Abstract:
There are provided aromatic conversion reactions for preparation of dialkyl benzenes, such as xylene and ethyltoluene, of enhanced para isomer content with a zeolitic catalyst composition of improved shape selectivity. The catalysts comprise certain zeolites which have been calcined at a high temperature of at least 649.degree. C. (i.e., 1200.degree. F.). These zeolites have a silica/alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12. Examples of such zeolites include ZSM-5 and ZSM-11.
Abstract:
An improved moving bed continuous catalytic cracking process for cracking hydrocarbon feedstocks, such as gas oil, in the absence of added hydrogen, which includes the use of a minute amount of dispersed platinum supported directly on a cracking catalyst. The trace of platinum induces a substantial increase in the heat efficiency with which coke on catalyst is converted to CO.sub.2 in the regenerator section with minimal or no detriment to the cracking reaction.
Abstract:
Non-hydrogenative endothermic catalytic cracking of hydrocarbon, particularly petroleum, fractions at relatively low pressures and high temperatures in a system where the endothermic heat required for cracking is supplied by catalyst as the heat transfer medium, which catalyst has been heated by burning coke deposited on the catalyst during cracking; and wherein a decomposable compound of platinum, palladium, ruthenium, iridium, osmium, rhodium or rhenium, is introduced into contact with the cracking catalyst during said process.
Abstract:
A catalytic process for cracking of gas oil is disclosed, wherein trace amounts of metals of Periods 5 and 6 of Group VIII or rhenium is added to the total catalyst inventory so as to enhance significant conversion of the CO in the regenerator while maintaining the efficiency of the cracking reaction at high levels.
Abstract:
An improved method for preparing a crystalline aluminosilicate zeolite having uniform pores and greater than 40 percent crystallinity which comprises forming a critical reaction mixture containing a source of at least two cations, silica, alumina and water, wherein at least about 70 weight percent of the alumina is provided to the reaction mixture by an alumina-containing clay being added thereto, and maintaining the reaction mixture at a temperature and pressure for a time necessary to crystallize the crystalline aluminosilicate from the reaction mixture. It is desirable to preform said reaction mixture into discrete particles such as pellets or extrudates which retain their shape and acquire substantial strength in the crystallization process.
Abstract:
There are provided aromatic conversion reactions for preparation of dialkylbenzenes, such as xylene and ethyltoluene, of enhanced para isomer content with a zeolitic catalyst composition of improved shape selectivity. The catalysts comprise certain zeolites which have been calcined at a high temperature of at least 649.degree. C. (i.e., 1200.degree. F.). These zeolites have a silica/alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12. Examples of such zeolites include ZSM-5 and ZSM-11.
Abstract:
A continuous process is described for manufacturing a wide variety of zeolites having selected crystal sizes and other desired characteristics. Selected raw materials are fed to a precursor tank of relatively large capacity, wherein the resultant zeolite precursor slurry is held at temperatures of up to 180.degree. F. for 4-16 hours, with high shear agitation, as an induction period. The slurry is sent to a plurality of crystallization tanks before it possesses a total solids content exceeding 10% by weight and a crystalline content exceeding 15% by weight of the total solids content. The crystallization tanks are preferably operated in two stages. The first crystallizing stage is held at a temperature of 180.degree.-250.degree. F. for 2-72 hours. The second crystallizing stage is held at a temperature greater than 250.degree. F. for 2-16 hours.
Abstract:
A process for the production of lubricant oil range hydrocarbon having increased viscosity index by oligomerization of lower olefins over medium pore shape selective acid zeolite catalyst. The preferred oligomerization process is conducted using 50 ppm to 5 weight percent of water vapor as cofeed, based on olefin and acid ZSM-5 zeolite.
Abstract:
Uniform droplets of a bead-forming liquid are produced by positioning the end of a capillary tube in the throat of a venturi. An immiscible fluid flowing through the venturi detaches the droplets from the end of the capillary tube to produce uniform, spherical droplets which harden into spheroidal beads which have a uniform size.
Abstract:
A single particle catalyst composition prepared by forming a homogeneous mixture containing iron, a hydrogel matrix and a crystalline acidic aluminosilicate zeolite having a silica-to-alumina ratio of at least 12, a pore size greater than about 5 angstrom units, and a contraint index of about 1 to 12.