Catalytic cracking with injection of gasoline into catalyst zone - using catalyst contg. matrix, zeolite and mordenite with high ratio of silicon to aluminium and low sodium content

摘要

In catalytic cracking of a hydrocarbon feed in a fluid bed or in a bed fed into an elongated vertical tubular zone, where the catalytic particles are fed into one end of the elongated zone, the feed is fed into the elongated zone through at least one pipe at a level (B) downstream from the level of catalyst feed, the catalyst particles are sepd. from the reaction effluent, which is sepd. into different fractions, esp. LPG, a gasoline, a light oil (LCO) and a heavy oil (HCO), and a gasoline is fed into the elongated zone at a level (C) between the level of catalyst feed and level (B); the gasoline forms 5-50 vol.% of the feed. The catalyst contains (a) 20-95 wt.% of a matrix, (b) 1-60% of a zeolite with open structure, (c) 0.01-30% of a mordentie with atomic ratio of Si:Al at least 4.5, less than 0.2 wt.% Na, vol. (V) of the elementary mesh below 2-8 cubic nm, and adsorption capacity for N2 at 77 deg.K and relative pressure P/Ps of 0.19 above 0.09 cc (liq.)/g. ADVANTAGE - The process offers flexibility w.r.t. structure and yield of prods. and quality of the gasoline cut (i.e. octane index). Max. yields of liquified petroleum gas (LPG) and of gasoline with high octane number, and often of LCO are obtd..