Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Patent
1994-07-15
1996-03-05
Langel, Wayne
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
252373, 4236481, 423652, 423653, 423654, C01B 302, C01B 326, C01B 3118
Patent
active
054965314
ABSTRACT:
High surface purity heat transfer solids are formed, suitably by washing and treating particulate refractory inorganic solids, notably alumina, which contains as impurities up to about 0.5 wt. % silicon and/or up to about 500 wppm boron, with an acid, or dilute acid solution sufficient to reduce the concentration of silicon and boron in the outer peripheral surface layer of the particles, e.g., as measured inwardly toward the center of a particle to a depth of about 50 .ANG. using X-ray photoelectron spectroscopy, to no greater than about 5 atom percent silicon and boron, preferably about 2 atom percent silicon and boron, based on the total number of cations within said outer peripheral surface layer, thereby reducing the tendency of said particles to sinter and agglomerate in the conversion of said hydrocarbon to hydrogen and carbon monoxide in a fluidized bed synthesis gas operation vis-a-vis particles otherwise similar except that the particles are not treated with the acid. The tendency of the particles to sinter and agglomerate is further reduced by the additional removal of sodium, iron, calcium, and titanium impurities from the outer peripheral surface layer of the particles. Preferably the latter named impurities, or impurities other than silicon and boron, are reduced to a concentration below about 20 atom %, more preferably to a concentration below about 15 atom %, in the outer surface layer of the particles.
REFERENCES:
patent: 2546606 (1951-03-01), Mayland
patent: 4542113 (1985-09-01), Meyer et al.
patent: 4888131 (1989-12-01), Goetsch et al.
patent: 5143647 (1992-09-01), Say et al.
patent: 5177303 (1993-01-01), Griffiths et al.
Clavenna LeRoy R.
Davis Stephen M.
Fiato Rocco A.
Say Geoffrey R.
Exxon Research and Engineering Company
Langel Wayne
Proctor Llewellyn A.
Simon Jay
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