Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2011-07-26
2011-07-26
Sullivan, Daniel (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
Reexamination Certificate
active
07985875
ABSTRACT:
The invention relates to a process for preparing an aromatic polycarboxylic acid by liquid phase oxidation of a di- or tri-substituted benzene or naphtalene compound, the process comprising a step of contacting the aromatic compound with an oxidant in the presence of a carboxylic acid solvent, a metal catalyst and a promoter in a reaction zone, wherein the promoter is an ionic liquid comprising an organic cation and a bromide or iodide anion. Advantages of this process include high conversion without severe corrosion problems otherwise associated with halogen-containing compounds as promoter. The process does not necessitate the use of special corrosion-resistant material or liners in the process equipment; thus offering savings on investment and maintenance costs and increasing plant reliability.The process of the invention is especially suited for production of terephthalic acid from p-xylene.
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G.A.Artamkina et al: “Oxidation of alkyl aromatic compounds with potassium permanganate under the conditions of interphase catalysis” J OrgChem USSR vol. 16 No. 4, 1980 p. 612-615.
Al-Luhaidan Sulaiman
Hashmi Syed Azhar
Saudi Basic Industeies Corporation
Sawyer Jennifer C
Sullivan Daniel
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