Method for treating crude mother liquor in acesulfame potassium production

The invention relates to a method for treating crude mother liquor in acesulfame potassium production, which is characterized by comprising the following steps: (1) feeding the crude mother liquor into a mother liquor concentration kettle, adding activated carbon, controlling the volume-mass ratio of the crude mother liquor to the activated carbon to be (2-5) m < 3 >: 1Kg, the pressure to be (-0.06)-(-0.08) MPa and the temperature to be 60-85 DEG C, concentrating to 50-70% of the original volume, and then filtering; (2) feeding the filtrate into a crystallization kettle for cooling, and then centrifuging; and (3) adding the coarse mother liquor sugar obtained by centrifugation into a mother liquor sugar boiling kettle, adding the secondary mother liquor, deionized water and activated carbon, controlling the mass ratio of the coarse mother liquor sugar to the food-grade activated carbon to the secondary mother liquor to the deionized water to be (100-150): 1: (100-150): (20-30), controlling the temperature to