Preparation and Industrial Application of DOT-200 Reformate-Olefin-Removal Catalyst
1. Zhenhai Refining and Chemical Company, SINOPEC, Ningbo 315200, China;
2. Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
Abstract DOT-200 reformate-olefin-removal catalyst was prepared by modifying the ultra-stable Y type molecular sieve (HUSY-2), and characterized by using X-ray diffraction, NH3-temperature programmed desorption, scanning electron microscope/transmission electron microscope and N2 adsorption methods to solve the solidification pressure of waste clay in the aromatic industry, and further reduce the work load of catalyst regeneration of the current deolefin technology. The performance of DOT-200 catalyst was investigated in laboratory and industrial unit respectively. The results showed that DOT-200 catalyst had less strong acid centers, richer secondary pore structure, and larger specific surface area, pore size and pore volume. Its single lifetime is one and half times of that of DOT-100 catalyst. Both catalysts had the equivalent regeneration effect. It was found that the side reactions leading to the toluene increase or xylene loss were almost not observed using DOT-200 as catalyst at 150 oC. When the average bromine index (BI) of the raw material was 800 mg-Br/100 g and the weight hourly space velocity (WHSV) was 1.7 h-1 to 1.8 h-1, DOT-200 catalyst can continuously run for 9 months on industrial plants with negligible 0.10% to 0.14% toluene increment and no obvious xylene loss. The adsorbent feed bromine index was always below 20mg-Br/100 g. Hence, the comprehensive performance of DOT-200 catalyst was good.
