22 results about "Hydrodesulfurization" patented technology

This invention belongs to the field of petroleum processing technology, and specifically relates to a production apparatus and method for low-pour-point base oil for aviation hydraulic oil. The production apparatus and method for low-pour-point base oil for aviation hydraulic oil includes the following steps: Hydrorefining of the oil, where the feedstock oil undergoes hydrodesulfurization and dearomatization in a two-stage series process to produce hydrorefined oil with <1% aromatics and <1 mg / kg sulfur content; Fine fractionation of the oil, specifically: the hydrorefined oil is finely fractionated in a fractionation tower to obtain hydrorefined distillate oil at 230℃~280℃; Molecular sieve dewaxing, specifically: the 230℃~280℃ hydrorefined distillate oil is subjected to deep removal of n-alkanes using a 5A molecular sieve, lowering the oil's pour point to below -75℃, producing low-pour-point, low-aromatic aviation hydraulic oil base oil. This invention uses a combined process of "low-pressure hydrorefining-molecular sieve dewaxing" to produce a low-sulfur, low-aromatic, low-pour-point base oil with less than 1% aromatics. The production method has the advantages of low investment and ease of implementation.

A method can be employed to regulate and stably operate a steam reforming system that is operated by steam reforming, that has a capacity utilization level that can be regulated, and that comprises a steam reformer, a hydrogenating and desulfurizing unit that is positioned upstream of the steam reformer and is configured for feedstock desulfurization, and a firing unit of the steam reformer. According to the method, a mandated capacity utilization level for the steam reforming system is established with automated regulation of the following continuously monitored parameter ratios: a hydrogen-to-feedstock ratio in the hydrogenating and desulfurizing unit, a steam-to-carbon ratio in the steam reformer, and a fuel-to-air ratio in the firing unit of the steam reformer.

The utility model provides a kind of extruder device for diesel hydrogen desulfurization catalyst production, it belongs to extruder technical field, it includes fixed shell and cylinder, the fixed shell side is connected with cylinder and penetrates, the output end of two cylinder is fixedly connected with transmission plug, the other side of the fixed shell is connected with communicating hole and penetrates, the top of the fixed shell is fixedly connected with support frame, the top of the support frame is fixedly connected with receiving hopper, the bottom of the receiving hopper is connected with conveying pipe and penetrates, the outer surface of the conveying pipe is connected with electric throttle valve and penetrates.The utility model adds control screen and electric heating tube to fixed shell, control screen is delivered to the inside of electric heating tube, when electric heating tube inside resistance wire via electric heating effect, heat is continuously delivered to the inside of fixed shell to heat catalyst, prevent catalyst freezing and affect catalyst extrusion effect.

This application discloses a gas diffusion layer-free fuel cell based on a carbon-based porous support and its preparation method. The core of this fuel cell is the carbon-based porous support, prepared by co-pyrolysis of coal or biomass with enzymatically hydrolyzed lignin. Pretreatment using nickel-catalyzed hydrodesulfurization reduces the residual sulfur content in the support to <10 ppb, eliminating the risk of sulfur poisoning of the precious metal catalyst. A solvent-circulating vacuum-pressure impregnation method is used to embed precious metal nanoparticles into the pores of the support, achieving physical confinement and chemical anchoring. The catalyst is directly coated onto the surface of the bipolar plate flow channel to form an integrated electrode, replacing the traditional gas diffusion layer. This fuel cell eliminates the need for a gas diffusion layer (GDL), reduces contact resistance and cost, improves catalyst durability, enhances water management, and solves the technical challenge of sulfur poisoning of precious metals with low-cost carbon supports. It provides a new pathway for the large-scale application of high-performance, long-life, and low-cost fuel cells.

A method for producing marine fuel oil includes: 1) reacting feedstock oil with a catalytic conversion catalyst in a catalytic conversion reactor to obtain a reaction product containing polycyclic aromatic hydrocarbons (PAHs) comprising 8-25 wt% propylene and 15-50 wt% of the feedstock oil, with an initial boiling point volumetric distillation temperature of not less than 250°C; 2) hydrodesulfurizing the PAH-containing catalytic cracking distillate oil to obtain a low-sulfur hydrotreated distillate oil, wherein the sulfur content of the low-sulfur hydrotreated distillate oil is not greater than 0.1%; and 3) blending the low-sulfur hydrotreated distillate oil as a low-sulfur marine fuel oil component with vacuum residue to obtain marine fuel oil. The method of this invention can produce a large quantity of fuel oil components, resulting in significant economic and social benefits.

This invention belongs to the field of catalytic chemical technology and discloses a method for preparing a Ni2P / SAPO-11 catalyst and its application. Ni(NO3)2·6H2O and (NH4)2HPO4 are dissolved in deionized water to obtain a mixed solution A. Citric acid is dissolved in mixed solution A and ultrasonically treated until completely dissolved to obtain an impregnation solution B. Impregnation solution B is added dropwise to a SAPO-11 support, and after aging, drying, and calcination, a catalyst precursor is obtained. The precursor is reduced under a hydrogen atmosphere to prepare the active phase, thus obtaining a CA-modified CA(x)-Ni2P / SAPO-11 catalyst, where x is the CA / Ni molar ratio. This invention, by regulating the metal-acid active center balance with citric acid, promotes the synergistic effect of bifunctional active centers, significantly improving the catalyst's ability to simultaneously perform hydrodesulfurization and hydroxyl skeletal isomerization. This invention provides a new method for preparing bifunctional catalysts with deep desulfurization and olefin skeletal isomerization activities.

The present application relates to a kind of hydrodesulfurization catalyst and its preparation method and application, it is related to the field of hydrodesulfurization catalyst, the catalyst includes carrier and active metal component supported on the carrier, the carrier is nanoflower spherical catalyst carrier f-TiO2@BNO.Compared with prior art the present application provides a kind of high activity hydrodesulfurization catalyst, with f-TiO2@BNO as catalyst carrier, with highly exposed surface, there is strong interaction between active metal, it is favorable to the load of active metal, can give full play to the catalytic activity of active metal and ensure its catalytic stability;And can prevent H2S adsorption, promote hydrogenation reaction to proceed;Using the hydrodesulfurization catalyst of the present application, can under the condition of low temperature (<300 ℃), normal pressure, low hydrogen concentration (1%~3%), to the sulfur component such as methyl mercaptan, carbonyl sulfur in natural gas, carry out rapid hydrodesulfurization, conversion rate reaches more than 90%, and catalyst need not be presulfurized treatment.

The present invention relates to a process for the hydrodesulfurization of a sulfur-containing olefinic gasoline fraction, comprising contacting the gasoline fraction, hydrogen, and an alumina support obtained by dehydrating aluminum hydroxide or aluminum oxyhydroxide at a temperature between 400°C and 1200°C for a time between 0.1 and 5 seconds, with a catalyst comprising at least one metal from group VIB, at least one metal from group VIII, and phosphorus, the molar ratio between phosphorus and the metal of group VIB being between 0.2 and 0.35.

This invention relates to the chemical industry and discloses a method for hydrodesulfurization and denitrification of high-nitrogen jet fuel. The method includes the following steps: (1) in the presence of hydrogen, the jet fuel raw material undergoes a gas-phase desulfurization reaction in a first hydrotreating reactor to obtain a gas-phase desulfurization reaction product; (2) the gas-phase desulfurization reaction product is subjected to gas-liquid separation to obtain a gas phase component and a liquid phase component; (3) the liquid phase component is pressurized and then subjected to a liquid-phase denitrification reaction in a second hydrotreating reactor to obtain a liquid-phase denitrification reaction product; wherein the nitrogen content in the jet fuel raw material is ≥10 μg / g. This method allows for the production of qualified jet fuel products under more moderate process conditions using high-nitrogen jet fuel as raw material, while also improving chemical reaction efficiency and reducing energy and hydrogen consumption.

This invention discloses a liquefied petroleum gas (LPG) hydrodeolefins desulfurization process, characterized by the following steps: incoming LPG is pressurized and mixed with hydrogen, then heated and vaporized before entering a hydrorefining reactor; the hydrorefining reaction gas from step 1) enters a low-pressure separator after heat exchange and cooling; low-density gas generated at the top of the low-pressure separator is pressurized and mixed with fresh hydrogen from outside the unit to form mixed hydrogen; the hydrorefined LPG at the bottom of the low-pressure separator is pressurized and sent to an LPG desulfurization tower; in the LPG desulfurization tower, LPG and amine solution are contacted counter-currently to remove most of the hydrogen sulfide from the reaction gas, and the LPG exiting from the top of the tower enters a fine desulfurization tank; after the fine desulfurization tank uses a desulfurizing agent to adsorb and remove residual hydrogen sulfide from the LPG, the refined LPG is sent to a LPG separation unit.

A method for producing propylene and low-sulfur fuel oil components comprises the steps of: contacting a heavy feedstock oil with a solvent for extractive separation to obtain deasphalted oil and de-asphalt; contacting the deasphalted oil and optionally a light feedstock oil with a catalytic conversion catalyst for reaction in the absence of hydrogen to obtain a reaction product containing propylene; separating the reaction product to obtain catalytic cracking distillate, and hydrodesulfurizing the catalytic cracking distillate to obtain a low-sulfur hydrodistillate, wherein the low-sulfur hydrodistillate and / or de-asphalt is suitable for use as a fuel oil component. This process enables the conversion of saturated hydrocarbons in the heavy feedstock into propylene and eliminates the use of saturated hydrocarbons in the fuel oil component, thereby providing better economic and social advantages.

The invention relates to the production of hydrogen (5) from a first feed stream (1) containing hydrogen sulfide and ammonia, comprising: (a) oxidizing a portion of the hydrogen sulfide content of the first feed stream (1) in a flame zone in a Claus furnace (C) to form sulfur dioxide, and reacting the hydrogen sulfide and sulfur dioxide in the furnace (C) and in downstream catalytic reactors (K) to form sulfur; (b) introducing pure oxygen or oxygen-enriched air as a second feed stream (2) into the Claus furnace (C) to achieve temperatures in the range of 1300°C - 1500°C, and to provide conditions for high levels of hydrogen sulfide dissociation into hydrogen and sulfur; (c) controlling the Claus furnace temperature so as not to cause refractory damage; (d) quenching the Claus reaction furnace off-gas (7) upstream of the catalytic reactors (K) to a temperature of less than 150°C in less than 6 milliseconds; (e) extracting sulfur from the gas downstream of the quench and downstream of the catalytic reactors (K); (f) hydroprocessing the sulfur-lean gas (8) in a hydrodesulfurization unit (H) to form a hydroprocessed gas (9), and (g) separating hydrogen (5) from the hydroprocessed gas (9).

The application provides a ZSM-5 mesoporous molecular sieve, a preparation method of the ZSM-5 mesoporous molecular sieve, a hydrorefining catalyst and application of the hydrorefining catalyst. The preparation method of the molecular sieve comprises the following steps: (1) mixing a first mixed solution and a second mixed solution, stirring, and then sequentially performing low-temperature heat treatment, high-temperature heat treatment, first washing and first drying to obtain an intermediate product powder; (2) mixing an acid solution and the intermediate product powder, performing acid immersion treatment, second washing and second drying to obtain the mesoporous molecular sieve. The mesoporous molecular sieve has a large mesopore pore volume and a specific surface area, the active component is highly dispersed, the hydrorefining activity is significantly improved, the metal macromolecular complex is efficiently captured, and the metal removal efficiency is improved; in addition, the hydrorefining catalyst can realize efficient hydrodesulfurization, hydrodenitrification and metal removal of heavy distillate oil such as vacuum residue, unconverted oil and heavy oil, the content of impurities such as sulfur, nitrogen and metal in the heavy distillate oil is reduced through the hydrorefining reaction, and the industrialized preparation demand of high-quality low-sulfur coke is met.

This invention discloses a method for preparing a slurry hydrodesulfurization catalyst, comprising the following steps: impregnating a hydrodesulfurization catalyst support with an impregnation solution containing Mo and Co; loading the impregnated support into a fixed-bed reactor and performing dry sulfidation to obtain the finished sulfidated catalyst; wherein the dry sulfidation process is as follows: after the hydrogen gas is gastight and a hydrogen circulation is established, the temperature is raised from room temperature to 350-550℃ and held at that temperature for 2-6 hours, wherein a certain H2S concentration is maintained in the circulating hydrogen after 230℃. The catalyst prepared by this method has high direct desulfurization activity, weakens the saturation performance of tricyclic and tetracyclic aromatic hydrocarbons, and is suitable for catalytic selective hydrodesulfurization reactions of slurry oil.

An adsorbent is in a liquid-phase hydrogenation catalyst composition. A catalyst bed containing the liquid-phase hydrogenation catalyst composition may be applicable in adsorption technology or oil liquid-phase hydrogenation technology. The adsorbent contains a porous material and a hydrogenation active metal supported on the porous material. The adsorbent has an average pore diameter of 2-15 nm, a specific surface area of 200-500 m2 / g, and the hydrogenation active metal is present in an amount, calculated as metal oxide, of 2.5 wt % or less, based on the total weight of the adsorbent. The adsorbent has a high hydrogen sulfide adsorption efficiency for a long period of time, and can effectively prolong the protection period for the hydrodesulfurization catalyst.

This invention discloses a high-loading hydrodesulfurization catalyst, its preparation method, and its application, belonging to the field of fuel oil desulfurization technology. Existing hydrodesulfurization catalysts suffer from problems such as poor active phase dispersion, poor sulfur and nitrogen resistance, and complex preparation processes. The hydrodesulfurization catalyst of this invention comprises 20-50 wt% active components (Ni, Co, Cu, W, and Mo), 2-20 wt% additives (P, Zn, Ce, Mn, and Ti), and a composite support (a mixture of various materials including alumina, boehmite, kaolin, montmorillonite, diatomaceous earth, bentonite, expanded perlite, silica sol, and illite-montmorillonite mixed-layer clay). This invention achieves efficient loading and high dispersion of the active components through the use of a specific dual-complexing agent system for synergistic effects. When applied to the hydrodesulfurization of heavy fuel oil, this catalyst achieves a desulfurization rate of over 98% for recalcitrant sulfides and exhibits excellent hydrotreating activity, selectivity, resistance to carbon deposition and sintering, and long-term operational stability.

The application discloses a production method of vehicle gasoline. The method comprises the following steps: firstly, raw oil and hydrogen enter a reactor I to carry out gas phase reaction; the effluent of the reactor I is partially or totally changed into liquid phase state by pressurization, and then is subjected to liquid phase reaction in a reaction container II, so as to obtain vehicle gasoline. The application adopts a hydrogen desulfurization route, combines the vaporization process and liquefaction process of the raw oil and hydrogen, strengthens the uniform mixing and dissolution of hydrogen and raw oil by using phase change process, realizes the partition reaction of sulfides, olefins and aromatic hydrocarbons in the raw oil, strengthens the reaction efficiency and improves the product quality.

For hydrodesulfurization of an olefinic gasoline cut containing sulfur, the gasoline cut, hydrogen, and a catalyst are brought into contact. The catalyst comprises a group VIB metal, a group VIII metal, and a mesoporous and macroporous alumina substrate having a bimodal mesopore distribution. The volume of mesopores having a diameter greater than or equal to 2 nm and less than 18 nm corresponds to between 10 and 30% by volume of the total pore volume of the substrate. The volume of mesopores having a diameter greater than or equal to 18 nm and less than 50 nm corresponds to between 30 and 50% by volume of the total pore volume of the substrate. The volume of macropores having a diameter greater than or equal to 50 nm and less than 8000 nm corresponds to between 30 and 50% by volume of the total pore volume of the substrate.

The application provides a hydrodesulfurization device for naphtha processing, and relates to the technical field of naphtha desulfurization.The device comprises a desulfurization tank, an oil inlet pipe and a gas outlet pipe are arranged on the desulfurization tank, a mixing device is arranged in the desulfurization tank, a circulating pump is arranged on the desulfurization tank, a lower oil suction pipe and an upper oil outlet pipe are connected to the circulating pump, the lower oil suction pipe and the upper oil outlet pipe extend into the desulfurization tank, a jet disc is arranged at the other end of the upper oil outlet pipe, a gas conveying pump is further arranged on the desulfurization tank, a gas conveying pipe is connected to the gas conveying pump, and the gas conveying pipe extends into the desulfurization tank. Hydrogen is introduced into the desulfurization tank through the gas conveying structure, and the mixing device in the tank is used to make the hydrogen and the naphtha fully mix, thereby effectively improving the poor gas-liquid mass transfer effect of the traditional device. Meanwhile, the circulating pump conveys the oil in the tank to the jet disc to be sprayed out, the oil flows from top to bottom, and forms reverse contact with the upward diffused hydrogen, thereby further strengthening the mass transfer and reaction effect. The utilization rate of raw materials is improved, and the production and operation cost of the device is reduced.

This invention discloses a catalyst for the hydrotreating of residual oil and its preparation method, belonging to the field of catalytic materials technology. The preparation method includes: S1. Mixing dolomite, cerium carbonate, zirconium oxide precursors with a silica precursor, followed by drying and calcination to obtain a composite support. In-situ pore-forming is achieved using the gas generated from the decomposition of dolomite and cerium carbonate, forming a mesoporous structure; S2. Impregnating the composite support in a modification solution containing chitosan and mannouronic acid, and constructing a cross-linked network coating on its surface via a Schiff base reaction to obtain a modified support; S3. Impregnating the modified support in a precursor solution containing nickel, molybdenum, and sulfur sources, followed by adsorption, drying, and calcination to obtain the catalyst. This invention achieves high dispersion and stable loading of active metal components while obtaining a high-porosity support with suitable pore distribution through the synergistic effect of pore structure regulation and surface modification. The catalyst exhibits excellent hydrodesulfurization, denitrification, and demetallization performance in the hydrotreating of residual oil.

This invention belongs to the field of petrochemicals, specifically relating to a method for preparing a Pt-doped Ni2P / Al2O3 hydrodesulfurization catalyst. The steps are as follows: aluminum isopropoxide is added to ethanol, and concentrated HNO3 is added dropwise. After cooling to room temperature, P123 and ethanol are added, followed by drying and calcination to obtain support A. Impregnation experiments are conducted using support A to determine the amount of deionized water. Then, nickel nitrate and diammonium hydrogen phosphate are dissolved in deionized water, dried at room temperature, and then dried and calcined to obtain Ni2P / Al2O3. Impregnation experiments are conducted based on Ni2P / Al2O3 to determine the amount of dichloromethane. Finally, platinum acetylacetone is dissolved in dichloromethane, dried, and calcined to obtain the final catalyst. This invention is simple to operate and low in cost. By introducing the active phase Pt, the particle size of the active phase and the amount of L and Brønsted acids on the support surface are adjusted to improve the hydrodesulfurization activity, enabling ultra-deep hydrodesulfurization of oil products under low energy consumption conditions.