Question: A two-product distillation tower with a single feed is considered in this question.
(a) Sketch two types of condensers (showing equipment and valves), de scribe their physical principles, and be sure to explain how the duty is adjusted for process control.
(b) Repeat (b) for reboilers.
(c) Discuss why distillation towers typically have an overhead liquid accumulator.
(d) Discuss why temperatures and pressures are measured on selected distillation trays.
(e) Where would you place safety valves and for what maximum flow should they be sized? (f) Identify possible constraints (i.e., items that define the frame of the operating window).
(g) Identify potential disturbances.
(h) The composition sensors often provide new measurements only every two minutes. Give a reason why this might occur.
(i) Identify all inventories in the distillation process, determine which are non-self-regulatory, and describe potential control strategies for each.
(j) Discuss options for product quality control and the interaction between inventory and product quality controls.