MUMBAI, India, Oct. 24 -- Intellectual Property India has published a patent application (202421031421 A) filed by Finorchem Limited, Ankleshwar, Gujarat, on April 19, 2024, for 'an efficient process for 4-adpa and its in-situ usage for production of 6ppd with superior antiozonant properties.'
Inventor(s) include Narain Holani; R B Vishwanath; Rajeev Chauhdray; and Kaushtav Banerjee.
The application for the patent was published on Oct. 24, under issue no. 43/2025.
According to the abstract released by the Intellectual Property India: "An efficient process for 4-ADPA and its in-situ usage for production of 6PPD with superior antiozonant properties The present invention discloses an efficient process for the preparation of N-(1,3-dimethylbutyl)-N'-phenyl-1,4-benzenediamine (6PPD). The process comprises treating aniline with a base to obtain a mixture containing reactive anilide; treating the mixture obtained in step (a) with nitrobenzene to obtain a reaction mixture comprising 4- NODPA, 4- NDPA and side products comprising azobenzene and phenazine; treating the reaction mixture of step (b) with a hydrogenation catalyst at a temperature 50 0C to 90 C and between 10 kg/cm2 to 25 kg/cm2 Hydrogen pressure to obtain 4- aminodiphenylamine; treating 4- aminodiphenylamine with Methyl isobutyl ketone in the presence of a hydrogenation catalyst to obtain the N-(1,3-dimethylbutyl'-N'-phenyl-1,4-benzenediamine. The process of the invention is an energy efficient, commercially viable and green process for the preparation of 6PPD wherein the process provides 6PPD in high yield, higher purity with minimal formation of side products, in particular phenazine, tars and azobenzene is minimal."
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