GB240168A - Manufacture of blue dyestuff - Google Patents

Manufacture of blue dyestuff

Info

Publication number
GB240168A
GB240168A GB23246/25A GB2324625A GB240168A GB 240168 A GB240168 A GB 240168A GB 23246/25 A GB23246/25 A GB 23246/25A GB 2324625 A GB2324625 A GB 2324625A GB 240168 A GB240168 A GB 240168A
Authority
GB
United Kingdom
Prior art keywords
sulphuric acid
dihydroanthraquinoneazine
heated
acid
product
Prior art date
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
Application number
GB23246/25A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of GB240168A publication Critical patent/GB240168A/en
Expired legal-status Critical Current

Links

Abstract

Pure N-dihydroanthraquinoneazine, obtainable according to Specification 184,193, is heated with concentrated sulphuric acid with or without boric acid; the product dyes cotton from the vat in shades which are brighter and faster to chlorine than those yielded by the product obtained from non-purified N-dihydroanthraquinoneazine. The process may be modified by combining the purification of the parent dyestuff and the heating with sulphuric acid into a single operation; in the latter case the crude N-dihydroanthraquinoneazine is heated with concentrated sulphuric acid and boric acid, the mass diluted by addition of weaker sulphuric acid and the product filtered; it may be further purified by fractional precipitation from sulphuric acid. Specifications 339/09 and 23875/09 are referred to.
GB23246/25A 1924-09-20 1925-09-17 Manufacture of blue dyestuff Expired GB240168A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE240168X 1924-09-20

Publications (1)

Publication Number Publication Date
GB240168A true GB240168A (en) 1926-07-15

Family

ID=5904787

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23246/25A Expired GB240168A (en) 1924-09-20 1925-09-17 Manufacture of blue dyestuff

Country Status (1)

Country Link
GB (1) GB240168A (en)

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