摘要:
The present invention comprises a hydrocarbon-conversion process using an improved MgMxAPSO-31 molecular sieve which demonstrates a favorable combination of conversion and selectivity in aromatics conversion. The sieve comprises at least two divalent elements with narrow specific concentration limits in the framework structure having defined crystal characteristics. The element Mx may comprise one or more of manganese, cobalt, nickel, iron and zinc.
摘要:
The present invention comprises a hydrocarbon-conversion process using an improved MgAPSO-31 molecular sieve which demonstrates a favorable combination of conversion and selectivity in aromatics conversion. The sieve has a specific combination of crystal configuration, being limited in diameter and length, specified crystallinity as measured by an X-Ray Diffraction Index (XRDI), and a narrow range of magnesium content.
摘要:
The present invention comprises a hydrocarbon-conversion process using an improved MgMxAPSO-31 molecular sieve which demonstrates a favorable combination of conversion and selectivity in aromatics conversion. The sieve comprises at least two divalent elements with narrow specific concentration limits in the framework structure having defined crystal characteristics. The element Mx may comprise one or more of manganese, cobalt, nickel, iron and zinc.
摘要:
The present invention comprises a hydrocarbon-conversion process using an improved MgAPSO-31 molecular sieve which demonstrates a favorable combination of conversion and selectivity in aromatics conversion. The sieve has a specific combination of crystal configuration, being limited in diameter and length, specified crystallinity as measured by an X-Ray Diffraction Index (XRDI), and a narrow range of magnesium content.
摘要:
The present invention comprises an improved MgMxAPSO-31 molecular sieve and a catalyst composite which demonstrates a favorable combination of conversion and selectivity in aromatics conversion. The sieve comprises a at least two divalent elements with narrow specific concentration limits in the framework structure having defined crystal characteristics. The element Mx may comprise one or more of manganese, cobalt, nickel, iron and zinc.
摘要:
A process for forming a zeolite beta dielectric layer onto a substrate such as a silicon wafer has been developed. The zeolite beta is characterized in that it has an aluminum concentration from about 0.1 to about 2.0 wt. %, and has crystallites from about 5 to about 40 nanometers. The process involves first dealuminating a starting zeolite beta, then preparing a slurry of the dealuminated zeolite beta followed by coating a substrate, e.g. silicon wafer with the slurry, heating to form a zeolite beta film and treating the zeolite beta with a silylating agent.
摘要:
A riser reactor system for conversion of hydrocarbon feedstock to ethylene and propylene is described. The riser reactor system prevents riser reactors with a plurality of inlet ports for feeding gases having different compositions and for controlling the residence time of a gas catalyst within the riser reactor.
摘要:
A process to remove polymeric by-products from the product of an acetylene selective hydrogenation reactor has been developed. The product is generated by introducing hydrogen and a liquid hydrocarbon stream containing largely butadiene and some acetylenes to a reactor containing a catalyst effective for the selective hydrogenation of acetylenes. The product contains at least hydrogen, butadiene, and polymeric by-products. The pressure of the product is reduced and the product cooled. The cooled product is conducted to a low pressure flash drum to produce a hydrogen enriched stream and a butadiene and polymeric by-product-enriched stream. The hydrogen-enriched stream is removed. The butadiene and polymeric by-product is passed to a knockout drum to produce a stream enriched in butadiene and polymeric by-products having less than about 12 carbon atoms and a stream enriched in polymeric by-products having about 12 or more carbon atoms. The stream enriched in polymeric by-products having about 12 or more carbon atoms is removed from the process. Polymeric by-products containing less than about 12 carbon atoms may be removed from the remaining stream by conducting a solvent and the stream enriched in butadiene and polymeric by-products containing less than about 12 carbon atoms to an extractive distillation column. In the extractive distillation column, the butadiene and polymeric by-products containing less than about 12 carbon atoms are carried with the solvent and removed in a bottoms stream as an extract mixture while the butanes and butenes are removed in an extractive distillation overhead stream. The bottoms extract stream is conducted to a stripper column where the solvent and the polymeric by-products are separated from the butadiene.
摘要:
A hydrocarbon conversion process which utilizes a novel catalytic composite is disclosed. The catalyst composite comprises a platinum group metal component, a first modifier selected from Group IA and IIA elements of the Periodic Table, a second modifier component selected from the group of elements consisting of palladium, iridium, and osmium, and a third modifier component selected from the elements of Group IVA of the Periodic Table of the Elements. All of the catalytic components are located on a refractory oxide support having a nominal diameter (d) of from 50 to 10,000 microns. The catalytic composite is characterized in that the second modifier components is surface-impregnated upon the support in such a manner that the average concentration of the surface-impregnated second modifier component on the outside 0.2d micron catalyst layer is at least 2 times the average concentration of the second modifier component in 0.4d micron diameter center core of the catalyst where d is the nominal diameter, and wherein the first modifier metal component is uniformly impregnated. The process has been found to be most useful in the dehydrogenation of dehydrogenatable hydrocarbons.
摘要:
A Fischer-Tropsch type process produces hydrocarbons from carbon monoxide and hydrogen using a novel catalyst comprising moderated ruthenium on an inorganic oxide support. The preferred moderator is silicon. Preferably the moderator is effectively positioned in relationship to ruthenium particles through simultaneous placement on the support using reverse micelle impregnation.