprising:

a front curved face and a rear curved face corresponding to respective strips of cylindrical surfaces;

two lateral faces, two upper and lower faces shaped as sectors of a ring surface.

4. The reactor according to claim 1 , the tube packs being staggered in the axial direction, so that the heat exchange medium feeders and collectors are also staggered at different levels according to an axial coordinate of the reactor, at the fluid inlet/outlet sides of the heat exchanger.

5. The reactor according to claim 4 , the tube packs being staggered so that the feeders and collectors are alternatively located at least at a first level and a second level, so that each feeder or collector located at one level is next to other feeders or collectors located at another level.

6. The reactor according to claim 5 , the tube packs being staggered by a distance which is equal to or greater than the height of the feeders and collectors.

7. The reactor according to claim 1 , where the curvilinear tube packs of the heat exchanger comprise at least outer tube packs which are extended over ring sectors corresponding to a first angle centred on the central axis of the reactor, and second inner tube packs which are extended over ring sectors corresponding to a second angle centred on the same axis, the second angle being greater than the first.

8. The reactor according to claim 1 , each tube pack comprising heat exchange tubes arranged in a plurality of curvilinear and concentric ranks centred on the central axis of said reactor.

9. The reactor according to claim 1 , each tube pack comprising tubes arranged in a triangular pitch or square pitch.