Process for npentanizing debutanized natural gasoline feedstock to thermal crackers

A method of increasing n-pentane concentration in debutanized natural gasoline, the method comprising:

• splitting a stream, comprising primarily n-pentane and isopentane collectively, into a first feed stream comprising primarily n-pentane and isopentane collectively and a second feed stream comprising primarily n-pentane and isopentane collectively;
• subjecting the first feed stream to a first concentrating process, the first concentrating process comprises distilling and produces a first product stream comprising primarily n-pentane and a second product stream comprising methane, ethane, and propane;
• and
• subjecting the second feed stream to a second concentrating process, the second concentrating process comprises simulated moving bed adsorbing to produce a third product stream comprising primarily n-pentane and a fourth product stream comprising primarily isopentane, wherein the second concentrating process comprises:
• feeding the second feed stream at a first port in a series of adsorbent columns;
• feeding an eluent at a second port in the series of adsorbent columns;
• removing raffinate from a third port in the series of adsorbent columns;
• removing extract from a fourth port in the series of adsorbent columns;
• and
• simulating switching location of the first port, second port, third port, and fourth port repeatedly amongst each other.