47 results about "Hydrodealkylation" patented technology

A reforming process includes an endpoint reduction zone for converting C11+ components via selective hydrogenation and hydrodealkylation to lower boiling point aromatics, such as benzene, toluene, and xylene, or their single ring aromatic C9-C10 precursors.

Fisclosed are a process for producing aromatic hydrocarbon compounds and liquefied petroleum gas (LPG) from a hydrocarbon feedstock having boiling points of 30-250 DEG C and a catalyst useful therefor. In the presence of said catalyst, aromatic components in the hydrocarbon feedstock are converted to BTX-enriched components of liquid phase through hydrodealkylation and / or transalkylation, and non-aromatic components are converted to LPG-enriched gaseous materials through hydrocracking. The products of liquid phase may be separated as benzene, toluene, xylene, and C9 or higher aromatic compounds, respectively according to their different boiling points, while LPG is separated from the gaseous products, in a distillation tower.

Methods are provided for the treatment of a feed stream containing C9 aromatic components to produce mesitylene-containing products. The methods include hydrodealkylating the feed stream to remove C2 and higher alkyl groups from the aromatic components and transalkylating the feed stream to rearrange the distribution of methyl groups among the aromatic components. Disclosed methods also include the treatment of a hydrocarbon feedstock by hydrodealkylation and / or transalkylation in order to produce a hydrocarbon product having an increased mass percentage of mesitylene.

A process for treatment of PFO from a steam cracking zone includes hydrodealkylating PFO or a portion thereof for conversion of polyaromatics compounds contained in the PFO into hydrodealkylated aromatic compounds with one benzene ring, a hydrodealkylated BTX+ stream. In addition, a naphtha reformer is integrated, so that the hydrodealkylated BTX+ stream and a reformate stream are separated into BTX compounds.

The invention discloses a preparation method of a nanometer stepped hole mordenite molecular sieve. The method comprises the following steps: dissolving sodium hydroxide in water and then adding a silicon source at room temperature to stir for 0.5-1.5 h to obtain alkaline silicon source solution; adding an aluminum source dissolved by using the water into the alkaline silicon source solution, stirring for 1 h at the room temperature to form uniform silicon and aluminum mixed solution, adding a mesoporous soft template (R) for 1 h, then adding a seed crystal (M) and stirring for 1 h to form a gel mixture, and then dynamically crystallizing at 100-180 DEG C for 12-96 h; cooling, performing extraction filtration and washing the product after crystallization until pH is about 7, drying at 100 DEG C for 12 h, roasting at the constant temperature of 110 DEG C for 3 h and then rising temperature to 500 DEG C to roast for 3 h to obtain a nanometer stepped hole mordenite product. The mordenite molecular sieve prepared by the invention has the typical nanometer stepped hole characteristic, and the hydrodealkylation performance of the Pt / MOR catalyst loaded with the sieve as a carrier is obviously improved.

The invention discloses a process for producing arene through continuous reforming. The process comprises the following steps: pre-hydrogenation treatment is performed on a naphtha raw material, catalytic reforming is performed on the oil generated through pre-hydrogenation treatment so that at least a part of paraffin and a part of cycloparaffin are converted to arene, selective hydrodealkylation is performed on the oil generated through catalytic reforming, the oil generated through selective hydrogenation is separated to obtain arene; a part of the gas with rich hydrogen, generated by catalytic reforming device is circulated to the catalytic reforming device and the residual gas is pressurized to perform selective hydrogenation reaction with the oil generated through catalytic reforming to remove the olefin in the oil, wherein the selective hydrogenation of the oil generated through catalytic reforming adopts hydrogen single-pass flow, the effluent of the selective hydrogenation reaction is separated to gaseous phase and liquid phase; a part of gaseous phase is used as the hydrogen make-up of the naphtha raw material pre-hydrogenation device, the rest part is discharged out of the device; and the liquid phase is used for the separation of the arene product. Compared with the prior art, the method disclosed by the invention has the advantages that the raw material adaptability is high, the byproduct discharged to the outside has high hydrogen content and the economy of the catalytic reforming device is high and the like.

The present disclosure relates to a process for the hydrodealkylation of aromatic rich hydrocarbon streams to produce benzene, toluene and mixed xylenes (BTX), with high selectivity towards high value xylenes. The process uses catalysts containing a framework-substituted zirconium and / or titanium and / or hafnium-modified ultra-stable Y (USY) type zeolite.