一边抑制羰基化反应器内碘化氢浓度的上升或生成或羰基化反应器的腐蚀,一边生产醋酸。醋酸生产过程包括在含有金属催化剂(如铑催化剂)催化剂系统,碘离子(碘化锂)和甲基碘存在下,在羰基化反应器中甲醇与一氧化碳接触连续反应的步骤;其中:(1)相对于反应器内总液体物质量而言,金属催化剂以质量计浓度保持不低于860× Acetic acid is produced while suppressing the increase of the concentration of hydrogen iodide in the carbonylation reactor or the formation of the carbonylation reactor or the corrosion of the carbonylation reactor. The acetic acid production process comprises the step of contacting methanol continuously with carbon monoxide in a carbonylation reactor in the presence of a catalyst system comprising a metal catalyst such as a rhodium catalyst, iodide (lithium iodide) and methyl iodide; wherein: (1) With respect to the total amount of liquid material in the reactor, the metal catalyst is kept at a concentration of not less than 860 ×