Abstract: The invention provides a method for converting an olefinic hydrocarbon feedstock to propylene comprising: contacting a hydrocarbon feedstock under catalytic cracking conditions with a catalyst comprising a catalyst selected from the group consisting of SAPO catalysts, MeAPO catalysts, MeASPO catalysts, ElAPO catalysts, ElASPO catalysts, rare earth exchanged catalysts from any of the preceding groups, and mixtures thereof, under cracking conditions to selectively produce propylene. The invention further provides a method for stabilizing a catalyst to steam from the foregoing group by ion exchange with a rare earth metal.

Abstract: A catalyst composition, a process for producing the composition, and a hydrotreating process for converting a hydrocarbon stream such as, for example, gasoline, to olefins and C6 to C8 aromatic hydrocarbons such as toluene and xylenes are disclosed. The catalyst composition comprises a zeolite and a promoter. The process for producing the composition comprises the steps: (1) combining a zeolite with a promoter under a condition sufficient to incorporate the zeolite with the promoter to produce a first promoted zeolite; (2) incorporating the first promoted zeolite with a second promoter to produce a second promoted zeolite; and (3) heating the second promoted zeolite. The hydrotreating process comprises contacting a hydrocarbon stream with the catalyst composition under a condition sufficient to effect the conversion of a hydrocarbon to an olefin and a C6 to C8 aromatic hydrocarbon.

Abstract: A process for cracking an olefin-containing hydrocarbon feedstock which is selective towards light olefins in the effluent, the process comprising passing a hydrocarbon feedstock containing one or more olefins through a reactor containing a crystalline silicate selected from an MFI-type crystalline silicate having a silicon/aluminium atomic ratio of at least 180 and an MEL-type crystalline silicate having a silicon/aluminium atomic ratio of from 150 to 800 which has been subjected to a steaming step, at an inlet temperature of from 500 to 600° C., at an olefin partial pressure of from 0.1 to 2 bars and the feedstock being passed over the catalyst at an LHSV of from 5 to 30h−1 to produce an effluent with an olefin content of lower molecular weight than that of the feedstock.

Abstract: Disclosed is a method for treating naphtha. The method comprises providing naphtha feed, and the naphtha feed comprises naphthene ring-containing compounds. The naphtha feed is contacted with a ring opening catalyst containing a Group VIII metal under conditions effective to ring open the naphthene rings to form a ring opened product. The ring open product can then be contacted with a catalytic cracking catalyst under effective cracking conditions to form an olefin product. The olefin product will be particularly high in ethylene and propylene content.

Abstract: A method of increasing total diluent conversion in a process for the conversion of cracked gasoline and a first diluent comprising iso-pentane to aromatics and light olefins by contacting the cracked gasoline, the first diluent and a second diluent comprising either propane or 1-hexene with a zeolite catalyst containing phosphorus. The zeolite catalyst comprises a calcined, acid-leached zeolite and phosphorus. Also described is a method of making such catalyst.

Abstract: A process for cracking an olefin-rich hydrocarbon feedstock which is selective towards propylene in the effluent, the process comprising contacting a hydrocarbon feedstock containing one or more olefinic components of C4 or greater with a crystalline silicate catalyst to produce an effluent having a second composition of one or more olefinic components of C3 or greater, the feedstock and the effluent having substantially the same olefin content by weight therein characterized in that ethylene is added to the feedstock before the feedstock contacts the catalyst.

Abstract: A process for producing polymers from olefins selectively produced from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is introduced into a process unit comprised of a reaction zone, a stripping zone, a catalyst regeneration zone, and a fractionation zone. The naphtha feedstream is contacted in the reaction zone with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures ranging from about 500° to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia. Vapor products are collected overhead and the catalyst particles are passed through the stripping zone on the way to the catalyst regeneration zone. Volatiles are stripped with steam in the stripping zone and the catalyst particles are sent to the catalyst regeneration zone where coke is burned from the catalyst, which is then recycled to the reaction zone.

Abstract: A process for producing polypropylene from olefins selectively produced from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500° C. to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia.

Abstract: A C4+naphtha hydrocarbon feed is converted to light olefins and aromatics, by contacting the feed with a catalyst containing ZSM-5 and/or ZSM-11, a substantially inert matrix material such as silica and/or clay, having less than about 20 wt % active matrix material based on total catalyst composition, and phosphorus.

Abstract: The invention is related to a two step process wherein the first step comprises cracking an olefinic naphtha resulting in a cracked product having a diminished total concentration of olefinic species. The second step comprises hydroprocessing at least a portion of the cracked product, especially a naphtha fraction, to provide a hydroprocessed cracked product having a reduced concentration of contaminant species but without a substantial octane reduction.

Abstract: A process for producing propylene from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500° C. to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia. A separate stream containing aromatics may be co-fed with the naphtha stream.

Abstract: Disclosed is a method for producing ethylene and propylene from a hydrocarbon feedstock by catalytic conversion, which comprises contacting, in a reactor, a hydrocarbon feedstock comprising 20% by weight or more, based on the weight of the hydrocarbon feedstock, of at least one C4-C12 olefin with a zeolite-containing catalyst, wherein the zeolite in the zeolite-containing catalyst satisfies the following requirements: (1) the zeolite is an intermediate pore size zeolite having a pore size of from 5 to 6.5 Å, (2) the zeolite contains substantially no proton, (3) the zeolite contains at least one metal selected from the group consisting of metals belonging to Group IB of the Periodic Table, and (4) the zeolite has an SiO2/Al2O3 molar ratio of from 200 to 5,000, to effect a catalytic conversion reaction of the hydrocarbon feedstock, thereby obtaining a reaction mixture containing ethylene and propylene; and separating the ethylene and propylene from the reaction mixture.

Abstract: Catalyst for steam cracking reactions consisting of pure mayenite having the general formula:

Abstract: A process for producing polymers from C2-C4 olefins selectively produced from a catalytically-cracked or thermally-cracked naphtha stream is disclosed herein. A mixture of the naphtha stream and a stream of steam is feed into a reaction zone where it is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions that include temperatures from about 500° C. to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia.

Abstract: A composition, a process for producing the composition, and a hydrocarbon conversion process for converting a hydrocarbon stream such as, for example, gasoline, to olefins and C6 to C8 aromatic hydrocarbons such as toluene and xylenes are disclosed. The composition comprises a silylated catalyst which comprises a zeolite, a clay or silica, and a promoter. The process for producing the composition comprises the steps: (1) combining a zeolite with a clay or silica and a promoter under a condition sufficient to bind the clay to the zeolite to produce a clay-bound zeolite; (2) heating the clay-bound zeolite to produce a modified zeolite; and (3) silylating the modified zeolite with a silylating agent. The hydrocarbon conversion process comprises contacting a hydrocarbon stream with the catalyst composition under a condition sufficient to effect the conversion of a hydrocarbon to an olefin and a C6 to C8 aromatic hydrocarbon.

Abstract: A hydrocarbon feed containing C4-C7 olefins and/or paraffins is converted to light olefins, by contacting the feed with a catalyst containing ZSM-5 and/or ZSM-11, having an initial silica to alumina ratio greater than about 300:1, and phosphorus.

Abstract: A catalytic pyrolysis process for production of ethylene and propylene from heavy hydrocarbons, comprises that heavy hydrocarbons are contacted with a pillared interlayered clay molecular sieve and/or phosphorus and aluminum or magnesium or calcium modified high silica zeolite having a structure of pentasil contained catalysts in a riser or downflow transfer line reactor in the presence of steam and catalytically pyrolysed at a temperature of 650° C. to 750° C. and a pressure of 0.15 to 0.4 MPa for a contact time of 0.2 to 5 seconds, a weight ratio of catalyst to feedstock of 15:1 to 40:1 and a weight ratio of steam to feedstock of 0.3:1 to 1:1. The yields of ethylene and propylene by the present invention are over 18 wt %.

Abstract: Processes and apparatus for providing improved catalytic cracking, specifically improved recovery of olefins, LPG or hydrogen from catalytic crackers. The improvement is achieved by passing part of the wet gas stream across membranes selective in favor of light hydrocarbons over hydrogen.

Abstract: A process for selectively producing C.sub.2 -C.sub.4 olefins from a catalytically cracked or thermally cracked naphtha stream is disclosed. A mixture of the naphtha stream and a stream of steam is feed into a reaction zone where it is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500 to 650.degree. C. and a hydrocarbon partial pressure from about 10 to 40 psia.

Abstract: A process for selectively producing C.sub.3 olefins from a catalytically cracked or thermally cracked naphtha stream. The naphtha stream is introduced into a process unit comprised of a reaction zone, a stripping zone, a catalyst regeneration zone, and a fractionation zone. The naphtha feedstream is contacted in the reaction zone with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures ranging from about 500.degree. to 650.degree. C. and a hydrocarbon partial pressure from about 10 to 40 psia. Vapor products are collected overhead and the catalyst particles are passed through the stripping zone on the way to the catalyst regeneration zone. Volatiles are stripped with steam in the stripping zone and the catalyst particles are sent to the catalyst regeneration zone where coke is burned from the catalyst, which is then recycled to the reaction zone.

Abstract: The invention provides a process for improving the conversion of a hydrocarbon feedstock to light olefins comprising mixing a hydrocarbon feedstock with a diolefin to form a mixture; and thereafter contacting the mixture with a zeolite cracking catalyst. Preferably the catalyst is contacted at a reaction temperature within the range of about 500.degree. C. to about 750.degree. C. and the feedstock flows at a weight hourly space velocity in the range of about 0.1 Hr.sup.-1 WHSV to about 100 Hr.sup.-1 WHSV. The diolefin can be a straight, branched, or cyclic hydrocarbon having at least two II bonds. Preferably diolefin is a hydrocarbon of 4 to 20 carbons.

Abstract: A process for producing catalyst compositions for converting a cracked gasoline feedstock to a product comprising incremental aromatics and lower olefins. The catalyst compositions produced thereby. A process for converting a cracked gasoline feedstock to a product comprising incremental aromatics and lower olefins.

Abstract: An improved supported catalyst containing mixed strontium and other alkaline earth oxides deposited on a sintered low surface area porous catalyst carrier (or support) precoated with mixed lanthanum and other rare earth oxides, represented by the formula:A.sub.a SrO.sub.b (x) /R.sub.c LaO.sub.d (y) /S,wherein, A is alkaline earth element selected from Be, Mg, Ca, Ba or a mixture thereof; Sr is strontium, O is oxygen; R is rare earth element selected from Ce, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu or a mixture thereof; La is lanthanum; S is catalyst support selected from sintered low surface area porous refractory inert solids comprising of alumina, silica, silica-alumina, silicon carbide, zirconia, hafnia or a mixture thereof; a is A/Sr mole ratio in the range of about 0.01 to about 10; b is number of oxygen atoms needed to fulfill the valence requirement of alkaline earth elements (A.sub.a Sr); c is R/La mole ratio in the range of about 0.

Abstract: A process for selectively producing C.sub.2 -C.sub.4 olefins from a catalytically cracked or thermally cracked naphtha stream. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500 to 650.degree. C. and a hydrocarbon partial pressure from about 10 to 40 psia.

Abstract: A hydrocarbon conversion process in which the rate of coke formation is reduced without a significant sacrifice in light olefin and BTX yield by the use of a silylated, stabilized metal promoted zeolite catalyst. Another embodiment includes a novel silylated spinel/zeolite catalyst. Another embodiment includes a process for producing a zinc or gallium promoted zeolite in which the promoter is stabilized by a high temperature water vapor treatment in the presence of a metal oxide such as alumina and thereafter the stabilized catalyst precursor is calcined and silylated.

Abstract: A process to convert propane into ethylene, propene, and C.sub.4 olefins, is provided. This process comprises: contacting propane with a composition under converting conditions.

Abstract: The invention provides an activated silica enriched mazzite having a chemical formula in the anhydrous state, expressed in molar ratios of:a M.sub.2/n O; Al.sub.2 O.sub.3 ; b SiO.sub.2 ;with a variation from 0 to 0.5, M being an alkaline cation of valency n and b being greater than 7, and which has an acid strength corresponding to an amount of heat measured by ammonia absorption microcalorimetry, greater than 190 KJ/mol, and a pore volume, measured by cyclohexane adsorption, greater than 0.09 ml/g. The activated mazzites are useful in the conversion of hydrocarbons, in particular, the isomerization of C.sub.4 to C.sub.8 paraffin, and as molecular sieves in processes for the separation of hydrocarbons.

Abstract: A process for the production of compounds useful as fluorescent whitening agents of formula: ##STR1## in which X and Y, are as defined herein and n is 1 or 2, comprises A) diazotising one mole of an amine of formula: ##STR2## (2A) to produce a diazonium compound of the formula: ##STR3## (2) in which G.sub.1 is a counter ion; and diazotising one mole of an amine of formula: ##STR4## (3A) to produce a diazonium compound having the formula: ##STR5## (3); and B) reacting one mole of a divinyl compound having the formula: ##STR6## (4) with one mole of a compound having the formula (2) and with one mole of a compound having the formula (3), in the presence of an inorganic or organic palladium salt, or a mixture thereof, as catalyst-precursor.

Abstract: Catalysts for preparing ethylene by conversion of methane or purified natural gas and preparation thereof, and process for preparation of ethylene by direct conversion of methane or purified natural gas using said catalysts. The catalysts have the formula I as follows:Ma,Pc/S (I)wherein, M is a compound selected from the group consisting of RuCl.sub.2 (PPh.sub.3).sub.3, RuCl.sub.2 (CO).sub.2 (PPh.sub.3).sub.2, Ru.sub.3 (CO).sub.12, RhCl(CO)(PPh.sub.3).sub.2, IrCl(CO)PPh.sub.3).sub.3, Pd(PPh.sub.3).sub.4, Pt(PPh.sub.3).sub.4 and RuCl.sub.3.xH.sub.2 O, S is an inorganic carrier selected from the group consisting of .alpha.-Al.sub.2 O.sub.3, .gamma.-Al.sub.2 O.sub.3, SiO.sub.2, SiO.sub.2 -Al.sub.2 O.sub.3,Y-zeolite, MgO and TiO.sub.2, and P is a phosphorus compound promoter selected from the group consisting of PPh.sub.3, P(OCH.sub.3).sub.3, P(OC.sub.2 H.sub.5).sub.3, and P(O)(OC.sub.2 H.sub.5).sub.3 ; wherein a is the amount of metal in the catalyst, ranging from 0.

Abstract: Light olefins are produced from a hydrocarbon feedstock by a steam pyrolysis reaction in the presence of small quantities of essentially pure oxygen and selected catalytic solids to enhance the steam pyrolysis reaction, to promote the combustion of hydrogen to water and to minimize the formation of carbon oxides. The catalysts are characterized by low surface area, by non-alumina supports and by the catalytic oxides of the group IVB, VB and VIB transition metals.

Abstract: A process for selective catalytic cracking of a petroleum-based feedstock to produce a product having a high yield of liquified petroleum gas (LPG) and light olefins having 3 to 4 carbons includes providing a fluidized bed reactor which is a high velocity riser, continuously circulating fluidized bed reactor; providing a solid acidic catalyst comprised of: from 1 to 6% by wt. of ultra stable Y-zeolite; from 8-25% by wt. of Pentasil zeolite which is shape selective; from 0-8% by wt. of an active material which is bottom selective; from 0-1% by wt. of rare earth constituents; and from 91 to 60% by wt. of nonacidic constituents and binder; charging the fluidized bed reactor with the solid acidic catalyst and the petroleum-based feedstock; and cracking the petroleum-based feedstock in the presence of the solid acidic catalyst in the fluidized bed reactor. The reactor is operated at a Weight Hourly Space Velocity (WHSV) ranging from 40 to 120 hr.sup.

Abstract: The present invention provides a process for preparation of gasoline diesel and carbon black with waste rubber and waste plastics. The process comprises pyrolysis, purifying, catalytic cracking, and fractionation. The invention also relates to the catalyst used in the invention.

Abstract: A process for producing light olefins, especially ethylene, propylene, isobutylene and isoamylene, together with high octane gasoline as by-product, comprises that petroleum hydrocarbons are contacted with phosphorus and rare earth containing high silica zeolite having a structure of pentasil catalysts and catalytically converted at a temperature of 480.degree. to 680.degree. C. and a pressure of 1.2.times.10.sup.5 to 4.0.times.10.sup.5 Pa, with a contact time of 0.1 to 6 seconds, a weight ratio of catalyst to feedstock of 4:1 to 20:1 and a weight ratio of steam to feedstock of 0.01:1 to 0.5:1.

Abstract: The present invention relates to a new catalyst for converting methane into ethane, preparation thereof, and process for manufacturing ethylene using said catalyst. The conversion reaction catalyst in the present invention is employed in converting directly methane or methane-containing gas in the presence of the above catalyst with the following general formula (1).Ma.Pc.D/S (1)Where,M is a metal cluster or metal complex compound selected from the group of VIII, VII and VI series;S is an inorganic carrier;P is a promoter of phosphorus compound;D is a cobalt compound.And "a" is weight percentage of metal cluster or metal complex compound in catalyst, having a value of 0.01 to 10, "c" is weight percentage of promoter in catalyst, ranging from 1.0 to 35.0.

Abstract: An improved method of thermally cracking hydrocarbons to produce olefin wherein a gaseous stream containing hydrocarbons is passed through a heated metal tube in a pyrolysis furnace, the improvement comprising enhancing the olefin yield by exposing the gaseous stream to a barium silicate glass-ceramic as the gaseous stream passes through the tube.

Abstract: A novel process having improved flexibility in olefins production is provided which integrates a deep catalytic cracking process with a steam cracking process, and optionally, also including steps of disproportionation and C.sub.4 hydrocarbon processing including methyl tertiary butyl ether synthesis.

Abstract: Process for the preparation of a crystalline aluminosilicate enriched in silica, having the structure of mazzite, by hydrothermal crystallization of a gel containing sources of silicon, aluminum and alkali metal ions, in the presence of an organic structuring agent, characterized in that the source of aluminum is a zeolite Y in the form of spheres. The mazzite obtained does not contain any silicoalumina debris out of the lattice. It is employed as catalyst for the conversion of hydrocarbons or as molecular sieve.

Abstract: A process for the production of olefins in an olefin plant, which includes an olefin pyrolysis furnace having pyrolysis tubes in which hydrocarbon feedstock is cracked, comprises introducing hydrocarbon feed substantially free of phosphorous-containing compounds into the pyrolysis furnace and operating the furnace under pyrolysis conditions producing olefin-containing effluent therefrom wherein the pyrolysis tubes have an effective passivator of metal catalytic sites bonded to the exposed metal surface by injecting an effective passivator into the furnace at a point above the dew point of water.

Abstract: A staged process has been discovered for the selective conversion of paraffins in naphtha to aromatics and conversion of naphthenes in naphtha to olefins. In a first stage, n-paraffins in naphtha are converted to aromatics over modified non acidic zeolite catalyst particles with a low conversion of naphthenes in the feedstream. The effluent from the first stage is cascaded to a second stage reactor containing acidic zeolite catalyst wherein naphthenes are converted to light olefins. Advantageously, the process of the invention results in a reduction in the production of light C.sub.1 -C.sub.4 paraffins compared to the prior art. The preferred catalyst for the first stage is a platinum modified zeolite containing tin.

Abstract: A catalyst having the composition A:Al.sub.2 O.sub.3 is used as a catalyst for producing ethylene from methane. A is an alkali metal, preferably lithium. The catalyst may be doped with an additive such as MgCl.sub.2. A weak oxidation catalyst such as MoO.sub.3 or ZrO.sub.2 may be added. The catalyst is heated to at least 750.degree. C. in a catalytic reactor and a mixture of air and methane is passed over the heated catalyst. Oxygen or air may be added part way along the catalytic reaction to oxidize H.sub.2 but not C.sub.2 H.sub.4.

Abstract: A paraffin having 5 to 10 carbon atoms is catalytically cracked in the presence of a catalytically cracking catalyst having a strong acidity, especially a rare earth metal ion-exchanged mordenite or a dealuminized mordenite, to form a paraffin having 3 or 4 carbon atoms. The formed paraffin is contacted with a dehydrogenation catalyst to obtain an olefin having 3 or 4 carbon atoms.

Abstract: A process for the production of olefins and aromatics from hydrocarbon feedstocks by catalytically cracking alone or cracking and dehydrogenating the hydrocarbons in the presence of an entrained stream of catalytic heat carrying solids at short residence times to preferentially produce olefins having three or more carbon atoms and/or to produce aromatics, especially benzene.

Abstract: A modified natural clinoptilolite, produced by treating a natural clinoptilolite with a suitable mineral acid or with a suitable alkali and then with a suitable mineral acid, is used as a catalyst in a process for the conversion of propane or butane to give a product containing at least 40% of ethene, propene or C.sub.4 hydrocarbons or a mixture thereof.

Abstract: This invention is a process for the catalytic cracking of parafins to produce olefins in high yield while minimizing production of aromatics. The catalyst used is a zeolite in combination with an alkali(ne earth) metal compound wherein the sum of the amount of the alkali(ne earth) metal in the compound plus any metal cation exchanged into the zeolite is in excess of that required to provide a fully metal cation-exchanged zeolite.

Abstract: Disclosed is a method for cracking a hydrocarbon material. The method includes introducing a stream including a hydrocarbon fluid and a carrier fluid into a reaction zone. A microwave discharge plasma is continuously maintained within the reaction zone, and in the presence of the hydrocarbon fluid and the carrier fluid. Reaction products of the microwave discharge are collected downstream of the reaction zone.

Abstract: Compositions of matter particularly useful for the oxidative conversion of feed organic compounds to produce organic compounds include combination of Group IIA, zinc, titanium and Lanthanum Series base materials and, optionally, Group IA and/or halogen promoters. A method for the oxidative conversion of feed organic compounds to produce organic compounds, particularly methane, to higher hydrocarbons and saturated C.sub.2 to C.sub.7 hydrocarbons to less saturated hydrocarbons in the presence of an oxygen-containing gas is disclosed utilizing base compositions of matter.

Abstract: This invention relates to processes for making biodegradable surfactant. The process comprises several steps including an optional step. The first step is directed to reacting olefins with ZSM-23 catalyst to form oligomers having the formula (C.sub.3).sub.x, (C.sub.4).sub.x or mixtures thereof. Second, the oligomer is hydroformylated to form a saturated alcohol, for example, tridecanol. Next, the saturated alcohol is ethoxylated. Thereafter a nonionic biodegradable surfactant is recovered. This surfactant can be used in detergent formulations. A process is also taught for making esters which can be used as lubricants or plasticizers. A specific hydroformylation process is taught which utilizes modified cobalt carbonyl catalyst. Also, a specific ethoxylation process is taught. Products formed according to the latter two processes as well as their uses are also taught.

Abstract: The invention relates to hydrocarbon conversion to lower olefins by reaction over a catalyst which is a zeolite having protonated sites external to the pores and exchangeable cation sites within the pores.

Abstract: Process for the production of a mono-olefin from a gaseous paraffinic hydrocarbon having at least two carbon atoms or a mixture thereof. The process includes the step of partially combusting, in contact with a combustion catalyst, the gaseous paraffinic hydrocarbon or a mixture of the gaseous paraffinic hydrocarbons and a molecular oxygen-containing gas in a composition of from 5 to 9 times the stoichiometric ratio of hydrocarbon to oxygen for complete combustion of carbon dioxide and water. In the process, the mixture is partially combusted at a temperature in the range of 500.degree. to 1200.degree. C. and at a gas hourly space velocity of at least 80,000 hr.sup.-1.

Abstract: The C.sub.2 -C.sub.4 olefin yield is unexpectedly increased while coke and heavy aromatics production are decreased by the addition of a propane-rich supplemental feedstream in a process for catalytically upgrading C.sub.5 -C.sub.7 paraffinic feedstreams. Further benefits include increased conversion of the C.sub.5 -C.sub.7 paraffinic feedstream, decreased coke production and prolonged catalyst useful life. Udex raffinate is a particularly preferred feedstream.