摘要:
A catalyst is presented for use in the production of linear alkylbenzenes. The catalyst includes two zeolites combined to improve the quality of the linear alkylbenzenes. The catalyst includes a first zeolite that is UZM-8 and a second zeolite that is a low silica to alumina ratio zeolite. The second zeolite is also cation exchanged with a rare earth elements to provide a zeolite that increases the alkylation of benzene while reducing the amount of skeletal isomerization.
摘要:
A new family of crystalline aluminosilicate zeolites has been synthesized. These zeolites are represented by the empirical formula. Mmn+Rr+Al(1-x)ExSivOz where M represents a combination of potassium and sodium exchangeable cations, R is a singly charged organoammonium cation such as the choline cation and E is a framework element such as gallium. These zeolites are similar to MCM-68 but are characterized by unique x-ray diffraction patterns and compositions and have catalytic properties for carrying out various hydrocarbon conversion processes.
摘要:
The subject process obtains a high yield of high-purity para-xylene from 2,4,4-trimethylpentene as contained in butene dimer. A process combination may include dimerization of the isobutene to obtain C8 iso-olefins and isoparaffins, aromatization of the dimerized C8 product, and recovery of high-purity para-xylene from the dimerized product by low-intensity crystallization. Aromatization is effected using a catalyst comprising a large-pore molecular sieve. Each of the processing steps may be tailored to the overall objective of high para-xylene yield from a relatively inexpensive feedstock.
摘要:
A method for producing a zeolite catalyst includes mixing a zeolite material with a filler material comprising transition phase and alpha alumina, a porosity enhancing agent, and water to produce a paste; mulling the paste; extruding the paste to produce a shaped extrudate; and drying and calcining the shaped extrudate to produce a zeolite catalyst, wherein the zeolite catalyst has a total porosity greater than about 0.60 ml/gm and greater than 15% of a total pore volume of pores in the range from about 550 Å to about 31,000 Å.
摘要:
One exemplary embodiment can be a method for processing polyisopropylbenzene for producing cumene. The method can include passing a transalkylation feed stream to a transalkylation zone, and passing a reaction product to a separation zone. Typically, the separation zone produces a stream including di-isopropylbenzene, tri-isopropylbenzene, and one or more heavy compounds. Moreover, the stream may include at least about 0.7%, by weight, of the one or more heavy compounds based on the weight of the di-isopropylbenzene, tri-isopropylbenzene, and the one or more heavy compounds in the stream, and at least a portion of the stream is recycled to the transalkylation zone.
摘要:
The alkylation of aromatic compound with acyclic mono-olefin is effected at low aromatic compound to mono-olefin ratios with reduced co-production of heavies. In the processes a small crystal, acidic FAU molecular sieve is used as a catalyst under alkylation conditions. This invention also relates to catalysts containing small crystal, acidic FAU molecular sieve and at least one other acidic catalytic component.
摘要:
A process for converting polyalkylaromatics to monoalkylaromatics, particularly cumene, in the presence of a modified LZ-210 zeolite catalyst is disclosed. The process attains greater selectivity, reduced formation of undesired byproducts, and increased activity.
摘要:
Disclosed is a process and apparatus for alkylating light olefin with benzene at near but less than full conversion of the olefin. We have found that stopping below full conversion of the olefin maximizes yield of monoalkylbenzene.
摘要:
A process for converting polyalkylaromatics to monoalkylaromatics, particularly cumene, in the presence of a modified LZ-210 zeolite catalyst is disclosed. The process attains greater selectivity, reduced formation of undesired byproducts, and increased activity.
摘要:
The present invention provides a catalyst particle of an inner core, an outer layer surrounding and bonded to the inner core, the outer layer of a zeolite beta catalyst, and the outer layer having a volumetric fraction from about 0.17 to about 0.62 of the entire catalyst particle.