PROCESSES FOR PRODUCING ACETIC ACID

摘要

PROBLEM TO BE SOLVED: To provide processes for controlling and monitoring purification systems to remove various impurities present in producing acetic acid.SOLUTION: A carbonylation process for producing acetic acid includes: separating a vapor product stream 113 from a carbonylation reactor 104 to produce a crude acid product comprising acetic acid comprising lithium cations and contacting the crude acetic acid product with a cationic exchanger in the acid form within a treatment device 200 having a plurality of sampling ports so as to produce an intermediate acid product 146; and then contacting the intermediate acetic acid product 146 with a metal-exchanged ion exchange resin having acid cation exchange sites to produce a purified acetic acid.SELECTED DRAWING: Figure 1