公开(公告)号：DE102006024903A1

公开(公告)日：2007-11-29

申请号：DE102006024903

申请日：2006-05-24

Applicant: BASF AG

Inventor： PINKOS ROLF ,  KAIBEL GERD ,  DAHLHOFF ELLEN ,  WINDECKER GUNTHER ,  HEIMANN JENS

IPC: C07D307/60 ,  C07C55/10

Abstract: The present invention provides a process for preventing fumaric acid deposits in the preparation of maleic anhydride, comprising the following steps: a) absorption of a C4-dicarboxylic acid or of a derivative from a crude product mixture into an organic solvent or water as an absorbent, b) removal of the C4-dicarboxylic acid or of a derivative from the absorbent, the absorbent thus recovered being catalytically hydrogenated fully or partly and recycled fully or partly into the absorption stage (a).

公开(公告)号：CA2657119A1

公开(公告)日：2008-01-31

申请号：CA2657119

申请日：2007-07-16

Applicant: BASF AG

Inventor： HEIMANN JENS ,  PINKOS ROLF ,  WINDECKER GUNTHER ,  URTEL HEIKO ,  POLKA HANS-MARTIN

IPC: C07B63/00 ,  C07C29/149 ,  C07C31/20 ,  C07C209/48

Abstract: The present invention relates to a process for separating solvents from s olvent-containing hydrogenation product mixtures from a catalytic hydrogenat ion process, which mixtures contain a water-soluble hydrogenation product ha ving an alcohol, lactone, ether, lactam or amino group in a solvent which is immiscible or not fully miscible with water and has a boiling point below 1 00°C, characterized in that water is added to the hydrogenation product mixt ure and the solvent-containing phase is separated off and recirculated to th e hydrogenation.