36results about How to "Improve conversion depth" patented technology

The invention relates to a catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons and a preparation method thereof, mainly solving the problems in the prior art that the conversion level of polycyclic aromatic hydrocarbons is low, the monocyclic aromatic hydrocarbon yield and selectivity are low and the catalyst deactivation rate is high. The problems are better solved by adopting the catalyst and the preparation method thereof. The catalyst comprises 34.5-60wt% of mixture of FAU type zeolite and at least one molecular sieve from MOR, BEA, MFI and MCM-22, 39.5-65wt% of at least one of gamma-alumina, eta-alumina and pseudo-boehmite as a binder and 0.05-0.9wt% of at least one metal from Pt, Pd and Ir. The catalyst can be used in the industrial production of converting heavy polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons.

The invention discloses a two-stage method coal tar hydro-upgrading method. Coal tar is subject to the atmospheric distillation and/or the reduced pressure distillation and is cut into coal tar light cut and coal tar heavy cut; after the coal tar light cut and optional distillate oil are mixed with hydrogen, the mixture enters a first hydrogeneration reaction zone and performs the contact reaction with hydrorefining catalyst; gas phase impurities of a reaction effluent is removed through an intermediate flash distillation column or a high-pressure stripping tower, and then the reaction effluent enters a second hydrogeneration reaction zone to perform the contact reaction with the hydro-upgrading catalyst or the hydrocracking catalyst; and the obtained reaction effluent is cooled, separated and fractionated to produce diesel fraction and naphtha cut. The invention provides a clean and effective coal tar processing and utilizing method, the coal tar light cut is hydro-upgraded to produce diesel oil for vehicles, the sulfur content of the obtained diesel product is less than 50 mu g/g, the content of polycyclic aromatic hydrocarbon is less than 11 weight percent, and the diesel oil cetane number of the product is improved by not less than 20.

The invention discloses a catalytic cracking method for producing propylene, comprising the following steps: contacting heavy feed stock with a first stream of a catalyst containing shape-selective zeolite with an average pore size being less than 0.7nm in a first riser reactor to conduct cracking reaction, then separating the oiling agent, introducing oil gas into a product separation system, and introducing the catalyst into a stripper or a fluidized bed reactor; contacting the recycled cracking heavy oil with a second stream of the catalyst containing shape-selective zeolite with an average pore size being less than 0.7nm in a second riser reactor to conduct cracking reaction, then letting the obtained oiling agent mixture and the light hydrocarbon introduced into the second riser reactor be subject to contact reaction, then introducing the reaction mixture into a fluidized bed combined reactor for reacting, introducing the reacted oil gas into the product separation system, and introducing the reacted catalyst into the stripper. According to the invention, the method is used for heavy oil catalytic cracking, the heavy oil conversion rate is high, the yields of propylene and butene are high, and the selectivity of dry gas and coke is good.

The invention relates to a method for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons, mainly solving the problems in the prior art that the conversion level of polycyclic aromatic hydrocarbons is low, the monocyclic aromatic hydrocarbon yield and selectivity are low and the catalyst deactivation rate is high. The problems are better solved by adopting the technical scheme that polycyclic aromatic hydrocarbon mixtures and hydrogen are taken as the raw materials and are contacted with a catalyst in a fixed bend reactor to react under the conditions that the reaction temperature is 335-440 DEG C, the pressure is 4-7MPa, the weight hourly space velocity is 1-3hr<-1> and the hydrogen/hydrocarbon mole ratio is 4.0-8.0 to generate monocyclic aromatic hydrocarbon mixtures. The method can be used in the industrial production of converting heavy polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons.

The invention discloses a method for reverse hydrocracking. The method comprises the following steps that: a raw material, hydrogen and oil produced after hydrocracking are mixed and the obtained mixture enters a hydrofinishing reactor for a reaction; hydrofinishing effluent enters a separator and a fractionation system so as to obtain a product and cycle oil; cycle oil and hydrogen are mixed and then the obtained mixture enters a hydrocracking reactor and undergoes a cracking reaction in the presence of a hydrocracking catalyst; the hydrocracking reactor is provided with at least two catalyst beds and a gas phase leading-out pipeline is arranged between two adjacent catalyst beds; and a gas phase material flow is lead out to a high-pressure separator via the gas phase leading-out pipeline, and a liquid phase passes through the underneath catalyst beds and contacts with hydrogen in a countercurrent way for a hydrocracking reaction, wherein the hydrogen enters from the bottom of the reactor. The method provided by the invention is simple and is easy to operate; and since a cracked gas-phase light component is extracted and directly enters the high-pressure separator, secondary or multitime cracking reaction of the light component is reduced, so the yield of a hydrocracking liquid product can be effectively improved.

The invention discloses a method and a system for catalytic conversion of poor quality raw material oil. The method comprises: feeding poor quality raw material oil into a riser reactor, carrying outa catalytic conversion reaction, feeding the obtained reaction product into a product separation unit, separating, and carrying out aromatic hydrocarbon extraction on the obtained diesel oil, whereinthe partial regeneration catalyst is added to the second diameter expanding section after the partial semi-spent catalyst is taken out from the first diameter expanding section at the middle portion of the riser reactor. According to the present invention, with the method and the system, the poor quality raw material oil is converted into high octane number gasoline and propylene while the yieldsof dry gas and coke are greatly reduced so as to achieve the efficient utilization of petroleum resources.

The invention relates to a method for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene, mainly solving the problems in the prior art that the conversion level of polycyclic aromatic hydrocarbons is low, the dimenthylbenzene yield and selectivity are low and the catalyst deactivation rate is high. The problems are better solved by adopting the technical scheme that polycyclic aromatic hydrocarbon mixtures and hydrogen are taken as the raw materials and are contacted with a catalyst in a fixed bend reactor to react under the conditions that the reaction temperature is 330-420 DEG C, the reaction pressure is 4-7MPa, the weight hourly space velocity is 1-3hr<-1> and the hydrogen-hydrocarbon mole ratio is 5.0-8.0 to generate monocyclic aromatic hydrocarbon mixtures producing more dimethylbenzene. The method can be used in the industrial production of increasing production of dimethylbenzene by converting heavy polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons.

The present invention relates to a downer reactor and a catalytic conversion method. The downer reactor (1) sequentially comprises an agent-oil contact section (15) and a main reaction section (16) from top to bottom, wherein the agent-oil contact section (15) and the main reaction section (16) are coaxially arranged and are fluidly communicated, the agent-oil contact section (15) is sequentiallyprovided with a catalyst inlet and a raw material oil spraying nozzle (12) from top to bottom, and the inner wall of the main reaction section (16) is provided with at least an annular baffle (14) coaxial with the main reaction section (16). The catalytic conversion method using the downer reactor of the present invention has high low-carbon olefin yield.

Disclosed is a hydrogenation method for increasing cetane number of diesel oil. According to the invention, a reaction unit is provided with three sequentially arranged reaction zones; in a first reaction zone, a hydrobon catalyst I is filled and a hourly space velocity is 0.5 to 5.0 h <-1>; in a second reaction zone, a hydroupgrading catalyst is filled and a hourly space velocity is 1.0 to 8.0 h <-1>; in a third reaction zone, a hydrobon catalyst II is filled and a hourly space velocity is 1.5 to 12.0 h <-1>; the acidity of the hydrobon catalyst I is less than that of the hydrobon catalyst II. With the utilization of the method provided in the invention, cracking of open loops of annular aromatic hydrocarbons with more than two rings in the raw materials can be realized and the reaction of long-chain alkane cracking into short-chain alkane and the scission reaction of annular hydrocarbon with long side chains can be reduced; therefore, cetane number of diesel oil can be greatly increased under the condition that high yield of diesel oil is maintained.

The invention discloses a pretreatment method of a heavy and/or inferior oil slurry bed hydrogenation upgrlading iron-based catalyst. According to the method, a fresh iron-based catalyst is mixed with a pretreatment regulator, and then the catalyst is pretreated under the conditions of specific pretreatment airflow, pressure and the like, so that the hydrogenation activity of the iron-based catalyst is improved. The pretreatment method provided by the invention is controllable in condition, and the treated catalyst has the characteristics of high activity, strong coke inhibition capability and high distillate oil yield, and is beneficial to long-period stable operation of a device, so that the economical efficiency of a heavy and/or inferior oil slurry bed hydrogenation process is improved.

Disclosed is a method for producing methanol synthetic gas with hydrocarbon gas and coal as raw materials, which comprises preparing methanol synthetic gas using gaseous hydrocarbon and coal as raw material, mixing by the following proportion, 0.5-1 part of methanol synthetic gas by using gaseous hydrocarbon as the raw material, 1 part of methanol synthetic gas by using coal as the raw material, making the hydrogen-carbon ratio of the obtained methanol raw material gas to be (H2-CO2)/(CO+CO2)=2.0-2.1, compressing and loading into methanol synthesizing procedure.