to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied or formed in practice a reactor 1 which is schematically illustrated in cross section in fig1 has a cylindrical wall 2 with an inner surface 3 that bounds an interior space 4 in the present illustrated embodiment wall 2 is embodied or formed continuously in a circumferential direction however this arrangement is not absolutely necessary that is in place of a wall 2 that is continuous in a circumferential direction it is also possible to use a different reactor in which only a wall section is provided wall 2 is embodied or formed e g from a steel such as stainless steel wall 2 has a mechanical stability sufficient to absorb forces that are produced e g by pressures or flows in interior space 4 reactor 1 can also be referred to as a u201c column u201d or u201c container u201d if liquids or gases that can attack or even destroy wall 2 are present in the interior space 4 it is normally necessary to provide a lining or liner.