Abstract: During the first application of molecular sieve type liquid phase dechlorination agent in a 2.2 Mt/a continuous reforming unit of a refinery, it was found that the pressure drop of dechlorination agent bed was increasing, which made the operation of downstream depentanizer difficult. The analysis of the waste dechlorination agent indicated that the large molecular aromatics in reformate blocked the micropores of the molecular sieve, leading the pressure drop rising. A small amount of molecular sieve with large diameter and large pores dechlorination agent loaded on the top of the dechlorination bed can effectively solve the problem. At the same time, it is proposed that attention should be paid to the control of the final boiling point and nitrogen content of the reformer feed.

Key words: continuous catalytic reforming, molecular sieve, liquid phase dechlorination agent, bed pressure drop