减压渣油掺炼焦化蜡油的焦化反应研究

摘要

以国内某炼油厂减压渣油为焦化原料,选用该厂焦化蜡油作为供氢剂,并将焦化蜡油切割成小于400℃馏分(A)、400～430℃馏分(B)和430～460℃馏分(C)3个窄馏分,测定了3个窄馏分的结构参数和供氢指数,并在相同的反应条件下,在减压渣油中分别掺炼质量分数10％的3个窄馏分,考察了各焦化产物的收率,并与纯减压渣油焦化反应进行了对比.结果表明:3个窄馏分供氢指数由大到小的顺序为A＞B＞C;掺炼窄馏分A的焦化反应液体收率明显高于纯减压渣油焦化反应;在3个窄馏分中,掺炼A时的液体收率最高,掺炼B时次之,掺炼C时最低,这与3个窄馏分供氢指数的测定结果一致.%A vacuum reside was chosen as a coking feed.Three narrow cuts:＜400 ℃ (A),400-430 ℃ (B),and 430-460 ℃ (C)of the coking gas oil in the same refinery were used as hydrogen donors.The hydrogen-donating indexes and structure parameters of three narrow fractions were measured.Under the same coking conditions,the product yields of the residue blending with 10％ narrow cut respectively were examined and compared with the results of pure residue without narrow cut.The order of hydrogen-donating indexes of three narrow fractions is A＞B＞C.The same order is for liquid yields for residue blending with three cuts.While the yield of liquid product of vacuum residue with cut A is higher than the pure residue.