Matches 401 - 450 out of 694 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >
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4982038 Oxidative methylation of organic compounds  
A method for the oxidative methylation of propylene to ethylene and butenes, isobutylene to isoprene, toluene to styrene and enthylbenzene and acetonitrile to acrylonitrile utilizing a series of...
4982035 Coupling process  
An alkene selected from ethene, propene, and mixtures thereof is coupled with an aromatic hydrocarbon having an active hydrogen on a saturated alpha-carbon in the presence of a supported potassium...
4982037 Process for selectively alkylating biphenyl  
Disclosed herein is a process for selectively synthesizing the para-isomer of alkylbiphenyl in the alkylation of biphenyl with propylene or butene, employing zeolite having a molar ratio of SiO 2 ...
4975179 Production of aromatics-rich gasoline with low benzene content  
A process is disclosed for the production of high octane gasoline rich in aromatics but containing a relatively low concentration of benzene. The process comprises the separation of C 6 fraction...
4973780 Alkylation of benzene in a moving bed  
An improved process for the alkylation of benzene in the presence of an alkylation catalyst. The catalyst bed may be caused to move in a direction countercurrent to the movement of the benzene and...
4973782 Preparation of 2,2-diethyltoluene  
A diethyltoluene mixture rich in 2,5-diethyltoluene and containing less tha 5% of the 3,5-diethyltoluene can be prepared by methylating 1,4-diethylbenzene with an excess of methanol in the presence...
4973781 Zeolite ZSM-57 and catalysis therewith  
This invention relates to a synthetic porous zeolite, identified as ZSM-57, a method for its preparation and use thereof in catalytic conversion of organic compounds. This crystalline material may...
4962255 Catalysts and process for the production of hydrocarbons and substitution of hydrocarbons  
A method of selective beta-alkylation of aromatic substrates such as naphthalene or a derivative thereof, comprising reacting the substrate with an alcohol or olefin alkylating agent in the...
4962256 Process for preparing long chain alkyl aromatic compounds  
Long chain alkyl aromatic compounds are prepared by alkylating an alkylatable aromatic compound with a long chain alkylating agent in the presence of catalyst comprising a synthetic porous...
4952546 Catalyst system for selective alkylation of toluene  
The object of the invention is a catalyst system for selective alkylation of toluene with propylene. The catalyst system contains metallic sodium on a K 2 CO 3 carrier and transition metal oxide,...
4950835 Novel silicon-modified catalyst Si/HZSM-5, it's preparation, and a process for synthesizing high purity p-dialkyl benzene from monoalkyl benzene by using said catalyst  
This invention relates to the preparation of a novel Si/HZSM-5 catalyst through vapor phase deposition of Si on the surface of HZSM-5 catalyst which is obtained by ion exchanging ZSM-5 catalyst....
4950823 Benzene upgrading reformer integration  
A process and apparatus are disclosed for the production of gasoline from a C 4 - fuel gas containing ethene and propene and catalytic reformate containing C 6 to C 8 aromatics. The C 4 - fuel...
4950824 Process for the production of 2,6-diisopropylnaphthalene  
A process for the production of 2,6-diisopropylnaphthalene is disclosed wherein an isopropylation reaction mixture containing isopropylated naphthalenes is subjected to transalkylation with a...
4950834 Alkylation of organic aromatic compounds in a dual bed system  
Cumene is produced in a catalytic distillation column reactor having an upper bed of Omega type molecular sieve catalyst and a lower bed of Y type molecular sieve catalyst. Benzene and propylene...
4946579 Chemical conversion processes utilizing catalyst containing crystalline galliosilicate molecular sieves having the erionite-type structure  
A crystalline, galliosilicate molecular sieve having the erionite-type structure and the following composition expressed in terms of oxide mole ratios in the anhydrous state: Ga 2 O 3 :xSiO 2 ...
4935574 Preparation of para-xylene by toluene methylation  
A silica catalyst that retains its high initial activity for a longer time is obtained by forming the catalyst from an aquasol that was obtained by mixing an alkali metal aluminate with an aqueous...
4921946 Hydrocarbon conversion process  
A hydrocarbon conversion process is disclosed which extends the useful life of a regenerable zeolite-containing hydrocarbon conversion catalyst. In one aspect of this process, a hydrocarbon feed...
4922053 Process for ethylbenzene production  
A process is disclosed for producing ethylbenzene from the catalytic alkylation of benzene in a multibed reactor wherein a portion of the normal overhead polyethylbenzene recycle stream is diverted...
4916100 Process for preparing a catalyst system for selective alkylation of toluene with propylene  
The object of the invention is a catalyst system for selective alkylation of toluene with propylene. The catalyst system contains metallic sodium which has been thermally decomposed from sodium...
4908341 Method for reactivating spent catalyst by contact with one or more aromatic compounds  
A method for regenerating a spent porous crystalline catalyst, optionally associated with a metal component such as noble and/or base metal(s), is described. The method comprises contacting the...
4899007 Aromatic conversion reactions with zeolitic catalyst composition of improved shape selectivity  
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...
4899008 Direct catalytic alkylation of mononuclear aromatics with lower alkanes  
Mononuclear aromatic hydrocarbons such as benzene and toluene are alkylated with C 2 -C 4 paraffins in the presence of an acidic zeolite catalyst such as ZSM-5 in a one-step process to produce...
4892646 Method for treating dewaxing catalysts  
A method for treating a porous crystalline catalyst optionally associated with a metal component such as a noble and/or base metal(s) is described. The method comprises contacting the catalyst with...
4891467 Selective synthesis of pseudocumene and durene  
A catalytic process is provided for the selective production of pseudocumene and durene by contacting a hydrocarbon feed containing benzene or a methyl substituted benzene under methylating...
4876408 Alkylation process using a catalyst having an increased selectivity for monoalkylation  
A process for treating a molecular sieve-containing alkylation catalyst to increase its selectivity for monoalkylation in which the alkylation catalyst is contacted with a feedstock comprising at...
4874504 pH control by bulky organic bases during noble-metal exchange of zeolite catalysts  
A method is disclosed which provides improved control over the noble-metal exchange of zeolite catalyst by using bulky organic bases to control pH during the metal loading step.
4871444 Distillate fuel quality of FCC cycle oils  
A method for improving the cetane number of an aromatic hydrocarbon oil such as FCC light cycle oil and thereby increase its value as a blending stock for diesel fuel or heating oil. In one...
4870222 Alkylation/transalkylation process  
A process for the production of a monoalkylated aromatic compound which minimizes the production of undesirable alkylating agent oligomers, while producing monoalkylaromatics in high yields. The...
4861457 Crystalline gallophosphate compositions  
A novel family of crystalline, microporous gallophosphate compositions is synthesized by hydrothermal crystallization at elevated temperatures from gallophosphate gels containing a molecular...
4851106 Process for the use of chromium-aluminum-phosphorus-oxide molecular sieve compositions  
Molecular sieve compositions having three-dimensional microporous framework structures of CrO 2 , AlO 2 and PO 2 tetrahedral oxide units are disclosed. These molecular sieves have an empirical...
4851602 Alkanes and alkenes conversion to high octane gasoline  
Method and means are described for the conversion of lower molecular weight paraffins and olefins to high octane gasoline rich in alkylated aromatics. In a two stage process catalyzed by...
4849570 Catalytic composition and process for the alkylation and transalkylation of aromatic hydrocarbons  
Superior aromatic alkylation and transalkylation performance is obtained with a novel catalytic composition comprising a hydrogen form mordenite incorporated with alumina. The superior performance...
4846956 Manganese-aluminum-phosphorus-silicon-oxide Molecular sieves  
Crystalline molecular sieves having three-dimensional microporous framework structures of MnO 2 , AlO 2 , SiO 2 and PO 2 tetrahedral oxide units are disclosed. These molecular sieves have an...
4844790 Hydrocarbon conversion processes using delaminated clay catalysts  
Delaminated clays whose X-ray diffraction patterns do not contain a distinct first order reflection are prepared from synthetic and natural swelling clays whose particles have a length-to-width...
4836912 Hydroconversion process using aromatic metal chelate compositions  
Disclosed are hydroconversion processes catalyzed by aromatic-metal chelate compositions which are deficient in hydrogen, are cross-linked, and which are comprised of two or more heteroatoms,...
4836911 Hydrocarbon conversion using silicon-substituted zeolite compositions  
Crystalline zeolitic aluminosilicates having at least some of its original framework aluminum atoms replaced by extraneous silicon atoms and having a mole ratio of oxides in the dehydrated state of...
4835329 Process for producing high octane gasoline  
An integrated process for the production of alkylate and etherate rich high octane gasoline streams comprising the etherification to produce MTBE and TAME in the presence of a high stoichiometric...
4827069 Upgrading light olefin fuel gas and catalytic reformate in a turbulent fluidized bed catalyst reactor  
A fluidized bed catalytic process for conversion of light olefinic gas feedstock containing ethene and propene to produce C 5 + hydrocarbons and for the conversion of catalytic reformate feedstock...
4822943 Production of para-diisopropylbenzene  
A process is disclosed whereby cumene and/or benzene is brought into contact propylene in the presence of a ZSM-12 catalyst to selectively produce para-diisopropylbenzene.
4814532 Process for producing alkylcyclopentadiene derivatives  
A process for producing an alkylcyclopentadiene derivative comprising the vapor-phase reaction of a cyclopentadiene derivative and an aliphatic lower alcohol in the presence of a basic crystalline...
4812536 Selective para-ethylation of toluene with magnesium compound-impregnated, crystalline, gallosilicate based, molecular sieve catalyst compositions  
Described are magnesium compound-impregnated catalyst compositions comprising a gallium-modified, crystalline silica molecular sieve, essentially free of aliminum, composited in an inorganic...
4795847 Preparation of 2,6-dialkyl-naphthalenes  
A process for the preparation of 2,6-dialkyl-naphthalenes comprising selectively alkylating naphthalene or 2-alkyl-naphthalene with alkylating agent in the presence of a zeolite catalyst at 250°...
4795550 Removal of trace olefins from aromatic hydrocarbons  
This invention presents a novel treating process for the removal of trace quantities of olefinic impurities from a hydrocarbon process stream. Specifically, this process operates at liquid phase...
4774379 Aromatic alkylation process  
A process for the alkylation of aromatic compounds employing silicalite of extremely low sodium content. A feedstock containing an aromatic substrate such as benzene is supplied along with an...
4761513 Temperature control for aromatic alkylation process  
The quench system for a toluene methylation process is improved by using the methylating agent as a quench medium that is introduced between sequential reaction zones. A stream of toluene and any...
4758327 Shock calcined crystalline silica catalysts  
A process for producing a thermally shock calcined crystalline silica comprising (A) precalcining a crystalline silica at a relatively low temperature, (B) very rapidly increasing the temperature...
4758328 Shock calcined aluminosilicate zeolites  
A process for producing a thermally shock calcined aluminosilicate zeolite comprising (A) precalcining an aluminosilicate zeolite at a relatively low temperature, (B) very rapidly increasing the...
4751340 Selective production of para-aromatics  
Alkylation of aromatics is effected by use of an alkylating agent, e.g., methanol, and novel alkylation catalysts containing non-zeolitic molecular sieves.
4740649 Conversion of aromatics over novel catalyst composition  
Feedstock comprising aromatic compounds is converted by isomerization, alkylation, disproportionation or transalkylation to product comprising aromatic compounds which differs from the feedstock...
4731497 Alkylation of aromatics with alpha-olefins  
H-mordenite has been shown to be unique in its ability to yield a high percentage of para-substitution of monoalkyl benzene by alkylation with long chain alpha-olefins. The process also yields a...
Matches 401 - 450 out of 694 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >