Separation of isopropanol from isopropyl acetate by extractive d

Distillation: processes – separatory – Adding material to distilland except water or steam per se – At least two materials

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Other Related Categories

203 56, 203 57, 203 58, 203 60, 203 64, B01D 340, C07C 2984

Type

Patent

Status

active

Patent number

047189894

Description

ABSTRACT:
Isopropanol cannot be completely removed from isopropanol-isopropyl acetate-water mixtures by distillation because of the presence of the minimum ternary azeotrope. Isopropanol can be readily removed from mixtures containing it, isopropyl acetate and water by using extractive distillation in which the extractive agent is a higher boiling ester of phthalic acid. Typical examples of effective agents are diisooctyl phthalate and methyl benzoate, dibutyl phthalate, methyl benzoate and nitromethane.

REFERENCES:
patent: 2575285 (1951-11-01), Carlson et al.
patent: 2678905 (1954-05-01), Dice
patent: 3013953 (1961-12-01), Frazer
patent: 3284320 (1966-11-01), Fannin et al.
patent: 4379028 (1983-04-01), Berg et al.
patent: 4473444 (1984-09-01), Feldman et al.

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