Propane and isobutane production technologies

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Hello everyone: Our company plans to use an idle atmosphere treatment unit to produce propane and isobutane. The process involves feeding the unreacted C4 compounds from the top of the MTBE azeotrope tower, along with those from the bottom of the propylene column in another atmosphere treatment unit, into the propane column. Propane, propylene, and other components are obtained from the top of this column and sent to the ethane column, while propylene is obtained from the top of that column, and propane is obtained from the bottom of it. The material from the bottom of the propane column enters the propylene column; isobutane is obtained from the top of the column, while liquefied gas is obtained from the bottom of the column. Dear colleagues, do any of you know any better methods for extracting propane and isobutane through industrial processes?