Abstract
The effect of process variables on hydrocracking of an Assam crude residue for middle distillates (140/sup 0/-340/sup 0/) over LaX and NiX catalysts was determined in a rocking-type batch reactor at 330/sup 0/-470/sup 0/C, 400-1300 psi hydrogen charging pressure; pellets of 80 3< exchanged nickel X (NiX) zeolites were used as catalysts. Conversion increased linearly with temperature. Middle distillates and gas-oil yields and the degree of saturation of kerosine decreased whereas naphtha yield increased with increase in temperature. Hydrogen charging pressure (HCP) was not a very significant parameter. The conversion of the residuum to liquid products first decreased slightly and then picked up as hydrogen pressure was raised. The yields of naphtha, kerosine, and diesel first increased and then decreased with an increase in HCP, whereas the yield of gas oil followed a reverse trend. Conversion increased to a maximum, and then decreased with increasing reaction time. The yields of naphtha, kerosine, and middle distillates increased with time, whereas that of gas oil decreased. The results are compared with those obtained earlier over LaX; under all conditions, conversion over LaX was higher than that over NiX.
Published Version
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