FIELD: liquid purification methods. SUBSTANCE: metal corrosion impurities are removed from compositions including carboxylic acid and/or its anhydride, rhodium carbonylation catalyst and carbonylation catalyst copromoter through using chelating resin selectively removing corrosive metals rather than carbonylation catalyst and its copromoter. EFFECT: enhanced efficiency of removing impurities. 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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| METHOD TO PRODUCE ACETIC ANHYDRIDE | 0 |
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