초록 ▼

A hydrotreating process comprises contacting a substantially liquid hydrocarbon-containing feed stream, which contains compounds of sulfur and metals (preferably Ni and/or V), in the presence of a fixed catalyst bed comprising (a) at least one layer of impregnated, substantially spherical alumina-co

A hydrotreating process comprises contacting a substantially liquid hydrocarbon-containing feed stream, which contains compounds of sulfur and metals (preferably Ni and/or V), in the presence of a fixed catalyst bed comprising (a) at least one layer of impregnated, substantially spherical alumina-containing particles which have been prepared by a process comprising the steps of impregnating specific starting material with at least one dissolved magnesium compound and then heating the thus impregnated material at about 500°-900°C. for improved crush strength retention. In a preferred embodiment, the fixed catalyst bed further comprises at least one layer (b) of catalyst particles comprising a refractory inorganic carrier and at least one hydrogenation promoter. A composition of matter comprising the impregnated, spherical alumina-containing particles described above, and a process for preparing them are also provided.

대표청구항 ▼

A multilayer, fixed catalyst bed comprising (a) at least one catalytic layer of impregnated, substantially spherical alumina-containing particles and (b) at least one layer of hydrotreating catalyst particles comprising a refractory inorganic carrier material and at least one hydrogenation promoter

A multilayer, fixed catalyst bed comprising (a) at least one catalytic layer of impregnated, substantially spherical alumina-containing particles and (b) at least one layer of hydrotreating catalyst particles comprising a refractory inorganic carrier material and at least one hydrogenation promoter selected from the group consisting of transition metals belonging to Groups IIIB, IVB, VB, VIB, VIIB, VII9, IB and IIB of the Periodic Table and compounds of said transition metals; wherein said impregnated, substantially spherical alumina-containing particles in catalyst layer (a) have been prepared by a process comprising the steps of (A) impregnating (i) a starting material of substantially spherical alumina-containing particles, which have an initial average particle size of at least about 0.05 inch, an initial surface area, determined in accordance with ASTM method D3037, of at least about 20 cm2/g, an initial pore volume, determined by mercury intrusion porosimetry, of at least about 0.1 cc/g, and an initial content of Al2O3 of at least about 80 weight-%, with (ii) a solution comprising at least one dissolved magnesium compound; and (B) heating the material obtained in step (A) at a temperature in the range of from about 500°to about 900°C. for a period of time of at least 10 minutes, under such heating conditions as to convert at least a portion of said at least one magnesium compound absorbed in step (A) to magnesium oxide and to obtain a material having a higher retention of crush strength, measured after exposure for about 100 hours to a liquid hydrocarbon-containing stream which contains at least about 0.5 weight-% sulfur, under hydrotreating conditions at about 2250 psig total pressure, about 350 psig partial pressure of steam and about 700°F., than said starting material; wherein a layer (a) of said impregnated, substantially spherical alumina-containing particles is placed as support layer below at least one layer (b) of said hydrotreating catalyst particles; and wherein said hydrotreating catalyst particles in layer (b) contain said at least one hydrogenation promoter at a level which is effective for lowering the concentration of sulfur impurities contained in a substantially liquid hydrocarbon-containing feed, when said feed is hydrotreated at a temperature of about 250°-550°C., a pressure of about 0-5,000 psig, a hydrogen feed rate of about 100-10,000 cc H2 per barrel of feed, and a time of about 0.05-10 hours.