摘要
硅酸锌(Zn2SiO4)的生成是导致S Zorb吸附剂活性下降和碎化的重要原因之一。在530℃干燥焙烧和水热条件下,采用原位XRD技术考察了不同运行阶段吸附剂生成硅酸锌的情况;根据装置运行过程中吸附剂的再生工况,采用常压和加压的高通量水热焙烧炉对S Zorb吸附剂进行长时间的水热焙烧,考察硅酸锌的生成状况。结果表明,在干燥焙烧条件下,新鲜S Zorb吸附剂不容易生成硅酸锌,而再生剂则会生成硅酸锌,且少量硅酸锌的存在会加快其中硅酸锌的生成速率;在水热条件下,新鲜吸附剂焙烧约40h后开始产生硅酸锌,但生成速率明显小于再生剂的;水热条件下再生剂中硅酸锌的生成速率明显高于干燥焙烧条件;水热加压条件将促进水蒸气在吸附剂中的扩散,并提高硅酸锌的生成速率。
Willemite formed in S Zorb sorbents is one of the reasons causing activity decreasing and sorbent broken. In-situ dry and hydrothermal XRD were used to study the formation of willemite in S Zorb sorbents of different stages during the unit operation. Based on the real operation parameters, the sorbents were calcinated for a long time under atmosphere and pressurization in high flux hydrothermal furnace to study the willemite formation. The results showed that there was no willemite formed in fresh sorbent, and the willemite was formed in regenerated sorbent, furthermore, a small amount of willemite in regenerated sorbent could accelerate the formation rate of willemite under dry calcination condition. The willemite was formed in fresh sorbent after calcinated for 40 h, but the formation rate of willemite in fresh sorbent was much lower than that in regenerated sorbent under the hydrothermal condition, which was much higher than that under dry condition. Pressurization and hydrothermal condition both increased the diffusion velocity of steam in S Zorb sorbent, and then accelerated the formation rate of willemite.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2013年第4期619-625,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
中国石油化工股份有限公司项目(110099)资助
