Semi-batch distillation (SBD) differs from the batch distillation (BD) in that one part of the feed is continuously fed. The liquid volume in the reboiler has usually a minimum value because of different reasons. The application of semi-batch distillation might be advantageous in cases where the prescribed purity of the less (B) or the loss permitted of the more volatile (A) component... https://www.roneverhart.com/Mike-and-Ike-Italian-Ice-Candy-5-Ounce-Packs-12-Piece-Box/