JPS6056699B
Highly pure p-phenylenediamine can advantageously be prepared on a commercial scale by separating and removing o-aminoazobenzene produced as a by-product in the step of producing p-aminoazobenzene, from the product mixture before p-aminoazobenzene is reduced in a process for preparing p-phenylenedia...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | Highly pure p-phenylenediamine can advantageously be prepared on a commercial scale by separating and removing o-aminoazobenzene produced as a by-product in the step of producing p-aminoazobenzene, from the product mixture before p-aminoazobenzene is reduced in a process for preparing p-phenylenediamine which comprises preparing p-aminoazobenzene from aniline by way of diazoaminobenzene and then reducing p-aminoazobenzene. |
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