Abstract:

A new denitrogenation agent and a relative process were developed to deeply remove basic nitrogen impurities from the light naphtha (topped oil) of distillation column of reforming feed prehydrogenation unit. Through the lab test in a fixed-bed down-flow reactor, the optimal conditions of denitrogenation process were determined as follows: 40 ℃of adsorption temperature, 0.5-1.0 MPa, space velocity=5.0-10.0 h-1. The technology has been successfully applied in an isomerization unit with 0.3 Mt/a of Sinopec Tahe Petrochemical Co. The results show that the nitrogen content of the light naphtha is lower than 0.1 μg/g, meeting the requirement of the subsequent low temperature isomerization process. The octane number of the isomerization product is 20 percentage points higher than that of feed.

Key words: topped oil, C5/C6 isomerization, deep denitrogenation, molecular sieve