| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an improved carbonylation system including a staged reaction for increasing productivity and operating efficiencies in production of acetic acid and pre-flash removal of light ends.SOLUTION: A method for producing acetic acid comprises: catalytically reacting methanol or a reactive derivative thereof with carbon monoxide in the presence of a homogeneous Group VIII metal catalyst and a methyl iodide promoter in a reactor vessel in a liquid reaction mixture including acetic acid, water, methyl acetate, methyl iodide and homogeneous catalyst, the reactor vessel being operated at a reactor pressure; withdrawing reaction mixture from the reaction vessel and feeding the withdrawn reaction mixture along with additional carbon monoxide to a pre-flasher/post reactor vessel operated at a pressure below the reactor vessel pressure; and exhausting light ends in the pre-flasher vessel and concurrently controlling reaction conditions, residence time and composition in the pre- flasher/post reactor vessel such that a mixture in the pre-flasher/post reactor vessel is enriched in acetic acid and diminished in methyl iodide and methyl acetate in the pre-flasher/post reactor vessel.</p> |
