23 results about "Sulfur trioxide" patented technology

The invention is directed to a process for producing a sulfur trioxide-containing gas stream. A sulfur dioxide and oxygen containing gas are introduced in at least one converter stage to produce a sulfur trioxide-containing gas stream in a heterogeneous catalysation. In doing so a partial stream of a sulfur trioxide containing gas stream produced in the first or a subsequent converter stage is branched off as a recycling stream and recycled to be part of a feed gas of the first converter stage. It is essential that he sulfur dioxide containing gas and added oxygen are introduced as a motive medium in an ejector via an motive medium inlet such that it sucks in and accelerates the recycling stream through a sucking medium inlet as a sucking medium to produce a feed gas streaming through a discharge outlet for the converter stage at a set pressure range.

The application discloses a multi-stage fuming sulfuric acid absorption tower and a process method for absorbing sulfur trioxide by using the fuming sulfuric acid absorption tower. The multi-stage fuming sulfuric acid absorption tower comprises a primary absorption assembly and a secondary absorption assembly. The primary absorption assembly is provided with a first containing cavity. A first acid distributor is arranged in the first containing cavity and is arranged close to the upper wall surface of the first containing cavity and used for spraying acid liquid into the first containing cavity. The primary absorption assembly is provided with a flue gas inlet communicated with the first containing cavity. The secondary absorption assembly is arranged above the primary absorption assembly. The secondary absorption assembly is provided with a second containing cavity. The second containing cavity is communicated with the first containing cavity and used for receiving flue gas from the first containing cavity. A second acid distributor is arranged close to the upper wall surface of the second containing cavity and used for spraying acid liquid into the second containing cavity. The upper end of the secondary absorption assembly is provided with a flue gas outlet communicated with the second containing cavity. In this way, the sulfur trioxide absorption rate can be improved, and the product purity can be ensured.

The application discloses a method for resource utilization of desulfurization waste liquid, and relates to the technical field of chemical waste liquid treatment, and comprises the following steps: S1, filtering equipment is used to filter dilute sulfur foam liquid generated by a desulfurization system to obtain concentrated sulfur foam liquid and filtered clear liquid; S2, separation equipment is used to separate the concentrated sulfur foam liquid to obtain liquid sulfur and separated clear liquid; S3, evaporation concentration equipment is used to treat the separated clear liquid to obtain concentrated salt liquid, and non-condensable gas generated by the evaporation concentration equipment is transported into a coking coal gas negative pressure pipeline; S4, the liquid sulfur and part of the concentrated salt liquid are fed into solidification equipment to obtain salt-containing crude sulfur; and S5, the salt-containing crude sulfur and part of the concentrated salt liquid are fed into an incinerator to obtain sulfur dioxide-containing flue gas, and the sulfur dioxide-containing flue gas is used for producing concentrated sulfuric acid or liquid sulfur trioxide. The method can realize clean and efficient resource utilization of the desulfurization waste liquid.

Embodiments herein disclose a high-performance Vanadia-based catalyst designed for the efficient oxidation of sulfur dioxide (SO₂) to sulfur trioxide (SO₃) at significantly lower operating temperatures, with optimal performance around 400°C, a temperature lower than traditionally required by conventional catalysts. The catalyst consists of vanadium pentoxide (V₂O₅) as the active component, supported on naturally occurring uncalcined diatomaceous earth, combined with alkali metal promoters. A unique feature of the support material is the use of a mixture of relatively soft diatomaceous earth, exhibiting a percentage reduction of at least 35% in D50 particle size when measured by dry versus wet methods, alongside relatively hard diatomaceous earth to enhance mechanical strength. The catalyst demonstrates SO₂ conversion rates of 50-57% at 400°C and reaches a maximum of 80% at 410°C, surpassing benchmark catalysts that require higher temperatures (around 420°C) for similar conversions.

The present application belongs to the field of boron trifluoride production, and relates to a method for preparing boron trifluoride and its complex by continuous flow reaction. The method comprises the following steps: uniformly mixing boric acid with concentrated sulfuric acid, then adding oleum or continuously introducing sulfur trioxide gas to obtain an oleum solution of boric acid; introducing the obtained solution and anhydrous hydrogen fluoride gas into a continuous flow reactor at a uniform speed to obtain boron trifluoride gas; purifying and removing impurities from the boron trifluoride gas generated in the reaction; continuously introducing the purified boron trifluoride gas into a complexing solvent for a complexing reaction to obtain a boron trifluoride complex. The method uses a continuous flow reactor to react anhydrous hydrogen fluoride with the oleum solution of boric acid, so that the raw materials can be continuously and uniformly mixed, the reaction is rapid and complete, the process conditions are simplified, the sulfuric acid waste liquid can be recycled after treatment, and the method has economic advantages and process innovation, and is suitable for industrial production.

This invention belongs to the field of antitumor drugs, disclosing a sulfated Polygonatum sibiricum polysaccharide, its preparation method, and its application in the preparation of drugs for treating liver cancer. The invention uses dried Polygonatum sibiricum rhizome as raw material, purifies it to obtain Polygonatum sibiricum polysaccharide, and then uses a sulfur trioxide-pyridine complex as a sulfation reagent to perform sulfation modification, thus preparing sulfated Polygonatum sibiricum polysaccharide. Sulfated Polygonatum sibiricum polysaccharide significantly improves water solubility, optimizes molecular spatial conformation and charge distribution, and induces cancer cell apoptosis by damaging mitochondrial membrane potential, increasing intracellular ROS levels, and downregulating the expression of key phosphorylated proteins in the PI3K / Akt / mTOR signaling pathway. In animal experiments, it effectively inhibited tumor growth without causing significant systemic toxicity in mice, demonstrating good in vivo biocompatibility. Therefore, it has important application value.

A method for manufacturing phosphorus pentafluoride includes a dehydration step of dehydrating hexafluorophosphate hydrate using sulfuric acid containing less than 5% by mass of sulfur trioxide. Preferably, it also includes steps a) and b). a) a step of concentrating the sulfuric acid after the dehydration step. b) a step of reusing the sulfuric acid concentrated in step a) for the dehydration of hexafluorophosphate hydrate, and then using the sulfuric acid for the manufacture of phosphorus pentafluoride. Preferably, the dehydration step is carried out in the presence of hydrogen fluoride, and step c) is included before step a). c) a step of recovering the hydrogen fluoride after the dehydration step.

This disclosure provides a method and system for removing zinc from galvanized steel sheets, belonging to the field of resource recycling technology. The method includes: pickling and immersing the galvanized steel sheet in an inorganic acid to obtain a zinc salt solution and hydrogen gas; subjecting the zinc salt solution to multi-effect evaporation to obtain a concentrated solution and a condensate of the inorganic acid, the condensate of which is reused in the pickling process; calcining the concentrated solution to obtain solid oxides and tail gas containing hydrogen chloride or sulfur trioxide, the tail gas being reused in the pickling process; magnetically separating the solid oxides to obtain magnetic and non-magnetic oxides; and using the hydrogen gas generated from the pickling process to reduce the non-magnetic oxides, which are then collected by condensation to obtain zinc metal with a purity greater than 99%. This disclosure achieves closed-loop utilization of hydrochloric acid or sulfuric acid and water resources, with high zinc recovery rate, low energy consumption, and both economic and environmental benefits.

The application relates to the technical field of flue gas purification, and discloses an SCR denitration conversion integrated device and a smelting flue gas acid-making system. The SCR denitration conversion integrated device comprises an SCR denitration assembly which is used for removing nitrogen oxides in nitrous flue gas under the condition of 400 DEG C-450 DEG C to obtain first flue gas; and a conversion assembly which is connected with the SCR denitration device and is used for converting sulfur dioxide in the first flue gas into sulfur trioxide to obtain second flue gas. The SCR denitration conversion integrated device is simple in structure and greatly reduces the energy consumption of nitrous flue gas treatment.

The present application relates to a kind of phosphogypsum method and system of sulfuric acid.The method includes the following steps: (a) phosphogypsum and reducing agent are mixed granulation, and raw material particle is obtained;(b) raw material particle is treated by reduction, and after reduction material is obtained, after reduction material is treated by oxidation, and calcium oxide and flue gas are obtained;(c) flue gas is carried out gas-solid separation, after heat exchange of gas phase and oxygen-containing gas, preheated oxygen-containing gas and heat exchanged flue gas are obtained;(d) after heat exchanged flue gas is treated by impurity removal, sulfur dioxide in converted impurity-removed flue gas is converted into sulfur trioxide, and converted flue gas is obtained;(e) converted flue gas is absorbed by sulfuric acid with mass fraction of more than 98%, and sulfuric acid product and absorption tail gas are obtained;Wherein, preheated oxygen-containing gas is divided into two, and is respectively introduced into reduction process and oxidation process.The method of the present application can greatly reduce production cost, improve calcium sulfate decomposition rate, improve flue gas sulfur dioxide concentration and product quality.

In a method for preparing electronic-grade vinyl sulfate, a sulfur trioxide solution is prepared by dissolving sulfur trioxide with a solution A, an ethylene oxide solution is prepared by mixing a solution B with ethylene oxide, the sulfur trioxide solution and the ethylene oxide solution are pre-cooled, and introduced into a set of microchannel reactors for a real-time reaction to obtain a mixed solution containing crude vinyl sulfate, and then a post-treatment process is carried out to obtain crude vinyl sulfate. With the process, the reaction selectivity is good, and a microchannel reaction can accurately control the reaction energy level due to its rapid mixing and timely heat transfer, which greatly reduces the safety risk and effectively avoids the occurrence of side reactions. One-step synthesis is realized, the atomic economic benefits are significantly improved, and thus the process is a typical low-carbon green chemical reaction.

This invention discloses an alkali-free binary flooding surfactant, its preparation, and its application. The petroleum sulfonate surfactant disclosed in this invention is a sulfur trioxide sulfonate of a mixture of reduced-distillate oil, reduced-pentate oil, vacuum residue, and heavy alkylbenzene. The preparation process of the alkali-free binary flooding surfactant of this invention can employ batch sulfonation, requiring less equipment investment; the raw materials are reliable and inexpensive.

The invention is directed to a process for producing a sulfur trioxide-containing gas stream. A sulfur dioxide and oxygen containing gas are introduced in at least one converter stage to produce a sulfur trioxide-containing gas stream in a heterogeneous catalysation. In doing so a partial stream of a sulfur trioxide containing gas stream produced in the first or a subsequent converter stage is branched off as a recycling stream and recycled to be part of a feed gas of the first converter stage. It is essential that he sulfur dioxide containing gas and added oxygen are introduced as a motive medium in an ejector via an motive medium inlet such that it sucks in and accelerates the recycling stream through a sucking medium inlet as a sucking medium to produce a feed gas streaming through a discharge outlet for the converter stage at a set pressure range.

The present application belongs to the technical field of fine chemical intermediates, and particularly relates to a green process for continuously preparing 3-nitro-4-methyl benzene sulfonyl chloride. The present application discloses a method for continuously preparing 3-nitro-4-methyl benzene sulfonyl chloride, wherein o-nitrotoluene, sulfur trioxide I, polysulfide inhibitor and organic solvent I are mixed in a first static mixer, and then input into a first micro-reactor for reaction; a primary reaction mixture discharged from the first micro-reactor is mixed with chlorosulfonic acid, sulfur trioxide II, organic solvent II and sulfonyl chlorination promoter in a second static mixer, and the obtained mixture is input into a second micro-reactor for reaction; and a secondary reaction mixture discharged from the second micro-reactor is subjected to post-treatment to obtain 3-nitro-4-methyl benzene sulfonyl chloride.

This invention discloses a production apparatus and method for electronic-grade sulfuric acid. The invention utilizes an evaporator to evaporate gaseous sulfur trioxide from fuming sulfuric acid raw material. The evaporated sulfur trioxide gas enters a fuming acid scrubbing tower, using the fuming acid raw material as the scrubbing liquid to remove impurities such as metal ions, non-metal ions, and particulate matter carried in the sulfur trioxide gas. The scrubbed sulfur trioxide gas then enters a gas-liquid separator and a sulfur trioxide filter for further filtration. The purified sulfur trioxide gas then enters an electronic-grade sulfuric acid absorption tower to generate electronic-grade sulfuric acid. The electronic-grade sulfuric acid enters a degassing tower, where ultrapure air removes sulfur dioxide. The degassed electronic-grade sulfuric acid then enters an electronic-grade sulfuric acid filtration system for further filtration to obtain electronic-grade fuming sulfuric acid. This invention employs an evaporation-washing-filtration-absorption-degassing-filtration process to produce electronic-grade sulfuric acid, resulting in low overall equipment requirements, low energy consumption, and high product purity.

This invention relates to the field of catalytic materials, specifically to a vanadium-based catalyst for the conversion of sulfur dioxide to sulfur trioxide in waste acid cracking, its preparation method, and its application. The vanadium-based catalyst comprises an active phase supported on a carrier, the active phase including a main active component and a co-active component; the main active component is vanadium oxide; and the composite carrier is macroporous oxide-modified diatomaceous earth. The vanadium-based catalyst prepared by this invention exhibits excellent catalytic performance and compressive strength when used in waste acid cracking processes to catalyze the conversion of sulfur dioxide to sulfur trioxide.

This utility model discloses a tail gas desulfurization SO2 acid recovery device, including an annular plate. A conversion and saving mechanism is provided on the upper side of the base rib plate. The conversion and saving mechanism includes a shell, a fixing plate, a tube plate, a tube bundle support, an anode tube, a cathode wire, an upper gas chamber, a hanger, a gasket, an expansion joint, a hanger rod, and a high-voltage insulation box. The shell is fixedly connected to the upper side of the annular plate. The tube plate is fixedly connected to the upper side of the shell by screws. The tube bundle support is fixedly connected to the upper side of the tube plate. The tube bundle reinforcing rib is fixedly connected to the inner side of the tube bundle support. The anode tube is fixedly installed inside the tube bundle reinforcing rib, and the cathode wire is fixedly installed inside the anode tube. This utility model, through the setting of the conversion and saving mechanism, adjusts the conductivity of the anode tube, increases the cathode discharge density, and designs the cathode wire in a spiral shape, enabling the anode and cathode corona fields to generate ozone, thereby oxidizing sulfur dioxide (SO2) in the gas to sulfur trioxide (SO3).

The present application belongs to the technical field of fine chemical industry, and provides a continuous preparation method of high-carbon-chain alkyl benzene sulfonic acid, comprising: proportioning high-carbon-chain alkyl benzene and inert organic solvent to prepare diluent A; proportioning liquid sulfur trioxide and inert organic solvent to prepare diluent B; continuously and quantitatively conveying diluent A and diluent B to a premixer in two ways, conveying to a main reactor after the premixer, conveying to a solvent removal device after timed and temperature-controlled reaction, recovering inert organic solvent and aging products to obtain high-carbon-chain alkyl benzene sulfonic acid; wherein, the solvent removal device is in a negative pressure and heating environment. The problem of blockage is solved, and the method can be continuously operated; the prepared product has higher active content, lower colority and better fluidity.

The application discloses a fiber water-based dispersion system and a preparation method and application thereof. The dispersion agent for fracturing fluid provided by the application has a general formula shown in formula I. The application provides a preparation method of the dispersion agent, which comprises the following steps: after amino acid is protected by amino and carboxyl, a sulfonic acidization reaction is performed, and deprotection is performed to obtain sulfonated amino acid. The application uses a small-molecule natural amino acid with good biodegradability and low environmental toxicity as a dispersion agent, and uses a composite reagent of sulfur trioxide and an organic base to introduce a sulfonic acid group to the side chain of the amino acid in a mild, controllable and low-toxicity manner, so that good dispersibility of fibers in a hydraulic fracturing process is achieved. Meanwhile, the space steric hindrance of the natural amino acid enables the water-based dispersion system to use a smaller amount of a polymer as a stabilizer compared with a traditional system.

The invention is directed to a process to produce sulfuric acid and a plant for carrying out this process. At least one source is producing a sulfur dioxide-containing gas in an amount a, such that at least a part of the sulfur dioxide-containing gas and added oxygen are introduced as a feed gas into a pre-conversion stage to produce a sulfur trioxide-containing gas stream. The amount of inert gas added together with the oxygen is between 0 and 78 vol.-%. A partial stream of the sulfur trioxide-containing gas stream is branched off and is recycled directly into the pre- conversion stage or into the feed gas of the pre-conversion stage. The remaining sulfur dioxide-containing gas is passed through a conventional sulfuric acid plant, which comprises at least one contact stage arranged in a main converter to react sulfur dioxide with oxygen to produce sulfur trioxide. Therein, the generated sulfur trioxide-containing gas is fed to at least one absorber, where the produced sulfur trioxide is absorbed with sulfuric acid as absorption medium to form sulfuric acid. The conventional sulfuric acid plant has a capacity to convert an amount of sulfur dioxide below the amount a.

The subject of the invention is a fertilizer composite which, in terms of application, has more favorable properties than the solutions available in the prior art. Accordingly, the subject of the invention is a fertilizer composite that can be uniformly spread over a distance of more than 20 meters, is gentle on the spreader, and is rapidly utilizable in the soil, said fertilizer composite comprising: a) nitrogen derived from ammonium nitrate in an amount of about 10-30% by weight; b) calcium derived from calcium oxide in an amount of about 5-15%by weight; c) a sulfur source calculated as sulfur trioxide equivalent in an amount of about 5-15% by weight, or a magnesium source selected from calcium-magnesium oxide or magnesium oxide in an amount of about 5-15% by weight; and d) conventional additives used in fertilizer production in an amount required to reach 100% by weight, preferably ammonium sulfate in an amount of about 0.3% by weight, wherein 90-100% of the fertilizer composite has a particle size of 0.5-10 mm and the particles are essentially spherical. The average strength of the particles is about 63.74 N for fertilizers containing magnesium and about 72.83 N for fertilizers containing sulfur. The invention further relates to a method for producing the fertilizer composite according to the invention.

This invention discloses a resin catalyst for the synthesis of CPME, its preparation method, and its application, belonging to the field of fine chemical catalysis technology. The method includes the following steps: using styrene, divinylbenzene, and 4-vinylcyclohexene as monomers, suspension copolymerization is carried out in the presence of a porogen, dispersant, initiator, and aqueous phase inhibitor to obtain copolymer white spheres. These spheres are then extracted, dried, sieved, sulfonated with sulfur trioxide, and washed to obtain the product. This invention introduces a third monomer, 4-vinylcyclohexene, into the traditional styrene-divinylbenzene copolymer system. This rigid cyclic structure significantly enhances the thermal stability of the resin skeleton. Simultaneously, the use of a special dispersant, in which perfluorinated segments can oriented to the surface of the resin particles during polymerization to form a hydrophobic protective layer, significantly improves the stability of the catalyst and the selectivity for cyclopentene at higher temperatures.

This invention provides a process for synthesizing sucrose octasulfate salt, specifically relating to the pharmaceutical field. The process involves heating 30-40g of sulfur trioxide pyridine and 15-25g of pyridine to 35-40°C, stirring and mixing at 200-300 rpm, and then adding 10-15g of sucrose. Nitrogen gas is then introduced, and the temperature is slowly raised to 75-80°C, reacting for 5-7 hours. Pyridine is then separated using a reflux condenser, and 50-150ml of distilled water is added to dissolve the residual solid. The mixture is then decolorized with diatomaceous earth and filtered to obtain a filtrate. Potassium hydroxide solution is added to the filtrate until the pH reaches 9-12, followed by the addition of anhydrous ethanol. The mixture is cooled at 0-5°C to crystallize and obtain a crude product. Recrystallization is then performed for 6-7 hours, followed by solid-liquid separation to obtain a filter cake. The filter cake is then vacuum-dried at 70-80°C for 20-30 minutes to obtain the target product. This invention features simple synthesis steps, high reaction efficiency, and high product purity. Furthermore, the separation and purification operations are simple, effectively improving the yield.