Process for preparing detergent composition particles

Process for preparing detergent composition particles comprising sodium carbonate or bicarbonate particles loaded by incorporation of at least one detergent component according to which at least one detergent component is contacted in liquid state with reactive particles comprising at least 60% in weight sodium carbonate or bicarbonate, the contacting resulting in at least partial incorporation, said reactive particles having been obtained by a process comprising the steps of: - (a) adding at least one alkali metal carbonate to an aqueous solution in order to form an aqueous composition; wherein the alkali metal carbonate comprises sodium carbonate and wherein the aqueous composition comprises at least one polycarboxylic acid and/or the salts thereof, in an amount of at least 200 ppm based on the weight of the aqueous composition; and - (b) separating sodium bicarbonate starting from the aqueous composition, in order to obtain sodium bicarbonate particles, on one hand, and an aqueous mother liquor, on the other hand - (c) optionally calcining at a temperature of at least 80°C the sodium bicarbonate particles in order to transform them into sodium carbonate particles.