The present invention relates to a process for preparing furan-2,5-dicarboxylic acid (FDCA) by converting furan-2,5-dicarboxylate salt (MFDC) to furan-2,5-dicarboxylic acid (FDCA) - Solid MFDC and inorganic acid (HY) are mixed to form a solution containing a solid FDCA in a concentration of 1 to 15% by weight in a solution of a salt of furan-2,5-dicarboxylate salt and an anion of inorganic acid (MY solution) Forming a reaction mixture, Separating the solid FDCA from the reaction mixture in a solid-liquid separation step, and - providing at least 40 vol% of the MY solution obtained from the solid-liquid separation step to the mixing step of MFDC and HY The method comprising: The step of providing a portion of the MY salt solution obtained from the solid-liquid separation step to the mixing step of MFDC and HY enables a stable and economical process to obtain the FDCA product with excellent quality and high yield.
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