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2 087 474

(13)

C1

(51)

IPC

(21) (22)

Application

94030298/04, 1994-08-16

(22)

Actual filing date

1994-08-16

(45)

Published

1997-08-20

(72)

Inventor

Boldyrev A.V.Kolbina V.N.Samsonov Eh.E.

(73)

Holder

Rossijskij Nauchnyj Tsentr Khimija"

METHOD OF RECOVERY OF TRIETHYLENE DIAMINE Russian patent published in 1997 - IPC

Abstract RU 2087474 C1

FIELD: organic chemistry, more particularly recovery of triethylene diamine from reaction mixtures. SUBSTANCE: after synthesis stage, catalysts are directed to rectification stage in which highly volatile impurities are removed in first stage, triethylene diamine is recovered in second stage in the form of azeotropic mixture by addition of azeotropic remover thereto. The azeotropic remover includes substances of aromatic hydrocarbons having boiling temperature of 155-195 C and/or acyclic hydrocarbons having boiling temperature of 150-210 C or mixture thereof with paraffin hydrocarbons having boiling temperature of 150-210 C. Triethylene diamine is recovered from azeotropic mixture by crystallization on cooling. The claimed method makes it possible to obtain highly pure (more than 99 wt%) at great recovery degree (80-90 wt% or more). The color of the product remains unchanged during storage and technological difficulties are avoided. EFFECT: more efficient recovery method. 1 tbl

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RU 2 087 474 C1

Authors

Boldyrev A.V.

Kolbina V.N.

Samsonov Eh.E.

Dates

1997-08-20—Published

1994-08-16—Filed

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