(19)

(11)

EP 0 837 728 A1

(12)

(43) Date of publication: 29.04.1998 Bulletin 1998/18 (21) Application number: 96921163.0 (22) Date of filing: 02.07.1996

(51) International Patent Classification (IPC):  C01B 31/ 08( . ) B01J 23/ 40( . ) B01J 23/ 74( . ) B01J 37/ 08( . ) C07B 61/ 00( . ) C07C 57/ 03( . ) B01J 21/ 18( . ) B01J 23/ 46( . ) B01J 27/ 06( . ) C07B 41/ 06( . ) C07C 51/ 14( . ) B01J 23/ 70( . ) (86) International application number: PCT/NL1996/000272 (87) International publication number: WO 1997/002091 (23.01.1997 Gazette 1997/05)

(84) Designated Contracting States: BE DE ES FR GB IT NL (30) Priority: 05.07.1995 EP 19950201837 (71) Applicant: DSM N.V. 6411 TE Heerlen (NL)	(72) Inventors: NOACK, Andreas D-63303 Dreieich (DE) LUFT, Gerhard D-64367 Mühltal (DE)