Modified 5A molecular sieve used for removing small-amount n-hexane from isohexane and regeneration method thereof

Disclosed is a modified 5A molecular sieve used for removing small-amount n-hexane from isohexane. The 5A molecular sieve to be modified is soaked and dealuminized through the ethanol solution of oxalic acid, and the modified 5A molecular sieve is obtained accordingly. Meanwhile, the invention discloses a regeneration method of the modified 5A molecular sieve after the n-hexane is absorbed. The modified 5A molecular sieve and method have the advantages that the modified 5A molecular sieve has larger porosity, the absorption amount of the n-hexane is increased, and more isohexane (containing small amount of n-hexane) can be treated; by means of the vapor replacement method, carbon deposition due to local excessively high temperature when the n-hexane is removed through high temperature and pressure directly is avoided.