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2 149 157

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C1

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IPC

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Application

93001121/04, 1993-01-06

(22)

Actual filing date

1993-01-06

(45)

Published

2000-05-20

(72)

Inventor

Ermakov A.A.Nazarov V.I.Polomarchuk N.I.Jagofarova L.V.Globin V.A.Zheleznjak V.Ja.Terent'Ev V.S.Astaf'Ev P.M.

(73)

Holder

Ermakov Anatolij Aleksandrovich

METHOD OF PREPARING PURIFIED 2,4-DICHLOROPHENOXYLACETIC ACID Russian patent published in 2000 - IPC

Abstract RU 2149157 C1

FIELD: chemical industry. SUBSTANCE: described is method of preparing purified 2,4-dichlorophenoxyacetic acid by condensation of industrial 2,4-dichlorophenol with monochloroacetic acid in alkaline medium followed by acidification of reaction mixture in the presence of solvent during heating operation and recovery of the desired product by crystallization during cooling operation. Acidification is carried out in the presence of organic solvent such as perchloroethylene or toluene from which the desired product is isolated by crystallization when cooled to 5-30 C. EFFECT: simplified technology of the process. 4 ex, 1 tbl

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RU 2 149 157 C1

Authors

Ermakov A.A.

Nazarov V.I.

Polomarchuk N.I.

Jagofarova L.V.

Globin V.A.

Zheleznjak V.Ja.

Terent'Ev V.S.

Astaf'Ev P.M.

Dates

2000-05-20—Published

1993-01-06—Filed

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