Solution to injection chemistry problems
Thread Content
1. The packing layer height of a certain packed distillation column is 9 m. There is a degasifier at the top of the column and a reboiler at the bottom. It is known that 18 theoretical plates are required for the distillation column system to complete the separation process. What is the equivalent plate height (in meters) of this column? A. 2. B. 0.56 C. 0.52 D. 0.5 2. Which of the following operating conditions is suitable for using a vertical thermosyphon reboiler? A. Media with high viscosity and a tendency toward having a specific structure. B. Operating conditions that require a high vaporization rate (vaporization rate > 80%). C. Operating conditions that demand a high heat transfer coefficient, but do not require a very high vaporization rate. D. Conditions that allow for a longer residence time in the heating zone
Are the answers to these two questions both C? The word count limit is so annoying; I have to make sure there’s enough words. Ugh
1. The calculation shows that 18 theoretical plates are required; since both the fractionator and the reboiler each equate to one tower plate, 16 additional plates are needed. 9m divided by 16 equals 0.56. . I’m not sure if it’s correct
Analysis: For the first question, the splitter is equivalent to one theoretical plate; the reboiler is not counted. Therefore, there are a total of 17 theoretical plates in the distillation section and the stripping section, and the plate height is 9/17 = 0.529. For the second question, the elimination method can be used: A has high viscosity and requires forced transportation via a pump; B has a vaporization rate of generally no more than 30%; D allows for a short residence time in the heating zone. Is everyone correct?
Both the fractionator and the reboiler function like a single tray, so 16 trays are sufficient. Supports 3rd floor
Siphon heat exchangers rely on thermodynamic flow; the deltaP is small, the flow velocity should be low, and the residence time is long. Answer D should be correct!