37results about How to "Improve conversion depth" patented technology

Disclosed is a combination process for improved hydrotreating and catalytic cracking of hydrocarbon oils, including: contacting residual oil, catalytic cracking cycle oil, and optional distillate oil with a hydrotreating catalyst under hydrotreating conditions in the presence of hydrogen followed by separation of the reaction products to obtain hydrogenated tail oil and other products; contacting the hydrogenated tail oil and optional normal catalytic cracking feedstock oil with a cracking catalyst under catalytic cracking conditions followed by separation of the reaction products; wherein the hydrogenated tail oil and / or normal catalytic cracking feedstock oil are separated into at least two fractions prior to contacting the hydrogenated tail oil and / or normal catalytic cracking feedstock oil with the cracking catalyst.

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 relates to a catalytic cracking method which comprises the following steps: a heavy raw material is in contact with a catalyst containing shape-adaptive zeolite with the average pore size of less than 0.7nm in a first riser reactor with at least two reaction zones to perform cracking reaction; and a light raw material and cracked heavy oil are in contact with the catalyst containing shape-adaptive zeolite with the average pore size of less than 0.7nm in a second riser reactor and a fluidized bed reactor to perform cracking reaction. The method is used for the catalytic cracking of heavy oil; and the conversion rate of heavy oil and the yield of propylene are higher, and the yields of dry gas and coke are low.

The invention relates to a hydrocracking method for increasing production of high-quality middle distillates. The method comprises the following steps that: fresh feedstock oils are simultaneously introduced into a hydrofining reactor and a hydrocracking reactor in a co-current flow way; the hydrofining reactor is sequentially filled with a hydrofining catalyst and an amorphous hydrocracking catalyst; the hydrocracking reactor is sequentially filled with a hydrofining catalyst and a zeolite hydrocracking catalyst; a reaction effluent from the hydrofining reactor is separated to obtain light naphtha fractions and tail oil fractions; and all or part of the tail oil fractions are introduced into the hydrocracking reactor, and a reaction effluent from the hydrocracking reactor and part of the feedstock oils are introduced into the hydrofining reactor together. According to the method provided by the invention, the heavy distillates can be treated, and the maximum production of the middle distillates can be realized.

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 relates to an alloy type heavy aromatic hydrocarbon lightening catalyst and a preparation method thereof to mainly solve the problems of low conversion level of heavy aromatic hydrocarbon, low yield of monocyclic aromatic hydrocarbon, and high catalyst deactivation rate in the prior art. The technical scheme is that the catalyst provided by the invention comprises the following components in percentage by weight: 44-60.9% of at least one of FAU, BEA, MOR or MFI type zeolite, 10-30% of pseudo-boehmite, 0.1-0.5% of noble metal Ir, 2-6% of metal Ni and 0.5-3% of at least one of Zn and Bi. By adopting the technical scheme, the problems are well solved. The alloy type heavy aromatic hydrocarbon lightening catalyst is suitable for the chemical refining field of lightening heavy aromatic hydrocarbon into monocyclic aromatic hydrocarbon.

The invention provides a hydrocracking method for producing middle distillates to the maximum extent. The method comprises the following steps of: simultaneously leading fresh raw oil to a hydrorefining reactor and a hydrocracking reactor in a mode of parallel flow; filling a hydrorefining catalyst and an amorphous hydrocracking catalyst in the hydrorefining reactor in sequence; filling a molecular sieve hydrocracking catalyst in the hydrocracking reactor; separating reactor effluent of the hydrorefining reactor to obtain light fraction and tail oil fraction; and sending all or partial tail oil fraction to the hydrocracking reactor, and simultaneously sending reactor effluent of the hydrocracking reactor and partial raw oil to the hydrorefining reactor. The hydrocracking method for producing middle distillates to the maximum extent can process heavy distillates and produce middle distillates to maximum extent. Because partial raw oil is sent to the hydrocracking reactor, over high cracking activity of the hydrocracking catalyst is avoided under the non-ammonia environment of the hydrocracking reactor system, and the secondary cracking phenomenon of more middle distillates is also avoided, so that the yield of the middle distillates is effectively improved.

The invention discloses a method for reverse sequence hydrocracking. After the raw material, hydrogen and hydrocracking oil are mixed, they enter the hydrorefining reactor for reaction; the hydrofinishing effluent enters the separator and fractionation system to obtain the product and circulating oil; the circulating oil is mixed with hydrogen and enters the hydrocracking reaction The cracking reaction is carried out in the presence of a hydrocracking catalyst; at least two catalyst beds are arranged in the hydrocracking reactor, and a gas phase extraction pipeline is set between two adjacent catalyst beds; the gas phase stream is drawn to the In the high-pressure separator, the liquid phase passes through the catalyst bed below and is in countercurrent contact with the hydrogen entering from the bottom of the reactor to carry out the hydrocracking reaction. The process of the present invention is simple and easy to operate; since the cracked gas-phase light components are drawn out and directly enter the high-pressure separator, the secondary or multiple cracking reactions of this part of the light components are reduced, thereby effectively increasing the hydrocracking efficiency. Liquid product yield.

The present invention relates to a kind of descending type reactor and catalytic conversion method, this descending type reactor (1) comprises coaxial and fluidly connected agent oil contact section (15) and main reaction section (16) from top to bottom, described The agent oil contact section (15) is provided with catalyst inlet and raw material oil nozzle (12) from top to bottom, and the inner wall of described main reaction section (16) is provided with at least one annular Baffle (14). The catalytic conversion method using the down-flow reactor of the present invention has high and low-carbon olefin yields.

The invention provides a hydrocracking method increasing liquid yield of products. A gas-phase lead-out pipeline is disposed in a catalyst bed layer of a hydrocracking reactor. A gas-phase material flow in a reactor is leaded-out to a high-pressure separator through the gas-phase lead-out pipeline in the catalyst bed layer, while a liquid phase is counter-current contacted with hydrogen fed from the bottom of the reactor through a lower catalyst bed layer to perform a hydrocracking reaction. The hydrocracked gas-phase light fraction is directly fed into the high-pressure separator so that secondary or multiple cracking reactions are reduced. The hydrocracking method can increase the liquid yield of the products, can reduce the consumption of hydrogen and can prolong the service life of a catalyst.

The invention relates to a hydrotreating method for maximum production of middle distillates. The method comprises the following steps that: fresh feedstock oils are simultaneously introduced into a hydrofining reactor and a hydrocracking reactor in a co-current flow way; the hydrofining reactor is sequentially filled with a hydrofining catalyst and an amorphous hydrocracking catalyst; the hydrocracking reactor is sequentially filled with an amorphous hydrocracking catalyst and a zeolite hydrocracking catalyst; and all or part of the tail oil fractions are introduced into the hydrocracking reactor, and a reaction effluent from the hydrocracking reactor and part of the feedstock oils are introduced into the hydrofining reactor together. According to the method provided by the invention, the heavy distillates can be treated, and the maximum production of the middle distillates can be realized. Only the tail oil fractions are introduced into the hydrocracking reactor, so that the selectivity of middle distillates is improved; and part of the feedstock oils is introduced into the hydrocracking reactor, so that the phenomenon that more middle distillates are cracked secondarily in an ammonia-free environment in the hydrocracking reactor is avoided, and thus the yield of the middle distillates is effectively improved.

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.