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专利涉及到从粗丙烯氧化物流分离丙烯氧化物的过程,例如来自PO/TBA的中间流。粗丙烯氧化物可以通过萃取蒸馏塔蒸馏。蒸馏塔在下述参数下运行:压力25~50psig,和/或温度70~150℃,使用C8~C20石脑油为萃取溶剂,装有塔顶馏出物水洗槽。粗丙烯氧化物流含有0.001%~0.1w%甲醇,以粗丙烯氧化物流总组分物质量为计算基础。本发明的系统,方法和设备可能生产比以前工艺甲醛和乙醛含量低的丙烯氧化物。Lixiangmin(US);etc.WO2012170685
The patent relates to the process of separating propylene oxide from a crude propylene oxide stream, for example an intermediate stream from PO / TBA. The crude propylene oxide can be distilled by an extractive distillation column. The distillation column is operated at a pressure of 25-50 psig and / or at a temperature of 70-150 ° C using a C8-20 Cane naphtha as the extraction solvent and an overhead distiller rinse tank. The crude propylene oxide stream contains 0.001% to 0.1 w% of methanol based on the mass of the total propylene oxide stream component. The systems, methods and apparatus of the present invention make it possible to produce propylene oxide having a lower content of formaldehyde and acetaldehyde than in the prior art. Lixiangmin (US); etc. WO2012170685