Cativa process 1943968 215055012 2008-05-26T14:32:05Z DOI bot 6652755 Citation maintenance. Please [[User:DOI_bot/bugs|report any bugs]] you see. Any concerns? Please [[User_talk:Smith609|Contact the bot's operator]]. [[WP:DOI|Try this bot]] yourself! [[Image:Dicarbonyldiiodoiridium%28I%29-3D-vdW.png|thumb|right|200px|[[Space-filling model]] of the [Ir(CO)<sub>2</sub>I<sub>2</sub>]<sup>−</sup> catalyst used in the Cativa process]] The '''Cativa process''' is a route to the manufacture of [[acetic acid]]. It is similar to the [[rhodium]] based [[Monsanto process]]. The Cativa technology was developed by BP Chemicals Ltd and is the forefront of acetic acid production. The Cativa process is under license BP Plc <ref>{{cite journal | title = The Cativa<sup>TM</sup> Process for the Manufacture of Acetic Acid | author = Jones J. H. | journal = Platinum Metals Review | year = 2002 | volume = 44 | issue = 3 | pages = 94–105 | url = http://www.platinummetalsreview.com/pdf/pmr-v44-i3-094-105.pdf }}</ref> <ref>{{cite journal | title = High productivity methanol carbonylation catalysis using iridium - The Cativa<sup>TM</sup> process for the manufacture of acetic acid | author = Sunley GJ, Watson DJ | journal = Catalysis Today | year = 2000 | volume = 58 | issue = 4 | pages = 293–307 | doi = 10.1016/S0920-5861(00)00263-7 }}</ref> . In the Cativa process the active [[catalyst]] is based on [[iridium]]; [Ir(CO)<sub>2</sub>I<sub>2</sub>]<sup>−</sup>. Due to similar chemistry to the [[Monsanto process]] the same chemical plant may be used. Initial studies by Monsanto had shown the iridium [[Complex (chemistry)|complex]] to be a less active catalyst than the rhodium complex. However subsequent research showed that the iridium catalyst could be promoted using ruthenium, and this combination leads to a ''more'' active and more specific catalyst than the rhodium compound. The switch from [[rhodium]] to the cheaper [[iridium]] allows the use of less water in the reaction mixture. This reduces the number of drying columns necessary, decrease by-products formation and suppress the [[water gas shift reaction]]. Also, a higher catalyst loading can be used. Compared with the Monsanto process, less [[propionic acid]] by-product is produced. == References == {{Reflist}} [[Category:Industrial processes]] [[pt:Processo Cativa]]