反应条件对萘饱和加氢的影响

在固定床反应器中,采用Ni/γ-Al2O3加氢催化剂,考察了反应温度、压力和空速对萘转化率、四氢萘和十氢萘选择性、十氢萘反顺质量比的影响规律,并进一步考察了两种不同构型(反式和顺式)十氢萘产物的选择性生成。结果表明,反式和顺式十氢萘的总选择性可达95%以上,萘的转化率可达100%;较佳工艺条件为:空速0.6～6.0 h-1,反应温度210～250℃,压力不低于5.4 MPa。根据反顺质量比随空速、温度和压力的变化趋势,做了进一步的考察,结果显示,在保持十氢萘总选择性高于97%的前提下,可实现反式与顺式十氢萘各自的高选择性生成,反顺质量比可取得高值8.70和低值0.86。

Effects of Reaction Conditions on Saturated Hydrogenation of Naphthalene

The effect of hydrogenation reaction temperature,pressure and space velocity on the conversion of naphthalene,the selectivity of tetralin and decalin as well as the mass ratio of trans-/cis-decalin was investigated over nickel-alumina catalysts in a fixed bed reactor.Furthermore,the selective formation of the two isomers of decalin(trans-and cis-decalin) was also studied.The results showed that the conversion of naphthalene could achieve 100% and the selectivity of decalin was higher than 95% at 0.6～6.0 h-1of the space velocity,210～250 ℃ of reaction temperature and higher than 5.7 MPa of hydrogen pressure.Further investigation of the selective formation of trans-decalin and cis-decalin was carried out based on the tendency of trans-decalin/cis-decalin mass ratio varying with the different reaction temperature,pressure and space velocity.The results revealed that the highly selective formation of the trans-decalin as well as cis-decalin could be achieved and the trans-decalin/cis-decalin mass ratio could attain a higher value of 8.70 and a lower value of 0.86.