FCC汽油低温改质过程的烯烃转化及催化剂积炭

利用微反-色谱联合实验装置和连续式小型提升管催化裂化实验装置研究了催化裂化汽油低温改质过程中烯烃转化和催化剂积炭的过程和规律。通过对模型化合物和催化裂化汽油改质过程中催化剂活性、催化裂化汽油窄馏分、反应温度、剂油比和反应时间对烯烃转化和催化剂积炭的研究表明，大部分烯烃转化和催化剂积炭的反应发生在油剂接触极短的反应时间内，并随着催化剂活性、反应物活性、剂油比和反应温度的提高而增加。在油剂接触后很长的反应时间内，生焦量、积炭速率和烯烃的转化程度都很小，烯烃转化损失率降低，因此，催化裂化汽油在低温改质的条件下可以通过延长反应时间来提高烯烃的转化率。因此，催化裂化汽油改质的最佳工艺条件为，390℃～440℃，剂油比6，催化剂活性61～65，长反应时间，轻馏分进料。

Coke formation and olefins conversion in FCC naphtha olefin reformulation at low reaction temperature

Effects of catalyst microactivity, different distillates, catalyst to oil weight ratio, reaction temperature, and reaction time on coke formation and olefins conversion were studied in FCC naphtha olefin reformulation using a microreactor-GC on-stream analysis system and a continuous pilot riser-type FCC unit. The results showed that the formation of coke deposition and the olefins conversion took place in the transient time of the oil and the catalyst mixing and increased with the catalyst microactivity, reactants activity catalyst to oil weight ratio and reaction temperature. In the long reaction time after the oil and the catalyst mixing, the formation of coke deposition and the olefins conversion were very slow and small, and the ratio of the loss to the olefin conversion decreased, so it was favorable to increase the olefins conversion through the longer reaction time. The optimal condition for FCC naphtha olefin reformulation is reaction temperature at 390℃～440℃, catalyst to oil weight ratio 6, catalyst microactivity from 61 to 65, long reaction time, and light distillates feedstock.