公开(公告)号：DE50202497D1

公开(公告)日：2005-04-21

申请号：DE50202497

申请日：2002-07-17

Applicant: BASF AG

Inventor： HIBST HARTMUT ,  NOE RALF ,  EXNER MICHAEL ,  DUDA MARK

IPC: C07B61/00 ,  C07D307/60

Abstract: A process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of an n-butene-containing hydrocarbon stream by means of oxygen-containing gases in a shell-and-tube reactor having two successive reaction zones, where the first, feed-side reaction zone contains at least one catalyst which is suitable for the oxydehydrogenation of n-butenes to 1,3-butadiene and the second, product-side reaction zone contains at least one catalyst which is suitable for the oxidation of 1,3-butadiene to maleic anhydride, is carried out using a shell-and-tube reactor which has at least one heat transfer medium circuit in the region of the first, feed-side reaction zone and at least one further heat transfer medium circuit in the region of the second, product-side reaction zone.

公开(公告)号：DE50202149D1

公开(公告)日：2005-03-03

申请号：DE50202149

申请日：2002-09-27

Applicant: BASF AG

Inventor： DANIEL THOMAS ,  EXNER MICHAEL ,  MASSONNE KLEMENS ,  RIEGEL ULRICH ,  WEISMANTEL MATTHIAS

IPC: B65D65/02 ,  A61L15/00 ,  A61L15/60 ,  C07D265/32 ,  C08F8/30 ,  C08K5/357 ,  C08L101/14

Abstract: The invention relates to a method for gel post-crosslinking or surface post-crosslinking water-absorbing hydogels with morpholine-2,3-diones, to the post-crosslinked hydrogels and to the use thereof.