公开(公告)号：CA2171415A1

公开(公告)日：1996-09-11

申请号：CA2171415

申请日：1996-03-08

Applicant: HEFNER WERNER ,  MACHHAMMER OTTO ,  NEUMANN HANS PETER ,  TENTEN ANDREAS ,  RUPPEL WILHELM ,  VOGEL HERBERT

Inventor： HEFNER WERNER ,  MACHHAMMER OTTO ,  NEUMANN HANS-PETER ,  TENTEN ANDREAS ,  RUPPEL WILHELM ,  VOGEL HERBERT

IPC: C07C27/00 ,  C07C27/14 ,  C07C45/35 ,  C07C47/22 ,  C07C51/25 ,  C07C57/04 ,  C07C57/05 ,  C07C57/055

Abstract: In a process for the continuous heterogeneously catalyzed gasphase oxidation of propylene to acrolein, acrylic acid or a mixture thereof in an oxidation reactor whose feed gas mixture comprises, apart from propylene and molecular oxygen as oxidant, only at least one diluent gas which is essentially inert under the conditions of the heterogeneously catalyzed gas-phase oxidation and where, in continuous operation, at least a part of the essentially inert diluent gases present in the product gas mixture is separated off therefrom and is reused as a constituent of the feed gas mixture to the oxidation reactor, the essentially inert diluent gas mixture comprises more than 85 % by volume of at least one saturated hydrocarbon having from 1 to 5 carbon atoms.

公开(公告)号：CA264941A

公开(公告)日：1926-10-12

申请号：CA264941D

Applicant: RUPPEL WILHELM

Inventor： RUPPEL WILHELM

公开(公告)号：CA2157632A1

公开(公告)日：1996-03-09

申请号：CA2157632

申请日：1995-09-06

Applicant: RUPPEL WILHELM ,  WEGERLE ULRIKE ,  TENTEN ANDREAS ,  HAMMON ULRICH

Inventor： RUPPEL WILHELM ,  WEGERLE ULRIKE ,  TENTEN ANDREAS ,  HAMMON ULRICH

IPC: B01J23/28 ,  B01J8/06 ,  B01J21/02 ,  B01J23/16 ,  C07B61/00 ,  C07C51/25 ,  C07C57/04 ,  C07C57/055 ,  C07C51/235

Abstract: A process for the catalytic gas-phase oxidation of acrolein to acrylic acid in a multiple contact tube fixed-bed reactor through whose space surrounding the contact tubes only one heat-exchange medium circuit is passed, at elevated temperature on catalytically active multimetal oxides with an acrolein conversion for a single pass of ity of exchange medium through the multiple contact tube fixed-bed reactor longitudinally, considered over the reaction container as a whole, to the contact tubes in cocurrent to the reaction-gas mixture and secondly superposing a transverse flow within the reaction container by means of an arrangement of successive baffles along the contact tubes which leaves passage cross sections free, so as to give a meandrous flow of the heat-exchange medium, seen in longitudinal section through the contact tube bundle, and setting the flow rate of the circulated heat-exchange medium so that its temperature rises by from 2 to 10.degree.C between the point of entry into the reactor and the point of exit out of the reactor.

公开(公告)号：CA2040981A1

公开(公告)日：1991-10-25

申请号：CA2040981

申请日：1991-04-23

Applicant: AICHINGER HEINRICH ,  RUPPEL WILHELM ,  SEUBERT ROLF ,  BOEHNING KARL HEINZ ,  SCHEIDMEIR WALTER ,  SCHMIDT JOHANNES E ,  SCHWARZMANN MATTHIAS

Inventor： AICHINGER HEINRICH ,  RUPPEL WILHELM ,  SEUBERT ROLF ,  BOEHNING KARL-HEINZ ,  SCHEIDMEIR WALTER ,  SCHMIDT JOHANNES E ,  SCHWARZMANN MATTHIAS

IPC: B01J23/18 ,  B01J8/02 ,  B01J23/22 ,  B01J27/198 ,  C07B61/00 ,  C07C51/265 ,  C07D307/89

Abstract: BASFAKTIENQESELLSCHAFT O.Z.0050/41580 Preparation of phthalic anhydride from o-xylene of the disclosure: Phthalic anhydride is prepared in a multiple tube reactor provided withseparate salt baths, the temperature of the salt bath used for cooling the first layer of catalyst, as regarded in the direction of flow of the reaction mixture, being from 2.degree. to 20.degree.C higher than that of the salt bath(s) associated with the following layer(s).