| 主权项 |
1. A process for producing acetic acid, comprising:
carbonylating a reactant feed stream comprising methanol, methyl acetate, dimethyl ether, or mixtures thereof in a reactor in the presence of a water, rhodium catalyst, iodide salt and methyl iodide to form a reaction medium in a reactor; separating reaction medium in a flash vessel to form a liquid recycle stream comprising rhodium catalyst in an amount from 0.01 to 0.5 wt. %, lithium iodide in an amount from 5 to 20 wt. %, corrosion metals in an amount from 10 to 2500 wppm, acetic acid in an amount from 60 to 90 wt. %, methyl iodide in an amount from 0.5 to 5 wt. %, methyl acetate in an amount from 0.1 to 5 wt. %, water in an amount from 0.1 to 8 wt. %, and a vapor product stream comprising acetic acid in an amount from 45 to 75 wt. %, methyl iodide in an amount from 24 to less than 36 wt. %, methyl acetate in an amount of less than or equal to 9 wt. % methyl acetate, water in an amount of less than or equal to 15 wt. %, and hydrogen iodide in an amount of less than or equal to 1 wt. %; and distilling at least a portion of the vapor product stream in a first column to obtain an acetic acid product stream comprising acetic acid and hydrogen iodide in an amount of less than or equal to 300 wppm and an overhead stream comprising methyl iodide, water and methyl acetate. |
