Preparation method of magnesium salt precipitation modified Y-type molecular sieve

• Main Authors: SU YI, LIU MINGXIA, WANG CHENCHEN, ZHAI JIANING, SUN YANBO, ZHAO LIANHONG, CAO GENGZHEN, ZHANG ZHONGDONG, LIU ZHAOYONG, SUN XUEQIN, LIU TAO, CAO LANHUA
• Format: Patent
• Language: Chinese; English
• Published: 03.09.2019
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CRACKING HYDROCARBON OILS; FUELS; LUBRICANTS; METALLURGY; MINERAL WAXES; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention relates to a preparation method of a magnesium salt precipitation modified Y-type molecular sieve. NaY zeolite (the silicon-aluminum ratio is more than 4.0 and the crystallinity is morethan 75%) is taken as a raw material, and rare earth exchange, dispersion exchange and first roasting are carried out to obtain a ''once exchange and once roasting'' rare earth- NaY molecular sieve; the ''once exchange and once roasting'' rare earth- NaY molecular sieve is subjected to exchange sodium reduction modification, magnesium salt precipitation modification, and second roasting treatmentto obtain the magnesium salt precipitation modified Y-type molecular sieve, wherein the magnesium salt precipitation modification can be carried out before the second roasting, after the second roasting, or simultaneously before and after the second roasting, and the sequence is not particularly limited. A cracking catalyst prepared by adopting the molecular sieve can control the proportion of different reactions in the cr