摘要:
A new xylene isomerization process which is capable of converting ethylbenzene and non-aromatic exhaustively while selectively converting xylenes to thermal equilibrium in mixed EB/xylene feeds is proposed. The new process employs a two component catalyst system; each of the components contains a strong hydrogenation metal and a zeolite. The zeolite of each of the two components differs from the other in its selectivity for xylene isomerization and its capacity to deethylete ethylbenzene. That selectivity for xylene isomerization is described by xylene diffusion properties of the zeolite. In one embodiment of the invention, ZSM-5 of greater than 1 micron crystal size and an alpha value of greater than 100 in a first component and ZSM-5 of less than 1 micron crystal size and an alpha of less than 100 in a second catalyst component satisfy the diffusion properties which allow for the exhaustive conversion of ethyl benzene and non-aromatics and the selectivity for xylene isomerization of typical xylene isomerization feeds. In a preferred embodiment, the feed is cascaded over the first component and then the aforementioned second component.
摘要:
The elution of zinc from zinc-impregnated zeolite catalysts is minimized by incorporating gallium into the catalyst composition. Optionally, palladium may also be included in the composition. The catalyst composition is used to effect the conversion of propane in hydrocarbon streams to aromatic hydrocarbons.
摘要:
A feedstock of low molecular weight oxygenates such as methanol and/or dimethylether is contacted with a mildly presteamed or hydro-thermally treated zeolite catalyst in a reaction zone to produce liquid hydrocarbons in the gasoline boiling range. The pretreated zeolite catalyst has an .alpha.-value (acid cracking activity) substantially the same as the .alpha.-value of fresh unsteamed catalyst and shows increased stability and resistance to aging under oxygenate conversion conditions of elevated temperature and pressure.
摘要:
A catalytic process is provided for converting gaseous feedstocks containing ethane to liquid aromatics by contacting said gaseous feeds in the absence of added air or oxygen, under conversion conditions, with a crystalline zeolite catalyst having incorporated therein a minor amount of gallium, thereby converting the ethane in the feedstock to aromatics and recovering a liquid mixture of benzene, toluene and xylene.
摘要:
Alkylation of aromatics, e.g. ethylbenzene preparation, with minimized o-xylene make by contacting with olefin alkylating agent in the presence of ZSM-5 crystals having a diffusion rate constant of at least about 100 sec.sup.-1 .times.10.sup.-6 and an alpha value of less than about 100 prepared from a non-organic forming mixture comprising a silica source of precipitated silica having a particle size of 1 to 500 microns.
摘要:
Petroleum resid is upgraded in an improved process to produce a low pour point 650.degree.-775.degree. F. fraction without disturbing the product characteristics of other distillate boiling range fractions. The 650.degree.-775.degree. F. fraction is dewaxed separately from the remaining hydrodesulfurized product.
摘要:
A zeolite of improved stability for use in acid-catalyzed reactions is prepared by mildly presteaming the catalyst under controlled conditions of temperature, time, and steam partial pressure. The resulting catalyst retains nearly the same activity as that of a fresh unsteamed catalyst.
摘要:
Paraffinic hydrocarbons of 2 to 16 carbon atoms are converted to aromatic in the presence of oxygen and a zeolite catalyst incorporating oxidative dehydrogenative metal or metal oxide components
摘要:
Isomerization of xylenes admixed with other alkyl aromatics of at least eight carbon atoms and with normal or slightly branched paraffins is conducted at 800.degree.-1000.degree. F. with a zeolite like zeolite ZSM-5 of reduced acid activity.
摘要:
An improved zeolite catalyst containing at least one noble metal and at least one alkali metal wherein the amount of the latter component exceeds the cationic exchange capacity of the zeolite has been found to be highly useful for catalytic reforming.