Route of the thermal solvent cycle for butadiene extraction using the ACN method
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In my plant, the solvent circulation path is as follows: the fluid from the bottom of the stripping tower passes through the intermediate reboiler of the first extraction tower for heat exchange, then goes to the reboiler at the bottom of the degassing tower for further heat exchange, after which it proceeds to the feed evaporator before returning to the solvent tank. However, in another setup I’ve seen, the fluid from the bottom of the stripping tower passes through the intermediate reboiler of the first extraction tower for heat exchange, then goes to the feed evaporator first for heat exchange, after that it goes to the reboiler at the bottom of the degassing tower for more heat exchange, before returning to the solvent tank. Please tell me what the differences are between these two processes, as well as their advantages and disadvantages ?
I think the first option is more reasonable; we will go with the first approach, as it allows us to make full use of the heat in the degassing tower, thereby reducing the amount of steam required by the steam reboiler in that tower