提升管反应器中催化裂化与热裂化反应的模拟

利用小型提升管催化裂化实验装置对工业提升管中的催化裂化和热裂化反应进行了实验模拟研究，考察了反应停留时间、反应温度和剂油比对催化裂化和热裂化反应的影响，在此基础上对催化裂化反应工艺条件进行了分析。结果表明，缩短反应停留时间和提高剂油比可有效抑制提升管反应器中热裂化反应的发生，提高轻质油收率；提高反应温度虽然可在一定程度上提高轻质油收率，但反应温度过高会使热裂化反应加剧，从而使产物分布变差；当采用高温、大剂油比操作时，缩短反应时间，尽量消除提升管反应后期的热裂化反应，是改善催化裂化产物分布的关键。

Simulating experiments on catalytic cracking and thermal cracking reactions in riser reactor

Thermal cracking and catalytic cracking reactions which occurred in riser reactors were studied using a pilot riser-type fluid catalytic cracking unit.The effects of residence time,reaction temperature and catalyst/oil ratio on thermal cracking and catalytic cracking reactions were also investigated in detail.Optimization on the operation conditions of residuum fluid catalytic cracking(RFCC) process with high-temperature,high catalyst/oil ratio and short residence time was carried out.The experimental results show that shortening residence time and increasing catalyst/oil ratio can decrease thermal cracking reactions in riser reactor and increase light oil yield.Properly high temperature in riser reactor can increase ligh oil yield,but too high temperature will lead to worse product distribution.Under the operatin conditions of higher temperature and catalyst/oil ratio,shortening residence time to suppress undesirable thermal cracking is the key to obtain better product distribution in RFCC process.