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专利披露了从醋酸生产中间体除去烃杂质的方法。方法包括用烃萃取剂萃取中间体。萃取优先用烷烃蒸馏釜底流进行,釜底流包含甲基碘,醋酸和烃杂质。萃取形成包含烃杂质和和萃取剂的轻相以及包含甲基碘和醋酸的重相。萃取重相任意地循环到烷烃蒸馏或羰基化反应。
The patent discloses a method for removing hydrocarbon impurities from acetic acid production intermediates. The method involves extracting the intermediate with a hydrocarbon extractant. The extraction is preferentially carried out with an alkane distillation bottoms stream containing methyl iodide, acetic acid and hydrocarbon impurities. Extract forms a light phase comprising hydrocarbon impurities and an extractant and a heavy phase comprising methyl iodide and acetic acid. The heavy extraction phase is optionally recycled to the paraffin distillation or carbonylation reaction.