Patent ID: 8785710

Claim:
A paraffin purification method for purifying a paraffin from a source material, comprising: introducing a source material comprising no less than 90 mol % of a paraffin having 2 to 6 carbon atoms as a main component and an olefin having 2 to 6 carbon atoms as an impurity at a bottom portion of an absorption column; contacting the source material with an absorption liquid containing a silver ion at a first temperature and a first pressure, wherein the olefin is absorbed by the absorption liquid to produce a used absorption liquid; recovering the paraffin that is not absorbed by the absorption liquid via a gas drawing tube connected to a top of the absorption column; introducing the used absorption liquid to a desorption column for desorbing and discharging the olefin at a second temperature and a second pressure to produce a regenerated absorption liquid; and returning the regenerated absorption liquid to the absorption column through a return piping that is connected to the desorption column and to the gas drawing tube, wherein the absorption and the desorption of the olefin are performed continuously in parallel while the used and regenerated absorption liquids are circulated between the absorption column and the desorption column; and wherein the absorption liquid contains no absorption-assisting component other than the silver ion.