103 results about "Sulfur content" patented technology

The application discloses a high-purity stainless steel vacuum induction melting desulfurization method, which comprises the following steps: S1, preparing materials; S2, charging and melting; S3, refining; S4, deoxidizing and desulfurizing: after the refining is completed, deoxidizing alloy and desulfurizing agent are added into the molten steel, and after stirring for 5-10 minutes, argon is filled into the furnace until the pressure reaches 80-90 KPa, the temperature is controlled at 1580-1610 DEG C, and deoxidizing and desulfurizing are performed for 40-50 minutes; S5, secondary refining; and S6, pouring. The high-purity stainless steel vacuum induction melting desulfurization method provided by the application firstly pre-treats raw materials, then performs charging and melting, reduces the contact between molten steel and air through the vacuum induction melting method, improves the desulfurizing and deoxidizing efficiency, and through twice refining and adding specific desulfurizing agent, the sulfur content of the finally obtained high-purity stainless steel is less than 7 ppm, the effect of deep desulfurization is achieved, and the demand of the steel industry is met.

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.

The present invention provides line pipe steel comprising, by wt%, 0.04-0.07% of carbon (C), 0.20-0.30% of silicon (Si), 1.2-1.35% of manganese (Mn), 0.02-0.05% of aluminum (Al), 0.10% or less (excluding 0%) of copper (Cu), 0.15-0.25% of chromium (Cr), 0.02-0.08% of molybdenum (Mo), 0.15-0.25% of nickel (Ni), 0.04-0.05% of niobium (Nb), 0.01-0.018% of titanium (Ti), 0.025%-0.035% of vanadium (V), 0.01% or less (excluding 0%) of phosphorus (P), 0.001% or less (excluding 0%) of sulfur (S), 0.0005% or less (excluding 0%) of boron (B), and the balance of iron (Fe) and inevitable impurities, wherein the relative notch tensile strength (RNTS) according to ASTM G142 is 0.86 or greater.

The present application relates to the technical field of ore recovery, and particularly relates to a comprehensive recovery and utilization method of complex associated magnetite, which comprises a pretreatment stage, a sulfur tailing reinforced recovery and a desulfurization flotation operation. The magnetic roller separation device designed by the gradient magnetic field realizes effective separation of magnetic minerals and sulfur-containing minerals, and the two-stage wet magnetic separation equipment is used to improve the recovery rate of magnetic minerals, and then the sulfur content of the iron concentrate is reduced by optimizing the reagent adding mode and the flotation conditions. The present application can significantly reduce resource waste, reduce energy consumption and environmental pollution, and provides a green and efficient comprehensive recovery and utilization solution for complex associated magnetite.

This invention discloses a method for modifying high-sulfur petroleum coke. The method includes the following steps: mixing high-sulfur petroleum coke raw material with a treatment agent; performing solid-liquid separation after treatment; and washing and drying the separated solid material to obtain the product. The high-sulfur petroleum coke raw material can be further pretreated. This method can reduce the sulfur content of high-sulfur petroleum coke to below 3%, obtaining a qualified low-sulfur petroleum coke product, while simultaneously improving the performance of the petroleum coke product by more than one grade.

This invention provides a calcium carbonate compound and an inorganic molded body with shape controlled by having a high aspect ratio. The invention relates to a calcium carbonate compound having a phosphorus content of 1000 ppm or more and 15000 ppm or less, a sulfur content of 2000 ppm or less, and an aspect ratio (mean major axis to mean minor axis) of 6 or more and 19 or less.

This invention relates to the field of petrochemical catalytic desulfurization technology, specifically disclosing a high-efficiency desulfurizing agent, its preparation method, and its application in the desulfurization of heavy naphtha. The desulfurizing agent provided by this invention has a "two-level" metal active center. The first level is a cobalt center in biochar, and the second level is a nickel-copper bimetallic center introduced through impregnation on the surface of a composite carrier. The desulfurizing agent provided by this invention has excellent desulfurization effect. Under conditions of 140°C and no hydrogen, it can simultaneously remove inorganic sulfur such as hydrogen sulfide and organic sulfur such as thiols, thioethers, and thiophenes from heavy naphtha obtained by hydrocracking of heavy diesel oil, wax oil, or mixed diesel and wax oil, reducing the total sulfur content from 25-40 μg·g. ‑1 Reduced to 0.2 μg·g ‑1 The following methods can effectively protect bimetallic (multimetallic) reforming catalysts from sulfur poisoning, and the preparation process is green and controllable, making it suitable for large-scale industrial applications.

The present application relates to a kind of low sulfur high performance fuel oil production device, it relates to fuel oil production technical field.Low sulfur modified residual oil, hydrogenation low sulfur raffinate are used as main raw material, auxiliary agent A, auxiliary agent B prepared by special oil device are matched, reaction conditions are accurately controlled through DCS system, low sulfur high performance marine fuel oil is prepared in low temperature mild environment;Device integrates vacuum deep pull and viscosity reduction cracking combined process, light fraction can be deep-processed into three kinds of base oil, etc.Additional value products, heavy fraction is reduced in viscosity by viscosity reduction cracking, and low-temperature fluidity is improved;Auxiliary agent B is prepared by dithiophosphoric acid, molybdenum trioxide, epoxy succinic acid polymer, 2,6-naphthalene dicarboxylic acid, anhydrous toluene, phosphorous acid;Fuel oil prepared by the present application, sulfur content is lower, environmental protection is better, low-temperature fluidity is improved, and combustion efficiency is better.

The application provides a wine aging method, and belongs to the technical field of wine brewing, which comprises the following steps: adjusting the sulfur content of separated base wine to obtain base wine with adjusted sulfur content; sterilizing oak barrels by steam fumigation; filling the base wine with adjusted sulfur content into the sterilized oak barrels to obtain full oak barrels; aging the full oak barrels, the humidity of the aging environment is 65RH%-75RH%, and the temperature of the aging is adjusted according to the season, and the full oak barrels are regularly adjusted in sulfur content during the aging process. The wine aging method provided by the application can regularly adjust the sulfur content of the wine liquid once every 28 days during the aging process, accurately supplement the content of key components in the wine liquid which is reduced due to natural consumption, and avoid the concentration of the components being lower than the appropriate interval of aging.

The invention relates to the technical field of metallurgy and special steel refining, and discloses a high-purity duplex stainless steel alloy and a preparation process thereof, the alloy comprises 0.015%-0.030% of C, 22.0%-23.0% of Cr, 4.5%-6.5% of Ni, 3.0%-3.5% of Mo, 0.14%-0.20% of N, 0.3%-1.0% of Si, 0.8%-2.0% of Mn, less than or equal to 0.02% of P, and the balance Fe and inevitable impurities. In the refining process, a silicon-barium alloy wire is firstly fed after pre-deoxidation, and then a rare earth cerium-iron alloy wire and a nickel-magnesium slow-release alloy wire are synchronously fed, so that the synergistic effect of inclusion modification and in-situ microbubble flotation is achieved. According to the method, the impurity removal time is shortened, the temperature drop is reduced, the nitrogen preservation effect is improved, and the total oxygen content and the total sulfur content in the final casting blank are reduced.

This invention provides a method for manufacturing high-toughness and ultra-high-strength steel pipes, comprising the following steps: 1) electric arc furnace smelting; 2) ladle refining; 3) VD vacuum degassing; 4) continuous casting; 5) low-temperature annealing; 6) through-hole drilling; 7) heating; 8) skew rolling piercing; 9) periodic pipe rolling; 10) mist cooling; 11) normalizing + tempering; 12) internal and external grinding. This invention, through electric arc furnace smelting + ladle refining + VD vacuum degassing + continuous casting, not only meets the requirements for high-purity steel with low phosphorus and low sulfur content, but also has lower smelting costs than other processes. By using a round billet center mill to add through-holes, the amount of piercing deformation is reduced, metal flow conditions are optimized, and internal and external surface defects under complex stress conditions during piercing are improved. Based on the integrated deformation of forging, rolling, and extrusion, four processes—forging and rolling, precision rolling, sizing, and pipe removal—are realized, which not only refines the product grains and makes the longitudinal and transverse properties uniform, but also improves the geometric dimensional accuracy and internal and external surface quality of the steel pipe.

This invention discloses a method for refined control of the cold end temperature of an air preheater in a thermal power plant boiler. During unit operation, when the sulfur content of the coal fed into the boiler flue gas flues, the real-time variation range of SO2 concentration in the flue gas generated by boiler combustion is divided into interval steps. The acid dew point temperature at the corresponding concentration is calculated. Through improved logic module configuration, the acid dew point temperature value corresponding to the upper limit of the SO2 concentration variation range is sent to the boiler air heater control system. This value is used as the control target value for the cold end temperature of the air preheater. The air heater control system automatically tracks and adjusts to ensure that the cold end temperature of the air preheater is never lower than the acid dew point temperature. This prevents sulfuric acid condensation in the flue gas from corroding and clogging the cold end of the air preheater when the flue gas temperature is below the acid dew point temperature, ensuring safe equipment operation, improving the economic efficiency of equipment operation, and further reducing coal consumption.

This invention discloses a method for smelting high-purity nitrogen- and sulfur-containing steel, comprising the following steps: (1) Converter smelting: Before smelting, desulfurized slag is added to the converter along with scrap steel, followed by undesulfurized molten iron, and then smelting is carried out in the converter. The final smelting concentration S is controlled to be ≥0.040%, and nitrogen is blown into the ladle during the converter tapping process; (2) LF furnace refining: Ferrosilicon powder is used to deoxidize the slag during the LF furnace refining process, and lime and refining synthetic slag are used to control the low-alkalinity slag system. Nitrogen is blown into the ladle; (3) RH vacuum treatment: Circulating nitrogen gas is used. Vacuum treatment is a combination of basic treatment and light treatment mode. Sulfur line is used to finely adjust the sulfur content of the finished product in the early stage of soft blowing. No calcium line is added. The soft blowing time is 15-20 minutes, and nitrogen is blown into the bottom; (4) Continuous casting: A porous argon-blowing plug and a side-opening nozzle are used in the casting ladle. The smelting method of this invention effectively improves the purity of molten steel while increasing sulfur and nitrogen content.

This invention discloses an automatic desulfurization control method and related equipment based on real-time monitoring of the sulfur content of coal fed into the furnace, belonging to the field of automatic desulfurization control technology. The method includes: calculating the actual calorific value of the coal fed into the furnace based on real-time operating parameters; determining the real-time sulfur content of the coal fed into the furnace; obtaining the number of currently operating slurry circulation pumps; calculating a basic pH value based on a fitting model of the real-time sulfur content of the coal fed into the furnace, the setpoint of sulfur dioxide at the outlet, and the target pH value corresponding to the number of operating pumps; correcting the basic pH value based on the deviation between the actual value of sulfur dioxide at the outlet and the setpoint of sulfur dioxide at the outlet to obtain the target pH value; and adjusting the slurry supply flow rate of limestone slurry according to the target pH value to ensure that the pH value of the slurry in the absorption tower reaches the target pH value. This invention avoids excessive sulfur dioxide at the outlet due to adjustment lag and prevents a decrease in desulfurization efficiency due to excessively high pH values, while achieving precise control and economical and energy-saving operation of the desulfurization system.

The utility model belongs to alkylated oil desulfurization technical field especially relates to a rectifying assembly for rectifying column, including rectifying column, support, the support is installed in the outer surface of rectifying column, the rectifying column outside is provided with tower top backflow mechanism, the feed inlet of rectifying column is linked together with the bottom of de -n butane column, is used for receiving the fractionating oil of de -n butane column bottom. The rectifying assembly for rectifying column, by setting rectifying column body, tower top backflow structure, can be in the top of rectifying column and distill the low sulfur content product alkylated oil of more than 95% of de -n butane column bottom fraction, only need to handle the distillate of 5% or so rectifying column tower bottom, greatly reduced the processing capacity, is favorable to the smooth operation of alkylated device, and the influence of other index to alkylated oil is little, simultaneously, when the sulfur content of fractionating oil is low, can stop rectifying column operation, realized energy -conserving.

This invention discloses a liquefied petroleum gas (LPG) hydrotreating process for olefin removal and desulfurization. The feedstock consists of one or more types of LPG derived from refinery catalytic cracking, coking, or other units, as well as light hydrocarbons derived from oil and gas fields. After removing hydrogen sulfide from the LPG in a desulfurization tower, the feedstock is pressurized by a feed pump, mixed with hydrogen, and then heated and vaporized in a heat exchanger and furnace. It then enters a hydrorefining reactor for olefin saturation, removal of mercaptans and other impurities, and then enters a desulfurization reactor to remove hydrogen sulfide generated during the hydrotreating reaction. The refined desulfurized LPG is then cooled by heat exchange and enters a low-pressure separator. The refined LPG after gas-liquid separation is sent to a LPG separation unit. This process yields refined LPG products with low olefin and low sulfur content.

Provided herein are methods and systems for producing carbon-free hydrogen. The method includes introducing a hydrogen sulfide (H2S)-bearing fluid stream into an iron-rich subsurface reservoir predominantly containing one or more types of reactive ferric iron-rich minerals, and contacting the H2S-bearing fluid stream with the one or more types of reactive ferric iron-rich minerals present in the iron-rich subsurface reservoir, thereby generating a sweet fluid stream having a reduced-sulfur content as compared to the H2S-bearing fluid stream and an iron scale deposited within the iron-rich subsurface reservoir and forming a hydrogen gas cap in an upper portion of the iron-rich subsurface reservoir beneath a cap rock seal.

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 relates to the field of iron and steel metallurgy, particularly to a steel for track links in engineering machinery and its manufacturing process. The steel contains C, Si, Mn, Ca, Cr, Al, Ti, Nb, B, Mo, and N. The production process includes electric furnace smelting, LF ladle refining, RH vacuum treatment, continuous casting, heating, rolling, and cooling. Based on 15B36Cr steel, this invention increases the Cr content to 1.00%–1.20% to improve its wear resistance and increase the hardenability of the core of large-size track links. It also incorporates 0.020%–0.035% Nb to form a “B-Nb-Ti-Al” synergistic microalloying system. Simultaneously, it optimizes inclusion control by controlling Ca and sulfur content to ensure a calcium-sulfur ratio ≥1.5, thereby enhancing the steel's corrosion resistance and avoiding or reducing the risk of fracture.

Provided is sulfonic acid-modified colloidal silica capable of forming a polished surface with highly reduced surface roughness.　This sulfonic acid-modified colloidal silica is characterized in that: the sulfur content of silica particles is 3000-9000 ppm by mass per 1 g of the silica particles; the sulfur content in a solvent is 750 ppm by mass or less per 1 g of the solvent; and the content of coarse particles with a particle size of 0.2 μm or more included in the silica particles is 10,000,000 particles or less per 1 mL when the silica particle concentration is 1 mass%.

A sulfur trap system is provided for protecting methane oxidation catalysts (MOC) from sulfur poisoning in sulfur-containing exhaust. The trap is positioned upstream of the MOC and includes a washcoat comprising zeolite, cerium-based oxygen-storage material, and alumina, and an overcoat containing copper, manganese, and cerium oxides. The mixed metal oxide and support formulation delivers high sulfur adsorption at engine exhaust temperatures, reducing sulfur to safe levels and extending the operational life and methane conversion performance of downstream palladium-based MOC systems.

The present invention provides sulfonic acid-modified colloidal silica capable of forming a highly flat polished surface at high speed, even when used for polishing semiconductor wafers coated with a silicon nitride film. [Solution] A sulfonic acid-modified colloidal silica characterized in that the sulfur content of the silica particles is 700 ppm by mass or more and less than 3000 ppm by mass per gram of silica particles, the sulfur content of the solvent is 250 ppm by mass or less per gram of solvent, and the average secondary particle diameter of the silica particles is 5 nm or more and 43 nm or less.

This invention belongs to the field of mineral processing technology. Specifically, it discloses a graded magnetic separation process for sulfur-containing magnetite. By classifying the ore and dynamically adjusting the magnetic field strength according to the characteristics of different particle sizes, the orientation of iron and sulfur minerals is precisely controlled, achieving optimized adjustment of element orientation. This promotes efficient separation of sulfur and magnetite, improves the grade of iron concentrate, reduces sulfur content, and simultaneously reduces iron mineral loss, thereby increasing the resource utilization rate of both iron and sulfur. The process design of this invention is scientifically sound, with controllable operating costs, high resource utilization, and significant environmental benefits, providing a practical solution for the efficient and clean utilization of sulfur-containing magnetite.

A process for removing sulfur from a sulfur-containing solid carbon-based material includes adding a sulfur-containing solid carbon-based material to an aqueous electrolyte solution comprising an effective amount of an electrolyte in an electrochemical cell, and subjecting the aqueous electrolyte solution to an effective voltage and current to at least partially oxidize at least a portion of sulfur in the sulfur-containing solid carbon-based material, thereby generating oxidized sulfur and a reduced sulfur-containing solid carbon-based material. The reduced sulfur-containing solid carbon-based material has a lower sulfur content by wt. % than the sulfur-containing solid carbon-based material.

The application discloses a method for converting sulfur-containing naphtha. The method comprises the following steps: mixing the sulfur-containing naphtha with hydrogen, and then passing the mixture through a hydroconversion reaction zone; and separating a reaction product to obtain hydrogen-rich gas and a hydroconversion product, wherein the sulfur content in the hydroconversion product is 50-200 mg / kg, and the hydroconversion reaction zone is filled with at least two hydroconversion catalyst beds, and the active metal content in the catalysts decreases in sequence along the flow direction. The hydroconversion product containing a certain amount of hydrogen sulfide is used as ethylene raw material, so that the problem of sulfur injection in an ethylene production device can be solved.

The present application belongs to the technical field of propylene desulfurization, and particularly relates to a high-temperature-resistant sulfur-reducing additive and a method for reducing and upgrading the sulfur content of coking propylene by using the sulfur-reducing additive. The high-temperature-resistant sulfur-reducing additive comprises acidified kaolin, ammonium metavanadate, zinc oxide, nickel oxide, REY molecular sieve and USY molecular sieve as effective components. The method for reducing and upgrading the sulfur content of coking propylene relies on the mature catalytic cracking process to reduce the sulfur content of coking propylene. By compounding the high-temperature-resistant sulfur-reducing additive with the catalytic cracking catalyst, carbonyl sulfur can be transferred to hydrogen sulfide under the condition that the state of propylene remains unchanged. The hydrogen sulfide can be absorbed by lean amine liquid, so as to achieve the purpose of reducing and upgrading the sulfur content of coking propylene.

The application provides a coal power adjustable capacity prediction method. The method comprises the following steps: establishing a prediction scene set of typical power coal variety prices to obtain predicted prices of the typical power coal varieties; establishing an objective function of minimizing the coal blending and burning power generation cost, and establishing a coal blending optimization model according to the power coal consumption constraint, the boiler calorific value, the boiler ash content and the boiler sulfur content constraint, solving the coal blending optimization model to obtain an optimal coal blending strategy; establishing a linear regression model of the blocked capacity of the coal power unit during the peak output period and the power coal quality according to the historical data of the adjustable capacity and the power coal quality of the coal power unit in the power system during the peak output period; predicting the corresponding blocked capacity through the linear regression model; calculating the coal power adjustable capacity of each coal power unit in the power system to obtain the adjustable capacity coefficient of the power system, and evaluating the coal power generation capacity according to the adjustable capacity coefficient.

The present application provides a demercaptan agent consisting of: (1) at least one aminocarboxylate salt containing a primary amine group, a secondary amine group or a tertiary amine group, (2) at least one alcohol amine being a primary alcohol amine, a secondary alcohol amine or a tertiary alcohol amine, and (3) water. The present application also provides a preparation method and use of the demercaptan agent and a method for removing mercaptans from liquefied petroleum gas using the demercaptan agent. The demercaptan agent of the present application removes mercaptans by extraction without using inorganic bases such as sodium hydroxide, and the regenerated demercaptan agent can be regenerated by steam stripping, recycled and used, and no alkali residue is discharged. The demercaptan agent of the present application can be used for removing mercaptans from liquefied petroleum gas, and the total sulfur content of refined liquefied petroleum gas can be reduced to 5 μg·g ‑1 The following.