| 摘要 |
PURPOSE:To obtain a vat dye of good quality in a high yield, by chlorinating a specified condensation product obtd. by a reaction in the presence of 1,3-dimethyl-2-imidazolidinone. CONSTITUTION:0.1-10pts.wt. alkaline condensing agent such as KOH and optionally a wetting agent such as an alkali metal naphthalenesulfonate are added to one pt. 1-aminoanthraquinone in the form of a powder or a slurry while introducing an oxidizing agent such as air. A condensation reaction is conducted in the presence of 0.1-10pts.wt. 1,3-dimethyl-2-imidazolidinone at 80-150 deg.C to obtain a condensation reaction product. The product is slurried in water and reduced with hydrotalcite in the presence of an alkali metal hydroxide. The resulting crystal is recovered by filtration and slurried in water. The resulting dianthraquinone-N,N-dihydroamine or the above product is chlorinated in sulfuric acid. The product is recovered by filtration and the filter cake is completely dissolved in 98% sulfuric acid and reduced with Al powder to obtain a vat dye of the formula, wherein n is 1, 2.
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