| 摘要 |
<p>THE INVENTION RELATES TO A PROCESS FOR THE EPOXICLATION OF AN OLEFIN COMPRISING (A) REACTING THE OLEFIN WITH HYDROGEN PEROXIDE IN THE PRESENCE OF METHANOL AS SOLVENT IN AT LEAST TWO REACTION STAGES TO OBTAIN A MIXTURE (M-A) COMPRISING OLEFIN OXIDE, UNREACTED OLEFIN, METHANOL AND WATER, WHEREIN BETWEEN AT LEAST TWO REACTION STAGES, OLEFIN OXIDE IS SEPARATED BY DISTILLATION; (B) SEPARATING UNREACTED OLEFIN FROM THE MIXTURE (M-A) BY DISTILLATION TO OBTAIN A MIX- TURE (M-BI) COMPRISING AT LEAST 80 WT.-% OF OLEFIN AND A MIXTURE (M-BII) COMPRISING METHANOL, WATER AND AT LEAST 7 WT -% OF OLEFIN OXIDE; (C) SEPARATING OLEFIN OXIDE FROM THE MIXTURE (M-BII) IN AT LEAST ONE DISTILLATION STAGE TO OBTAIN A MIXTURE (M-CI) COMPRISING AT LEAST 99 WT.-% OF OLEFIN OXIDE AND A MIXTURE (M-CII) COMPRISING WATER AND AT LEAST 55 WT %-OF METHANOL; (D) SEPARATING METHANOL FROM THE MIXTURE (M-CII) IN AT LEAST ONE DISTILLATION STAGE TO OBTAIN A MIXTURE (M-DI) COMPRISING AT LEAST 85 WT-%OF METHANOL AND UP TO 10 WT-% OF WATER, AND A MIXTURE (M-DI) COMPRISING AT LEAST 90 WT %-OF WATER, WHEREIN A VAPOR TOP STREAM (TD) OBTAINED FROM AT LEAST ONE DISTILLATION COLUMN USED IN (D), SAID VAPOR TOP STREAM (TD) COMRISING AT LEAST 85 WT-% METHANOL, IS USED TO OPER- ATE AT LEAST PARTIALLY AT LEAST ONE VAPORIZER USED IN AT LEAST ONE DISTILLATION COLUMN USED IN AT LEAST ONE OF STAGES (A), (B) AND (C).</p> |
