公开(公告)号：EP2027102A2

公开(公告)日：2009-02-25

申请号：EP07729283.7

申请日：2007-05-18

Applicant: BASF SE

Inventor： MACKEWITZ, Thomas ,  ROSOWSKI, Frank ,  TENTEN, Andreas

IPC: C07D307/89

CPC classification number: C07D307/89 ,  C07C51/265 ,  C07C63/16

Abstract: The invention relates to a method for producing phthalic anhydride by catalytic gas phase oxidation of o-xylol. According to said method, a gaseous mixture of o-xylol and an oxygen-containing gas is reacted in a primary reactor to give a gaseous intermediate reaction product which contains unreacted o-xylol, phthalic anhydride reaction products with a lower oxidation state and phthalic anhydride, the reaction heat produced in the primary reactor being at least partially carried off by indirect cooling with a heat exchange medium, and introducing the intermediate reaction product to a secondary reactor. The concentration of the unreacted o-xylol in the intermediate reaction product is at least 1% by weight, and the sum of the concentrations of phthalic anhydride of the lower oxidation state in the intermediate reaction product is at least 0.5% by weight. The method according to the invention allows an increase in total yield of phthalic anhydride without any or without substantial decrease in product quality.

公开(公告)号：EP1968743A1

公开(公告)日：2008-09-17

申请号：EP06830762.8

申请日：2006-12-20

Applicant: BASF SE

Inventor： NETO, Samuel ,  HIBST, Hartmut ,  ROSOWSKI, Frank ,  STORCK, Sebastian ,  ZÜHLKE, Jürgen

IPC: B01J23/68 ,  C07C51/265 ,  C07C51/31 ,  B01J37/08 ,  B01J37/02 ,  B01J35/00

CPC classification number: B01J23/682 ,  B01J23/002 ,  B01J23/96 ,  B01J27/198 ,  B01J35/0006 ,  B01J35/002 ,  B01J37/0018 ,  B01J37/0219 ,  B01J37/0223 ,  B01J37/08 ,  B01J2523/00 ,  C01G31/006 ,  C01P2002/72 ,  C01P2006/12 ,  C07C51/265 ,  C07C51/313 ,  Y02P20/584 ,  C07C63/16 ,  B01J2523/18 ,  B01J2523/3712 ,  B01J2523/55

Abstract: The invention relates to a method for converting a precatalyst which comprises a inert carrier, an organic carbon source and a silver and vanadium containing multimetal oxide to a gas phase oxidation catalyst comprising the inert carrier and a catalytically active silver-vanadium oxide bronze. According to said method, the precatalyst is thermally treated at a temperature of at least 350 °C in a gas atmosphere containing less than 10 % by volume of oxygen. Before the treatment, the carbon source quantity in the precatalyst is adjusted to a value below the critical quantity. The carbon quantity is reduced by separation at a temperature of 80 to 200 °C in an oxygen-containing atmosphere and concurrent decomposition of a portion of the carbon source. The catalysts so obtained are used for partial gas phase oxidation of aromatic hydrocarbons to aldehydes, carboxylic acids and/or carboxylic acid anhydrides.