Abstract: This invention provides a method of preparing an isomerization catalyst by contacting an alkali metal with catalyst support particles in a fluidized bed. After the alkali metal is uniformly dispersed on the support particles, oxygen is added to the fluidizing gas to oxidize a portion of the alkali metal.

Abstract: This invention provides a method of preparing an isomerization catalyst by contacting an alkali metal with catalyst support particles in a fluidized bed. After the alkali metal is uniformly dispersed on the support particles, oxygen is added to the fluidizing gas to oxidize a portion of the alkali metal.

Abstract: The present invention relates to a method for using a single distillation column to recover the reactants and products from the reaction of a cyclic diolefin and an olefin to produce an alkenyl bridged ring compound.

Abstract: A method for enhancing ethylene yield in the conversion of oxygenates to olefins that involves extracting molecular sieve catalysts, such as silicoaluminophosphate catalysts, with a mineral acid is provided. Acid extraction is thought to alter the crystallinity of the molecular sieve catalyst and thereby improve ethylene yield.

Abstract: A method of removing contaminants from a hydrocarbon stream which involves contacting the hydrocarbon stream containing a heavy-metal contaminant with a porous material under conditions suitable for adsorption of the contaminant by the porous material. A process for preparing an adsorbent which involves forming a mixture of metal oxide powder and support powder, shaping the mixture into an aggregate, and reducing the aggregate to transform the metal oxide to the metallic state.

Abstract: A method for acetylene hydrogenation which involves adding a member selected from the group consisting of arsine and phosphine to moderate the activity of acetylene hydrogenation catalysts while maintaining acceptable catalyst activity and avoiding the risk of product quality contamination by the acetylene converter moderator. The acetylene hydrogenation process involves adding arsine at a concentration level within the range of about 1 wppb-3 wppb to the gas, such as ethylene, containing acetylene to prevent temperature runaway during the exothermic acetylene hydrogenation reaction. By controlling the presence of arsine levels to such a relatively low level, temperature runaway during the highly exothermic acetylene hydrogenation reaction is prevented while maintaining acceptable catalyst activity levels for purposes of the acetylene hydrogenation reaction.

Abstract: A process for the production of gaseous olefins which involves introducing a hydrocarbon feedstock stream into a high temperature thermal cracking zone to produce a high temperature cracked product stream, quenching the cracked product stream to stop the cracking reactions, injecting at least one HDD (hydrogen donor diluent) into the cracked product stream at or downstream of the point at which the reaction is quenched, recovering normally gaseous olefins from the cracked product stream, and recovering a liquid product stream containing a diminished asphaltene content.

Abstract: A safe, effective, and economical method is provided for recovering olefins from cat-cracked gases without accumulating dangerous amounts of nitrogen oxides. A stream of cat-cracked gas first is scrubbed to remove acid gases, including nitrogen dioxide (NO.sub.2), and then is passed through a depropanizer fractionation tower. Hydrocarbons having four or more carbon atoms are recovered in the bottoms of the depropanizer, and the overhead from the depropanizer--which is composed of hydrocarbons having three or fewer carbon atoms--is sent to an absorber demethanizer tower. Hydrocarbons having two or more carbon atoms are recovered in the bottoms from the absorber demethanizer tower, where temperatures are no lower than about -45.56.degree. C. (-50.degree. F.). The overhead from the absorber demethanizer tower--which is composed of methane, hydrogen, and trace amounts of nitrogen oxide, C.sub.2, and absorbent (C.sub.3)--then is chilled to condense and recover trace amounts of C.sub.

Abstract: The present invention is directed to adsorbing polymeric hydrocarbons (ie. polymers of iso-butylene, polymers of the isomers of iso-butylene (poly-butenes) and co-polymers of iso-butylene and other olefins (butyl rubber) from hydrocarbon or raffinate streams using activated carbon as the adsorbent. One embodiment includes the selective removal of poly-isobutylene (PIB) from a hydrocarbon stream by activated carbon. The stream which can exceed 100 ppm PIB is contacted with the activated carbon for a sufficient time to reduce the PIB content of the hydrocarbon stream to less than about 1 ppm.

Abstract: Inhibition of popcorn polymer growth by treatment with a sulfur-containing compound. The sulfur-containing compound can be added to organic material from which popcorn polymer is formed, or applied to extant popcorn polymer.

Abstract: A process flow sequence for the reduction of polymer fouling while maintaining efficient production levels wherein a dual pressure, dual column configuration is used to effect the reduction in polymer fouling. The dual pressure, dual column configuration of the invention uses a high pressure and a separate low pressure to isolate the desired fractions while effecting a reduction in the production of fouling polymers.

Abstract: An improved method for regenerating acetylene hydrogenation catalysts which does not require an oxygenation step is provided. The method may be used to regenerate any acetylene hydrogenation catalyst; however, the method is particularly advantageous when used with a palladium based catalyst which has been used to remove acetylenic contaminants from ethylene.

Abstract: The present invention is directed to a process for removing impurities from hydrocarbon streams, preferably light ends, such as propylene and ethylene, which is preferably in the liquid phase, by contacting the hydrocarbon stream containing an initial amount of an impurity with a chemical adsorbent which is composed of a modified alumina having a surface area within the range of about 10 m.sup.2 /g to about 300 m.sup.2 /g and a pore volume within the range of about 0.1 mL/g to about 1 mL/g under contacting conditions effective to result in a purified hydrocarbon stream containing a reduced amount of impurities, i.e., less than about 0.5% relative to the initial amount of the acid impurity present in the hydrocarbon stream, and more preferably within the 10 ppb range.

Abstract: A multi-stage process for isomerizing olefin compounds to the corresponding product olefin compounds is provided. The isomerization catalyst comprises an oxygen treated mixture of an alkali metal on a calcined support. The multi-stage process is particularly useful for isomerizing 5-vinyl-2-norbornene to 5-ethylidiene-2-norbornene. The catalyst is very active and highly selective and resistent to catalyst poisons. The process contacts the catalyst with an isomerizable olefin in at least two reaction stages to yield the corresponding product olefin compound. The reaction stages differ in temperature, catalyst activity or both.

Abstract: A process for converting an oxygenate feed to light olefins using a microporous zeolite catalysts such as ECR-1, mazmorites, and/or ECR-18 is provided. In a preferred embodiment, the process is conducted at approximately 440.degree. C. (824.degree. F.) to about 460.degree. C. (860.degree. F.) using a methanol:water (approximately 1:4 molar ratio) feed and results in superior production of light olefins.

Abstract: The present invention provides a process for cracking or decomposing a feedstream containing a major proportion of at least one dialkyl ether to produce the corresponding olefins comprising contacting the feedstream with a faujasite aluminosilicate catalyst which is characterized in that at least about 50 wt. % of the alkali metal content originally present in said faujasite has been exchanged by at least one alkaline earth metal. The decomposition is preferably conducted in the vapor phase at preferred temperatures in the range of from about 125.degree. F. to about 600.degree. F. The process offers the advantages of longer catalyst life coupled with high yield and selectivity rates towards olefin production.

Abstract: A process for regenerating a catalyst which involves washing a catalyst with a liquid at a temperature within the range of about 50.degree. C. to about 70.degree. C. for a time sufficient to remove foulants thereby recovering catalyst activity. The wash liquid is preferably a member selected from the group consisting of ethers, alcohols and mixtures of ethers and alcohols wherein the ether is a tertiary alkyl ether, preferably selected from the group consisting of tertiary amyl methyl ether and methyl tertiary butyl ether, and wherein the alcohol is preferably selected from the group consisting of tertiary butyl alcohol and methanol. The catalyst is preferably a clay treated with an acid selected from the group consisting of hydrofluoric acid, hydrochloric acid and mixtures of hydrofluoric and hydrochloric acid, wherein the clay is preferably selected from the group consisting of montmorillonite, kaolinite, attapulgite, bentoninte and natural clay.

Abstract: A process for purifying linear paraffins in which a hydrocarbon stream containing linear paraffins contaminated with aromatics, sulfur-, nitrogen-, and oxygen-containing compounds, and color bodies, but essentially free of olefins, is contacted with a zeolitic solid adsorbent such as a NaX zeolite or zeolite MgY. After adsorption the zeolitic solid adsorbent is desorbed with an alkyl-substituted aromatic desorbent such as toluene.

Abstract: A process for the production of gaseous olefins which involves introducing a hydrocarbon feedstock stream into a high temperature thermal cracking zone to produce a high temperature cracked product stream, quenching the cracked product stream to stop the cracking reactions, injecting at least one HDD (hydrogen donor diluent) into the cracked product stream at or downstream of the point at which the reaction is quenched, recovering normally gaseous olefins from the cracked product stream, and recovering a liquid product stream containing a diminished asphaltene content.

Abstract: A two-step extraction method for the separation of vinyl acetate from a liquid mixture containing oxygenated compounds, paraffins and olefins, vinyl acetate, water, heavy oils, and other impurities, such as an anti-oxidant, is provided. The first step of the process extracts vinyl acetate and oxygenated compounds from the liquid mixture with a water wash. The paraffins, olefins, and heavy oils are insoluble in the water wash and are recovered as a waste stream from the wash. In a second step the vinyl acetate-rich water is distilled in a steam stripper column. Water is collected as the bottoms from the column and the overhead vapors are cooled by a condenser and collected in a separator tank. The separator tank liquids separate into an aqueous phase and a vinyl acetate phase. The aqueous phase is a waste stream. The vinyl acetate phase is recovered and may be used as a feedstock for polymerization or copolymerization reactions.