NL7703353A - Para:amino-azobenzene prodn. - by reacting excess aniline with an alkali nitrite in hydrochloric acid medium contg. dissolved oxygen - Google Patents

Para:amino-azobenzene prodn. - by reacting excess aniline with an alkali nitrite in hydrochloric acid medium contg. dissolved oxygen

Info

Publication number
NL7703353A
NL7703353A NL7703353A NL7703353A NL7703353A NL 7703353 A NL7703353 A NL 7703353A NL 7703353 A NL7703353 A NL 7703353A NL 7703353 A NL7703353 A NL 7703353A NL 7703353 A NL7703353 A NL 7703353A
Authority
NL
Netherlands
Prior art keywords
contg
prodn
azobenzene
para
amino
Prior art date
Application number
NL7703353A
Other languages
Dutch (nl)
Original Assignee
Akzo Nv
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 Akzo Nv filed Critical Akzo Nv
Priority to NL7703353A priority Critical patent/NL7703353A/en
Publication of NL7703353A publication Critical patent/NL7703353A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B37/00—Azo dyes prepared by coupling the diazotised amine with itself

Abstract

Aminoazobenzene (I) is made by reacting excess aniline at 100 degrees C with an alkali nitrite in HCl medium contg. >=30 ppm dissolved elementary O2, and allowing the diazoaminobenzene cpd. formed to isomerise in the same soln. The reaction mixt. is then neutralised with caustic alkali and the aq. phase is sepd. from the organic phase contg. the (I) dissolved in aniline. The required dissolved O2 level can be achieved e.g. by carrying out the reaction under air at a pressure of >=2 atmos. or under a protective gas contg. >=40 vol. % O2, or by bubbling a protective gas contg. >=40 vol. % O2 through the reaction medium. The presence of O2 in the reaction medium reduces the formation of by-prods. such as o-aminobenzene, diphenylamine, 2-, 3- and 4-aminobiphenyl and 'diazo tars', and gives (I) of high purity. (I) is suitable for hydrogenation into p-phenylenediamine, which is a useful raw material in the mfr. of aromatic fibre-forming polyamides.
NL7703353A 1977-03-29 1977-03-29 Para:amino-azobenzene prodn. - by reacting excess aniline with an alkali nitrite in hydrochloric acid medium contg. dissolved oxygen NL7703353A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7703353A NL7703353A (en) 1977-03-29 1977-03-29 Para:amino-azobenzene prodn. - by reacting excess aniline with an alkali nitrite in hydrochloric acid medium contg. dissolved oxygen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7703353A NL7703353A (en) 1977-03-29 1977-03-29 Para:amino-azobenzene prodn. - by reacting excess aniline with an alkali nitrite in hydrochloric acid medium contg. dissolved oxygen

Publications (1)

Publication Number Publication Date
NL7703353A true NL7703353A (en) 1978-10-03

Family

ID=19828260

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7703353A NL7703353A (en) 1977-03-29 1977-03-29 Para:amino-azobenzene prodn. - by reacting excess aniline with an alkali nitrite in hydrochloric acid medium contg. dissolved oxygen

Country Status (1)

Country Link
NL (1) NL7703353A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4376730A (en) 1981-03-13 1983-03-15 Akzo N.V. Preparation of p-aminoazo-benzene from aniline
EP0035815B1 (en) * 1980-03-12 1983-06-08 Akzo N.V. Process for the preparation of p-aminoazobenzene from aniline

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035815B1 (en) * 1980-03-12 1983-06-08 Akzo N.V. Process for the preparation of p-aminoazobenzene from aniline
US4376730A (en) 1981-03-13 1983-03-15 Akzo N.V. Preparation of p-aminoazo-benzene from aniline

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Legal Events

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BV The patent application has lapsed