Method for recovering antipyrine from mother solution after crystallization of antipyrine crude oil

The invention discloses a method for recovering antipyrine from a mother solution after crystallization of antipyrine crude oil. The method sequentially comprises the steps of concentrating, decoloring, cooling and crystallizing, re-crystallizing, refining, centrifuging and drying, wherein the re-crystallizing procedure is realized by adopting the following steps of: re-dissolving concentrated crystals obtained in the cooling and crystallizing procedure by using alcohol, then adding active carbon in a re-dissolved solution while raising the temperature to 55-65 DEG C, wherein the weight ratio of the active carbon to the concentrated crystals is 1:(180-220), continuously raising the temperature to 75-85 DEG C, insulating heat for 25-40min and then filtering, cooling filtrate and insulating heat for 8-15min after the crystals occur, continuously cooling to 10-15 DEG C and then centrifuging to obtain an antipyrine re-crystallized product; and refining, centrifuging and drying the re-crystallized product to obtai