Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1995-05-16
1997-07-15
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 5142
Patent
active
056485298
ABSTRACT:
The present invention is directed to a process for the recovery of an organic acid. The organic acid is generated from the manufacture of a cellulose ester. The first step of the process is to remove the organic acid from the manufacture of cellulose ester. The acid is in the form of a weak acid stream comprising of the organic acid and water. The weak acid stream is resolved, via a solvent extraction, to form an extractor overhead stream and raffinate stream. The raffinate stream comprises solvent, water, and alcohol. The alcohol is produced in the recovery process by hydrolysis of the solvent after the solvent extraction. The raffinate stream is resolved into a overhead stream and a bottom stream. The overhead stream comprises water, alcohol, and solvent. Excess organic acid is added to the overhead stream to form a feed stream. The feed stream is catalyzed, via ion exchange resins, whereby a portion of the alcohol is esterified to the solvent. The solvent, thus produced, is recycled into the recovery process.
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Amberlyst.RTM. 35 and Amberlyst.RTM. 36 Resins High Performance Catalysts from Rohm and Haas Company of Philadelphia, PA, 1989.
Amberlyst.RTM. 36 Wet Polmeric Catalyst from Rohm and Haas Company of Philadelphia, PA, 1992.
Degarmo et al., "Consider Reactive Distillation", Chemical Engineering Progress, Mar. 1992, pp. 43-50.
Agreda, V.H. et al., "High-Purity Methyl Acetate via Reactive Distillation", Chemical Engineering Progress, Feb. 1990 pp. 40-46.
Fallon Denis G.
Jones Stephen C.
Dearth Miles B.
Dees Jos,e G.
Hammer III Robert H.
Hoechst Celanese Corporation
Williams Rosalynd
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