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Expired
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GB15644/23A
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Individual
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Individual
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Publication of GB199721ApublicationCriticalpatent/GB199721A/en
Aminoperylene quinones and their bromo derivatives are obtained by the reduction of the corresponding nitro compounds. According to the examples, a suspension of mono- or dinitroperylene quinone or of bromodinitroperylane quinone in caustic soda solution is heated with sodium bisulphite and a current of air then blown through the hot liquid to precipitate the amino compound, which is recrystallized from hot aniline or nitrobenzene. Diaminoperylene quinone and its bromo derivative dye cotton violet from the vat. Specification 199,720 is referred to.
GB15644/23A1922-06-201923-06-15Process of manufacturing amino perylene quinones
ExpiredGB199721A
(en)