Abstract: A method for metathesizing at least two gaseous olefins using a moving catalyst bed gas phase metathesis reactor and counter current flowing subdivided solid catalyst.

Abstract: A catalyst and process is disclosed to selectively upgrade a paraffinic feedstock to obtain an isoparaffin-rich product for blending into gasoline. The catalyst comprises a support of a tungstated oxide or hydroxide of a Group IVB (IUPAC 4) metal, a phosphorus component, and at least one platinum-group metal component which is preferably platinum. The catalyst has a structure other than a heteropoly anion structure.

Abstract: A process is disclosed for the preferential conversion to 2-butene of a stream containing C4 compounds including 1-butene and 2-butene. The process involves mixing the C4 stream with a first hydrogen stream to form a feed stream, hydroisomerizing the feed stream in the presence of a first hydroisomerization catalyst in order to convert at least a portion of the 1-butene to 2-butene, thereby producing a hydroisomerization effluent, passing the hydroisomerization effluent through a fractionation column to form a top stream comprising isobutane and isobutylene and a bottoms stream comprising 2-butene, withdrawing a recycle stream from said fractionation column at a location above the feed point at which the weight ratio of 1-butene to 2-butene is high, and combining the recycle stream with at least one of the C4 stream and the feed stream upstream from the hydroisomerization catalyst. A corresponding apparatus also is disclosed.

Abstract: A method for metathesizing at least two olefins using a fluidized bed metathesis reactor and a finely subdivided solid catalyst.

Abstract: An integrated method that comprises a hydrocarbon thermal cracking operation to form at least one olefin product, coupled with dimerization and metathesis operations, the dimerization operation forming additional feed material for the metathesis operation, and the metathesis operation forming additional amounts of olefin product.

Abstract: A C4-olefin mixture having a 1,3-butadiene content of from 100 to 500 ppm and a content of 1,2-dienes of less than 10 ppm is described. The present invention further provides a process for preparing this C4-olefin mixture and provides for its use in a metathesis reaction for preparing 2-pentene and/or 3-hexene.

Abstract: A process is described for the preparation of a heterogeneous catalyst containing rhecnium as active component and C)an inert carrier medium. characterized in that said inert carrier is previously treated with a silanizing compound containing chlorine, before the laying of the active component on the carrier, and the activation of the heterogeneous catalyst takes place by means of thermal treatment followed by a rapid final cooling. The catalyst is particularly active in metathesis reactions of olefins.

Abstract: Process for preparing a compound having a nonaromatic C—C double or triple bond (compound A) from another compound or a mixture of other compounds having a nonaromatic C—C double or triple bond (compound B), which comprises bringing the compound (B) into contact with a heterogeneous catalyst comprising carbides or oxycarbides of a transition element at from 50 to 500° C.

Abstract: The invention relates to a method for producing hydrocarbons having a modified carbon skeleton by reacting aliphatic hydrocarbons a) with themselves, b) with another aliphatic hydrocarbon or c) with aromatic alkyl substituted hydrocarbons, in the presence of a metal organic catalyst or the hybrid thereof, at a temperature of between 20–400° C. and a pressure of between 0.2–100 bars, wherein the reaction takes place in the presence of hydrogen.

Abstract: A process for the production of propylene from the metathesis of ethylene and 2-butene is disclosed wherein a mixed C4 stream is first treated to enrich and separate the 2-butene from 1-butene and isobutene by isomerization of 1-butene and concurrent fractional distillation of the 2-butene and isobutene to provide the 2-butene feed the metathesis with ethylene. In addition the mixed C4 stream may be treated to remove mercaptans and dienes prior to 2-butene enrichment.

Abstract: In order to maximize the production of propylene when the external supply of ethylene is limited, the C4 cut from a hydrocarbon cracking process is first subjected to autometathesis prior to any isobutylene removal and without any ethylene addition. This favors the reactions which produce propylene and pentenes. The ethylene and propylene produced are then removed leaving a stream of the C4's and heavier components. The C5 and heavier components are then removed leaving a mixture of 1-butene, 2-butene, isobutylene, and iso- and normal butanes. The isobutylene is next removed preferably by a catalytic distillation hydroisomerization de-isobutyleneizer. The isobutylene-free C4 stream is then mixed with the product ethylene removed from the autometathesis product together with any fresh external ethylene needed and subjected to conventional metathesis producing additional propylene.

Abstract: The invention relates to modified supported catalysts based on Re2O7/?-Al2O3 for use in the preparation of cycloalkadienes in a metathesis reaction, a process for preparing cycloalkadienes in the presence of these supported catalysts and the use of the resulting cycloalkadienes for the preparation of fragrances.

Abstract: Ring opening cross metathesis of secondary non-cyclic hydrocarbons with cyclic unsaturated hydrocarbons having 8 carbon atoms or more to produce corresponding unsaturated product hydrocarbons having more than 8 carbon atoms.

Abstract: A method for forming propylene wherein ethylene is employed as a primary feed material in a combination of steps comprising dehydration, skeletal isomerization, and metathesis to form a versatile product mix that can contain one or more of propylene, gasoline, MTBE, and propylene oxide.

Abstract: The present invention relates to a process for preparing cycloalkadienes using supported catalysts based on Re2O7/?-Al2O3 and also to the use of the resulting cycloalkadienes for the preparation of fragrances.

Abstract: The present invention relates to supported catalysts based on Re2O7/(—Al2O3 for use in the preparation of cycloalkadienes in a metathesis reaction, a process for preparing cycloalkadienes in the presence of these supported catalysts and also the use of the resulting cycloalkadienes for preparing fragrances.

Abstract: A method for forming high purity 1-butene wherein a feed composed of pentenes and hexenes is subjected to metathesis with ethylene to form a mixture containing propylene, 1-butene, 2-butenes, pentenes, and hexenes, and high purity 1-butene is separately recovered from the mixture by simple distillation.

Abstract: A method for making propylene from alpha olefins, internal linear olefins and isoolefins wherein the alpha olefins are subjected to a combination of hydrogenation and double bond isomerization to form additional internal linear olefins, the internal linear olefins are separated from the isoolefins and disproportionated with ethylene to form a propylene product, while the thus separated isoolefins are subjected to skeletal isomerization to form yet additional internal linear olefins to be converted into yet additional propylene product.

Abstract: The present invention relates to a process for the metathesis reaction of unsaturated organic compounds.

Abstract: A process for the alkylation of paraffins with olefins includes contacting the paraffin with the olefin under alkylation conditions with a zeolite having an AAI number of at least about 1.0. In a preferred process isobutane is alkylated with cis-2-butene to produce a high octane (RON) gasoline product containing trimethylpentane isomers.

Abstract: Process for preparing a supported catalyst (catalyst C) comprising a support (support S) and an active component (activator A), wherein

Abstract: A C3 to C6 hydrogen cut from a cracking unit is processed for the conversion of olefins to propylene and hexene via autometathesis. The autometathesis of a mixed normal butenes feed in the presence of a metathesis catalyst operates without any ethylene in the feed mix to the metathesis reactor. Some fraction of the 2-butene feed may be isomerized to 1-butene and the 1-butene formed plus the 1-butene in the feed react rapidly with the 2-butene to form propylene and 2-pentene. The feed to the reactor also includes the recycle of the 2-pentene formed in the reactor with unreacted butenes to simultaneously form additional propylene and hexene. In one embodiment, some or all of the 3-hexene formed in the reaction is isomerized to 1-hexene. In another embodiment, some portion of the 3-hexene produced in the main metathesis reaction is reacted with ethylene to produce 1-butene without the need for superfractionation.

Abstract: An olefin metathesis catalyst consists essentially of a transition metal or oxide thereof supported on a high purity silica support possessing low amounts of acidic or basic sites such that in the reaction of pure butene-1 over said catalyst under metathesis reaction conditions the reaction possesses a weight selectivity to hexene-3 of at least 55 wt %.

Abstract: For the selective production of propylene from an olefinic C4 fraction, a process is implemented that successively comprises: 1) the selective hydrogenation of butadiene with isomerization of butene-1 into butene-2; 2) the separation by distillation of a mixture that is rich in isobutene and butene-1 at the top and a fraction that is rich in butene-2 at the bottom; 3) the skeletal isomerization of isobutene into n-butenes on the top fraction, with recycling in stage 1; and 4) the metathesis of the butene-2-rich fraction with ethylene.

Abstract: Ethylene and hexene-1 are produced from butene-1 by metathesis of butene-1 and isomerization of the hexene-3 produced therein to hexene-1. The initial starting material is a mixed butene stream wherein butene-1 is isomerized to butene-2 with isobutylene being separated therefrom, followed by isomerization of butene-2 to butene-1, with the butene-1 being the feed to the metathesis.

Abstract: A process for production, from an olefinic C4 fraction, on the one hand, of high-purity isobutene and, on the other hand, of propylene by metathesis is described. The process comprises three successive stages: 1) the selective hydrogenation of butadiene with isomerization of butene-1 into butene-2 up to thermodynamic equilibrium; 2) the separation by isobutene at the column head that integrates the hydroisomerization of n-butenes, allowing a butene-2 fraction at the bottom, and 3) the metathesis of the butene-2 fraction with ethylene. By this process, it is possible to produce in a very selective way high-purity isobutene and polymerization-quality propylene.

Abstract: A process for preparing cyclopentene oligomer mixtures of the formula I comprises reacting in a homogeneously or heterogeneously catalyzed metathesis reaction a hydrocarbon mixture which contains cyclopentene and acyclic monoolefins and which originates from petroleum processing by cracking (C5 fraction); cyclopentene oligomers of the formula I obtainable by this process and their use are also described.

Abstract: A multistage process for preparing propene, in which the first stage is the reaction of 1-butene, 2-butene and isobutene to give propene, 2-pentene and 2-methyl-2-butene in the presence of a metathesis catalyst comprising at least one compound of a metal of transition group VIb, VIIb or VIII of the Periodic Table of the Elements; the second stage is separation of the propene and 2-pentene/2-methyl-2-butene formed; the third stage is reaction of the 2-pentene and 2-methyl-2-butene with ethehe to give propene, 1-butene and isobutene in the presence of a metathesis catalyst comprising at least one compound of a metal of transition group VIb, VIIb or VIII of the Periodic Table of the Elements; the fourth stage is separation of the propene and 1-butene/isobutene formed and returning the 1-butene and isobutene formed to the first stage.

Abstract: The metathesis process is used: (A) for the production of propylene from the metathesis of 2-butene and ethylene wherein the propylene product is removed concurrently by fractional distillation by which the removal of the propylene product disturbs the equilibrium concentration and allows for higher conversions; (B) for the production of detergent range olefins from the metathesis of C15 and heavier olefins with C9 and lighter olefins wherein the detergent range olefin product is removed concurrently by fractional distillation in which the removal of the detergent range olefin product disturbs the equilibrium concentration and allows for higher conversions with less side reactions; (C) for the production of 2-methyl-2-butene and propylene from the metathesis of 2-butene and isobutylene wherein the propylene product and 2-methyl-2-butene product is removed concurrently by fractional distillation in which the removal of the product disturbs the equilibrium concentration and allows for higher conversions; and (D

Abstract: The metathesis process is used: (A) for the production of propylene from the metathesis of 2-butene and ethylene wherein the propylene product is removed concurrently by fractional distillation by which the removal of the propylene product disturbs the equilibrium concentration and allows for higher conversions; (B) for the production of detergent range olefins from the metathesis of C15 and heavier olefins with C9 and lighter olefins wherein the detergent range olefin product is removed concurrently by fractional distillation in which the removal of the detergent range olefin product disturbs the equilibrium concentration and allows for higher conversions with less side reactions; (C) for the production of 2-methyl-2-butene and propylene from the metathesis of 2-butene and isobutylene wherein the propylene product and 2-methyl-2-butene product is removed concurrently by fractional distillation in which the removal of the product disturbs the equilibrium concentration and allows for higher conversions; and (D

Abstract: Novel condensation reactions used to produce 1,3-cyclohexadiene. Such a compound is an important precursor in the manufacture of high performance plastics, as one example, are provided. In the past, the production methods for such 1,3-cyclohexadiene required very complex reactions involving numerous process steps. Such a method has proven costly, difficult to properly monitor and control, and less than reliable to provide even low amounts of such a precursor compound. The inventive production methods thus permit a reduction in complexity and cost, and, with a single reaction step, facilitate quality measurements as to the product purity itself.

Abstract: Methods of regenerating a coked catalyst by treatment with a hydrogen-containing gas, where the coke is not removed from the catalyst via combustion with an oxygen-containing gas, are disclosed. The hydrogen-containing gas can be hydrogen itself, syngas (a mixture of hydrogen and carbon monoxide), or, if the catalyst is a dehydrogenation catalyst or if a dehydrogenation catalyst is in-line with the coked catalyst, the reaction product of the catalytic dehydrogenation of a C2-5 alkane, preferably ethane. The method is an improvement over conventional catalyst regeneration methods which first oxidize the coke to form carbon monoxide and an oxidized form of the catalyst, and then reduce the oxidized form of the catalyst so it can be re-used. The present method removes the coke without requiring an oxidation step.

Abstract: The present invention provides a catalyst and a process for metathesis of olefinic C4 cuts. The catalyst contains rhenium, caesium and delta alumina. The preferred catalyst contains at least one rhenium compound deposited on a support principally composed of alumina, treated at a temperature of more than 750° C., and modified by at least one caesium compound. Thus the duration of the cycle between two regeneration operations is substantially increased. Application to a process for the production of propylene from an olefinic C4 cut in three steps: selective hydrogenation of butadiene with isomerisation of 1-butene to 2-butene, separation by distillation of the major portion of the isobutene, and metathesis of the cut rich in 2-butene with ethylene.

Abstract: A C3 to C6 hydrogen cut from a cracking unit is processed for the conversion of olefins to propylene and hexene via autometathesis. The autometathesis of a mixed normal butenes feed in the presence of a metathesis catalyst operates without any ethylene in the feed mix to the metathesis reactor. Some fraction of the 2-butene feed may be isomerized to 1-butene and the 1-butene formed plus the 1-butene in the feed react rapidly with the 2-butene to form propylene and 2-pentene. The feed to the reactor also includes the recycle of the 2-pentene formed in the reactor with unreacted butenes to simultaneously form additional propylene and hexene. In one embodiment, some or all of the 3-hexene formed in the reaction is isomerized to 1-hexene. In another embodiment, some portion of the 3-hexene produced in the main metathesis reaction is reacted with ethylene to produce 1-butene without the need for superfractionation.

Abstract: The present invention relates to a process for the metathesis reaction of unsaturated organic compounds.

Abstract: The invention provides a homogeneous metathesis process for converting C4 to C10 olefins in a Fischer-Tropsch derived feedstock to C6 to C18 olefins, wherein a higher transitions group metal catalyst is used to metathesize a double bond on a linear portion of the olefin, provided that the double bond is at least three carbons away from a branch if the olefin is branched. The catalyst may include a metal-alkylidene complex and the metal may be ruthenium, osmium, tungsten, or iridium. A suitable catalyst is a Grubbs catalyst. The metathesis process includes a recycle process to maintain the reaction equilibrium, although ethylene can be extracted from the process if a recycle process is not used. A co-solvent is used to increase the product yield. The C6 to C18 olefin produced by the above process may be suitable for use as drilling fluids.

Abstract: The invention provides a process for the production of propylene by butene metathesis. The process includes contacting a feedstock, which contains butene selected from 1-butene, 2-butene and mixtures thereof, with a catalyst which includes a catalytic amount of at least one metal oxide selected from oxides of the transition metals. The contacting is under reaction conditions which include a temperature of 300-600 øC. and a pressure of 1 20 atmospheres, and converts the butene to propylene, thereby to produce a reaction product containing propylene. C5— and higher hydrocarbons produced by the metathesis are separated from the reaction product and are recycled to the reaction where they are contacted with the catalyst.

Abstract: The metathesis process is carried out in a reaction distillation column for: (A) for the production of propylene from the metathesis of 2-butene and ethylene; (B) for the production of detergent range olefins from the metathesis of C15 and heavier olefins with C9 and lighter olefins; (C) for the production of 2-methyl-2-butene and propylene from the metathesis of 2-butene and isobutylene and (D) for the production of tetramethylethylene from the metathesis of isobutylene with itself and/or the reaction of diisobutylene with the ethylene produced to produce neohexene.

Abstract: The process for preparing propene and hexene from a raffinate II feed stream comprising olefinic C4-hydrocarbons comprises a) a metathesis reaction in which butenes present in the feed stream are reacted with ethene in the presence of a metathesis catalyst comprising at least one compound of a metal of transition groups VIb, VIIb or VIII of the Periodic Table of the Elements to give a mixture comprising ethene, propene, butenes, 2-pentene, 3-hexene and butanes, using, based on the butenes, from 0.05 to 0.

Abstract: A process for preparing a paraffinic product stream in the gasoline, middle distillate fuel and lube ranges from a C2-5-containing feedstock and a C20+ paraffinic feedstock is described. The combined feedstocks are subjected to molecular averaging via dehydrogenation to form olefins, metathesis of the olefins, and rehydrogenation of the olefins to form paraffins. The product stream includes a fraction rich in paraffins the molecular weights of which are between those of the light and heavy paraffin feedstocks, plus some unconverted feeds. The product of the molecular averaging reaction can optionally be isomerized to improve the octane value, in the case of gasoline, or pour point, in the case of middle distillate fuels and lubes. The unconverted feedstocks can be recycled to extinction.

Abstract: The present invention relates to a process for preparing cycloalkadienes using supported catalysts based on Re2O7/&ggr;-Al2O3 and also to the use of the resulting cycloalkadienes for the preparation of fragrances.

Abstract: The present invention relates to supported catalysts based on Re2O7/(—Al2O3 for use in the preparation of cycloalkadienes in a metathesis reaction, a process for preparing cycloalkadienes in the presence of these supported catalysts and also the use of the resulting cycloalkadienes for preparing fragrances.

Abstract: A process for preparing C5/C6-olefins from an olefinic starting stream comprising C4-hydrocarbons comprises a) carrying out a metathesis reaction in the presence of a metathesis catalyst so as to convert the 1-butene, 2-butene and isobutene present in the starting stream into a mixture of C2-C6-olefins and butanes, b) firstly fractioning the resulting product stream by distillation to give a low boiler fraction A comprising C2-C4-olefins and butanes or C2-C3-olefins, which is discharged, and a high boiler fraction comprising C4-C8-olefins and butanes, c) fractioning the high boiler fraction from b) by distillation to give a low boiler fraction B comprising butenes and butanes, an intermediate boiler fraction C comprising pentene and methylbutene and a high boiler fraction D comprising hexane and methylpentene, d) where all or part of the fraction B and/or C are recirculated to the process step a) and the fraction D is discharged as product.

Abstract: The invention relates to modified supported catalysts based on Re2O7/&ggr;-Al2O3 for use in the preparation of cycloalkadienes in a metathesis reaction, a process for preparing cycloalkadienes in the presence of these supported catalysts and the use of the resulting cycloalkadienes for the preparation of fragrances.

Abstract: An olefin metathesis catalyst consists essentially of a transition metal or oxide thereof supported on a high purity silica support possessing low amounts of acidic or basic sites such that in the reaction of pure butene-1 over said catalyst under metathesis reaction conditions the reaction possesses a weight selectivity to hexene-3 of at least 55 wt %.

Abstract: A process for production of higher linear internal olefins from 1- and 2-butene feedstocks in one or a series of sequential catalytic reactive distillation columns containing olefin disproportionation and olefin isomerization catalysts.

Abstract: An improved catalyst composition for the metathesis of olefins comprises at least one porous mineral carrier based on alumina, at least one compound of rhenium, molybdenum, or tungsten, and further includes silicon in an oxide form.

Abstract: A process for production of higher linear internal olefins from 1- and 2-butene feedstocks in one or a series of sequential catalytic reactive distillation columns containing olefin disproportionation and olefin isomerization catalysts.

Abstract: Catalytic process for metathesis of olefins in the presence of a catalyst and a stabilizing agent that is injected into the reaction medium. Application in particular to rebalancing between one another the light olefins that are obtained from steam cracking or catalytic cracking (FCC), such as ethylene, propylene, butenes or pentenes.

Abstract: A process for preparing an ethylene-rich composition from a C3-5 paraffinic feedstock is described. The C3-5 paraffinic feedstock is subjected to molecular redistribution via dehydrogenation to form olefins, metathesis of the olefins, and rehydrogenation of the olefins to form paraffins. The product stream includes ethane, which is isolated and sent to an ethane or ethane/propane cracker (or, alternatively, a flexi-cracker, although this is less cost effective) to yield an ethylene-rich composition. The product stream also includes C3-5 paraffins, which can be recycled, and C6+paraffins, which can be used, for example, as solvents. Alternatively, they can be isomerized to form gasoline additives, or can be converted to aromatic compounds by subjecting them to reforming conditions, for example using the AROMAX™ process or platforming or rheniforming conditions.