煤间接液化精制减三线油制备高端白油反应性能的研究

Study on refining of reduced third-line oil from coal indirect liquefaction to high-end white oil

以煤间接液化精制减三线油为原料,在100 mL固定床反应器中考察了反应温度、氢分压、氢油比和空速等对制备高端白油产品性能的影响。结果表明,温度升高时,催化剂活性升高,白油收率下降,白油产品的倾点和浊点下降;氢分压增大时,催化剂活性稍微降低,选择性增加,产品倾点升高,压力的增大抑制了裂化反应,降低了催化剂的失活速率;随氢油比的增加,转化率稍有下降,异构体选择性稳中有升,从经济上来说,高氢油比造成生产能力降低和氢气回收成本增加;随空速增加,催化剂活性下降,选择性上升,处理能力也增大,但停留时间减小,烷烃分子与催化剂接触时间缩短,反应深度不足,引起产品倾点升高。选择合适的工艺条件,可有效改善高端白油反应性能,提高高端白油产品的质量和加工的经济性。

The effects of reaction temperature,reaction pressure,hydrogen-oil ratio and space velocity on the properties of white oil were investigated in a 100 mL fixed-bed reactor with reduced third-line oil from indirect liquefaction of coal as raw material.The results showed that with the increase of temperature,the activity of catalyst increased,the isomerization yield decreased,and the pour point and turbidity point of base oil products decreased.With increasing pressure,the activity of catalyst decreased slightly,the selectivity and pour point of product increased.With increasing pressure,cracking reaction is inhibited and deactivation rate of catalyst decreases.With the increase of hydrogen/oil ratio,the conversion decreased slightly,while the selectivity of isomers increased.Economically,the high hydrogen/oil ratio leads to the reduction of production capacity and high cost of hydrogen recovery.With the increase of space velocity,the activity of catalyst decreased,the selectivity and processing ability increased.While the contact time between alkane and catalyst was short due to short residence time,the reaction depth was shallow,and the turbidity point of the product increased.Appropriate process conditions can effectively improve the reaction performance and quality of high-end white oil,and improve the economy of product processing.