高温下工业NiW/Al_2O_3催化剂上萘的加氢饱和反应

在中压固定床中,高温条件下研究了工业NiW/Al2O3催化剂上硫化氢气氛中反应温度、反应压力和空速对萘加氢饱和反应过程的影响。实验结果表明,在液时空速为10—30 h-1,氢油体积比为800,高反应温度区320—380℃的实验条件下,萘加氢主要生成四氢萘和十氢萘,而进一步加氢裂化产物较少;提高反应温度,萘转化率和四氢萘的收率下降,加氢裂化产物略有升高,表明高温不利于芳环的加氢饱和;提高加氢反应压力,萘的转化率和四氢萘的芳环加氢程度提高;综合反应结果,提出了高温条件下萘加氢的简化可逆连串反应途径。

Reactivity of saturated hydrogenation of naphthalene over the commercial NiW/Al2O3 catalyst at high reaction temperature

Taking naphthalene as the model compound for aromatics,the kinetics effect of the saturated hydrogenation of naphthalene was studied over the commercial NiW/Al2O3 catalyst RN-10 in presence of H2S.The effect of reaction conditions on the naphthalene conversion,variation of tetralin and decalin was studied at 320-380 ℃ of reaction temperature,4.0-5.8 MPa of hydrogen pressure,and 10-30 h-1 of space velocity at 800 of volume ratio of hydrogen/oil.The result shows that tetralin and decalin are primary products for hydrogenation of naphthalene with a little product for further hydrocracking.High reaction temperature is unfavorable for hydrogenation of aromatic ring,as the conversion of naphthalene and tetralin yield decrease with temperature increasing/ The products of hydrocracking slightly rise with temperature increasing.Hydrogenation of naphthalene and tetralin can be improved by the high pressure employed.According to the effect of space time and other result,saturated hydrogenation of naphthalene can be described by a proposed sequential-reversible reaction network.