摘要:
A process and catalyst for catalytic cracking comprising a non-layered, ultra-large pore crystalline material. The crystalline material preferably has a benzene adsorption capacity greater than about 15 grams benzene/100 grams at 50 torr and 25.degree. C. Preferred materials have a hexagonal electron diffraction pattern that can be indexed with a d.sub.100 value greater than about 18 Angstrom Units and a hexagonal arrangement of uniformly sized pores with a maximum perpendicular cross section of at least about 13 Angstrom units. Preferred cracking catalysts comprise ultra-large pore materials having pore openings formed by at least 20 tetrahedrally coordinated members, most preferably with 36 or 42 tetahedrally coordinated members.
摘要:
Methods for separation of substances are provided. The methods include contacting a mixture of at least two components in flowable conditions with mesoporous, crystalline materials termed M41S which also include MCM-41 materials. The mesoporous crystalline materials may be used in separations as is or functionalized.
摘要:
There is provided an aluminum-containing aluminosilicate zeolite corresponding to the substantially aluminum free silicate zeolite described in the Hinnenkamp et al U.S. Pat. No. 4,376,757. Also provided are methods for making this aluminosilicate zeolite and methods for the catalytic conversion of organic charges to desired products with this aluminosilicate zeolite.
摘要:
A catalytic cracking process is described featuring multiple risers in which a variety of hydrocarbon conversion reactions take place, a stripping unit in which entrained hydrocarbon material is removed from catalyst and a regeneration zone in which spent cracking catalyst is regenerated, which comprises:(a) catalytically cracking a relatively high boiling hydrocarbon charge material in a first riser in the presence of both a first catalyst component which is an amorphous cracking catalyst and/or a large pore crystalline cracking catalyst and a second catalyst component which is selected from zeolite Beta and/or medium pore crystalline silicate zeolite catalyst to provide a variety of products including naphtha and C.sub.3 and/or C.sub.4 olefin;(b) thermally cracking a C.sub.3-6 paraffin-rich charge material introduced to a second riser in a lower region thereof to provide light olefins; and,(c) catalytically converting at least a portion of the light olefins resulting from step (b) within the second riser in a higher region thereof in the presence mainly of a second catalyst component which is at least one member of the group consisting of zeolite Beta and a shape-selective medium pore crystalline silicate zeolite catalyst to provide a relatively high octane gasoline product.
摘要:
An improved process for stripping, or desorbing, entrained hydrocarbon material and, where present, sulfur-containing material, from a catalyst mixture recovered from a catalytic cracking reaction zone is described which comprises:(a) providing a quantity of catalyst mixture containing entrained hydrocarbon material and, optionally, sulfur-containing material, in at least one stripping zone in which a stripping gas removes said entrained hydrocarbon material and, where present, sulfur-containing material, the catalyst mixture comprising, as a first catalyst component, an amorphous and/or large pore crystalline cracking catalyst and, as a second catalyst component, a shape selective medium pore crystalline silicate zeolite catalyst, said first and second catalyst components being present in admixture within a common stripping zone or segregated into separate stripping zones; and,(b) conducting an exothermic reaction within the common stripping zone or within the separate stripping zone containing segregated second catalyst component, the heat released by the exothermic reaction providing an increase in the temperature of the catalyst in the stripping zone which results in the removal of a greater quantity of entrained hydrocarbon material and, where present, sulfur-containing material, than that occurring in the absence of such exothermic reaction.
摘要:
High purity alpha-alumina bodies useful as catalyst supports are made by peptizing boehmite alumina in an acidic mixture containing fluoride anions, extruding the peptized alumina into shaped bodies and drying and calcining the bodies. The alpha-alumina bodies are characterized by a narrow pore-size distribution, having 85 percent of the total pore volume comprising pores of a diameter of from 10,000 to 200,000 Angstroms and by a surface area of less than one square meter per gram.
摘要:
A process is provided for converting feedstock hydrocarbon compounds over a catalyst composition which comprises clay and a zeolite component, at least one of which has been treated with a phosphorus-containing compound, for example, ammonium dihydrogen phosphate or phosphoric acid, and which is spray dried at a low pH, preferably lower than about 3. An embodiment of the present invention comprises an improved catalytic cracking process to produce high octane gasoline and increased lower olefins, especially propylene and butylene.
摘要:
A catalytic cracking process for converting a hydrocarbon fraction, preferably boiling in the range of a heavy gas oil, is disclosed in which the cracking catalyst is a large crystal fully crystalline zeolite Beta having a broad range of silica-to-alumina mole ratios, i.e. 20->1000. The zeolite Beta catalyst is synthesized with a nitrogenous organic chelating agent, such as a tertiary alkanolamine, preferably triethanolamine, in the synthesis mixture along with at least one source of organic directing agent such as tetraethylammonium hydroxide, tetraethylammonium bromide and tetraethylammonium fluoride. The zeolite Beta can be used as a stand alone catalyst or an additive catalyst for hydrocarbon cracking reactions along with another molecular seive type catalyst such as a faujasite catalyst or ZSM-5. The large crystal zeolite Beta can also be treated with a source of phosphorus to enhance the properties of the zeolite.
摘要:
The catalytic cracking of a hydrocarbon oil to provide a product of increased octane number and increased light olefin content is carried out employing a cracking catalyst composition containing both a large port crystalline zeolite component and a ZSM-57 zeolite component.
摘要:
The catalytic cracking of a hydrocarbon oil to provide a product of increased octane number and increased light olefin content is carried out employing a cracking catalyst composition containing both a large pore crystalline zeolite component and a ZSM-57 zeolite component.