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 first concentrating process comprises: distilling a combined stream that comprises a mixture of the first feed stream and a recycle stream having primarily isopentane to produce a bottoms stream comprising primarily n-hexane, an intermediate stream comprising primarily n-pentane, and an overhead stream comprising primarily isopentane; combining the intermediate stream and the bottoms stream to produce the first product stream; isomerizing the overhead stream in a reactor to convert at least some of the overhead stream's isopentane to n-pentane; and distilling effluent from the reactor to form the recycle stream and the second product stream; wherein the first feed stream and/or the second feed stream comprises 85 mol. % to 95 mol. % n-pentane and isopentane collectively. 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 first concentrating process comprises: distilling a combined stream that comprises a mixture of the first feed stream and a recycle stream having primarily isopentane to produce a bottoms stream comprising primarily n-hexane, an intermediate stream comprising primarily n-pentane, and an overhead stream comprising primarily isopentane; combining the intermediate stream and the bottoms stream to produce the first product stream; isomerizing the overhead stream in a reactor to convert at least some of the overhead stream's isopentane to n-pentane; and distilling effluent from the reactor to form the recycle stream and the second product stream; wherein the first feed stream and/or the second feed stream comprises 85 mol. % to 95 mol. % n-pentane and isopentane collectively. distilling a combined stream that comprises a mixture of the first feed stream and a recycle stream having primarily isopentane to produce a bottoms stream comprising primarily n-hexane, an intermediate stream comprising primarily n-pentane, and an overhead stream comprising primarily isopentane; combining the intermediate stream and the bottoms stream to produce the first product stream; isomerizing the overhead stream in a reactor to convert at least some of the overhead stream's isopentane to n-pentane; and distilling effluent from the reactor to form the recycle stream and the second product stream; wherein the first feed stream and/or the second feed stream comprises 85 mol. % to 95 mol. % n-pentane and isopentane collectively.