Extractive distillation calculation imbalance problem
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I discovered the following problems when simulating extraction and distillation of THF and methanol using DMSO.: 1. During the simulation, it is necessary to ensure that the THF content in the D1 stream of the T tower reaches 0.995. I set the design regulations of the T tower and let the S stream be used as a variable to ensure the THF content of D1. 2. Because the extraction agent DSMO will be lost, a mixer is designed to mix the circulating stream of the T2 tower with the supplementary extraction agent makeup. The make-up system uses the calculate in the flowsheet option to calculate that the make-up is equal to the value of the DSMO flowing out of D1 and D2. 3. After I set it up, I found that the materials before and after the mixer were unbalanced during the initial run, and the value of S was larger than the value of makeup plus circulating logistics. The question now is that I want to ensure the content of THF in D1 and also ensure the material balance. How should I deal with it? Please give me the answers
Remark: When I simulated, I first calculated the T tower and made design regulations, and then connected the T2 tower. After the operation was successful, I connected the circulating logistics and mixer, but problems occurred during operation.
This post was last posted by * amingteda edited on 2019-2-28 11:26 The amount of DMSO in this design is determined by whether the purity of THF in D1 can meet the standard. In theory, this is no problem, but in this case, how to set the reflux ratio and top extraction? This type of design first finds an extractant range that can make the D1 product meet the standard, determines the extractant value, and then uses the extraction volume and reflux ratio to make design regulations for the extraction tower and recovery tower, so as to obtain the extraction dose that needs to be supplemented.