US 12,240,807 B2
Processes for purification, recovery, and conversion of chlorophenol salts and preparation and recovery of products prepared therefrom
Howard C. Berk, St. Louis, MO (US); Bruno de Kort, St. Louis, MO (US); John Joseph Parlow, Arnold, MO (US); Amy E. Stroman, Hazelwood, MO (US); and Junqiu Yang, St. Louis, MO (US)
Assigned to MONSANTO TECHNOLOGY LLC, St. Louis, MO (US)
Filed by MONSANTO TECHNOLOGY LLC, St. Louis, MO (US)
Filed on Feb. 28, 2023, as Appl. No. 18/115,127.
Application 18/115,127 is a division of application No. 17/136,341, filed on Dec. 29, 2020, granted, now 11,629,114.
Application 17/136,341 is a division of application No. 16/467,622, granted, now 10,913,701, issued on Feb. 9, 2021, previously published as PCT/US2017/064424, filed on Dec. 4, 2017.
Claims priority of provisional application 62/431,205, filed on Dec. 7, 2016.
Prior Publication US 2023/0202961 A1, Jun. 29, 2023
Int. Cl. C07C 63/10 (2006.01); C07C 37/68 (2006.01)
CPC C07C 63/10 (2013.01) [C07C 37/685 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process for removing impurities from a feed mixture comprising 2,5-dichlorophenol (2,5-DCP) and/or a salt thereof, the process comprising:
heating the 2,5-DCP feed mixture to a temperature of at least about 25° C., the 2,5-DCP feed mixture comprising an organic solvent, 2,5-DCP, 2,5-dichloro-4-nitrophenol (2,5-DCNP), and a plurality of chlorophenol dimers;
feeding the 2,5-DCP feed mixture into a first extraction zone;
contacting the feed mixture within the first extraction zone with a first aqueous solution comprising a base, thereby forming a first organic phase extract comprising the organic solvent, 2,5-DCP and the plurality of chlorophenol dimers and forming a first aqueous phase extract comprising 2,5-DCNP and/or salts thereof, the first aqueous phase extract being enriched in 2,5-DCNP and/or salts thereof as compared to the first organic phase extract and the 2,5-DCP feed mixture;
feeding the first organic phase extract into a second extraction zone and contacting the first organic phase extract with a second aqueous solution comprising a base, thereby forming a second organic phase extract comprising the chlorophenol dimers and forming a second aqueous phase extract comprising 2,5-DCP and/or salts thereof, the second organic phase extract enriched in the chlorophenol dimers as compared to the first organic phase extract and the second aqueous phase extract enriched in 2,5-DCP as compared to the first organic phase extract, wherein the plurality of chlorophenol dimers comprise meta-(chloro-(2,5dichlorophenoxy) phenol) (Meta-CDPP) and ortho-(chloro-(2,5dichlorophenoxy) phenol) (Ortho-CDPP) and the second organic phase extract contains at least about 50 wt % of the dimers present in the first organic phase extract.