Continuous catalytic pyrolysis of oily sludge was carried out in a special U-shape reactor for producing saturates-enriched light oil. The sludge underwent thermal pyrolysis first and then catalytic pyrolysis. During the thermal pyrolysis, chain hydrocarbons were first cracked and further polymerized into aromatics. The effect of temperatures (400–800 °C) on the products was investigated and the maximum liquid yield (67.7%) was obtained at 500 °C. High temperature promoted polymerization, thus the distribution of aromatics in the liquid product was increased and was more concentrated in polyaromatics at 800 °C. In the catalytic upgrading stage, dolomite was used as catalyst and aromatics were adsorbed on it, either aggregated or decomposed. As a result, a light oil product with 57.0% saturates was obtained at the residence time of 8.9 s due to the conversion of aromatics and heavy hydrocarbons into light aliphatic hydrocarbons such as straight chain hydrocarbons. Compared with the oil phase in the raw sludge sample, the content of saturates was increased by 45.0% and that of the asphaltenes was reduced by 88.5%. Meanwhile, the inherent moisture in the oily sludge could participate in the steam reforming reaction, promoting the decomposition of aromatics and leading to an increase in the H₂ generation. Moreover, the release of H₂S was reduced from 0.132 to 0.005 mol per kg sludge and the sulfur content of the oil product was also decreased in the presence of dolomite. The deactivation of dolomite can be attributed to the carbonization of CaO and deposition of polyaromatic coke on the catalyst surface.

在一种特殊的U型反应器中，对油性污泥进行了连续的催化热解，以生产富含饱和物的轻质油。污泥先进行热裂解，然后再进行催化裂解。在热解过程中，首先将链状烃裂解并进一步聚合成芳烃。研究了温度（400–800°C）对产品的影响，并在500°C下获得了最高液体产率（67.7％）。高温促进了聚合反应，因此液体产物中芳香族化合物的分布增加，并且在800°C下更集中于聚芳族化合物中。在催化提纯阶段，使用白云石作为催化剂，并在其上吸附聚集或分解的芳烃。结果，在停留时间为8时获得了具有57.0％饱和物的轻油产物。9 s是由于芳烃和重烃转化为轻脂族烃（例如直链烃）而产生的。与原污泥样品中的油相相比，饱和物的含量增加了45.0％，沥青质的含量减少了88.5％。同时，油性污泥中的固有水分可能参与蒸汽重整反应，从而促进芳烃的分解并导致H的增加。₂代。此外，在白云石的存在下，H ₂ S的释放量从每公斤污泥中的0.132 mol降低至0.005 mol，并且油品中的硫含量也降低。白云石的失活可以归因于CaO的碳化和多芳烃焦炭在催化剂表面的沉积。