Process for producing adipic acid crystals from a solution of adipic acid, comprising at least one step of purification by crystallization and one step of separation and recovery of the adipic acid crystals, characterized in that the adipic acid crystals are subjected, before the separation and recovery step, to a grinding phase, in that the step of purification by crystallization and of separation and recovery of the adipic acid crystals comprises the following steps: - a crystallization phase in a crystallizer optionally comprising an external circulation loop of the crystallization medium, by cooling and/or by concentrating a solution of adipic acid; - optionally a phase of separation of the crystals formed; - optionally a phase of repulping the crystals in a liquid medium saturated with adipic acid; - a phase of separation and recovery of the crystals, optionally with washing of the crystals; and in that - when a single step of purification by crystallization and of separation and recovery of the adipic acid crystals is used, the grinding phase, before the phase of separation and recovery of the crystals, is carried out on at least one of the following media: ∘ on the suspension of crystals contained in the crystallizer and circulating in the optional loop external to the crystallizer with recycling of this suspension containing the ground crystals into the crystallizer; ∘ on the crystals contained in the medium of the optional repulping phase; ∘ on the wet crystals after the optional repulping phase; - when at least two successive steps of purification by crystallization and of separation and recovery of the adipic acid crystals are carried out, the grinding phase, before the phase of separation and recovery of the crystals, is carried out, at at least any one of the steps preceding the last step of purification by crystallization and of separation and recovery of the adipic acid crystals and/or during the last step of purification by crystallization and of separation and recovery of the adipic acid crystals, on at least one of the following media: ∘ on the suspension of crystals contained in the crystallizer and circulating in the optional loop external to the crystallizer with recycling of this suspension containing the ground crystals into the crystallizer; ∘ on the crystals contained in the medium of the optional repulping phase; ∘ on the wet crystals after the optional repulping phase. - a crystallization phase in a crystallizer optionally comprising an external circulation loop of the crystallization medium, by cooling and/or by concentrating a solution of adipic acid; - optionally a phase of separation of the crystals formed; - optionally a phase of repulping the crystals in a liquid medium saturated with adipic acid; - a phase of separation and recovery of the crystals, optionally with washing of the crystals; - when a single step of purification by crystallization and of separation and recovery of the adipic acid crystals is used, the grinding phase, before the phase of separation and recovery of the crystals, is carried out on at least one of the following media: ∘ on the suspension of crystals contained in the crystallizer and circulating in the optional loop external to the crystallizer with recycling of this suspension containing the ground crystals into the crystallizer; ∘ on the crystals contained in the medium of the optional repulping phase; ∘ on the wet crystals after the optional repulping phase; ∘ on the suspension of crystals contained in the crystallizer and circulating in the optional loop external to the crystallizer with recycling of this suspension containing the ground crystals into the crystallizer; ∘ on the crystals contained in the medium of the optional repulping phase; ∘ on the wet crystals after the optional repulping phase; - when at least two successive steps of purification by crystallization and of separation and recovery of the adipic acid crystals are carried out, the grinding phase, before the phase of separation and recovery of the crystals, is carried out, at at least any one of the steps preceding the last step of purification by crystallization and of separation and recovery of the adipic acid crystals and/or during the last step of purification by crystallization and of separation and recovery of the adipic acid crystals, on at least one of the following media: ∘ on the suspension of crystals contained in the crystallizer and circulating in the optional loop external to the crystallizer with recycling of this suspension containing the ground crystals into the crystallizer; ∘ on the crystals contained in the medium of the optional repulping phase; ∘ on the wet crystals after the optional repulping phase. ∘ on the suspension of crystals contained in the crystallizer and circulating in the optional loop external to the crystallizer with recycling of this suspension containing the ground crystals into the crystallizer; ∘ on the crystals contained in the medium of the optional repulping phase; ∘ on the wet crystals after the optional repulping phase.