US 11,807,597 B2
Methods and systems for producing acetic acid
Vasilis Papavassiliou, Houston, TX (US); Noel C. Hallinan, Loveland, OH (US); David L. Ramage, Friendswood, TX (US); Gary A. Sawyer, Media, PA (US); Rene Zamarripa, Friendswood, TX (US); Michael E. Fitzpatrick, League City, TX (US); and Brian A. Salisbury, Beach City, TX (US)
Assigned to LyondellBasell Acetyls, LLC, Houston, TX (US)
Filed by LyondellBasell Acetyls, LLC, Houston, TX (US)
Filed on Mar. 31, 2022, as Appl. No. 17/710,392.
Claims priority of provisional application 63/170,283, filed on Apr. 2, 2021.
Prior Publication US 2022/0315516 A1, Oct. 6, 2022
Int. Cl. C07C 51/12 (2006.01); B01J 19/00 (2006.01); B01J 19/24 (2006.01); B01J 23/46 (2006.01); C07C 51/44 (2006.01); C07C 51/50 (2006.01)
CPC C07C 51/12 (2013.01) [B01J 19/0013 (2013.01); B01J 19/2465 (2013.01); B01J 23/464 (2013.01); C07C 51/445 (2013.01); C07C 51/50 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for producing acetic acid, the method comprising:
contacting a first amount of carbon monoxide with a reactor fluid, in a reactor, in the presence of a carbonylation catalyst, the reactor fluid comprising iodide, less than or equal to 6 wt % water based on the total weight of the reactor fluid, and one or more additives, in-situ generated derivatives of the one or more additives, or combinations thereof at an additive to iodide molar ratio of 0.5:1 to 5:1, under carbonylation conditions sufficient to form acetic acid and an intermediate reaction product comprising methyl acetate, the reactor fluid having a first concentration of methyl acetate, wherein the one or more additives comprise a compound mixture of tri-n-octylphosphine oxide (TOPO), tri-n-hexylphosphine oxide (THPO), dihexylmonooctylphosphine oxide and dioctylmonohexylphosphine oxide;
directing a first stream comprising a portion of the reactor fluid from the reactor to a reactor cooler, the first stream having a first concentration of methyl acetate;
cooling the portion of the reactor fluid received in the reactor cooler for a residence time sufficient to form a cooled reactor fluid having a second concentration of methyl acetate less than the first concentration of methyl acetate;
directing a second stream comprising the cooled reactor fluid from the reactor cooler to the reactor;
contacting a third stream comprising a second amount of carbon monoxide with at least one of the first stream and the reactor fluid received in the reactor cooler;
maintaining an acetic acid evaporation rate in the reactor; and
recovering acetic acid.