Acesulfame potassium is a calorie-free artificial sweetener, also known as Acesulfame K or Ace K. Acesulfame potassium is a calorie-free artificial sweetener, also known as Acesulfame K or Ace K, and marketed under the trade names Sunett and Sweet One. In the European Union, it is known under the E number (additive code) E950. In chemical structure, acesulfame potassium is the potassium salt of 6 ...