Abstract: Systems and methods for processing a C4 and C5 stream are disclosed. A pygas stream can be separated in a depentanizer to produce a C4 and C5 stream and a C6 to C9+ stream. The C4 and C5 stream is further processed to recover C5 dienes including isoprene, pentadiene, cyclopentadiene, or combinations thereof. The C6 to C9+ stream is further processed to recover aromatics including benzene, toluene, xylene, ethylbenzene, or combinations thereof.

Abstract: Disclosed is a process for the conversion of acyclic C5 feedstock to a product comprising cyclic C5 compounds, such as for example, cyclopentadiene, and catalyst compositions for use in such process. The process comprising the steps of contacting said feedstock and, optionally, hydrogen under acyclic C5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprises a Group 10 metal, and, optionally, a Group 11 metal, on a catalyst support with a Group 1 alkali metal silicate and/or a Group 2 alkaline earth metal silicate.

Abstract: A method for producing an olefin and a monocyclic aromatic hydrocarbon of the present invention includes a dicyclopentadiene removal treatment step of removing dicyclopentadienes having a dicyclopentadiene skeleton from a feedstock oil which is a thermally-cracked heavy oil obtained from an apparatus for producing ethylene and which has a 90 volume % distillate temperature, as a distillation characteristic, of 390° C. or lower; and a cracking and reforming reaction step of obtaining a product containing an olefin and a monocyclic aromatic hydrocarbon by bringing the feedstock oil having a content of dicyclopentadienes adjusted to 10% by weight or less by treating a part or all of the feedstock oil through the dicyclopentadiene removal step into contact with a catalyst and reacting the feedstock oil.

Abstract: Embodiments of the present invention are directed generally to methods for producing high purity exo-alkenylnorbornenes from a mixture of conformational isomers thereof.

Abstract: The present invention relates to a synthesis method of metal cyclopentadienide by direct reaction of dicyclopentadiene with a group 1 metal in the presence of an aprotic solvent. Unlike the conventional method depending on retro Diels-Alder reaction of dicyclopentadiene to generate indirectly cyclopentadiene, the method of the present invention favors generation of cyclopentadiene and metal cyclopentadienide as well by adding dicyclopentadiene directly when the reaction temperature reaches to the boiling point of a reaction solvent.

Abstract: This invention provides a process for forming monomers from a dimer, wherein the dimer is dicyclopentadiene, di(methylcyclopentadiene), di(ethyleyclopentadiene), or a mixture of any two or more of these. The process comprises i) heating a liquid mixture comprising at least one dimer and at least one liquefying agent in a vaporization zone to at least the vaporization temperature of said mixture to form a vaporized mixture, wherein the vaporization zone consists essentially of a substantially straight conduit in which said liquid mixture occupies less than the entire cross sectional area of said conduit; and ii) introducing at least a portion of the vaporized mixture from i) into a cracking zone such that monomers are formed. This process is conducted at about atmospheric pressure.

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: A method for thermally cracking Diels-Alder adducts and for altering organic streams containing Diels-Alder adducts using controlled cavitation conditions.

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: The present invention provides a process for producing cyclopentadiene or a derivative thereof by heating a mixture containing at least one of dicyclopentadiene or a derivative thereof, the process comprising: a first step comprising heating the mixture into vapor; a second step comprising maintaining while heating the vapor at a temperature higher than the boiling point of the desired cyclopentadiene or derivative thereof to condense and remove high-boiling components and simultaneously collect residual vapor; and a third step comprising maintaining while heating the collected vapor at a temperature lower than the boiling point of the desired cyclopentadiene or derivative thereof to condense and collect the cyclopentadiene or derivative thereof. In the third step, the vapor may be contact with nitrogen gas to improve the yield of the cyclopentadiene or derivative thereof.

Abstract: This process for the manufacture of norbornene from dicyclopentadiene (DCPD) and ethylene is characterized in that the DCPD is subjected to partial monomerization to CPD by preheating: at a temperature of 140° C. to 240° C.; and under a pressure of 20 to 300 bar abs., before reacting it with the ethylene; with an ethylene/DCPD molar ratio of 1 to 20; at a temperature of 200° C. to 320° C.; under a pressure of 20 to 300 bar abs.; and with a residence time of 1 to 10 minutes, under stable reaction conditions between the DCPD, the CPD and the ethylene.

Abstract: The present invention provides a process for producing cyclopentadiene or a derivative thereof by heating a mixture containing at least one of dicyclopentadiene or a derivative thereof, the process comprising: a first step comprising heating the mixture into vapor; a second step comprising maintaining while heating the vapor at a temperature higher than the boiling point of the desired cyclopentadiene or derivative thereof to condense and remove high-boiling components and simultaneously collect residual vapor; and a third step comprising maintaining while heating the collected vapor at a temperature lower than the boiling point of the desired cyclopentadiene or derivative thereof to condense and collect the cyclopentadiene or derivative thereof. In the third step, the vapor may be contact with nitrogen gas to improve the yield of the cyclopentadiene or derivative thereof.

Abstract: Disclosed is a method for the preparation of norbornene and substituted norbornene compounds via a Diels-Alder reaction, in which a cyclic diene is reacted with an olefinic compound in order to prepare a norbornene compound. According to the invention a cyclic diene is gradually added to react with an olefinic compound, in order to keep the concentration of the cyclic diene in the reaction mixture as low as possible during the reaction. It is possible to obtain a very pure product, high yield, short reaction time and high concentrations of the exo diastereomer with the method of the invention.

Abstract: A number of process steps are provided that can be combined to produce bridged cyclopentadienyl-fluorenyl metallocenes. The process steps include production of a cyclopentadiene compound from dicyclopentadiene; production and recovery of a fulvene compound using the cyclopentadiene compound; production of a raw metallocene product using the fulvene compound; and recovery of the pure metallocene from the raw product.

Abstract: A process is disclosed for converting dicyclopentadiene to cyclopentane and/or cyclopentene, wherein dicyclopentadiene is fed to a catalytic distillation column, the dicyclopentadiene is cracked to cyclopentadiene in the catalytic distillation column, the cyclopentadiene is hydrogenated to cyclopentane in the catalytic distillation column, and the cyclopentane is recovered from the catalytic distillation column. The dicyclopentadiene is fed into and cracked to cyclopentadiene at the bottom of the catalytic distillation column. Hydrogen is then fed to the catalytic distillation column below the catalytic zone, where cyclopentadiene is hydrogenated as it is produced, thus suppressing polymerization of the cyclopentadiene. The resulting cyclopentane and/or cyclopentene vapor phase stream is condensed, thereby producing a liquid stream of cyclopentane and/or cyclopentene and a vapor stream of hydrogen and other off-gas by-products.

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 process and a system for cracking dicyclopentadiene are disclosed pursuant to the process preheated dicyclopentadiene is introduced into a heated transfer fluid sufficiently below the transfer fluid surface to accomplish substantially complete conversion of said dicyclopentadiene to monomeric cyclopentadiene vapor.

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: Recently, as a process for manufacturing cyclopentadiene resin-shaped articles, an attention has been given to reaction injection molding (RIM). To conduct RIM, it is necessary to use high purity dicyclopentadiene (DCPD) as the raw material. Vapor-phase thermal cracking of DCPD is usually used as a step of process for manufacturing high purity DCPD. Hithertofore, when conducting thermal cracking of DCPD, coke formation within cracking tubes is the most serious and troublesome problem. A vapor-phase thermal cracking process for resolving the problem by a very simple procedure is described herein. Further, a process for manufacturing high purity DCPD suitable as a raw material for use in RIM utilizing the vapor-phase thermal cracking process just mentioned above is also described.

Abstract: The process gives highly pure cyclopentadiene and methylcyclopentadiene from a cracked gasoline fraction. The merit of the process is that cyclopentadiene and methylcyclopentadiene are recovered by adding a simple distillation system to a conventional cracked gasoline treating plant without altering the plant and operating conditions thereof. An internal reflux stream is withdrawn from the stripping section of a BTX column of a conventional cracked gasoline treating plant, and is sent to a depolymerization-distillation column operated at a bottom temperature of 160.degree.-230.degree. C. The overhead stream of the column is sent to a cyclopentadiene column operated at a bottom temperature of 160.degree.-230.degree. C. Cyclopentadiene is recovered from the overhead of the column, and the bottom stream is sent to methylcyclopentadiene column operated at a bottom temperature of 170.degree.-210.degree. C. Methylcyclopentadiene is recovered from the overhead of the column.