Process for removing iodide compounds from carboxylic acids and carboxylic acid anhydrides
AssigneesBP Chemicals Limited, The British Petroleum Company p.l.c.
InventorsMichael David Jones, Derrick John Watson, Bruce Leo Williams
Life of this patent
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Abstract
In a process for removing iodide compounds from a liquid composition comprising carboxylic acids having 2 to 6 carbon atoms or anhydrides thereof, by passing the liquid composition through a silver, mercury, palladium and/or rhodium-exchanged strong acid cation exchange resin, prior to contacting with the metal-exchanged resin the composition is contacted with a cation exchanger in the acid form to remove at least a portion of the metal ion contaminants in the liquid composition which have been found to displace the silver, mercury, palladium and/or rhodium from the metal-exchanged resin.
Claims9
A process for removing iodide compounds from a liquid composition comprising a carboxylic acid having 2 to 6 carbon atoms or an anhydride thereof, and metal ion contaminants selected from the group consisting of iron, potassium, sodium and manganese , which process comprises first contacting said liquid composition with a cation exchanger in the acid form to remove at least a portion of said metal ion contaminants, and then contacting the resulting product with a metal-exchanged ion exchange resin having strong acid cation exchange sites at least 1% of which are occupied by at least one metal selected from the group consisting of silver, mercury, palladium and rhodium ..wherein prior to contacting with said metal-exchanged resin, said liquid composition is contacted with a cation exchanger in the acid form to remove at least a portion of said metal ion contaminants.!.. ..
A process for removing C.sub.1 to C.sub.10 alkyl iodides from a liquid composition comprising acetic acid or an anhydride thereof, C.sub.1 to C.sub.10 alkyl iodides and metal ion contaminants selected from the group consisting of iron, potassium, sodium and manganese, which process comprises the steps of:
- (a) passing said liquid composition through a resin bed comprising acid-form strong acid cation exchange resin at a flow rate of 1 to 40 resin bed volumes per hour and at a temperature in the range 20.degree. to 120.degree. C. to remove at least a portion of said metal ion contaminants, and
- (b) passing the product of step (a) through an ion exchange resin bed comprising an ion exchange resin having strong acid cation exchange sites at least 1% of which are occupied by silver, at a flow rate of 1 to 40 resin bed volumes per hour and at a temperature in the range 20.degree. to 120.degree. C.
Dependencies are inferred from the claim text.