NOVELTY - A light naphtha of 4-6 carbon-containing n-alkane, isopentane, and hexane is extracted by subjecting 4-6 carbon-containing isoparaffin mixed raw material from raw material storage tank (V3) into 1st adsorption tower (T1) to gasify, absorbing n-alkane, subjecting unabsorbed component into top 1st adsorption tower (T1), regenerating pressure completion of 2nd absorption tower (T2), performing adsorption and desorption in 1st adsorption tower (T1), subjecting pressure drop into 3rd adsorption tower (T3), replacing material with inert gas, condensing, desorbing, and rectifying.    USE - Extraction of light naphtha of carbon-containing n-alkane, isopentane, and hexane (claimed).    ADVANTAGE - Extraction process has effective separation and high product purity, and adsorbent regeneration is easy, simple, and reduces energy consumption.    DETAILED DESCRIPTION - A light naphtha of 4-6 carbon-containing n-alkane, isopentane, and hexane is extracted by subjecting 4-6 carbon-containing isoparaffin mixed raw material from raw material storage tank (V3) into 1st adsorption tower (T1) to gasify, absorbing n-alkane, subjecting unabsorbed component into top 1st adsorption tower (T1), regenerating pressure completion of 2nd absorption tower (T2), performing adsorption and desorption in 1st adsorption tower (T1), subjecting pressure drop into 3rd adsorption tower (T3), replacing material with inert gas in 1st adsorption tower (T1), obtaining middle distillate by condensation, desorbing, mixing completely 7-9 carbon-containing alkane or mixture replaced by gasification in 1st adsorption tower (T1), desorbing adsorbed 4-6 carbon-containing n-alkane, subjecting desorbed material into rectification tower (T6), increasing pressure, equalizing pressure of 3rd adsorption tower (T3) and 1st adsorption tower (T1), regenerating layer, subjecting into 4th absorbing tower (T4) and not adsorbing isoparaffin, subjecting into 1st adsorption tower (T1) as regenerating agent, performing adsorption of 7-9 carbon-containing n-alkane to achieve regeneration of adsorbent in 1st adsorption tower (T1), subjecting obtained regenerated material into 1st rectification tower (T5), performing adsorption and desorption of material fed from 1st adsorption tower (T1) into 2nd rectification tower (T6), obtaining 4-6 carbon-containing n-alkane in top of tower, obtaining desorbing agent 7-9 consisting of carbon-containing n-alkane in bottom of tower, recycling 7-9 carbon-containing n-alkane, subjecting regenerative material from 1st adsorption tower (T1) into 1st rectification tower (T5), obtaining isoparaffin from top of tower, obtaining desorbing agent tower consisting of 7-9 carbon-containing n-alkane from bottom of tower, recycling, subjecting 4-6 carbon-containing isoparaffin into 3rd rectification tower (T7), and rectifying.