喷雾干燥成型法制备催化裂化催化剂的球形度影响因素分析

分析了催化裂化催化剂喷雾干燥过程中的不同形貌微球成型机理，考察了喷雾干燥成型工艺和催化剂浆液特性对催化剂球形度的影响。结果表明，在热空气的进出口温差约为260 ℃、载气量为1 500~2 000 m3/h、雾化机转速为5 000~14 000 r/min的喷雾干燥成型条件下，催化剂球形度相对较高，不小于0.85；通过增加催化剂浆液总固物质量分数、降低浆液黏度、优化使用黏结剂的类型及其用量，有益于提升催化剂球形度；通过综合优化喷雾干燥成型工艺和催化剂制备过程，可制备出具有实心结构、表面圆整的微球催化剂，所制备的原位晶化催化剂和助催化剂的球形度均大于0.90，半合成催化剂的大于0.88。

Analysis of influencing factors on sphericity of FCC catalyst particles prepared by spray drying

The formation mechanism of different morphology of catalytic cracking catalyst particles in spray drying process was analyzed， and the influence of the spray drying process and the characteristics of the catalyst slurry on the sphericity of catalyst particles was studied. The results showed that: Under the conditions of the temperature difference of hot air between the inlet and outlet at about 260 ℃， the air loading at 1 500-2 000 m3/h， the atomizer speed at 5 000 - 14 000 r/min， the sphericity of the prepared catalyst particles was relatively high， not less than 0.85. The ways of increasing the total solid mass fraction of catalyst slurry， reducing the viscosity of the slurry and optimizing the type and dosage of binder were beneficial to improving the sphericity of the catalyst particles. It was possible to prepare the microsphere catalyst with solid structure and round surface by optimizing the spray drying process and catalyst preparation method， moreover， the prepared particles sphericity of the in situ crystallization catalyst and the catalyst promotor both were greater than 0.90， and that of the semi-synthetic catalyst was greater than 0.88.