;  WO2005082957-A1 -- EP646603-A1   ;  US5714662-A   UOP (UNVO)   NILSEN H R,  MARKER T L,  VORA B V;  US20030181322-A1   ;  US6271319-B1   MEMBRANE TECHNOLOGY & RES INC (MEMB-Non-standard)   BAKER R W,  DA COSTA A R,  DANIELS R,  PINNAU I,  HE Z;  WO2002026628-A1   ;  WO2002006188-A2   ;  US7067597-B2 -- EP646603-A1   ;  US3407789-A   ;  US3647682-A   UNION CARBIDE CORP (UNIC);  US3758403-A   MOBIL OIL CORP (MOBI);  US3820955-A   ;  US4499055-A   EXXON RES & ENG CO (ESSO)   DINICOLANT A R,  WEI V K;  US4499263-A   PHILLIPS PETROLEUM CO (PHIP)   MESSURA K A,  AYRES C A;  US4705541-A   ;  US4814067-A   STONE & WEBSTER ENG CORP (STWE)   GARTSIDE R J,  NORTON R C;  US4828679-A   MOBIL OIL CORP (MOBI)   CORMIER W E,  KUEHL H,  STOVER W A;  US4980053-A   CHINA NAT CHEM CORP RES INST PETROLEUM (SNPC);  CHUGOKU SEKIYU KAKO (CHUG);  PETROCHEMIC SCI RES (PETR-Non-standard);  SINOPEC RES INST PE (SNPC)   ZAITING L,  SHUNHUA L,  XINGPIN G;  US5326465-A   CHINA PETRO CHEM CORP (SNPC);  SINOPEC RES INST PETROLEUM PROCESSING (SNPC)   HUO Y,  WANG Z,  WANG Y,  LU Y;  US5714662-A   UOP (UNVO)   NILSEN H R,  MARKER T L,  VORA B V;  US5981818-A   STONE & WEBSTER ENG CORP (STWE)   PURVIS D,  MC CUE R H;  US20030181322-A1   ;  US6271319-B1   MEMBRANE TECHNOLOGY & RES INC (MEMB-Non-standard)   BAKER R W,  DA COSTA A R,  DANIELS R,  PINNAU I,  HE Z;  US6303839-B1   UOP LLC (UNVO)   MARKER T L;  US6406521-B1   ;  US6517611-B1   ENGELHARD CORP (ENGH)   KUZNICKI S M,  BELL V A;  US6593506-B1   EXXONMOBIL CHEM PATENTS INC (ESSO)   SEARLE R G;  US6660812-B2   EXXONMOBIL CHEM PATENTS INC (ESSO)   KUECHLER K H,  DECHELLIS M L,  SELLEN R D,  JANDA G F,  LUMGAIR D R,  CHENG M;  WO2002026628-A1   ;  WO2002006188-A2   ;  EP1723183-B1 -- EP646603-A1   ;  US5714662-A   UOP (UNVO)   NILSEN H R,  MARKER T L,  VORA B V;  US20030181322-A1   ;  US6271319-B1   MEMBRANE TECHNOLOGY & RES INC (MEMB-Non-standard)   BAKER R W,  DA COSTA A R,  DANIELS R,  PINNAU I,  HE Z;  WO2002026628-A1   ;  WO2002006188-A2   ;  CN1922218-B -- CN1109066-A   ;  CN1224705-A   UOP (UNVO)   NILSEN H R,  MARKER T L,  VORA B V;  CN1383448-A   EXXONMOBIL CHEM PATENTS INC (ESSO)   STUNTZ G F;  CN1441756-A   EXXONMOBIL CHEM PATENTS INC (ESSO)   KUECHLER K H,  DECHELLIS M L,  SELLEN R D,  JANDA G F,  LUMGAIR D R,  CHENG M;  US6271319-A   MEMBRANE TECHNOLOGY & RES INC (MEMB-Non-standard)   BAKER R W,  DA COSTA A R,  DANIELS R,  PINNAU I,  HE Z;  US20030181322-A1   ;  GC2498-A -- EP646603-A1   ;  WO2002006188-A1   ;  WO2002026628-A1   ;  WO2003033441-A1   EXXONMOBIL CHEM PATENTS INC (ESSO)   CHENG M,  PHILLIPS J J,  NICOLETTI M P,  LUMGAIR D R,  SHUTT J R,  KABIN J A,  BORGMANN W,  KUNKEL J,  FRITZ H,  WALZL R,  LAUERMANN G,  MULLER K