(19)

(11)

EP 1 003 691 A1

(12)

(43) Date of publication: 31.05.2000 Bulletin 2000/22 (21) Application number: 97947975.5 (22) Date of filing: 17.12.1997

(51) International Patent Classification (IPC)7: C01B 33/32 (86) International application number: PCT/KR9700/269 (87) International publication number: WO 9903/782 (28.01.1999 Gazette 1999/04)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 16.07.1997 KR 9733207 (71) Applicant: Korea Research Institute of Chemical Technology Daejun 305-343 (KR)	(72) Inventors: LEE, Jung, Min Daejeon 305-340 (KR) SUH, Jeong, Kwon Daejeon 305-340 (KR) JEONG, Soon, Yong Daejeon 305-333 (KR) PARK, Chun, Hee Seoul 135-110 (KR) PARK, Jeong, Hwan Daejeon 302-282 (KR) KIM, Jong, An Daejeon 302-282 (KR) (74) Representative: Seaborn, George Stephen  Edward Evans & Co.,Clifford's Inn,Fetter Lane London EC4A 1BX London EC4A 1BX (GB)