Abstract: RAX-4000 is a new generation of p-xylene adsorbent developed by SINOPEC Research Institute of Petroleum Processing Co., Ltd. Its adsorption capacity, adsorption selectivity and productivity are significantly improved compared with the previous generation of adsorbent. RAX-4000 was successfully applied in the adsorptive separation unit of aromatics complex in SINOPEC Jinling Company. The results of long-period industrial application showed that the purity of p-xylene was 99.84%, the single-pass yield was 99.0%, the desorbent-to-feed mass ratio was 1.05, and the average chamber pressure drop was 0.21 MPa. RAX-4000 has been running smoothly and its technical index was advanced in the past 3 years.

Key words: RAX-4000 adsorbent, p-xylene, adsorptive separation