GB191409269A - Manufacture of Finely Subdivided Vat Dyestuffs of the Dihydro-1:2:2:1-anthraquinoneazine Series. - Google Patents

Manufacture of Finely Subdivided Vat Dyestuffs of the Dihydro-1:2:2:1-anthraquinoneazine Series.

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Publication number
GB191409269A
GB191409269A GB191409269DA GB191409269A GB 191409269 A GB191409269 A GB 191409269A GB 191409269D A GB191409269D A GB 191409269DA GB 191409269 A GB191409269 A GB 191409269A
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United Kingdom
Prior art keywords
dye
acid
sulphate
vat
sulphuric acid
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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Inventor
Oliver Imray
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of GB191409269A publication Critical patent/GB191409269A/en
Expired legal-status Critical Current

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  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

Abstract

9269. Imray, O., [Farbwerke vorm. Meister, Lucius, & Br³ning]. April 14. Anthraquinonehydroazines.-Vat dyes of the diliydro-1: 2 : 2<1> : 1<1>-anthraquinoneazine series are converted into a finely-divided or amorphous form by treatment with sulphuric acid under such conditions that the dye remains undissolved either as free base or as sulphate; if the sulphate is formed it is dissociated by adding water. If crude vat dye is treated by the process, it may be simultaneously purified from flavanthrene &c. which dissolve in the acid. Suitable dyes for treatment are indanthrene RS or GC, the crude vat dye obtained from the alkali melts, or the coarsely-subdivided forms obtained by blowing air into a vat of the dye, or by dissolving the dye in sulphuric acid and precipitating with water. The process can be carried out by treatment with a . suitable quantity of sulphuric acid monohydrate, fuming sulphuric acid or acid of 60-66‹ BÚ., and then dissociating the sulphate with water; or a weaker acid may be used which does not yield the sulphate, and the separated dye then washed free from acid; or highly concentrated acid may be first used and the mass be then diluted with a little water, so that the impurities remain in solution, white the dye or its sulphate is separated. The production of the finely-divided state may be assisted by the addition of aromatic acids, sodium benzylsulphanilate, &c. Specifications 18,761/10, 20,324/10, and 18,589/11 are referred to. The products are suitable for use in printing or as pigment dyes.
GB191409269D 1914-04-14 1914-04-14 Manufacture of Finely Subdivided Vat Dyestuffs of the Dihydro-1:2:2:1-anthraquinoneazine Series. Expired GB191409269A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191409269T 1914-04-14

Publications (1)

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GB191409269A true GB191409269A (en) 1915-07-22

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ID=32647789

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Application Number Title Priority Date Filing Date
GB191409269D Expired GB191409269A (en) 1914-04-14 1914-04-14 Manufacture of Finely Subdivided Vat Dyestuffs of the Dihydro-1:2:2:1-anthraquinoneazine Series.

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GB (1) GB191409269A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2475821A (en) * 1944-03-13 1949-07-12 American Cyanamid Co Acid treatment of thionaphthene vat dyestuffs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2475821A (en) * 1944-03-13 1949-07-12 American Cyanamid Co Acid treatment of thionaphthene vat dyestuffs

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