摘要:
A method and system for providing heat to a chemical conversion process is advantageously employed in the production of olefin by the catalytic dehydrogenation of a corresponding hydrocarbon. The catalytic dehydrogenation process employs diluent steam operating at a steam to oil ratio which can be 1.0 or below and relatively low steam superheater furnace temperature. The process and system are advantageously employed for the production of styrene by the catalytic dehydrogenation of ethylbenzene.
摘要:
The invention relates to [bis(trihydrocarbylsilyl)aminosilyl]-functionalized styrene and a method for its preparation. The invention further relates to the use of the styrene derivative in the preparation of a copolymer thereof.
摘要:
The present invention provides a heteroatom-containing nano-carbon material, a preparation process and use thereof, based on the total weight of said heteroatom-containing nano-carbon material and calculated as the elements, the oxygen content is 1-6wt%, the nitrogen content is 0-2wt%, the carbon content is 92-99wt%; in the XPS, the ratio of the oxygen content as determined with the peak(s) in the range of 531.0-532.5eV to the oxygen content as determined with the peak(s) in the range of 532.6-533.5eV is 0.2-0.8; the ratio of the carbon content as determined with the peak(s) in the range of 288.6-288.8eV to the carbon content as determined with the peak(s) in the range of 286.0-286.2eV is 0.2-1; the ratio of the nitrogen content as determined with the peak(s) in the range of 398.5-400.1eV to the total nitrogen content is 0.7-1. Said heteroatom-containing nano-carbon material shows a good catalytic capability in dehydrogenation of hydrocarbons, and can notably increase the conversion of the starting material and the selectivity for the target product
摘要:
In various embodiments, the present disclosure describes processes and systems for recovery of styrene from a styrene-rich feedstock. The processes and systems maintain performance of an extractive solvent used in the styrene recovery. In general, the processes include introducing a styrene-rich feedstock to an extractive distillation column, removing a styrene-rich stream from the extractive distillation column, introducing the styrene-rich stream to a solvent recovery column, removing a styrene-lean stream from the solvent recovery column, separating and treating a portion of the styrene-lean stream to form a treated extractive solvent and recycling the treated extractive solvent. In some embodiments, the treating process also includes steam stripping. Styrene-recovery systems including an extractive distillation column, a solvent recovery column, a solvent treatment apparatus having at least one equilibrium stage and a continuous circulation loop connecting these components are also disclosed herein.
摘要:
Improved Amine Based Additive Composition for Control and Inhibition of Polymerization of Aromatic Vinyl Monomers, and Method of Use thereof. The present invention relates to an improved amine based additive composition for control and inhibition of polymerization of aromatic vinyl monomers including styrene comprising one or more of the quinone methide or derivatives thereof, one or more of nitroxide compounds and further comprising one or more of aliphatic tertiary amines. In one embodiment, the present invention also relates to method of use of presently provided composition. In another embodiment, the present invention also relates to method of controlling and inhibiting polymerization of aromatic vinyl monomers, particularly of styrene by employing presently provided composition. In still another embodiment, the present invention also relates to method of preparation of presently provided composition.
摘要:
The invention relates to a method for preparing a selective hydrogenation catalyst, the active phase of which includes at least one Group VIII metal, and at least one substrate consisting of at least one oxide, wherein said method includes: a) at least a step of preparing a solution containing at least one precursor of said Group VIII metal and at least one additive, said precursor and said additive being added during the preparation of the solution with an additive/Group VIII metal molar ratio of less than or equal to 1.5; b) at least a step of impregnating said substrate with the solution prepared in step a); c) at least a step of drying the impregnated substrate from step b); and d) at least a step of calcining the dried substrate from step c) so as to obtain at least said Group VIII metal in an oxide form. The invention also relates to a hydrogenation method implementing said catalyst. The additives are organic compounds having one to three carboxylic acid functions, preferably carboxylic acids selected from among glycine, aspartic acid, citric acid, and tartric acid. The catalyst obtained by this specific preparation method has catalytic performance that is enhanced in terms of selectivity while still having high activity.
摘要:
A method to make a phosphorus modified zeolite can include providing a zeolite including at least one ten member ring in the structure steaming the zeolite, mixing the zeolite with one or more binders and shaping additives, and then shaping the mixture. The method can include making a ion-exchange. The shaped mixture can be steamed. Phosphorous can be introduced on the catalyst to introduce at least 0.1 wt % of phosphorus, such as be dry impregnation or chemical vapor deposition. A metal, such as calcium, can be introduced. The catalyst can be washed, calcinated, and then steamed. The steaming severity (X) can be at least about 2. The catalyst can be steamed at a temperature above 625° C., such as a temperature ranging from 700 to 800° C. The catalyst can be used in alcohol dehydration, olefin cracking, MTO processes, and alkylation of aromatics by alcohols with olefins and/or alcohols.