FCC汽油馏分在改性HZSM-5催化剂上的芳构化

Aromatization for FCC Naphtha Fraction on Modified HZSM-5 Catalysts

采用多种方法对HZSM～5进行改性，以沸程75～120℃的催化裂化汽油馏分为原料，在实验室连续固定床反应装置上考察了采用不同方法改性的HZSM-5催化剂的芳构化反应性能。实验结果表明，催化剂的稳定性顺序为HZSM-5〈Zn／HZSM-5〈Zn／HZSM-5（水热）〈ZnSn／HZSM-5〈ZnP／HZSM-5〈ZnSn／HZSM-5．（水热）〈ZnP／HZSM-5（水热）。经过水热处理的ZnP／HzsM-5催化剂具有较好的芳构化活性及稳定性，在反应温度430℃、压力0．1MPa、液时空速1h。的反应条件下，原料中烯烃转化率达83．55％，液相产品中烯烃质量分数及芳烃质量分数分别为7．28％和81．96％，而且产品中甲苯质量分数最高达29．36％。

HZSM--5 was modified by different method, and the aromatization performances of different modified HZSM--5 catalysts were investigated with a continuous fixed reactor using FCC gasoline（75 - 120 ℃ fraction）. The experimental results show that order in stability of catalysts is HZSM -- 5 〈 Zn/HZSM - 5 〈 Zn/HZSM - 5 （hydrothermal） 〈 ZnSn/HZSM - 5 〈ZnP/HZSM-5〈ZnSn/HZSM-5（hydrothermal）〈ZnP/HZSM 5（hydrothermal）. The hydrothermal treated ZnP/HZSM-5 catalyst has better decreasing olefins and aromatization activity and stability. Under reaction temperature 430℃, pressure 0.1 MPa, liquid hour space velocity 1 h^-1 , the olefins conversion rate in feedstock is 83.55 %, olefins content and aromatics content in the liquid product are 7.28% and 81.96%, respectively. Especially the content of toluene in the liquid product is up to 29. 36%.