中低温煤焦油加氢脱氧工艺条件的优化

Optimization of Hydrodeoxygenation Process for Low-Temperature Coal Tar

在小型固定床加氢装置上,研究了中低温煤焦油加氢脱氧(HDO)工艺过程各参数(反应温度、反应压力、液态空速和氢油体积比)对HDO效果的影响。在单因素实验的基础上,采用响应面分析法对HDO工艺条件进行了优化。实验结果表明,在低于380℃下,中低温煤焦油中酚类化合物的HDO反应主要受动力学规律影响,为了达到较好的HDO效果,HDO反应应在高温、高压和低空速下进行。各因素对加氢脱氧率影响大小的顺序为:液态空速>反应温度>反应压力。优化得到的中低温煤焦油HDO工艺条件为:反应温度385.17℃,反应压力13.51 MP a,液态空速0.30 h-1,氢油体积比1 100∶1。在此工艺条件下,加氢脱氧率可达99.6%±0.03%。

The hydrodeoxygenation（HDO） of low-temperature coal tar was conducted in a fixedbed reactor and the effects of reaction temperature,reaction pressure,LHSV and volume ratio of hydrogen to oil on the HDO process were investigated by means of the response surface methodology based on single-factor tests. The results showed that the HDO process of phenols in low-temperature coal tar at lower than 380 ℃ was mainly influenced by the kinetic rule. High temperature,high pressure and low LHSV were beneficial to the hydrodeoxygenation. The order of the effe cts of the factors on HDO was LHSVtemperaturepressure. Under the optimized conditions of reaction temperature of 385.17 ℃, reaction pressure of 13.51 MPa,LHSV of 0.30 h-1 and volume ratio of hydrogen to oil of 1 100∶1,the hydrodeoxygenation rate could reach 99.6%±0.03%.