Abstract:
Methods are provided for producing normal paraffins. A method includes contacting a feedstock with a deoxygenation catalyst to produce a paraffin stream, where the feedstock includes a natural oil, and where the deoxygenation catalyst is sulfided. The reactions conditions are controlled when the feedstock contacts the deoxygenation catalyst to control a C11 to C12 normal paraffin ratio, by weight to within about 0.4 to about 1.7.
Abstract:
A process for pyrolyzing a coal feed is described. A coal feed is pyrolyzed into a coal tar stream and a coke stream in a pyrolysis zone. The coal tar stream is separated into at least a pitch stream comprising aromatic hydrocarbons. The pitch stream is reacted in a reaction zone to add at least one functional group to an aromatic ring of the aromatic hydrocarbons in the pitch stream. The functionalized pitch stream is recycled to the pyrolysis zone.
Abstract:
A process for pyrolyzing a coal feed is described. A coal feed is pyrolyzed into a coal tar stream and a coke stream in a pyrolysis zone. The coal tar stream is separated into at least a pitch stream comprising aromatic hydrocarbons. The pitch stream is reacted in a reaction zone to add at least one functional group to an aromatic ring of the aromatic hydrocarbons in the pitch stream. The functionalized pitch stream is recycled to the pyrolysis zone.
Abstract:
The production of linear alkylbenzene from a natural oil is provided. A method comprises the step of deoxygenating the natural oils to form a stream comprising paraffins. The paraffins are dehydrogenated to provide mono-olefins. Then, benzene is alkylated with the mono-olefins under alkylation conditions to provide an alkylation effluent comprising alkylbenzenes and benzene. Thereafter, the alkylbenzenes are isolated to provide the alkylbenzene product.
Abstract:
A method for producing xylene from feedstock oil includes a cracking/reforming reaction step of bringing the feedstock oil into contact with a catalyst to produce monocyclic aromatic hydrocarbons; a separation/recovery step of separating and recovering, from a product obtained by the cracking/reforming reaction step, a fraction A containing monocyclic aromatic hydrocarbons having a 10 vol % distillation temperature of 75° C. or higher and a 90 vol % distillation temperature of 140° C. or lower, a xylene fraction containing xylene, and a fraction B containing monocyclic aromatic hydrocarbons having a 10 vol % distillation temperature of 145° C. or higher and a 90 vol % distillation temperature of 215° C. or lower; and a xylene conversion step of bringing a mixed fraction obtained by mixing the fractions A and B with each other into contact with a catalyst containing a solid acid to convert the mixed fraction into xylene.
Abstract:
Disclosed is an alkylation reactor for preparing ethylbenzene. The reactor comprises a monolith catalyst system that includes a monolith support impregnated or co-formed with a catalyst suitable to catalyze the alkylation of benzene with ethylene. The catalyst may be selected from, for example, zeolites such as beta zeolite and MCM-22 zeolite, and fixed super acids. Also disclosed is a method of preparing ethylbenzene by alkylating a mixture of benzene and ethylene in an alkylation reactor comprising a monolith catalyst system, including a monolith support impregnated or co-formed with a suitable catalyst. In one embodiment the invention provides a convenient means of upgrading an existing reactor that has previously been used for conventional liquid phase alkylations such as those catalyzed by aluminum trichloride. The inventive alkylation method may be effectively and advantageously carried out under critical or near critical conditions, if desired.
Abstract:
A process for alkylating an aromatic compound comprising reacting at least one aromatic compound with a mixture of olefins selected from olefins having from about 8 to about 100 carbon atoms, in the presence of an acidic ionic liquid catalyst, wherein the resulting product comprises at least about 50 weight percent of a 1, 2, 4 tri-substituted aromatic compound or a 1, 2, 3 tri-substituted aromatic compound or mixtures thereof.
Abstract:
The present invention discloses a process for alkylation of an aromatic hydrocarbon or isoalkane with an olefin over the catalysis of a solid acid, comprising contacting a reaction material containing an aromatic hydrocarbon or C4-C6 isoalkane, C2-C18 monoolefin and a compound containing a strongly electronegative element as promoter with a solid acid catalyst to carry out the alkylation, characterized in that the solid acid catalyst is contacted with a compound having a strongly electronegative element prior to its contact with the reaction material. Said process not only greatly increases the selectivity of the target product of the alkylation but also improves stability of the solid acid catalyst.
Abstract:
Methods for the preparation of fluorenyl-type ligand structures and substituted fluorenyl groups which may be employed in metallocene-type olefin polymerization catalysts. There is provided a 2,2′-dihalogen-diphenylmethylene having a methylene bridge connecting a pair of phenyl groups. Each phenyl group has a halogen on a proximal carbon atom relative to the methylene bridge. The halogenated diphenylmethylene is reacted with a coupling agent comprising a Group 2 or 12 transition metal in the presence of a nickel or palladium-based catalyst to remove the halogen atoms from the phenyl groups and couple the phenyl groups at the proximal carbon atoms to produce a fluorene ligand structure. The coupling agent may be zinc, cadmium or magnesium and the catalyst may be a monophosphene nickel complex. The halogenated diphenylmethylene may be an unsubstituted ligand structure or a monosubstituted or disubstituted ligand structure. The halogenated diphenylmethylene may be monosubstituted with a tertiary butyl group or may be a dialkyl diphenylmethylene having alkyl substituents at the directly distal positions of the phenyl groups relative to the methylene bridge.
Abstract:
Improved integrated processes for the production of alkyl aromatic compounds are disclosed wherein aromatic compounds which may be treated for removal of deleterious substances are reacted with olefin compounds, which may also be treated for contaminant removal, in the presence of acidic zeolite catalyst(s) to produce the desired alkyl aromatic compound(s). The aromatic and preferably also the olefin feeds are treated substantially to remove contaminants, particularly the nitrogen compounds contained therein, before they are brought together for reaction in the presence of the zeolite catalyst(s). In accordance with the present invention, it has been found that feed pretreatment for removal of nitrogen compounds significantly improves the run length and life of the acidic zeolite catalyst(s). The feed pretreatment of this invention may include the steps of distillation, extraction, and/or adsorption by solid adsorbent, which may be regenerated in accordance with further embodiments of this invention.