Distillation: processes – separatory – Distilling to separate or remove only water – From organic compound
Patent
1981-09-21
1982-10-12
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Distilling to separate or remove only water
From organic compound
203 43, 203 78, 562608, B01D 1104, C07C 5144, C07C 5148
Patent
active
043537847
ABSTRACT:
Disclosed is a method of recovering acetic acid by extracting from an acetic acid-containing aqueous solution with an organic extracting agent and subjecting the extract to distillation, said method comprising the first step of performing extraction by using a tertiary amine having a boiling point higher than that of acetic acid and being capable of forming a non-aqueus phase as the organic extracting agent in combination with an oxygen-containing, high-boiling-point organic solvent selected from the group consisting of di-isobutylcarbinol, isophorene, methyl benzoate, tributyl phosphate, 3,3,5-trimethylcyclohexanone and 2-ethoxyethyl acetate, the second step of performing dehydration by subjecting the extract to distillation, and the third step of subjecting the dehydrated mixture to distillation in a reduced pressure distillation column at a column bottom temperature of 120.degree. to 170.degree. C. to distill acetic acid and separate it from the organic extracting agent.
According to this method, water-free acetic acid can be recovered from an acetic acid-containing aqueous solution at a high separation efficiency with reduced energy consumption, and this recovery method is suitably applied to recovery of acetic acid from acetic acid-containing aqueous solutions discharged from various chemical industrial processes.
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Wardell et al., Solvent Equilibria for Extraction of Carboxylic Acid from Water: Journal of Chem. & Eng. Data, vol. 23, No. 2, 1978, pp. 144-148.
Kishimoto Ryoichi
Koga Kunio
Bascomb, Jr. Wilbur L.
Daicel Chemical Industries Ltd.
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