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Method and apparatus for purifying olefin

A method of olefin purification which is for purifying a C 2-6 olefin contained in a raw material comprising the olefin and a C 2-6 paraffin. In an absorption column (1), a first step is conducted in which the raw material is brought into contact with a solution containing silver ions (absorbing solution) at a given temperature and a given pressure to cause the absorbing solution to preferentially absorb the olefin contained in the raw material and, simultaneously with the contact, an unabsorbed gas which was not absorbed by the absorbing solution is discharged. In a stripping column (2), a second step is conducted in which the absorbing solution which has undergone the first step is stripped at a given temperature and a given pressure to remove and recover the gaseous ingredient from the absorbing solution. The absorbing solution is circulated between the first step and the second step, and the first step and the second step are continuously conducted simultaneously.