Pretreatment method for chelate resin having pyridine ring used for collecting catalyst in terephthalic acid production process
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United States of America Patent
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May 24, 2016
Grant Date -
Dec 20, 2012
app pub date -
Feb 18, 2011
filing date -
Feb 19, 2010
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Abstract
In pretreating a pyridine ring-containing chelate resin which is used in the step for adsorption and collection of a heavy metal ion and a bromide ion derived from a catalyst from the oxidation reaction mother liquid in the process of producing a terephthalic acid, there may occur phenomena such as swelling of the resin, heat generation of the resin, and air bubbles generation, thereby causing fracture and deterioration of the resin. As a first treatment, Br− conversion, under a certain condition, of a pyridine ring-containing chelate resin with an aqueous solution of hydrobromic acid is performed, and then as a second treatment, replacement with acetic acid solvent is performed, thereby making it possible to prevent fracture and deterioration of the resin.
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