There is a hydrogenation reaction in the distillation tower
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When simulating a distillation column, there is a reaction taking place; in practice, a hydrogenation reaction is carried out at the upper part of the column while distillation occurs at the lower part. However, the simulation never converges. I don’t know what’s going on. I would appreciate some guidance from an expert.
Is this equivalent to catalytic distillation, where catalysts are placed in the distillation tower to facilitate reactions?
Reply to 2# lbaizyh: Yes, indeed; lbaizyh is an expert. Could you give me some advice? Thank you!
I’ve only heard of it; I’ve never done it myself. It seems that it’s usually the catalyst manufacturers who handle it
Reply to 4# lbaizyh: Oh, I see. Hehe, thanks. Looking forward to answers from more knowledgeable people
The hydrogenation process mainly involves the type and performance of catalysts; it seems that there is no such specialized hydrogenation reactor in PROII. Logistic balance can only be simulated by interrupting the logistics flow, using a logistics calculator for simulation, with the specific flow rates determined based on the data provided by the catalyst factory. I’m also just starting to work with this; I don’t understand it very well. I think the issue of non-convergence mentioned by the original poster might be due to the presence of circulating hydrogen in the simulation, along with the use of a controller; the precision of this controller should be set at 0.0001, rather than the default value of 0.001. In that case, the distillation towers afterward should converge. If it’s as I said, it should basically be this problem
Reply to 5# peixuemei: There are many reasons why convergence does not occur; it is not necessarily related to the addition of reactants. Factors such as whether the settings are appropriate, whether the reaction conditions are correctly specified, whether the methods used are proper, whether the product requirements are too stringent, whether the temperature and pressure distributions are suitable, and whether the number of theoretical plates and the reflux ratio are sufficient also play a role. . . It’s better to specify the exact process in order to help you. It is recommended that you upload the INP file or send it to my email address shanpengfei9999@163.com so that I can take a look at it for you. . .
The original poster is also studying reactive distillation simulation; my QQ number is 406253127. We can exchange ideas there