Patent DE-102008040093-A1 (DE)
Title: Producing a ring like oxidic mold, useful e.g. in partial gas phase oxidation of e.g. an organic compound, comprising mechanical packing of a powdery material which is brought into the fill space of a die made of a metal compound
Inventor: EGER KNUT
IPC: B30B11/02
Filed: 2008-07-02
Abstract: Producing a ring like oxidic mold, comprising mechanical packing of a powdery material which is brought into the fill space of a die made out of components that contain at least one metal compound, which is convertible into a metal oxide through a thermal treatment at >= 100[deg] C or at least comprises one metal oxide, or at least one metal oxide and at least one such metal compound. Producing a ring like oxidic mold, comprising mechanical packing of a powdery material which is brought into the fill space of a die made out of components that contain at least one metal compound, which is convertible into a metal oxide through a thermal treatment at >= 100[deg] C or at least comprises one metal oxide, or at least one metal oxide and at least one such metal compound, to form a ring like precursor mold, in which the fill space is present in a die bore which passes through the die material with a vertical axis of drill B from top to bottom and through the inner wall of the die bore, the upper front surface of lower stamp which has been introduced from below movable up and down along the axis of drill B in the die bore, on which the powdery material which has been introduced into the fill space lies, the length of the axis of drill B in an axial initial distance A above the upper front surfaces of the lower stamp present lower front surfaces movable up and down along the axis of drill B introduced upper stamp, whose lower front surfaces moves in the powdery material introduced in the fill space, and the coat surface is limited by a guided tool sprig MF which is guided from the geometrical middle of the upper front surface of the lower stamp outwardly along the axis of drill which reaches up to the geometrical middle of the lower front surface of the upper stamp, so that the axial initial distance A of both the front surfaces is limited for the packing along the axis of drill B to a pre-determined axial end distance E that one can sink the lower stamp and such that the position of the lower stamp is retained or the lower stamp additionally lifts, where: the geometric form of the coat surface of the lower stamp whose coat surface corresponds to a circular cylinder I; the geometric form of the coat surface of the upper stamp corresponds to a circular cylinder II; in the geometrical middle of the upper front surface of the lower stamp a tool die MB-U has been designed which passes through from top towards the bottom through the lower stamp; in the initial distance A both the front surfaces of the tool sprig MF protrudes from top to bottom through the die bore MB-U until it reaches the geometrical middle of the lower front surfaces of the lower stamp; the tool sprig MF from bottom to top has the geometric form of a circular cylinder Z with a circular cylindrical coat surface MZ; the length of the contours of the circular cylinder Z is smaller that the length of the contours of the circular cylinder I as also smaller than the contours of the circular cylinder II; the position of the tool sprig MF and the position of the dies including that of the die bore on the length of the axis of drill B are fixed relative to each other during the process; in the geometric middle of the lower front surfaces of the lower stamp a tool bore MB-O is designed which goes into the upper stamp and which is connected to at least one outlet of the upper stamp, which can accept the tool sprig MF during a shortening of the initial distance A on the end distance E in a necessary circumference and which can protrude into the tool sprig in at an initial distance A; the symmetry axes of the die bore, of the circular cylinder I, the circular cylinder II, the tool bore MB, the tool sprig MF and the tool bore MB-U lie on a line which runs vertically through the die bore; the die bore has a longitudinal section along its axis of drill, on which length I the geometric form of the inner wall of the die bore whose coat surface correspond to that of a circular cylinder KZ and on whose upper end there is a die bore connected on a longitudinal section II which is directed towards the top, which has the length II; the upper stamp is taken off from the designed ring like precursor molds and the ring like precursor molds are removed from the die bore by lifting the lower stamp after the end of the packing; and also a subsequent procedure of thermal treatment of the ring like precursor molds at >= 100[deg] C during which at least a partial quantity of its components disintegrates during the building of a gaseous compound and/or chemically transformed and the ring like oxidic mold builds itself, where the geometric form of the inner wall of the die bore on the length II of the longitudinal section II from bottom to top whose coat surfaces corresponds to the frustum which extends from bottom to top, whose cross section surface on its lower end of the cross sectional surface of the circular cylinder KZ corresponds to its upper end, provided that by achieving the end distance E the lower front surface of the lower stamp is not present in the longitudinal section II and the upper front surface of the upper stamp is not present in the longitudinal section I, so that the ring like precursor molds which have been built between both the front surfaces by the mechanical packing of the powdery material is partially present in the longitudinal section II while reaching the end distance E. Independent claims are included for: (1) the ring like oxidic mold obtained by the above process; and (2) a tube bundle reactor whose reactor tube contains the ring like oxidic mold.