催化剂和供氢剂及其前身物对二苯甲烷裂化反应的影响

Effects of dispersed catalysts, hydrogen donors and precursors of hydrogen donors on thermal diphenylmathane cracking reaction

在无搅拌的高压静态反应器及 4 4 0℃条件下对二苯甲烷作为渣油的模型化合物分别进行二苯甲烷的临氮、临氢反应和临氢催化反应 ,考察了在供氢剂及其供氢剂前身物或溶剂 3类添加物存在下二苯甲烷的临氮、临氢和临氢催化反应。分析了临氮热反应、临氢热反应和临氢催化反应中催化剂和供氢剂及其前身物对二苯甲烷裂化反应的影响程度。结果表明 ,气相氢能加速二苯甲烷的裂化反应 ,而供氢剂抑制其裂化。不同的供氢剂对二苯甲烷裂化有不同程度的抑制能力 ,供氢剂的供氢性能越强 ,抑制效应越强。在催化加氢体系中加入油溶性催化剂二烷基二硫代氨基甲酸钼和环烷酸铁 ,对促进二苯甲烷裂化非常有效 ,且前者的裂化活性远高于后者。供氢剂前身物在催化加氢体系中可以转化为供氢剂 。

Diphenylmathane taken as a model compound for residue was put into a non-stirred high-pressure autoclave to investigate the effects of hydrogen atmosphere, dispersed catalysts, hydrogen donors and precursors of hydrogen donors in the systems of thermal-cracking, hydrocracking and catalytic hydro-cracking of diphenylmathane at 440 ℃. The cracking reaction of diphenylmathane and chemical changes of hydrogen donors and precursors of hydrogen donors at different reaction systems were analyzed. There was difference between the effect of hydrogen donor and that of hydrogen atmosphere. The former inhibited the cracking reaction of diphenylmathane in the three systems, and the latter enhanced the cracking of the model compound. In the system of catalytic hydrocracking reaction of diphenylmathane, the effect of two kinds of dispersed catalysts was substantial enhancement for the cracking reaction of diphenylmathane. The cracking activity of molybdenum dialkyl dithiocarbamate was stronger than that of iron naphthenate because of the different properties between the two dispersed catalysts. The precursors of hydrogen donors in the catalytic hydrocracking reaction of diphenylmathane could be transferred into secondary hydrogen donor by dispersed catalysts to inhibit the cracking reaction of diphenylmathane.