Separation of amines by preferential aqueous salt extraction

Details Separation of amines by preferential aqueous salt extraction Separation of amines by preferential aqueous salt extraction

1981-12-17

1984-12-18

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564438, C07C 8526

Patent

active

044892098

ABSTRACT:
A process of separating amines having different basicity constants is disclosed. The more reactive amine is converted to a salt which is extracted with water in a multiple stage countercurrent extractor. The salt form of the amine is converted to the free amine. In a preferred aspect of the invention the amine salt is an amine sulfite which can be converted to free amine and sulfur dioxide. The sulfur dioxide can be reused to generate more amine sulfite. The more reactive amine is then separated from the water and part of it recovered. The remainder of the more reactive amine is recycled to the countercurrent extractor. The less reactive amine is removed from the countercurrent extractor in the free amine state as an organic phase along with any organic solvent that is used. Part of the less reactive amine is recovered from the system while the remainder is converted to a salt and an aqueous solution thereof recycled to the countercurrent extractor.

REFERENCES:
patent: 1663251 (1928-03-01), Gubelmann et al.
patent: 1884776 (1932-10-01), Lubs et al.
patent: 1998795 (1935-04-01), Tinker et al.
patent: 2009757 (1935-07-01), Bentley et al.
patent: 2031666 (1936-02-01), Perkins
patent: 2069546 (1937-02-01), Carswell
patent: 2732393 (1956-01-01), Hardy
patent: 4174351 (1979-11-01), Shoffner
Dissociation Extraction Part I: General Theory, Anwar, et al., Trans., Instn. Engrs., vol. 49, 1971.
Separation of Close Boiling Substituted Phenols by Dissociation Extraction, Wadekar, et al., J. Chem. Tech. Biotechnol. 31, pp. 279-284 (1981).

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