Industrial Application of a Catalyst for Olefin Removal from DOT-300 Reformate
LONG You1, KUANG Liangbin1, ZHOU Yaxin2, LI Wei2, HOU Min2, ZHENG Junlin2
1. SINOPEC Maoming Company, Maoming Guangdong 525000, China;
2. Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
Abstract：Severe technical challenges, such as short lifetime, frequent discharge of deactivated clay, and quality fluctuation of C8A product, had been encountered when modified clay was originally used to remove the olefin compounds in reformate in SINOPEC Maoming Company. After using DOT-300 catalyst developed based on MWW structure nano-lamellar molecular sieve as the active component, it showed excellent deep olefin removal performance, long-term stability and good tolerance to raw materials with high non-aromatics content, and the quality of xylene products was good. During the operation period of more than 20 months, the bromine index (BI) of raw materials was 700-1 600 mg-Br/100 g, and the maximum content of non-aromatics was 0.96%. Under the conditions of mass space velocity of 4.1 h-1 and temperature of 178-193 ℃, BI of effluent from the DOT-300 catalyst bed was in 30-110 mg-Br/100 g, BI of xylene product was lower than 14 mg-Br/100 g, and the toluene content in C8 aromatic was 0.05%-0.15% in the stable stage. The steam consumption in de-heptane tower was reduced from an average of 16.62 t/h under clay mode to an average of 12.58 t/h after using DOT-300 catalyst. The outstanding performance of DOT-300 de-olefin catalyst can be ascribed to the two-dimensional morphology and abundant active sites in 12MR cups of the MWW type nano-lamellar molecular sieves.
LONG You,KUANG Liangbin,ZHOU Yaxin et al. Industrial Application of a Catalyst for Olefin Removal from DOT-300 Reformate[J]. Chemical Reaction Engineering and Technology, 2022, 38(3): 283-288.
