47 results about "Hydrodealkylation" patented technology

The invention relates to a heavy aromatic hydrocarbon light catalyst, a preparation method and application thereof. In a composite carrier, H type MCM-56 zeolite is between 50 and 80 wt percent, Al2O3 is between 20 and 50 wt percent, metals or oxides thereof of tin, bismuth, lanthanum, molybdenum, nickel, chrome and cobalt are 3 to 20 wt percent, or platinum, palladium, rhenium or oxide thereof are 0.1 to 2wt percent. The catalyst is applicable to the light preparation of benzene, methylbenzene and dimethylbenzene by heavy aromatic hydrocarbon; and the catalyst has good catalytic effect on a hydrodealkylation light reaction of C9 heavy aromatic hydrocarbon, the transformation ratio of C9 aromatic hydrocarbon is 76.89 wt percent, the yield of BTX is 48.37 wt percent, the selectivity of the BTX is 80.50 mol percent, no phenylethane is generated in a product, and the dimethylbenzene has high content.

A method of forming mixed xylenes from a heavy reformate using a dealkylation-transalkylation system includes the step of introducing both a heavy reformate containing methyl ethyl benzenes and tri-methyl benzenes and that is sufficiently free of toluene and a hydrogen-containing material into the dealkylation stage such that the heavy reformate and the hydrogen-containing material intermingle and contact the hydrodealkylation catalyst. The dealkylation-transalkylation system includes dealkylation, non-aromatic product gas separations and transalkylation stages. Toluene forms from the reaction of methyl ethyl benzenes and hydrogen in the presence of the hydrodealkylation catalyst. The method also includes the step of introducing a dealkylated heavy reformate into the transalkylation stage such that the dealkylated heavy reformate contacts a transalkylation catalyst, forming a transalkylation stage product mixture includes mixed xylenes.

The invention relates to hydrosenation catalyst for producing oil by converting heavy coal tar pitch into light coal tar pitch, which is characterized in that: 100 portions of macroporous alumina is immersed into 100 portions of solution which consists of 3.5 to 20.5 weight percent of nickel nitrate and 3.0 to 25.0 weight percent of molybdenum nitrate for 2 hours at a temperature of between 50 and 60 DEG C; the mixture stands and supernatant is poured out, and then the mixture is dried for 4 hours at a temperature of 120 DEG C, activated for 5 hours at a temperature of 480 DEG C, and then immersed into cupric nitrate solution, cobalt nitrate solution, silver nitrate solution, ferric nitrate solution or bismuth nitrate solution with a concentration between 1.1 and 12.0 weight percent; and the catalyst is prepared through immersion, drying and activation which are the same as the above. The content of the nickel oxide and the molybdenum oxide in the catalyst is respectively 1.2 to 11.2 weight percent and 1.1 to 15.4 weight percent of the weight of carrier, and the content of cupric oxide, cobalt oxide, silver oxide, ferric oxide or bismuth oxide is 1.1 to 7.8 weight percent of the weight of the carrier. The hydrogenation catalyst has good adaptability to various coal tar pitch raw materials, high hydrogenation degree, strong controllability, low operating cost, and high yield of the oil produced by converting the heavy coal tar pitch into the light coal tar pitch; and the overall oil yield of fuel can reach over 75 percent.

The invention provides a process for the preparation of hydrocarbons comprising the steps of:

• (a) contacting a mixture of carbon monoxide and hydrogen at an elevated temperature and pressure with a mixture of a methanol synthesis catalyst and a methanol conversion catalyst thereby forming C₅⁺ hydrocarbons;
• (b) separating at least part of the C₅⁺ hydrocarbons as obtained in step (a) into a light stream and a heavy durene-rich stream;
• (c) subjecting at least part of the heavy durene-rich stream to a hydrodealkylation treatment in the presence of hydrogen to obtain a stream of hydrocarbons having a reduced durene content; and
• (d) mixing at least part of the light stream as obtained in step (b) with at least part of the stream of hydrocarbons having a reduced durene content as obtained in step (c).

The invention provides a catalyst for C10+ heavy arene hydrodealkylation and a preparation method thereof. The catalyst adopts a modified beta molecular sieve with a micropore-mesoporous composite structure as a carrier, and transition metal oxide and rare earth oxides as active components, wherein the transition metal oxide is a mixture of one or more of MoO3, Bi2O3, Co3O4 or CuO and NiO; the rare earth oxide is one or two of La2O3 or CeO2; the content of NiO is 2-16% of the mass of the carrier; the content of one or more of MoO3, Bi2O3, Co3O4 or CuO is 1-5% of the mass of the carrier; the content of the rare earth oxide is 0.4-2% of the mass of the carrier. The catalyst provided by the invention adopts the micropore-mesoporous composite structure, has stronger processing capacity to C10+heavy arene (equal to or greater than 40wt%), and can improve the C10+ heavy arene conversion rate and the mixed xylene selectivity.

The invention relates to a method for preparation of benzene, toluene and xylene from ethene cracking C9; an ethene cracking C9 raw material is extracted for separation of aromatic fractions and other non aromatic components, separation of aromatics can be performed in an extraction column, the separation temperature is 50 to 70 DEG C, the feeding weight ratio of an extracting agent to the ethene cracking C9 raw material is 4-10:1, the extracting agent is tetraglycol; the distillation range of aromatics extraction is controlled in the range of 135 to 220 DEG C; unsaturated aromatics are pre hydrogenated for hydrogenation saturation, pre hydrogenated C9 + aromatics is processed for lightening of heavyweight aromatics by catalytic hydrodealkylation method for preparation of the benzene, the toluene and the xylene; according to the method, the conversion rate of X (C9+) aromatics is 61.6 to 62.2; Y (BTX) (benzene, toluene and xylene) yield is 40.8-42.8; and S (BTX) selectivity is 67.96-8.8.

Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of added sulfur.

The invention discloses a process for deep dearylation of hydrocarbon oil which comprises, charging raw oil and hydrogen gas into hydrogenation reactor, contacting hydrodealkylation catalyst, isolating the reacted articles to obtain gaseous phase and liquid phase product, wherein the gaseous phase product is compressed for cycling use, the liquid phase product is isolated to obtain destination product of low aromatic hydrocarbons.

Methods and apparatus for processing hydrocarbons are provided. In one example, a method for processing hydrocarbons includes the step of providing feed stream including toluene, ethylbenzene, mixed xylenes, and C₉ hydrocarbons. Ethylbenzene is present in the feed stream in an amount of at least about 20% by weight of total C₈ aromatic hydrocarbons present in the feed stream. The method further includes the step of subjecting the feed stream to ethylbenzene conversion to form a benzene-containing product stream that includes benzene.

The invention provides a catalyst for preparing low carbon aromatic hydrocarbon by hydrodealkylation of C10+ heavyweight aromatic hydrocarbon. The catalyst is characterized in that the catalyst takesa composite molecular sieve as a carrier and a transition metal oxide and a rare earth oxide as active components, wherein the transition metal oxide is MoO3, and one or more of NiO, Bi2O3, Co3O4 or CuO; the rare earth oxide is one or two of La2O3 and CeO2; a content of MoO3 is 3-12% of the mass of the carrier; a content of NiO, Bi2O3 or Co3O4 is 0.5-2% of the mass of the carrier; and a content ofthe rare earth oxide is 0.2-1% of the mass of the carrier. A method of preparing low carbon aromatic hydrocarbon by the hydrodealkylation of C10+ heavyweight aromatic hydrocarbon has stronger processing capacity of C10+ heavyweight aromatic hydrocarbon (greater than or equal to 40wt%); a conversion rate of C10+ heavyweight aromatic hydrocarbon can be increased; and selectivity of low carbon aromatic hydrocarbon can be improved.

The invention relates to a C10+ heavy aromatic hydrocarbon hydrodealkylation catalyst and a preparation method thereof. The C10+ heavy aromatic hydrocarbon indicates monocyclic/polycyclic aromatic hydrocarbon with a carbon number more than or equal to 10 and a final boiling point not more than 300 DEG C. The C10+ heavy aromatic hydrocarbon hydrodealkylation catalyst provided by the invention is capable of treating the C10+ heavy aromatic hydrocarbon under the condition of hydrogenation and has the advantages of high C10+ heavy aromatic hydrocarbon transformation rate and high mixed xylene selectivity and C9 aromatic hydrocarbon selectivity and can be used for realizing the conversion to light fraction of the C10+ heavy aromatic hydrocarbon. The preparation method disclosed by the invention can be used for increasing the yield of BTX aromatic hydrocarbon and high-quality disproportionate raw materials by carrying out hydrodealkylation reaction by adopting a rare earth metal and transition metal modified mixed molecular sieve catalyst and taking the C10+ heavy aromatic hydrocarbon and light aromatic hydrocarbon which includes benzene and/or methylbenzene as raw materials.

The present invention relates to a process for producing benzene comprising the steps of: a) separating a source feedstream comprising C5-C12 hydrocarbons including benzene and alkylbenzenes into a first feedstream comprising a higher proportion of benzene than the source feedstream and a second feedstream comprising a lower proportion of benzene than the source feedstream and subsequently, b) contacting the first feedstream in the presence of hydrogen with a first hydrocracking catalyst comprising 0.01-1 wt-% hydrogenation metal in relation to the total catalyst weight and a zeolite having a pore size (as shown in the description) and a silica (SiO2) to alumina (Al2O3) molar ratio of 5-200 under first process conditions to produce a first product stream comprising benzene, wherein the first process conditions include a temperature of 425-580 DEG C, a pressure of 300-5000 kPa gauge and a Weight Hourly Space Velocity of 0.1-15 h-1, and c) contacting the second feedstream with hydrogen under second process conditions to produce a second product stream comprising benzene, wherein i) the second process conditions are suitable for hydrocracking and step (c) involves contacting the second feedstream in the presence of hydrogen with a second hydrocracking catalyst comprising 0.01-1 wt-% hydrogenation metal in relation to the total catalyst weight and a zeolite having a pore size of 5-8 and a silica (SiO2) to alumina (Al2O3) molar ratio of 5-200 under the second process conditions which include a temperature of 300-600 DEG C, a pressure of 300-5000 kPa gauge and a Weight Hourly Space Velocity of 0.1-15 h-1, ii) the second process conditions are suitable for toluene disproportionation and involve contacting the second feedstream with a toluene disproportionation catalyst, or iii) the second process conditions are suitable for hydrodealkylation.

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. The hydrodealkylated BTX+ stream is separated into BTX compounds.