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Application

99125679/04, 1999-12-03

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Start date

1999-12-03

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Actual filing date

1999-12-03

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Published

2000-12-27

(72)

Inventor

Kulinich V.P.Majzlish V.E.Shaposhnikov G.P.Lutsenko O.G.

(73)

Holder

Ivanovskij Gosudarstvennyj Khimiko-Tekhnologicheskij Universitet

METHOD OF PREPARING HALOGENSULFOPHTHALIC ACIDS Russian patent published in 2000 - IPC

Abstract RU 2161151 C1

FIELD: synthesis of tetrahalogentetrasulfophthalo cyanines. SUBSTANCE: described is method of preparing halogensulfophthalic acid salts by sulfonation of halogen substituted aromatic compounds followed by neutralization of excessive amount of sulfuric acid wherein 4-halogenphthalimides, sulfonation is carried out with 20-30 % oleum at 200-210 C for 6-7 h and the product is recovered by conversion of calcium salt into corresponding halogensulfophthalic acid salt directly after neutralization of excessive amount of sulfuric acid. Invention makes it possible to increase yield of the product by more than 6 times, simplify the process and prepare products when using them to synthesize corresponding complexes of tetrahalogentetrasulfophthalo cyanines of high purity. EFFECT: more efficient preparation method. 2 tbl

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RU 2 161 151 C1

Authors

Kulinich V.P.

Majzlish V.E.

Shaposhnikov G.P.

Lutsenko O.G.

Dates

2000-12-27—Published

1999-12-03—Filed

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