Purification of carboxyl streams
AssigneeEastman Chemical Company
InventorsStanley J. Okrasinski, Regina M. Moncier, Patricia N. Mercer, Dewey W. Fuller, Jr., Steven L. Cook
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Abstract
Disclosed is a process for the purification of carboxyl streams such as product streams comprising one or more carboxyl compounds selected from carboxylic acids, carboxylic anhydrides and alkylidene dicarboxylates. The process provides a means for the reduction of the iodine content of carboxyl compound product streams which are contaminated with one or more iodine compounds.
Claims15
Process for the reduction in the iodine content of a crude carboxyl product stream comprising (i) one or more carboxyl compounds selected from carboxylic acids, carboxylic anhydrides and alkylidene dicarboxylates and (ii) iodine, one or more iodine-containing compounds or a mixture thereof, which comprises the steps of:
- (1) contacting the crude carboxyl product stream with a copper-containing, scavenger material in an iodine removal zone;
- and
- (2) removing from the iodine removal zone a refined carboxyl product stream containing less iodine than the crude carboxyl stream.
Process for the reduction in the iodine content of a crude acetyl product stream comprising (i) acetic acid, acetic anhydride, a mixture of acetic acid and acetic anhydride, or a mixture of acetic acid, acetic anhydride and ethylidene diacetate and (ii) 500 parts per billion by weight to 250 parts per million by weight iodine present as iodine, one or more iodine-containing compounds or a mixture thereof, which comprises the steps of:
- (1) contacting the crude carboxyl product stream with a copper-containing, scavenger material in an iodine removal zone at a temperature of about 80.degree. to 250.degree. C.;
- and
- (2) removing from the iodine removal zone a refined carboxyl product stream containing less than 20 parts per billion by weight iodine.
Process for the reduction in the iodine content of a crude carboxyl product stream comprising (i) one or more carboxyl compounds selected from carboxylic acids, carboxylic anhydrides and alkylidene dicarboxylates and (ii) iodine, one or more iodine-containing compounds or a mixture thereof, which comprises the steps of:
- (1) contacting a vapor of the crude carboxyl product stream with a copper-containing, scavenger material in an iodine removal zone;
- and
- (2) removing from the iodine removal zone a vapor of a refined carboxyl product stream containing less iodine than the crude carboxyl stream.
Process for the reduction in the iodine content of a crude acetyl product stream comprising (i) acetic acid, acetic anhydride, a mixture of acetic acid and acetic anhydride, or a mixture of acetic acid, acetic anhydride and ethylidene diacetate and (ii) 500 parts per billion by weight to 250 parts per million by weight iodine present as iodine, one or more iodine-containing compounds or a mixture thereof, which comprises the steps of:
- (1) contacting a vapor of the crude carboxyl product stream with a copper-containing, scavenger material in an iodine removal zone at a temperature of about 120.degree. to 250.degree. C.;
- and
- (2) removing from the iodine removal zone a vapor of a refined carboxyl product stream containing less than 20 parts per billion by weight iodine.
Process for the reduction in the iodine content of a crude carboxyl product stream comprising (i) one or more carboxyl compounds selected from carboxylic acids, carboxylic anhydrides and alkylidene dicarboxylates and (ii) iodine, one or more iodine-containing compounds or a mixture thereof, which comprises the steps of:
- (1) contacting a vapor of a mixture of the crude carboxyl product stream and hydrogen with a copper-containing, scavenger material in an iodine removal zone;
- and
- (2) removing from the iodine removal zone a vapor of a refined carboxyl product stream containing less iodine than the crude carboxyl stream.
Process for the reduction in the iodine content of a crude acetyl product stream comprising (i) acetic acid, acetic anhydride, a mixture of acetic acid and acetic anhydride, or a mixture of acetic acid, acetic anhydride and ethylidene diacetate and (ii) 500 parts per billion by weight to 250 parts per million by weight iodine present as iodine, one or more iodine-containing compounds or a mixture thereof, which comprises the steps of:
- (1) contacting a vapor of a mixture of the crude carboxyl product stream and hydrogen with a copper-containing, scavenger material in an iodine removal zone at a temperature of about 120.degree. to 250.degree. C.;
- and
- (2) removing from the iodine removal zone a vapor of a refined carboxyl product stream containing less than 20 parts per billion by weight iodine.
Process for the reduction in the iodine content of a crude acetic acid product stream comprising (i) acetic acid and (ii) 500 parts per billion by weight to 250 parts per million by weight iodine present as iodine, one or more iodine-containing compounds or a mixture thereof, which comprises the steps of:
- (1) contacting a vapor of a mixture of the crude acetic acid stream and hydrogen with a copper-containing, scavenger material selected from copper chromite and copper supported on a catalyst support material in an iodine removal zone at a temperature of about 120.degree. to 250.degree. C.;
- and
- (2) removing from the iodine removal zone a vapor of a refined acetic acid stream containing less than 20 parts per billion by weight iodine.
Dependencies are inferred from the claim text.