69results about How to "Fang Qiangao" patented technology

The invention relates to a composite mesoporous molecular sieve hydrocracking catalyst and the application thereof. The catalyst composed of following components of 20 to 50 percent of amorphous silica-alumina, 5 to 30 percent of alumina, 10 to 25 percent of adhesives, 10 to 40 percent of Group VIB-the metal oxides, 1 to 20 percent of Group VIII-the metal oxides, 0.1 to 10 percent of Group VA-the metal oxides, and 1 to 40 percent of composite mesoporous molecular sieve, wherein, the composite mesoporous molecular sieve is a composite molecular sieve composed of a mesoporous molecular sieve AlSBA-15 and / or AlSBA-15 / Y; the weight ratio of the composite molecular sieve AlSBA-15 / Y in the AlSBA-15 and a Y molecular sieve is 9:1 to 1:9; the weight ratio of the mesoporous molecular sieve and a pore molecular sieve is 3:1 to 1:3, the silica alumina ratio is 10:1 to 40:1, and the silica alumina ratio of the Y molecular sieve is 5:1to 20 :1. The catalyst used for hydrocracking for heavy oil shows high activity for hydrocracking and high medium oil selectivity.

The present invention relates to a hydrogenation method for flexible production of diesel oil and chemical raw material, heavy raw material and optional light raw material mix with hydrogen, and enter into a first hydrogenation reaction area and a second hydrogenation reaction area, and contact with hydrogenation treatment catalyst I and hydrogenation cracking catalyst respectively and perform reaction. Without separation, the reactant mixes with the light raw material and enters into a third hydrogenation reaction area, under the action of hydrogenation treatment catalyst II, the mixture performs the reaction, through the reactant is cooled, separated and fractionated, the light naphtha distillate, the heavy naphtha distillate, the diesel oil distillate and the tail oil distillate can be got. The method provided by the present invention combines the hydrogenation treatment and the hydrogenation cracking organically, the heavy distillates such as decompression gas oil, etc. and the ungraded light distillate got from the second time processing are used as raw material, the operation can be adjusted flexibly according to the market demand, so as to produce high quality diesel oil or chemical raw material in the maximum volume, wherein the diesel oil can meet the requirement of Europe IV fuel specification.

The invention discloses a hydrocracking method of low-nergy-onsumption productive high-quality chemical raw materials. After raw oil and hydrogen are mixed, the obtained mixture is subjected to heat transfer for two times and then passes through a heating furnace, the obtained object is sequentially subjected to hydrorefining and then passes through a first cracking reaction area, the obtained product is separated so as to obtain middle distillate, the middle distillate enters a second cracking reaction area to crack, wherein the first cracking reaction area is at least filled with two cracking catalysts, a catalyst I is filled in the upstream part, and a catalyst II is filled in the downstream part; and the catalyst I contains 30-70% of modified Y molecular sieve, the catalyst II contains 15-50% of modified Y molecular sieve, and the content of the modified Y molecular sieve in the catalyst I is 10-30% higher than the content of the modified Y molecular sieve in the catalyst II. In the method disclosed by the invention, a high-temperature and high-pressure countercurrent heat transfer technology and a hydrocracking catalyst grading technology are organically combined, and through the comprehensive utilization of hydrocracking reaction heat, while the selectivity of catalysts is maintained, the product quality is enhanced, and the construction investment and the energy consumption of operation are reduced.

The invention discloses a hydrocracking method of a high-yield high-quality chemical raw material. According to the hydrocracking method comprises following steps: raw oil and hydrogen are subjected to hydrofinishing and are delivered through a first cracking reaction zone successively, and middle fraction oil is obtained via separation, and is delivered to a second cracking reaction zone for cracking; the first cracking reaction zone comprises two cracking catalysts, an upper zone is filled with a catalyst I, and a lower zone is filled with a catalyst II; the catalyst I comprises 30 to 70% of modified Y molecular sieve; the catalyst II comprises 15 to 50% of modified Y molecular sieve; and the content of the modified Y molecular sieve in the catalyst I is 10 to 30% higher than that in the catalyst II. Acid center of the catalyst I matches hydrogenation center, and the catalyst I possesses excellent heavy naphtha selectivity; and the catalyst II possesses excellent aromatic hydrocarbon transformative capacity, and is capable of transforming aromatic hydrocarbons in heavier components into smaller molecules so as to distribute in heavy petroleum fractions. The two catalysts are combined, so that demands of the high-yield high-quality chemical raw material are satisfied.

The invention discloses a two-stage hydrocracking method used for producing high-quality chemical raw materials. The two-stage hydrocracking method comprises following steps: (1) raw material oil is mixed with hydrogen, and an obtained mixture is subjected to hydrofinishing reaction; (2) a refining reaction product is subjected to gas-liquid separation; (3) an obtained liquid product and hydrogen are subjected to hydrocracking reaction, and are contacted with a catalyst I and a catalyst II successively, wherein molecular sieve content of the catalyst I and molecular sieve content of the catalyst II are different; and (4) a hydrocracking effluent is subjected to separation and fractionation so as to obtain a plurality of hydrocracking products. The molecular sieve content of the hydrocracking catalyst I is higher, acid center of the hydrocracking catalyst I matches hydrogenation center, and the hydrocracking catalyst I possesses excellent heavy naphtha selectivity; and the catalyst II possesses excellent aromatic hydrocarbon transformative capacity, and is capable of transforming aromatic hydrocarbons in heavier components of the raw material oil into smaller molecules so as to distribute in heavy petroleum fractions. The two hydrocracking catalysts with different molecular sieve contents are combined, so that aromatic hydrocarbon potential content of heavy naphtha is increased, and tail oil BMCI value is reduced.

The present invention discloses a hydrocracking process. According to the hydrocracking process, heavy distillate oil and hydrogen gas are mixed and then enter a hydrorefining reactor to carry out a hydrorefining reaction; the hydrorefining reaction effluent directly enters a hydrocracking reactor and is subjected to a contact reaction with grading and mixing catalyst bed layers filled in the hydrocracking reactor, wherein at least two mixing catalyst bed layers are arranged inside the hydrocracking reactor, and the hydrogenation activity of the hydrocracking mixing catalyst presents the decrease tendency according to the reaction material flowing direction; and the hydrocracking reaction effluent is subjected to separation and fractionation to obtain the hydrocracking products including heavy naphtha and tail oil. With the method of the present invention, the heavy component hydrocracking effect can be ensured while the excessive hydrogenation and the excessive cracking of the heavy naphtha are reduced, and the chemical hydrogen consumption is reduced, such that the aromatic potential and the selectivity of the heavy naphtha are increased.

The invention relates to a hydrocracking method for reforming material yield increase. Raw oil and hydrogen gas are mixed and then the mixture is sequentially subjected to hydrorefining reaction and hydrocracking reaction, reaction effluent is cooled and separated, and then, the obtained light diesel fractions with the volume percentage being 10 to 100 percent and the distillation range being 220 to 320 DEG C return to a hydrocracking reaction vessel for continuous reaction. Because the arene content and cyclane content of the part of fractions are high, the fractions are proper fractions for high-quality heavy naphtha yield increase, and the yield of aviation fuel and the cetane number of the diesel fractions can also be improved through recycling the fractions. When the method provided by the invention is adopted, the recycled light diesel fractions enter the hydrocracking reaction vessel instead of a raw material tank and do not pass through a hydrorefining reaction vessel, so few arene and cyclane parts take hydrosaturation reaction, the potential arene of the heavy naphtha is favorably improved, and the hydrogen consumption is favorably reduced.

The invention discloses a hydrocracking method of low-nergy-onsumption productive high-quality chemical raw materials. After raw oil and hydrogen are mixed, the obtained mixture is subjected to heat transfer for two times and then passes through a heating furnace, the obtained object is sequentially subjected to hydrorefining and then passes through a first cracking reaction area, the obtained product is separated so as to obtain middle distillate, the middle distillate enters a second cracking reaction area to crack, wherein the first cracking reaction area is at least filled with two cracking catalysts, a catalyst I is filled in the upstream part, and a catalyst II is filled in the downstream part; and the catalyst I contains 30-70% of modified Y molecular sieve, the catalyst II contains 15-50% of modified Y molecular sieve, and the content of the modified Y molecular sieve in the catalyst I is 10-30% higher than the content of the modified Y molecular sieve in the catalyst II. In the method disclosed by the invention, a high-temperature and high-pressure countercurrent heat transfer technology and a hydrocracking catalyst grading technology are organically combined, and through the comprehensive utilization of hydrocracking reaction heat, while the selectivity of catalysts is maintained, the product quality is enhanced, and the construction investment and the energy consumption of operation are reduced.

The present invention provides a kind of hydrogen cracking method of raising middle oil selectivity and product quality simultaneously. Catalyst containing Y-type molecular sieve and catalyst containing beta-type molecular sieve are filled inside the reactor separately in different layers. Catalyst containing Y-type molecular sieve and catalyst containing beta-type molecular sieve are filled in the upper part and the lower part of the reactor separately; or, catalyst containing Y-type molecular sieve and catalyst containing beta-type molecular sieve are filled in the lower part and the upper part of the reactor separately, so at to make them give their play to raise the quality of oil product.

The invention discloses a hydro-cracking method for reducing bromine index of heavy naphtha. The method comprises the following steps: mixing raw oil and hydrogen, then introducing the mixture into ahydro-refining reactor, carrying out a hydro-refining reaction; introducing the reaction effluent into a hydro-cracking reactor, introducing the oil generated by hydro-cracking into a fractionating tower after going through a high-pressure separator and a low-pressure separator so as to obtain dry gas, liquefied gas, light naphtha, heavy naphtha, light aviation kerosene, heavy aviation kerosene, diesel oil and tail oil, and returning part or all of the light aviation kerosene to the hydro-cracking reactor. According to the method, the content of aromatic hydrocarbons and cyclo-alkane in reactants and ammonia partial pressure can be effectively improved, and secondary cracking reaction of paraffin is inhibited, so that the purposes of reducing the bromine index of heavy naphtha and increasing aviation kerosene smoke point are achieved.

The present invention relates to the field of diesel oil processing, and discloses a hydrocracking method for producing chemical industry raw materials from diesel oil distillates. The hydrocracking method comprises: introducing diesel oil distillates into a hydrocracking reaction zone containing a hydrocracking catalyst, carrying out a hydrocracking reaction, and separating the reaction productsobtained after the hydrocracking reaction to obtain light naphtha, heavy naphtha and a tail oil distillate, wherein the chain alkane content in the diesel oil distillates is 20-50 wt%. According to the present invention, with the hydrocracking method, the chemical industrial raw material can be produced from the diesel oil distillate under the medium-low pressure condition, wherein the heavy naphtha can be used as the high-aromatic-potential-content reforming raw material, and the light naphtha and the tail oil can be used as the high-quality steam cracking raw material.

The invention discloses a flexible reverse-sequence hydrocracking process. The process comprises the following steps: mixing wax oil raw oil with a hydrocracked material; carrying out hydrogenation pretreatment; carrying out separation fractionation on the hydrogenation pretreated material flow to obtain gas, distillate oil and tail oil; carrying out hydrocracking pretreatment on the obtained tailoil, allowing the tail oil to pass through a first hydrocracking catalyst bed layer in a hydrocracking reactor to obtain a material, and dividing the obtained material into two streams; separating one material stream in a separator, extracting the obtained liquid phase out of the hydrocracking reactor, and subjecting the liquid phase to an isomerization cracking reaction in a hydroisomerization cracking reactor; allowing the other material stream to flow downward to pass through a second hydrocracking catalyst bed layer; and carrying out gas-liquid separation and fractionation on a hydroisomerization cracking reaction product to obtain hydroisomerization cracked naphtha, aviation kerosene, diesel oil and tail oil products. The invention provides the hydrocracking process for simultaneously producing more than two different-specification light naphtha, heavy naphtha, aviation kerosene, diesel oil and tail oil products on a set of hydrogenation process equipment.

The invention discloses a hydrocracking method for producing chemical materials. The method comprises the steps of entering raw material oil and hydrogen into a hydrorefining reactor for performing hydrodesulfurization, hydro-denitrification, olefin saturation and partial aromatic saturation under the action of a hydrorefining catalyst; and carrying out contact reaction on the obtained effluent and a hydrocracking catalyst in a hydrocracking reactor. According to the method provided by the invention, the required transformation depth can be reached under a relatively mild reaction condition; heavy naphtha is good in selectivity; and long-term operation of a device is realized.

The invention discloses a hydrocracking process for flexibly producing diesel oil. A wax oil raw material is subjected to hydrogenation pretreatment and then enters a hydrocracking reactor, and a hydrocracked material passing through a hydrocracking catalyst bed layer is divided into two streams; one stream of the hydrocracked material is subjected to gas-liquid separation and fractionation to obtain naphtha, aviation kerosene, diesel oil and tail oil; and the other stream of the hydrocracked material is mixed with a part or all of hydrocracking tail oil, and the mixture is fed into a hydrogenation isomerization cracking reactor and subjected to isomerization cracking; and a hydrogenation isomerization cracking product is subjected to gas-liquid separation and fractionation to obtain naphtha, aviation kerosene, diesel oil and tail oil. The invention provides the process for simultaneously producing more than two types of aviation kerosene, diesel oil and tail oil products with different specifications on one set of hydrogenation process equipment, especially diesel oil products with different condensation points, heat carried by a part of cracked materials can be fully utilized, and coupling operation of the hydrocracking reactor and the hydrogenation isomerization cracking reactor can be realized.

The present invention provides one kind of hydrocracking process with simultaneously raised medium oil selectivity and product quality. By means of laminated filling of type-Y molecular sieve catalyst and type-beta molecular sieve catalyst, that is, filling the type-Y molecular sieve catalyst in the lower part of the reactor and filling the type-beta molecular sieve catalyst in the upper part of the reactor, two different kinds of molecular sieve catalyst have their characteristics utilized fully in raising medium oil selectivity and product quality simultaneously.

The invention discloses a hydrogenation method for producing clean gasoline. The method comprises the following steps: (1) enabling mixed oil for catalyzing light circulation oil and catalyzing heavycirculation oil to be mixed with hydrogen, entering a hydrogenation pre-processing reactor, and reacting under the action of a hydrofining catalyst; (2) enabling a hydrogenation effluent in the step (1) to enter a hydrocracking reactor, and reacting under the action of a hydrocracking catalyst, wherein an average pore size of the hydrocracking catalyst shows a decreasing tendency along a flowing direction of a material flow; and (3) separating the hydrogenation effluent in the step (2) to a gas phase and a liquid phase, circularly using the gas phase, and enabling the liquid phase to enter a fractionating tower; fractionating in the fractionating tower, to obtain naphtha, diesel oil and unconverted oil; and circulating the unconverted oil to the hydrocracking reactor. The method is capableof greatly improving a gasoline product yield with a high added-value and a hexadecane value of the diesel oil.

The invention discloses a hydrocracking catalyst, a preparation method and application thereof. The hydrocracking catalyst comprises 1-50 percent of modified silicon-boron-oxygen crystallization material, 1-50 percent of Y zeolite, 10-60 percent of amorphous silicon aluminum, 10-40 percent of VIB-family metal oxide and 1-10 percent of VIII-family metal oxide, wherein the mol ratio of SiO2 / B2O3 ofthe modified silicon-boron-oxygen crystallization material is 20-150, the volume of a secondary pore with pore diameter of more than 2nm is above 40 percent of the total volume, the specific surface is 500-750m<2> / g, and infrared acidity is 0.05-0.50mmol / g. The catalyst has excellent hydrocracking performance and hydrodewaxing performance, good activity and high middle-oil selectivity, is suitable for a hydrocracking process of producing jet fuel and clean diesel, and is especially suitable for producing low-condensation point diesel.

The invention discloses a flexible two-stage hydrocracking method. A wax oil raw material enters a separation system after hydrogenation pretreatment and mild hydrocracking; a separated liquid phase without impurities is divided into two parts; one part of the liquid phase enters a hydrocracking reactor using a reduction state hydrocracking catalyst; the other part of the liquid phase and hydrocracking tail oil are mixed and enter a hydroisomerization cracking reactor using a reduction state hydroisomerization cracking catalyst; an obtained hydrocracking reaction material and an obtained hydroisomerization cracking reaction material are subjected to gas-liquid separation and fractionation respectively to obtain naphtha, aviation kerosene, diesel oil and tail oil products of different specifications. The invention provides the two-stage hydrocracking process for simultaneously producing more than two types of light naphtha, heavy naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on one set of hydrogenation process equipment for the first time.

The invention discloses a hydrocracking method used for producing high-quality chemical raw materials. According to the hydrocracking method, raw material oil and hydrogen are delivered through a hydrofinishing reaction zone and a hydrocracking reaction zone successively; the hydrocracking reaction zone comprises at least two hydrocracking catalysts, the upper part of the hydrocracking reaction zone is filled with a hydrocracking catalyst I, and a lower part of the hydrocracking reaction zone is filled with a hydrocracking catalyst II; the hydrocracking catalyst I comprises 30 to 70wt% of modified Y molecular sieve; the hydrocracking catalyst II comprises 15 to 50wt% of modified Y molecular sieve; and the content of modified Y molecular sieve of the hydrocracking catalyst I is 10 to 30wt% higher than that of the hydrocracking catalyst II. Acid center of the hydrocracking catalyst I matches hydrogenation center, and the hydrocracking catalyst I possesses excellent heavy naphtha selectivity; and the catalyst II possesses excellent aromatic hydrocarbon transformative capacity, and is capable of transforming aromatic hydrocarbons in heavier components into smaller molecules so as to distribute in heavy petroleum fractions. The two catalysts are combined, so that product quality is improved obviously, aromatic hydrocarbon potential content of heavy naphtha is increased 3 to 10%, and tail oil BMCI value reduces 3 to 5 units.

The invention discloses a hydrocracking method. After the heavy distillate oil is mixed with hydrogen, it first enters the hydrofinishing reactor for hydrofinishing reaction; the hydrofinishing reaction effluent directly enters the hydrocracking reactor, and contacts and reacts with the graded catalyst bed in the cracking reactor; At least two cracking catalyst beds are arranged in the hydrocracking reactor, and the hydrogenation activity of the hydrocracking catalyst tends to decrease according to the flow direction of the reaction materials; the hydrocracking reaction effluent is separated and fractionated to obtain heavy naphtha Hydrocracking products including tail oil. The method of the invention can reduce the over-hydrogenation and over-cracking of the heavy naphtha while ensuring the hydrocracking effect of the heavy component, and reduce the chemical hydrogen consumption, thereby improving the aroma potential and selectivity of the heavy naphtha.

The invention discloses a flexible hydrocracking process for producing lubricant base oil. A material obtained after a wax oil raw material is subjected to hydrogenation pretreatment is divided into two parts; a part of the material is separated by a hot high-pressure separator to obtain a liquid phase, and the liquid phase is mixed with hydrogen and then passes through a hydrocracking catalyst bed layer containing a Y-type molecular sieve; the other part of the material is mixed with a gas phase obtained by hot high-pressure separation and hydrocracking tail oil and then passes through a hydroisomerization cracking catalyst bed layer containing an isomerization cracking type molecular sieve; a hydrocracking reaction product and a hydroisomerization cracking reaction product are subjectedto gas-liquid separation and fractionation separately to obtain distillate oil and tail oil products with different specifications; and the hydrocracking tail oil is partially or completely circulatedinto the isomerization cracking reactor. The process provided by the invention can be used for simultaneously producing more than two kinds of naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on one set of hydrogenation process equipment, especially producing high-quality lubricant base oil.

The present invention relates to a hydrogenation method for flexible production of diesel oil and chemical raw material, heavy raw material and optional light raw material mix with hydrogen, and enter into a first hydrogenation reaction area and a second hydrogenation reaction area, and contact with hydrogenation treatment catalyst I and hydrogenation cracking catalyst respectively and perform reaction. Without separation, the reactant mixes with the light raw material and enters into a third hydrogenation reaction area, under the action of hydrogenation treatment catalyst II, the mixture performs the reaction, through the reactant is cooled, separated and fractionated, the light naphtha distillate, the heavy naphtha distillate, the diesel oil distillate and the tail oil distillate can begot. The method provided by the present invention combines the hydrogenation treatment and the hydrogenation cracking organically, the heavy distillates such as decompression gas oil, etc. and the ungraded light distillate got from the second time processing are used as raw material, the operation can be adjusted flexibly according to the market demand, so as to produce high quality diesel oil orchemical raw material in the maximum volume, wherein the diesel oil can meet the requirement of Europe IV fuel specification.

The invention discloses a hydrocracking method for improving aromatic potential of heavy naphtha. The method comprises the following steps: (1) high-nitrogen raw oil and hydrogen are fed into a hydrogenation reactor, and hydrofining reaction is conducted at the reaction temperature of 350-370 DEG C; (2) hydrofining generated oil is divided into a light fraction and a heavy fraction, wherein the cutting temperature of the light fraction and the heavy fraction is 440-520 DEG C; (3) a hydrocracking reactor comprises an upstream hydrofining catalyst bed layer and a downstream hydrocracking catalyst, the light fraction directly enters the middle of a hydrocracking reactor bed, the heavy fraction enters from an inlet of the cracking reactor and is sequentially subjected to contact reaction with hydrofining and hydrocracking catalysts; and (4) separation and fractionation are conducted on hydrocracking effluent to obtain hydrocracking products including heavy naphtha. According to the method, the aromatic hydrocarbon potential content of the obtained heavy naphtha component is increased, and the method has a relatively high application prospect.

The invention discloses a flexible hydrocracking method for producing lubricant base oil. The method includes dividing a wax oil raw material subjected to hydrogenation pretreatment into two parts; separating one part of the material by a hot high-pressure separator to obtain a gas phase and a liquid phase; mixing the other part of the material with the gas phase obtained by hot high-pressure separation and circulating hydrogen, and allowing the mixture to pass through a hydrocracking catalyst bed layer containing a Y-type molecular sieve; mixing the liquid phase obtained by hot high-pressureseparation with hydrocracking tail oil and circulating hydrogen, and allowing the mixture to pass through a hydroisomerization cracking catalyst bed layer containing an isomerization cracking type molecular sieve; respectively carrying out gas-liquid separation and fractionation on a hydrocracking reaction product and a hydroisomerization cracking reaction product to obtain distillate oil and tailoil products with different specifications; and partially or completely circulating the hydrocracking tail oil to an isomerization cracking reactor. The invention provides the flexible hydrocrackingmethod for simultaneously producing more than two kinds of naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on a set of hydrogenation process equipment for the first time, especially high-quality lubricant base oil.

The invention discloses a white carbon black modified hydrocracking catalyst and a preparation method thereof. In the hydrocracking catalyst disclosed by the invention, a Y molecular sieve is used for acid cracking of components; the metal salts of groups VIB and VIII are adopted as hydrogenation components; white carbon black serves as a binder matrix; a finished product of the catalyst is prepared by combining kneading and impregnation. According to the experimental result, the white carbon black can perfectly reduce interaction between the metal components and the carrier. The catalyst is applied to the hydrocracking of inferior / heavy diesel to produce naphtha; moreover, apart from relatively high hydrogenation selectivity, the catalyst has the characteristics of high aromatic potential in heavy naphtha, low BMCI in tail gas and high yield of C5+ liquid.

The invention discloses a hydrocracking process for flexibly producing diesel oil. After the wax oil raw material is pretreated by hydrogenation, it enters the hydrocracking reactor, and the obtained hydrocracking material is divided into two streams, one of which enters the hot high-pressure separator to separate the gas phase and liquid phase; the one that does not enter the high-pressure separator The hydrocracked material is mixed with the gas phase separated by the hot high-pressure separator for gas-liquid separation and fractionation to obtain hydrocracked naphtha, jet fuel, diesel oil and tail oil; the liquid phase separated by the hot high-pressure separator and / or After all the hydrocracking tail oil is mixed, continue to mix with hydrogen for hydroisomerization cracking reaction, and the hydroisomerization cracking material undergoes gas-liquid separation and fractionation to obtain hydroisomerization cracking naphtha, jet fuel, diesel oil and tail oil . The invention provides for the first time a hydrocracking process for simultaneously producing more than two types of jet fuel, diesel oil and tail oil products of different specifications, especially diesel oil with different freezing points, on a set of hydrogenation process equipment.

The invention discloses a flexible single-stage two-catalyst hydrocracking process. A wax oil raw material and hydrogen are mixed and then enter a single-stage two-catalyst hydrocracking reactor, andthe material passing through an upper hydrogenation pretreatment catalyst bed layer and a single-stage hydrocracking catalyst bed layer is divided into two streams; one material stream is extracted out of the single-stage reactor from the middle of the bed layers, enters a hydroisomerization cracking reactor and subjected to isomerization cracking reaction; the other material stream flows downwards through a single-stage hydrocracking catalyst bed layer at the lower part; and a single-stage hydrocracking reaction product and a hydroisomerization cracking reaction product are respectively separated and fractionated to obtain distillate oil and tail oil products with different specifications. The invention provides the process for simultaneously producing more than two types of light naphtha, heavy naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on a set of hydrogenation process equipment. In the process, heat carried by part of cracked materials can be fully utilized, and coupling operation of the single-stage two-catalyst hydrocracking reactor and the hydroisomerization cracking reactor is achieved.

The invention discloses a combined hydrogenation method of producing chemical materials. The method comprises the steps of: mixing hydrocracking material oil with hydrogen, and then entering a mixture into a hydrorefining reactor and a first hydrocracking reactor by adopting a once serial process; further cracking 10-100% diesel fraction with the temperature of 175-320 DEG C in the second hydrocracking reactor which is arranged in a diesel refining unit, wherein the cracked oil is a mixed fraction of naphtha and diesel; and further fractioning the mixed fraction in a fractionating system of the diesel refining device to obtain light naphtha, high-aromatic latent heavy naphtha and the diesel fraction. By adopting the method disclosed by the invention, the hydrocracking device and the diesel refining device are combined to produce the chemical material; and the reaction pressure of the diesel refining device is low and middle pressure, and improvement of the aromatic latent of the heavy naphtha and reduction of hydrogen consumption are facilitated in the second hydrocracking process.

The present invention provides one kind of hydrocracking process with simultaneously raised medium oil selectivity and product quality. By means of laminated filling of type-Y molecular sieve catalyst and type-beta molecular sieve catalyst, that is, filling the type-Y molecular sieve catalyst in the lower part of the reactor and filling the type-beta molecular sieve catalyst in the upper part of the reactor, two different kinds of molecular sieve catalyst have their characteristics utilized fully in raising medium oil selectivity and product quality simultaneously.

The invention discloses a hydrocracking process for flexibly producing diesel oil. A wax oil raw material is subjected to hydrogenation pretreatment and then enters a hydrocracking reactor; the obtained hydrocracked material is divided into two streams; one stream enters a hot high-pressure separator to be separated to obtain a gas phase and a liquid phase; one hydrocracked material stream which does not enter the high-pressure separator is mixed with the gas phase separated by the hot high-pressure separator, and the mixture is subjected to gas-liquid separation and fractionation to obtain hydrocracked naphtha, aviation kerosene, diesel oil and tail oil; the liquid phase obtained through separation by the hot high-pressure separator is mixed with a part or all of the hydrocracking tail oil and then mixed with hydrogen, the mixture is subjected to a hydroisomerization cracking reaction, and an obtained hydroisomerization cracking material is subjected to gas-liquid separation and fractionation to obtain hydroisomerization cracked naphtha, aviation kerosene, diesel oil and tail oil. The invention provides, for the first time, the hydrocracking process for simultaneously producing more than two aviation kerosene, diesel oil and tail oil products with different specifications on one set of hydrogenation process equipment, particularly diesel oil products with different condensation points.