1. A process for preparing aminobenzoic acid or an aminobenzoic acid derivative, comprising:
(I) fermenting a raw material with microorganisms, said raw material comprising at least one fermentable carbon-containing compound, wherein an aminobenzoate- and/or aminobenzoic-acid-comprising fermentation broth is obtained;
(II) optionally, pretreating the fermentation broth obtained in step (I), said pretreatment comprising
the microorganism from the fermentation broth obtained in (I) without pH adjustment, wherein a microorganism-depleted fermentation broth is obtained,
and/or
(2) decoloring the fermentation broth obtained in (I) or, when carrying out (II)(1), of the microorganism-depleted fermentation broth obtained in (II)(1), without pH adjustment;
(III) treating the fermentation broth obtained in (I) or (II)(1) or (II)(2), in one-step with acid in a reactor to precipitate aminobenzoic acid from the fermentation broth;
(IV) isolating the aminobenzoic acid precipitated in (III), wherein mother liquor remains;
(V) optionally further purifying the aminobenzoic acid from (IV);
(VI) optionally further converting the aminobenzoic acid obtained in (IV) or (V) to form an aminobenzoic acid derivative;
wherein (III) is carried out in the presence of seed crystals of aminobenzoic acid.