Deiodination Adsorbent for Acetic Acid Purification

ZC-DIO-1 is a silver-loaded zeolite-based adsorbent designed for the removal of trace iodine from acetic acid produced via the carbonyl process. It combines high silver loading capacity with a hierarchical pore structure to deliver iodine removal from 100 ppb down to 5 ppb or lower — meeting the purity requirements for high-grade acetic acid, acetic anhydride, and vinyl acetate production.

The adsorbent uses a binder-free zeolite support with a well-developed hierarchical pore network that facilitates rapid diffusion of iodine-containing species to the active silver sites. Removal mechanisms include a combination of chemisorption, precipitation, complexation, and catalytic conversion, enabling effective capture of both organic iodine compounds and inorganic iodide ions.

Key Features

• Iodine reduction from ~ 100 ppb to ≤ 5 ppb in treated acetic acid
• High silver loading capacity (≥ 7 wt%, up to 10 wt%+)
• Hierarchical pore structure for fast diffusion of iodine species
• Effective against organic iodine, inorganic iodide ions, and elemental iodine
• High mechanical strength (≥ 30 N/pellet) and acid resistance
• Regenerable — single-pass life ≥ 7 months, total life ≥ 2 years
• Also applicable to acetic anhydride and other acidic compounds

Typical Applications

• Purification of acetic acid from methanol carbonylation processes
• Production of high-purity acetic acid for vinyl acetate and acetate ester manufacturing
• Iodine removal from acetic anhydride and halogenated organic streams
• Custom process integration with optional process technology package

Request a sample with your feed composition and target iodine specification to evaluate ZC-DIO-1 for your process.