As per patent office journal dated 23/07/2021, patent number 372057 has been granted to E I DU PONT DE NEMOURS and ARCHER DANIELS MIDLAND COMPANY that is titled PROCESSES FOR PRODUCING 2,5-FURANDICARBOXYLIC ACID AND DERIVATIVES THEREOF AND POLYMERS MADE THEREFROM.
The primary independent claim of this patent states an integrated process for producing 2,5-furandicarboxylic acid and/or a derivative thereof from a six-carbon sugar-containing feed that is dehydrated in the presence of a bromine source and of a solvent, at an elevated temperature and for a time sufficient to generate an oxidation feed of at least one of 5-hydroxymethylfurfural and/or a derivative or derivatives of 5-hydroxymethylfurfural in the solvent, together with at least one bromine containing species and contacting the oxidation feed with a homogenous metal catalyst based on Co and Mn and with an oxygen source at an elevated temperature for a time sufficient to produce an oxidation product mixture of 2,5-furandicarboxylic acid (FDCA) and/or a derivative thereof, the solvent, and a residual catalyst. Further, this mixture is purified and separated to obtain FDCA and/or a derivative thereof and the solvent; and at least a portion of the solvent obtained is then recycled, wherein each optionally present derivative is at least one selected from the group consisting of diacid, diether, diester, ether-acid, ether-ester, ester-acid, ester-aldehyde, ether-aldehyde, ether-acetal, ester-acetal, acetal-acid, alcohol-acid, alcohol-ester, alcohol-acetal, diol, diacetal, and aldehyde-acetal.
During the patent prosecution, the patent examiner objected to this patent under section 3(d) of the Indian Patents Act. The patent applicant responded to this objection by stating that the present invention is novel and is not published in any of the prior arts. In view of this, the present claimed process is a novel process and does not fall within the ambit of Section 3 (d) of the Indian Patents Act, 1970.
This patent falls under the category of Chemical. Overall, this patent covers the process for producing 2,5-furandicarboxylic acid and derivatives thereof and polymers made therefrom. The process includes dehydration of a feed comprising a six-carbon sugar unit, in the presence of a bromine source and of a solvent, to generate an oxidation feed comprised of at least one of 5-hydroxymethylfurfural and/or a derivative or derivatives of 5-hydroxymethylfurfural in the solvent, together with at least one bromine containing species and contacting the oxidation feed with a homogenous metal catalyst based on Co and Mn and with an oxygen source at an elevated temperature for a time sufficient to produce an oxidation product mixture of 2,5-furandicarboxylic acid (FDCA) and/or a derivative thereof, the solvent, and a residual catalyst. Further, this mixture is purified and separated to obtain FDCA and/or a derivative thereof and the solvent; and at least a portion of the solvent obtained is then recycled.
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