Discussion on the Y-type distillation column technology invented by German Linde

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Dear sea friends: Recently, I consulted a senior engineer who has worked at Linde for many years, and learned about the definition of a Y-type distillation column – namely, a configuration in which two distillation columns share one reboiler, which is what is referred to as a “Y”-type distillation column. I have a question I’d like to ask those who work in the chemical industry: why are two distillation towers combined and shared one reboiler? What is the reason for doing this? What are the benefits? Under what circumstances do we use this design? Traditionally, two distillation columns are used – one for removing the heavier components and the other for removing the lighter ones. With clear functions and well-defined roles, this approach facilitates the purification of the product. However, with the Y-type column technology, where the reboilers of the two columns share one another, isn’t it less convenient to have the two columns separated? In other words, when operating the plant, should the first column be started first; once it reaches the set parameters and stability is achieved, then should the second column be started, and after that, continuous discharge occur once the second column also reaches the set parameters and stability?