Mobil Oil Corporation

Emmerson Bowes

David S Shihabi

Clarence D Chang

Malvina Farcasiu

Eric J Scott

Scott S Han

Bruce P Pelrine

Richard F Socha

Tsoung Y Yan

David O Marler

Robert P Absil

Eric G Derouane

Gary J Green

Thomas R Stein

Fritz A Smith

Alan W Peters

Susan D Brandes

Allan W Peters

The catalytic activity of a crystalline aluminosilicate zeolite having a Constraint Index of from about 1 to about 12 for a variety of hydrocarbon conversions including the oligomerization of olefins to provide high viscosity index lubes is significantly enhanced by modifying the catalyst to reduce surface acid sites. This is accomplished by contacting the zeolite with a fluorosilicate salt to extract surface zeolitic aluminum which is replaced by silicon.

Modified crystalline aluminosilicate zeolite catalyst and its use in the

Emission of noxious nitrogen oxides with the flue gas from the regenerator of a fluid catalytic cracking plant are reduced by incorporating into the circulating inventory of cracking catalyst separate additive particles that contain a copper-loaded zeolite material having a characteristic structure with a defined X-ray diffraction pattern. The preferred material of this type is zeolite MCM-22. The copper may be exchanged onto the zeolite or impregnated into the catalyst. In addition, the catalyst may include titanium or zirconium to provide stability and further improvements in stability may be obtained with the addition of rareearth metal cations, especially cerium or yttrium. NOX and CO emissions from the regenerator are reduced, and the gasoline produced in the unit may have an improved octane number.

Catalytic cracking of hydrocarbons

The catalytic activity of a crystalline aluminosilicate zeolite having a Constraint Index of from about 1 to about 12 for a variety of hydrocarbon conversions including the oligomerization of olefins to provide high viscosity index lubes is significantly enhanced by modifying the catalyst to reduce surface acid sites. This is accomplished by contacting the zeolite with a fluorosilicate salt to extract surface zeolite aluminum which is replaced by silicon.

The present invention provides a process for modifying a crystalline aluminosilicate zeolite having a Constraint Index of from about to about 12 which comprises:

A lubricant dewaxing process which is useful with difficult feeds, especially highly waxy feeds having paraffin contents in excess of 25 weight percent or feeds with high nitrogen levels, employs two-step dewaxing in which the first stage is carried out under relatively mild conditions using a binder-free zeolite dewaxing catalyst to obtain extended catalyst cycle life between successive reactivations with a constant temperature for the duration of each dewaxing cycle. The second stage dewaxing is also carried out with a binder-free catalyst under conditions which maintain the target pour point for the product with a progressively increasing temperature during each dewaxing cycle. More than one preliminary dewaxing stage may be provided in order to reduce severity in each stage with mild conditions and constant temperature being maintained in the preliminary steps. Using this process, extended catalyst cycle lives may be obtained with difficult feeds.

Catalytic dewaxing process using binder-free zeolite

A catalytic dewaxing process in which a waxy hydrocarbon feed is dewaxed over binder-free zeolite dewaxing catalyst. The absence of binder reduces catalyst aging especially when operating at controlled space velocities in the range of 0.25 to 1.5 LHSV. The process is especially useful with lube oil stocks where aging problems are particularly severe, typically highly waxy stocks or stocks containing high levels of nitrogen. Preferred catalysts are the intermediate pore size zeolites such as ZSM-5, ZSM-11 and ZSM-23.

Catalytic dewaxing process using binder-free catalyst

The present invention relates to an improved process for synthesizing pyridine or alkylpyridines comprising reacting ammonia with a carbonyl reactant in the presence of a catalyst composition which comprises a crystalline silicate having a silica/alumina mole ratio of at least 12 and a Constraint Index within the range of 1 to 12, the improvement comprising reacting said ammonia with said carbonyl compound in the presence of a catalyst composition which comprises (i) a crystalline silicate having a silica/alumina mole ratio of at least about 12, a Constraint Index of from about 1 to about 12, and an Alpha Value of less than about 50, and (ii) a binder of amorphous silica.

Pyridine and alkylpyridine synthesis using a crystalline silicate

There is provided a method for activating preformed, crystalline aluminum phosphates by combining these aluminum phosphates with an activating metal oxide, such as silica, and water under conditions, such as mulling, sufficient to increase the acid catalytic activity of the material.

Activation of metallophophates

Residual oils containing metals and sulfur are demetallized and desulfurized by adding to the oil an aromatic solvent and contacting the mixtures in the presence of hydrogen with an alumina having an average pore size greater than about 220 Angstroms.

Hydrotreating petroleum heavy ends in aromatic solvents with large pore

The present invention is directed to a method for extruding silica-rich solids. The method comprises mixing silica-rich solids with water in an alkali metal base or basic salt followed by mulling and extruding and subsequently drying the extrudate whereby the dried extrudate has a crush strength superior to that of the prior art. The silica-rich solids can be silica alone, zeolite alone or a mixture thereof. The alkali metal can be sodium hydroxide. The invention is also directed to a product which has a special attribute in that they have sufficient integrity to withstand treatments with acids so that it is now possible to steam, acid extract, or calcine such extrudates. The catalyst can be used in hydrocarbon conversions such as hydrocracking, isomerization, hydrogenation, dehydrogenation, polymerization, reforming, catalytic cracking, or catalytic hydrocracking. The invention also relates to a method for extruding silica-rich solids which comprises substituting an alkali metal for hydrogen in silanol groups on outside surfaces of the silica-rich solids, mulling and extruding the substituted silica-rich solids and drying the extrudate whereby the dried extrudate has a crush strength superior to that of the prior art. The invention is also directed to a method for increasing the silica to metal ratio of a zeolite. The method comprises mixing silica-rich solids with water and an alkali metal base or basic salt, mulling and extruding the silica-rich mixture, drying the extrudate, ion exchanging the extrudate and recovering the catalyst which can be substantially metal free.

Extrusion of silica-rich solids

An improved catalyst for methanol conversion having enhanced stability is obtained by extruding a zeolite having a silica-to-alumina ratio of at least 12 and a Constraint Index within the approximate range of 1 to 12 with a silica matrix and thereafter subjecting the extrudate to both steaming and acid-extraction in order to enhance the stability thereof.

Catalyst for methanol conversion by a combination of steaming and

Residual oils containing metals and sulfur are demetalized and desulfurized by adding to the oil an aromatic solvent and contacting the mixture in the presence of hydrogen with an alumina having dual pore size distribution in ranges of 90-200 Angstrom units and 1000-5000 Angstrom units.

Hydrotreating petroleum heavy ends in aromatic solvents with dual pore

Disclosed is a method for preparing an alumina composition having two concentrations pore sizes, one in the 90-200 Angstrom range and the other in the 1000 to 5000 Angstrom range. Method is based on heating one type of alumina to 1400.degree. F., mixing it with unheated alumina and reheating to the 1400.degree. F. temperature.

Demetalation catalyst and a method for its preparation

A process for the demetalation of heavy petroleum residua is provided wherein said residua dispersed in a suitable solvent is contacted with a large pore solid sorbent whereby organomettalic compounds or complexes contained in said residua are selectively adsorbed by the large pore solid sorbent.

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Hopewell, NJ, United States of America

Emmerson Bowes