加氢饱和C_(10)~+重芳烃的轻质化反应工艺考察

随着C_(10)~+重芳烃的产量大幅上升,对C_(10)~+重芳烃的有效转化利用技术需求日益迫切,开发了一种将加氢饱和C_(10)~+重芳烃转化为轻质芳烃的高效轻质化催化剂及工艺。采用气相色谱和全二维色谱对加氢饱和C_(10)~+重芳烃进行了组分分析,研究了反应温度、氢气压力、质量空速、氢油比等工艺条件对轻质化的转化率和选择性等结果的影响,以及催化剂的长周期稳定性和再生性能。在考评温度380℃,氢气压力5.0MPa,液体质量空速1.5 h~(-1),氢油体积比1 000的条件下,C_(10)~+的转化率达到75%以上,轻质芳烃,包括苯、甲苯、二甲苯、C_9和C_(10)的选择性65%左右,得到的轻质化产品中,苯、甲苯和二甲苯(BTX)的占比达到75%以上,苯产品纯度大于98%,二甲苯纯度大于99.2%。研究表明,所用的轻质化催化剂具有良好的长周期稳定性,在300 h的连续反应中,C_(10)~+的转化率和轻质芳烃,包括BTX,C_9和C_(10)的选择性保持稳定。长周期运行后失活的催化剂经过简单的焙烧可以再生,再生催化剂的活性与新鲜催化剂的活性相当。将加氢饱和和轻质化技术进行耦合,从C_(10)~+重芳烃生产轻质芳烃,能够极大地提高C_(10)~+重芳烃的利用价值,具有很好的技术可行性和工业应用前景。

Investigation on Process of Conversion of Hydrogenation Saturated C10+ Heavy Aromatics to Light Aromatics

With the rapid increase of the production of C10+ heavy aromatic,the technical requirements for the efficient conversion and utilization of C10+ heavy aromatics have become increasingly urgent.A kind of high efficiency light catalyst and its technology for converting saturated C10+ heavy aromatics into light aromatics were developed,the saturated C10+ aromatics were analyzed by GC and comprehensive two-dimensional GC,the effects of reaction temperature,hydrogen pressure,weight hourly space velocity and the ratio of hydrogen to oil on the conversion and selectivity were studied,besides,the long period stability and regeneration performance of the catalyst were also investigated.Under the reaction condition of 380 ℃,5.0 MPa H2 pressure,weight hourly space velocity (WHSV) 1.5 h-1,ratio of H2 to oil 1 000,the conversion of C10+ heavy aromatics is as high as 75％,and the selectivity of light aromatics (including BTX,C9 and C10) is about 65％.In the light products,the percentage of BTX is more than 75％,the purity of benzene product is higher than 98％,and xylene purity is higher than 99.2％.The results show that the catalyst has a good long period stability,and can be used in the continuous reaction of 300 h,while the conversion of C10+ heavy aromatics and the selectivity of light aromatics remain stable.The deactivated catalyst caused by long period of operation can be recovered by simple calcination and the activity of the regenerated catalyst is comparable to that of the fresh catalyst.The coupling of the hydrogenation saturation of C10+ heavy aromatics and the conversion of hydrogenation saturated C10+ heavy aromatics to light aromatics,obtaining light aromatics from C10+ heavy aromatics,can greatly improve the utilization value of C10+ heavy aromatics,and has a good technical feasibility and industrial application prospects.