Continuous process for co-production of acetic acid and acetic anhydride by contacting carbon monoxide with a liquid reaction composition containing methyl acetate, dimethyl ether or a mixture thereof, a Group VIII metal catalyst, methyl iodide, acetic acid, acetic anhydride, and water in a concentration of 0.1 wt % or less, withdrawing liquid reaction composition from the reaction zone, introducing at least a portion thereof into a flash separation zone, and removing from the flash separation zone a vapor fraction containing acetic anhydride, acetic acid and methyl iodide and a liquid fraction containing acetic anhydride, and Group VIII metal catalyst. The liquid reaction composition and the withdrawn liquid reaction composition introduced into the flash separation zone contains a Group IA and/or Group IIA metal salt and the molar ratio of acetic acid to acetic anhydride in the vapor fraction removed from the flash separation zone is greater than or equal to 1.
联合生产
醋酸和
醋酐的连续工艺 将
一氧化碳与含有
醋酸甲酯、二
甲醚或其混合物、第 VIII 族
金属催化剂、
碘甲烷、
醋酸、
醋酐和浓度为 0.1 wt % 或更低,从反应区抽出液体反应组合物,将其中至少一部分引入闪蒸分离区,并从闪蒸分离区除去含有
醋酸酐、
醋酸和甲基
碘的蒸气馏分以及含有
醋酸酐和 VIII 族
金属催化剂的液体馏分。引入闪蒸分离区的液体反应组合物和抽出的液体反应组合物含有IA族和/或IIA族
金属盐,从闪蒸分离区抽出的蒸气馏分中
乙酸与
乙酸酐的摩尔比大于或等于1。