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2 079 484

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C1

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IPC

(21) (22)

Application

94021677/04, 1994-06-08

(22)

Actual filing date

1994-06-08

(45)

Published

1997-05-20

(72)

Inventor

Samojlova G.E.Abradushkin Ju.S.Zolina N.V.

(73)

Holder

Moskovskoe Nauchno-Proizvodstvennoe Ob"Edinenie

METHOD FOR ISOLATION OF CHLORONITROANILINES Russian patent published in 1997 - IPC

Abstract RU 2079484 C1

FIELD: production of dyes, materials for motion picture and photography, pharmaceutical industry. SUBSTANCE: 2-chloro-5-nitroaniline or 4-chloro-3-nitroaniline being prepared by nitration of suitable origin chloroanilines and placed into ice water, ratio of reaction mass after nitration and water is maintained within 1.3-2.5:1.0. The process is followed by filtration and hydrolysis of precipitate which takes place by treatment with water at 55-95 C. Melting point of desired 2-chloro-5-nitroaniline and 4-chloro-3-nitroaniline is 117-118 C and 101-102 C respectively, mass portion of main material in it being 99.4% and 99%, respectively. EFFECT: simplified technology, increased yield of desired products.

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RU 2 079 484 C1

Authors

Samojlova G.E.

Abradushkin Ju.S.

Zolina N.V.

Dates

1997-05-20—Published

1994-06-08—Filed

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