38results about How to "Reduce secondary cracking reactions" patented technology

The invention relates to a low-grade heavy oil catalytic conversion process for increasing the yield of low-carbon olefins and gasoline. The process comprises the following steps: (1) low-grade heavy oil, namely raw oil, enters a first reaction zone (zone I) of a two-section riser, so as to be subjected to catalytic cracking reaction, and generated oil and gas enter a fractionating tower; (2) a top outlet material of the fractionating tower is a mixture of dry gas, liquefied gas and gasoline, a middle-part outlet material of the fractionating tower is diesel oil, a lower-part outlet material of the fractionating tower is catalyzing wax oil, a bottom outlet material of the fractionating tower is oil slurry, the catalyzing wax oil and the diesel oil enter a second reaction zone (zone II) of the two-section riser together, and the oil slurry enters a vacuum distillation tower; (3) a lower-carbon-residue light-distillate material of an upper-part outlet of the vacuum distillation tower and a higher-carbon-residue heavy-distillate material of a middle-part outlet of the vacuum distillation tower enter a hydrogenation device together, and ultrahigh-carbon-residue oil slurry at the bottom of the vacuum distillation tower enters a delayed coking device; (4) a low-carbon-residue easily-cracked material from the hydrogenation device enters the zone I of the riser and is subjected to reaction again. The process has the characteristics that the service life of the catalyst is prolonged, the yield of dry gases and coke is lowered, and meanwhile, the yield of low-carbon olefins and gasoline is increased.

The invention discloses a hydrocracking method, which includes the following contents: (1) Diesel feedstock is mixed with hydrogen and first enters a hydrorefining reactor for desulfurization, denitrogenation and aromatics saturation reaction; (2) Step (1) effluent enters Hydrocracking reactor, along the material direction, the hydrocracking reactor includes the 1st to nth catalyst beds, wherein n≥3, preferably n is 3 or 4, wherein, the 1st to n-1th catalyst beds are filled A hydrocracking catalyst containing a modified Y molecular sieve; the nth catalyst bed is filled with a hydroisomerization catalyst containing molecular sieves such as β or ZSM with strong isomerization performance. The method uses diesel oil as a raw material, increases the production of heavy naphtha with high aromatic potential, and improves the low-temperature fluidity of jet fuel and diesel products through a reasonable combination of hydrocracking catalysts with different functions.

The invention discloses a slurry-like organic solid waste pyrolysis device and method. The device comprises a casing, a feeding port is arranged on the top of the casing, and a heating roller is rotatably installed below the feeding port; There is a coke cleaner; the upper chain plate and the lower chain plate are arranged horizontally under the heating drum, and the output end of the upper chain plate corresponds to the input end of the lower chain plate; a row is installed between the upper chain plate and the lower chain plate Heating pipes arranged horizontally; an air outlet and a pyrolytic charcoal outlet are arranged on the casing, and the pyrolytic charcoal outlet is located at the bottom of the casing and corresponds to the output end of the lower chain plate. The above device is used to pyrolyze the slurry organic solid waste. The beneficial effect of the present invention is that the pulpy organic solid waste can be dehydrated, oil evaporated, and primary pyrolyzed to make the pulpy material into a solid state, and then undergo high-temperature pyrolysis through high-temperature heating of chain plates and heating pipes to realize pulpy waste. The high-efficiency pyrolysis of materials effectively solves the technical difficulties faced by conventional pyrolysis devices.

The invention discloses a one-stage serial hydrocracking method, which includes the following contents: (1) The raw material of wax oil is mixed with hydrogen and first enters a hydrorefining reactor for desulfurization, denitrogenation and aromatic hydrocarbon saturation reaction; (2) Step (1) The effluent enters the hydrocracking reactor, and the hydrocracking reactor includes the first to nth catalyst beds along the material direction, wherein n≥3, and each catalyst bed is filled with hydrocracking catalysts with different contents of modified Y molecular sieves; (3) The effluent from the hydrocracking reactor undergoes gas-liquid separation and liquid phase fractionation to obtain naphtha, jet fuel and diesel products. The method uses wax oil as a raw material, increases the production of heavy naphtha with high aromatic potential, and improves the quality of jet fuel and diesel products by setting a reasonable catalyst gradation mode and adjusting the catalyst composition and structure in the gradation bed layer.

The invention discloses a method for producing high-octane gasoline from raw materials containing aromatic hydrocarbons. The aromatics-containing raw material enters the hydrorefining reaction zone for hydrorefining reaction, and the resulting effluent enters the hydroconversion reactor from the middle of the reactor, where it undergoes gas-liquid separation; the resulting gas passes upward through the hydroconversion catalyst bed, and reacts The circulating oil entering from the top of the reactor is contacted to carry out hydroconversion reaction and saturated hydrogen dissolution; the separated liquid phase passes downward through the bed of hydrogenation transalkylation catalyst to eliminate the steric hindrance effect in condensed ring aromatics, and the obtained effluent One part is used as product and the other part is recycled back to the top of the hydroconversion reactor. The method of the invention can avoid the loss of gasoline octane number caused by excessive hydrogenation, obtain better blending components of diesel oil at the same time, can better reduce investment, and increase the processing capacity of the device.

The invention relates to a low-grade heavy oil catalytic conversion process for increasing the yield of low-carbon olefins and diesel oil. The process comprises the following steps: (1) preheated low-grade heavy oil, namely raw oil, enters a zone I of a riser and is in high-temperature short-contact-time high-agent-oil ratio contact with a catalytic cracking catalyst, so as to be subjected to catalytic cracking reaction, and generated oil and gas enter a fractionating tower; (2) a top outlet material of the fractionating tower is a mixture of dry gas, liquefied gas and gasoline, a middle-part outlet material of the fractionating tower is diesel oil, a lower-part outlet material of the fractionating tower is catalyzing wax oil which is relatively difficult to crack, a bottom outlet material of the fractionating tower is oil slurry, the catalyzing wax oil enters a zone II of the riser, and the oil slurry enters a vacuum distillation tower; (3) an upper-part outlet material of the vacuum distillation tower enters the zone II of the riser and is subjected to reaction again, a middle-part outlet material of the vacuum distillation tower enters a hydrogenation device for hydrogenation, and oil slurry at the bottom of the vacuum distillation tower is subjected to treatment by an oil slurry filter and then enters a delayed coking device; (4) a low-carbon-residue easily-cracked material from the hydrogenation device enters the zone I of the riser and is subjected to reaction again. The process has the characteristics that the service life of the catalyst is prolonged, the yield of dry gases and coke is lowered, and meanwhile, the yield of low-carbon olefins and diesel oil is increased.

The invention discloses a hydrocracking catalyst and a preparation method and application thereof. The method includes the following steps: (1) forming modified Y molecular sieve, amorphous silica-alumina and / or alumina, drying and calcining to obtain the catalyst carrier; the sodium content in the modified Y molecular sieve is 1 to 8 wt%; (2) the catalyst carrier prepared in step (1) by saturated impregnation with a non-polar organic solvent, and then dried to the non-polar catalyst carrier in the catalyst carrier The content of the organic solvent is 20-90% of the saturated adsorption capacity of the catalyst carrier. (3) The material obtained in step (2) is subjected to ammonium salt ion exchange, drying and calcination treatment; (4) active metal is introduced into the material obtained in step (3), and the final catalyst is obtained by drying and calcining. The catalyst prepared by the method can reduce the cracking of high value-added lubricating oil base oil to generate other low-value products, especially the excessive cracking of straight-chain paraffin high viscosity index components in the lubricating base oil.

The invention discloses a hydrocracking catalyst and a preparation method thereof. The hydrocracking catalyst comprises an acidic component, a hydrogenation metal component, an auxiliary agent and a carrier, and the acidic component is ammonium salt of a heteropolyacid. The preparation method of the hydrocracking catalyst includes preparing a catalyst precursor, modifying the precursor to prepare a carrier, and supporting acid components and hydrogenation metal components. The catalyst obtained by the method of the invention exhibits higher reactivity and liquid hydrocarbon selectivity when used in the hydrocracking reaction of long-chain alkanes.

The invention discloses an oil sludge treatment method. The treatment method comprises the following steps: oil sludge enters a drying unit for drying and dehydration, and after dehydration treatment, dewatered oil sludge and gas-phase materials are obtained; the dewatered oil sludge enters a pyrolysis reaction unit for pyrolysis reaction, and cracked gas is obtained after the reaction. , oil and coke; the gas-phase material obtains non-condensable gas and condensed water after heat exchange; the cracked gas and non-condensable gas enter the combustion unit, contact with the oxygen-containing atmosphere for combustion reaction, and use the hot flue gas generated by the reaction as the heat source as the drying unit And the pyrolysis reaction unit provides heating heat. The invention provides a sludge reduction, harmless and resourceful treatment method, which realizes the maximum reduction and resource utilization of sludge, and at the same time recovers high-value oil products without causing secondary pollution in the whole processing process.

The invention discloses a high-selectivity hydrocracking catalyst and a preparation method thereof, wherein the catalyst comprises an acidic component, a hydrogenation metal component, an auxiliary agent and a carrier, the acidic component is a heteropolyacid ammonium salt, the hydrogenation metal component is one or a plurality of materials selected from Group VIB metals and / or Group VIII metals,and P is an auxiliary agent. The preparation method comprises: preparing and modifying a catalyst precursor, and loading an acidic component. According to the present invention, the catalyst obtainedby the method exhibits good reactivity and high liquid-state hydrocarbon selectivity in the hydrocracking reactions of long-chain alkanes.

The invention relates to a closed type rough cyclone quick separation system carrying multiple-riser reactor for catalytic cracking process and a catalytic cracking method thereof. The reactor provided by the invention comprises risers, a stripping stage, a reacting-settler, rough cyclone separators disposed inside the reacting-settler and cyclone separators disposed on the top of the reacting-settler, wherein outlet ascension pipes of the rough cyclone separators are connected with inlets of the top cyclone separators through an oil gas collecting pipe. As a plurality of independent risers are arranged in the invention, feedstocks of different traits respectively undergo cracking reaction under each appropriate environment according to the requirements of device production schemes and product quality, so as to raise the yield of a target product. As a novel close type rough cyclone quick separation system is adopted on the outlets of the risers in the system, the staying time of cracked oil gas inside a settler is effectively shortened, the coke rate is reduced, and the yield of the target product is raised, therefore guaranteeing the device to operate safely for long periods of time.

The invention discloses a hydrocracking catalyst and a preparation method thereof. The hydrocracking catalyst includes an acidic component, a hydrogenation metal component, an auxiliary agent and a carrier. The acidic component is a heteropolyacid ammonium salt, a hydrogenation metal The components are one or more of Group VIB metals and / or Group VIII metals, P is an auxiliary agent, and the carrier is a composite carrier of alumina and silicon dioxide. A method for preparing the above hydrocracking catalyst is also provided. The catalyst obtained by the method of the invention exhibits higher reactivity and liquid hydrocarbon selectivity when used in the hydrocracking reaction of long-chain alkanes.

The invention discloses a method for producing high-octane gasoline from an aromatic hydrocarbon-containing raw material. The aromatic hydrocarbon-containing raw material enters a hydrofining reactionzone for a hydrofining reaction, an obtained effluent enters a hydro-conversion reactor from the middle of the reactor, and gas-liquid separation is carried out in the hydro-conversion reactor; the obtained gas passes upwards through a hydro-conversion catalyst bed to make contact with circulating oil entering from the top of the reactor so as to carry out hydro-conversion reaction and carry outsaturated hydrogen dissolution; a separated liquid phase passes downwards through a hydrogenation transalkylation catalyst bed to eliminate the steric hindrance effect in the polycyclic aromatic hydrocarbon, one part of the obtained effluent is used as a product, and the other part of the effluent is recycled back to the top of the hydro-conversion reactor. By the method, gasoline octane number loss caused by excessive hydrogenation can be avoided, meanwhile, good diesel oil blending components are obtained, investment can be better reduced, and the treatment capacity of the device is improved.