Abstract

In this study, the whole fraction low temperature coal tar (LTCT) was used as raw material, a series of hydrodeasphaltenization (HDAs) experiments were conducted in an isothermal trickle bed reactor, then the kinetic equation of the reaction was established in gPROMS software and the parameters were estimated. The trickle bed reactor model was established and the effects of operating conditions on HDAs reaction and catalyst effective factors were analyzed. The reactor temperature was varied from 623 to 683 K, the hydrogen pressure from 6 to 12 MPa, keeping constant hydrogen-to-oil volume ratio at 1000:1, liquid hourly space velocity at 0.5 h⁻¹. The results showed that the relative error between the experimental and the simulated results were less than ± 5%, which proved that the model had good applicability; the activation energy was 149.8 kJ mol⁻¹, the pre-exponential factor was 633,832, the reaction order was 1.347, and the order of hydrogen was 2.33. The higher activation energy indicated that the HDAs was difficult to occur compared with the reaction in crude oil. And the high hydrogen order indicated that the pressure had a significant influence on the reaction rate. However, the high temperature and low pressure would reduce the effective factor of the catalyst. The reason may be that the large diffusion limitation and reaction heat of asphaltenes lead to a large difference in reaction rates between the catalyst surface and the tunnel of pores under high temperature. This study could contribute to a more in-depth understanding of the features and rules of LTCT HDAs, and also provide a useful model for reactor design, operation and control.

中文翻译：

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Ni-Mo /γ-Al2 O 3加氢脱沥青全程低温煤焦油的动力学参数估计和反应器模拟

摘要

本研究以全馏分低温煤焦油（LTCT）为原料，在等温滴流床反应器中进行了一系列加氢脱沥青（HDAs）实验，然后在gPROMS软件中建立了反应动力学方程，估计参数。建立了滴流床反应器模型，分析了操作条件对HDAs反应和催化剂有效因素的影响。反应器温度在623至683 K之间变化，氢气压力在6至12 MPa之间，保持恒定的氢与油体积比为1000：1，液时空速为0.5 h ^-1。结果表明，实验结果与模拟结果的相对误差小于±5％，说明该模型具有良好的适用性。活化能为149.8 kJ mol ^-1，前指数因子为633,832，反应顺序为1.347，氢的顺序为2.33。较高的活化能表明，与原油中的反应相比，HDA难以发生。高氢序数表明压力对反应速率有重要影响。然而，高温和低压会降低催化剂的有效因子。原因可能是沥青质的扩散限制和反应热大导致在高温下催化剂表面与孔道之间的反应速率差异大。这项研究可能有助于更深入地了解LTCT HDA的特性和规则，并为反应堆的设计，运行和控制提供有用的模型。