公开(公告)号：BR9904064A

公开(公告)日：2000-09-19

申请号：BR9904064

申请日：1999-09-02

Applicant: DEGUSSA

Inventor： MORAWIETZ MARCUS DR ,  HAAS THOMAS DR ,  BURKHAARDT OLAF DR ,  WANHEERTUM RUDOLF DR

IPC: B01J23/46 ,  C07B61/00 ,  C07C29/132 ,  C07C29/90 ,  C07C31/24 ,  C07C27/00

公开(公告)号：BR9804474A

公开(公告)日：2000-02-29

申请号：BR9804474

申请日：1998-11-06

Applicant: DEGUSSA

Inventor： HAAS THOMAS DR ,  BURKHARDT OLAF DR ,  MORAWIETZ MARCUS DR ,  WANHEERTUM RUDOLF DR ,  BOURREL AGNES

IPC: C07D307/20 ,  C07B35/06 ,  C07C20060101 ,  C07C41/09 ,  C07C43/18 ,  C07D307/06 ,  C07D307/08 ,  C07D309/04 ,  C07D493/04 ,  C07H1/00 ,  C07H3/00

Abstract: Process for producing 5- or 6-membered cyclic ethers (anhydropolyols) comprises subjecting polyols having at least 4 C atoms and at least 2 OH groups to cyclodehydration at at least 100 degrees C in the presence of water, an acid catalyst, an acid-stable hydrogenation catalyst and hydrogen. Preferably the reaction temperature is 100-380 degrees C, preferably 180-280 degrees C. The H2 pressure is 1-20 MPa, preferably 3-10 MPa. The hydrogenation catalyst comprises Ru, Rh, Pd and/or Pt as metals or metal compounds. The hydrogenation catalyst is used in an amount of 0.001-10 (preferably 0.01-1) wt.% based on the polyol. The acid catalyst is a 1-10C aliphatic carboxylic acid, preferably formic, acetic or propionic acid. The acid catalyst is used in an amount of 0.1-20 (especially 0.5-10) wt.% based on the polyol. The polyol is a tetritol, pentitol or hexitol.