公开(公告)号：DE50114954D1

公开(公告)日：2009-08-06

申请号：DE50114954

申请日：2001-08-20

Applicant: BASF SE

Inventor： REUTER PETER ,  VOIT GUIDO ,  HEIDEMANN THOMAS

IPC: C07C51/265 ,  C07D307/89 ,  C07B61/00 ,  C07C51/31

Abstract: A process for preparing phthalic anhydride by gas-phase oxidation of xylene, naphthalene or mixtures thereof over two different fixed-bed catalysts arranged in zones in a shell-and-tube reactor which is thermostated by means of a heat transfer medium is carried out so that the maximum temperature in the second catalyst zone in the flow direction is at least 52° C. lower than the maximum temperature in the first catalyst zone.The process of the present invention makes it possible to prepare phthalic anhydride in high yields under conditions relevant to industrial practice.

公开(公告)号：AT434596T

公开(公告)日：2009-07-15

申请号：AT01980252

申请日：2001-08-20

Applicant: BASF SE

Inventor： REUTER PETER ,  VOIT GUIDO ,  HEIDEMANN THOMAS

IPC: C07C51/265 ,  C07D307/89 ,  C07B61/00 ,  C07C51/31

Abstract: A process for preparing phthalic anhydride by gas-phase oxidation of xylene, naphthalene or mixtures thereof over two different fixed-bed catalysts arranged in zones in a shell-and-tube reactor which is thermostated by means of a heat transfer medium is carried out so that the maximum temperature in the second catalyst zone in the flow direction is at least 52° C. lower than the maximum temperature in the first catalyst zone.The process of the present invention makes it possible to prepare phthalic anhydride in high yields under conditions relevant to industrial practice.

公开(公告)号：ES2326957T3

公开(公告)日：2009-10-22

申请号：ES01980252

申请日：2001-08-20

Applicant: BASF SE

Inventor： REUTER PETER ,  VOIT GUIDO ,  HEIDEMANN THOMAS

IPC: C07C51/265 ,  C07B61/00 ,  C07D307/89 ,  C07C51/31

Abstract: Procedimiento para la obtención de anhídrido de ácido ftálico a través de la oxidación en fase gaseosa de xileno, naftalina o sus mezclas en un reactor de haz tubular termostatizado con un medio portador de calor, en dos catalizador de lecho fijo diferentes, dispuestos en forma de capas, asimismo, el procedimiento es realizado de modo tal que la temperatura máxima en la segunda capa de catalizador, en la dirección de flujo es, al menos, 52ºC más baja que la temperatura máxima en la primera capa de catalizador.