230 results about "Sulfur trioxide" patented technology

The invention belongs to the technical field of masonry cement, and particularly discloses all-solid-waste low-carbon-emission masonry cement and a preparation method thereof. Comprising the following steps: 1, finely grinding iron tailings, carbide slag, fly ash and silica fume, and proportioning according to a design to obtain a cement raw material; 2, agglomerating or pelletizing the cement raw material, and calcining according to a designed temperature to obtain a cement clinker; and 3, mixing the cement clinker with a certain proportion of gypsum, and grinding to the target fineness to obtain the masonry cement. The masonry cement is prepared from all solid wastes, meanwhile, a calcium source is mainly provided by the carbide slag with low carbon emission, compared with cement fired by calcium carbonate calcium sources, the carbon emission is greatly reduced, the goal of high-valued and green utilization of various solid wastes including iron tailings is achieved, and the method is suitable for industrial production. The compressive strength, the sulfur trioxide content and the screen residue of the prepared masonry cement meet the national standard requirements of masonry cement. In addition, the masonry cement is prepared from all solid waste raw materials, so that the preparation cost of the masonry cement is reduced.

The invention discloses a continuous preparation method of sodium tanshinone IIA sulfonate based on a single-tube thin-layer liquid membrane reactor. Comprising the following steps: (1) dissolving tanshinone IIA in an organic solvent as a feed liquid; (2) reacting gas-phase sulfur dioxide with air, and cooling to obtain sulfur trioxide mixed gas; (3) enabling the feed liquid and sulfur trioxide mixed gas to enter a single-tube thin-layer liquid membrane reactor in a parallel flow or reverse flow manner, and carrying out continuous sulfonation reaction to obtain reaction liquid; and (4) adding a sodium salt aqueous solution into the reaction solution to carry out salt forming reaction, centrifuging, drying and purifying to obtain the tanshinone IIA sodium sulfonate. According to the invention, a novel method is adopted to carry out sulfonation reaction on tanshinone IIA, and sulfur trioxide is basically completely consumed after the reaction is finished, so that the generation of waste acid is greatly reduced, and the method has important significance on environmental protection and cost reduction. The green, safe, efficient and continuous preparation of the high-purity tanshinone IIA sodium sulfonate is realized.

Methods and associated production plants are disclosed for producing concentrated oleum or sulfur trioxide therefrom with high purity, and particularly with minimal sulfur dioxide. The methods involve use of a single contact, single absorption sulfuric acid plant operating under an unconventional set of parameters including: reacting sulfur and high purity oxygen in a combustion reactor to form sulfur dioxide at a concentration between 11.5 and 20% by volume and with an atypical oxygen to sulfur dioxide molar ratio ≥ 1; atypically catalytically converting > 96% by volume of the sulfur dioxide to sulfur trioxide in a contact apparatus; and atypically recycling > 95% by volume of the total gases from an absorption apparatus to the combustion reactor. Concentrated oleum with < 300 ppm dissolved sulfur dioxide can desirably be produced with sulfur utilization ≥ 80% using a smaller, cost-effective sulfuric acid plant. The co-production of unnecessary sulfuric acid can also be reduced.

The invention belongs to the field of medicine, health and health, and particularly relates to a preparation method for controllably synthesizing polysulfonic acid mucopolysaccharide with different molecular weights, which comprises the following steps: reaction, acid-base neutralization, formamide removal by alcohol precipitation, desalting and freeze-drying. Wherein the reaction process comprises the following steps: adding sodium chondroitin sulfate and a pyridine sulfur trioxide complex into a mixed solvent of N, N-dimethylformamide and dimethyl sulfoxide, and heating for reaction to obtain a reaction mixture; the volume fraction of the dimethyl sulfoxide in the mixed solvent is 0-80%. According to the method, the low-price pyridine sulfur trioxide complex (about 150 yuan / 500g) is used, and the ratio of N, N-dimethylformamide to dimethyl sulfoxide in the mixed solvent is adjusted, so that the solubility of the chondroitin sulfate sodium and the pyridine sulfur trioxide complex is changed, and the polysulfonic acid mucopolysaccharide with molecular weights in different ranges can be regulated and generated.

The invention relates to the technical field of sulfuric acid production, in particular to a flue gas separation and purification system applied to preparation of electronic-grade sulfuric acid. Comprising a primary treatment tank for removing flue gas impurities, a secondary treatment tank for absorbing sulfur trioxide gas in flue gas, an evaporation tower for evaporating the sulfur trioxide gas from nicotinic acid and a condensation tank for efficiently liquefying the sulfur trioxide gas, impurities and sulfur trioxide gas in flue gas are deeply removed and efficiently enriched through the multi-stage treatment tank in a dual mode of liquid film absorption and spraying absorption, nicotinic acid is subjected to multi-stage evaporation through the preheating cylinder and the evaporation pipe, and separation and purification of the sulfur trioxide gas are achieved in cooperation with the condensation tank and the condensation assembly. And multi-stage condensation treatment combining path extension type pre-condensation, small-strand distributed type secondary condensation and dynamic rotary type comprehensive condensation is carried out, so that an efficient and high-quality condensation purification effect is further achieved.

The present disclosure provides anionic citrate-based composition for use in regenerative applications. The disclosed composition may take the form of a scaffold and generally includes (i) a citrate component, (ii) a diol, and (iii) an anionic moiety. The anionic moiety may include one or more of a sulfate, sulfonate, phosphate, phosphonate, sulfamate, or carboxylic acid, The sulfate and / or sulfonate containing moiety may be conjugated via an amidation reaction, esterification, and / or substitution reaction with a sulfur trioxide complex. A peptide may be conjugated to a surface of the composition.

The invention discloses a method for jointly recovering zinc and cadmium from zinc-cadmium slag of zinc hydrometallurgy. The method comprises the following steps: S1, carrying out acid leaching on the zinc-cadmium slag and adding zinc powder for replacement; s2, sponge cadmium is subjected to vacuum melting; s3, adding clear water and calcium oxide into the cadmium alkaline residues for wet grinding, filtering to obtain clear liquid and filter residues, and returning sodium hydroxide obtained after the clear liquid is evaporated and crystallized to S2; s4, the filter residues are subjected to reduction roasting, recyclable zinc-cadmium smoke dust, calcium oxide residues and sulfur trioxide are obtained, the calcium oxide residues are returned to S3, sulfuric acid is prepared from sulfur trioxide, and a part of sulfuric acid is returned to S1; the other part of sulfuric acid enters the next step; s5, the smoke dust is dissolved with sulfuric acid, a sulfuric acid solution containing zinc and cadmium is obtained, then zinc powder is added for replacement, and sponge cadmium and a zinc sulfate solution are obtained; the sponge cadmium returns to S2, and the zinc sulfate returns to S1. According to the method, the cadmium alkaline residue treatment product can be effectively recycled and utilized, the cadmium alkaline residue treatment cost is reduced, no cadmium element flows out of the process to cause environmental pollution, and the method is an environment-friendly process method.

The invention discloses a denitration and dust removal fault analysis system and method based on ammonia-sulfur ratio calculation, relates to the technical field of environment-friendly emission of coal-fired power plants, and realizes early warning and intelligent response to faults of a denitration system. The method comprises the following steps: collecting flue gas parameters, coal quality parameters and unit parameters; calculating the ammonia escape concentration based on the ammonia spraying amount in the flue gas parameters and the unit parameters to obtain an ammonia escape concentration predicted value; determining a sulfur dioxide concentration and a target conversion rate according to the coal quality parameters and the unit parameters, calculating a sulfur trioxide concentration according to the sulfur dioxide concentration and the target conversion rate, and calculating an ammonia-sulfur ratio according to the sulfur trioxide concentration and an ammonia escape concentration prediction value; determining the generation amount of ammonium bisulfate, and reading the equipment temperature in the unit parameters; and according to the ammonium bisulfate generation amount, the ammonia-sulfur ratio and the equipment temperature, determining an early warning grade and a response measure, adopting an execution mechanism module to execute the response measure, and sending an early warning signal corresponding to the early warning grade to a specified terminal.

Provided herein are methods and systems for treating a sulfur dioxide-containing gaseous stream. The method includes combusting a tail gas in an excess of oxygen gas to yield a thermal oxidizer effluent containing sulfur dioxide and oxygen. The thermal oxidizer effluent is introduced to an oxidative catalytic converter to convert sulfur dioxide to sulfur trioxide, thereby forming an oxidized gas stream. The oxidized gas stream is routed to a quench tower and contacted with a dilute aqueous acid quench stream to yield sulfurous acid, hydrated sulfur dioxide, or both. The sulfurous acid or hydrated sulfur dioxide is oxidized with the excess of oxygen from the thermal oxidizer effluent to yield sulfuric acid.

The invention discloses a sulfur-containing waste gas and waste liquid treatment method and equipment, and particularly relates to the technical field of sulfur-containing waste gas and waste liquid treatment.The sulfur-containing waste gas and waste liquid treatment method is characterized in that a cracking incineration unit, a catalytic oxidation unit, a condensation and concentration unit and a tail gas purification unit are included; sulfur-containing waste gas and waste liquid are sequentially cracked and incinerated into sulfur dioxide, then converted into sulfur trioxide and condensed to form sulfuric acid, sulfur dioxide in tail gas is converted and washed to form dilute acid, sulfuric acid trioxide mist in the tail gas is removed under the action of a high-voltage electric field, and the tail gas is discharged from a chimney. And the effects of ultra-clean emission and high total sulfur recovery rate are achieved under the condition of meeting tail gas emission indexes.

The invention provides a sulfur trioxide monitoring and emission control optimization adjustment method, and belongs to the technical field of optimization adjustment, and the method comprises the steps: carrying out the real-time synchronous monitoring of sulfur trioxide in supercritical boiler flue gas through different types of sensors, carrying out the data preprocessing and data fusion processing of a synchronous monitoring result, and carrying out the real-time monitoring of the sulfur trioxide in the supercritical boiler flue gas; and correcting the processed data by combining a correction model established with the parameters of the supercritical boiler, carrying out deep mining on historical monitoring data, historical operation parameters of the supercritical boiler and historical operation states of the flue gas treatment equipment, establishing a sulfur trioxide control model, and carrying out real-time monitoring on the sulfur trioxide control model. And a cooperative control instruction of the flue gas treatment equipment and desulfurization adjustment parameters in a desulfurization system are determined according to an output result, optimization control adjustment is performed, a model is established, an effective control result is output through analysis of a current monitoring result, and optimization and regulation of the equipment are intelligently realized.

The invention discloses a treatment process and a treatment system for crystallization of photovoltaic wastewater calcium fluoride sludge, limestone particles and photovoltaic sludge are mixed according to a mass ratio of 3%-5% to obtain a homogeneous mixed material, the homogeneous mixed material is pre-dried and then fed into a rotary kiln, sintering is carried out at 1200-1500 DEG C for 1.5-3 hours, and the sintered material is cooled to room temperature. Calcium fluoride is attached to the surface of the silicate framework, sulfur trioxide and calcium oxide are released at the same time, after sintering is finished, the material is subjected to annealing treatment in a rotary kiln, calcium fluoride seed crystals accounting for 0.1%-1.0% of the total mass of the material are added, calcium fluoride crystals are induced to grow directionally and be repaired, and the calcium fluoride is obtained. According to the method, the purity of calcium fluoride is increased to 75%-85%, the sulfur content in the product can be controlled to be 0.1% or below, and the cold compressive strength of the pellets prepared from the product reaches 2.5 MPa or above.

The invention relates to a method for removing cyclohexane in a low-molecular brominated polystyrene recovery solvent, which comprises the following steps: adding the recovery solvent containing cyclohexane and dichloromethane into a reaction bottle, and then adding a certain amount of fuming sulfuric acid; stirring and reacting for a period of time at a certain reaction temperature; adding water for quenching, standing for layering, washing an organic layer to be neutral, and standing for layering; and rectifying the organic layer, and collecting corresponding fractions. The used fuming sulfuric acid contains excessive sulfur trioxide, the sulfonation capacity is higher, cyclohexane is sulfonated to generate sulfonic acid group cyclohexane, then the sulfonic acid group cyclohexane is removed through water washing, the removal rate is high, the operation is convenient and fast, the cost is low, and the method is suitable for industrial production.

The application discloses a flue gas recovery system in a calcination zinc sulfide process and relates to the technical field of zinc sulfide production. The flue gas recovery system comprises, which are connected by pipelines in sequence, a waste heat recovery boiler, a bag-type dust collector, an electrostatic precipitator, a mixed converter, a cyclone separator, an absorption tower and a spray tower. The mixed converter comprises an outer cavity, an inner cavity and a tail gas inlet pipe. The tail gas inlet pipe is connected with one end of the inner cavity. The outer cavity is provided with a medium inlet at the end far from the tail gas inlet pipe. The outer cavity is provided with a medium outlet at the end far from the medium inlet. The inner cavity is provided with a tail gas outlet pipe at the end far from the tail gas inlet pipe. An oxygen inlet and a powder inlet are installed on the side wall of the inner cavity. The inner cavity is internally provided with a turbulence column. Under the guidance of the turbulence column, the tail gas, oxygen and catalyst powder can be fully mixed, which can accelerate the reaction speed of sulfur dioxide and oxygen in the tail gas, thereby accelerating the generation speed and quality of sulfur trioxide.

The invention provides a method for analyzing the influence of a supercritical boiler flue gas treatment facility on sulfur trioxide emission, and belongs to the technical field of influence analys.The method comprises the steps that sampling probes are arranged at different target positions of a supercritical boiler flue, sampling frequencies are set according to boiler operation conditions and research requirements, and multi-point synchronous sampling is conducted on flue gas; determining the concentration of sulfur trioxide at each target position, and meanwhile, monitoring the temperature, pressure and flow velocity of the flue gas at the target position in the sampling process as supplementary results; determining the optimal operation parameters of the flue gas treatment facility by combining the current operation parameters of the supercritical boiler; collecting current operation parameters of the flue gas treatment facility, and determining an influence coefficient of the flue gas treatment facility on sulfur trioxide emission; and determining a control set according to the influence coefficient in combination with an operation attenuation factor of the flue gas treatment facility. The reasonable analysis on the influence and the dynamic optimization on the operation of the flue gas treatment facility are realized.

The invention provides an air pre-heater anti-blocking method and system based on sulfur trioxide monitoring, and the method comprises the steps: estimating a sulfur trioxide concentration original value based on coal quality analysis, equipment description and field testing; a sulfur trioxide sampling device and instrument analysis are combined, and sulfur trioxide concentration sampling values of an inlet and an outlet of a dust remover, a desulfurization inlet and an inlet of a chimney are respectively tested by using a representative point sampling method; based on the original value of the sulfur trioxide concentration and the sampling value of the sulfur trioxide concentration, determining a generation and conversion rule and emission characteristics of the sulfur trioxide, and establishing a sulfur trioxide monitoring technical route; determining a sulfur trioxide emission reduction scheme based on the sulfur trioxide monitoring technical route and the flue gas treatment facility operation parameters; according to the air pre-heater anti-blocking method, the air pre-heater operation parameters and the sulfur trioxide emission reduction scheme are combined, the air pre-heater anti-blocking measures are generated, facility parameters are optimized through sulfur trioxide monitoring and emission characteristics, then air pre-heater blocking is prevented, and the air pre-heater anti-blocking effect is effectively improved.

The application relates to the technical field of biomass utilization, and relates to a continuous preparation technology of furfural from corncob, which comprises the following steps: S1: corncob is crushed into powder, then is mixed with sulfur trioxide, and is subjected to steam explosion under steam pressure; S2: acid catalysis-extraction reaction; S3: the once-extracted phase is subjected to solid-liquid separation, the liquid phase is subjected to secondary extraction by using an extracting agent, and a secondary extraction phase is obtained; S4: the once-extracted phase and the secondary extraction phase are combined and are sent into a rectifying tower for rectification, and furfural with a purity greater than 99% is obtained. The application has the beneficial effects that: 1. after the corncob is crushed, the corncob is mixed with sulfur trioxide and is subjected to steam explosion, hemicellulose can be effectively stripped from lignin, the subsequent reaction of preparing furfural from hemicellulose by acid catalysis can be more easily carried out, and the yield is higher; 2. in the method, acetic acid and aluminum chloride are used as mixed acid catalysts, the reaction temperature is reduced by 20-40 DEG C compared with one-pot method, and the reaction pressure is reduced by 0.4-0.7 MPa.G compared with one-pot method, so that the requirement of the reaction on equipment is reduced.

The invention relates to an aromatic hydrocarbon sulfonation method and system using sulfur trioxide, and relates to the technical field of fine chemical raw material synthesis, and the aromatic hydrocarbon sulfonation method using sulfur trioxide comprises the steps of reactant pumping, main reaction, temperature judgment, ambient temperature judgment I and ambient temperature judgment II. The reaction temperature can be adjusted under different temperature conditions, the probability of byproducts is gradually reduced in the reaction process, and then the generation of the byproducts is reduced after the reaction is finished.

The invention relates to the technical field of synthesis of ester compounds, in particular to a preparation method of an ester compound based on a sulfur trioxide compound. The method comprises the following steps: by taking a sulfur trioxide compound as a carboxylic acid activating agent and taking a carboxylic acid-containing compound and a hydroxyl-containing compound as raw materials, carrying out esterification reaction at room temperature in a reaction system of an alkali substance, a sodium salt stabilizer and a solvent, activating carboxylic acid by sulfur trioxide to form an active intermediate, and reacting the active intermediate with hydroxyl to generate an ester compound. The ester compound based on the sulfur trioxide compound is obtained, and sodium sulfate precipitate is obtained at the same time. According to the method, acyl chloride, thionyl chloride or unstable condensation reagents with high corrosivity are not used in the reaction, chlorine-containing wastewater is not generated, the reaction is carried out at room temperature, heating or high temperature is not used, the reaction condition is mild, the product is easy to separate, the use of organic solvents can be effectively reduced through post-treatment, and the product yield is relatively high.

The utility model belongs to the technical field of chemical equipment, and discloses a sulfur dioxide oxidation sulfuric acid catalyst preparation device with a dehumidification mechanism, which comprises a first reaction box, a first catalyst is arranged in the first reaction box, and a second reaction box is arranged on the right side of the first reaction box. A first catalyst is arranged in the first reaction box, a second catalyst is arranged in the second reaction box, a heating wire is arranged in the second reaction box, and the heating wire, a controller, a first connecting pipe, an air pump, a second connecting pipe, a third reaction box and dehumidification filler are arranged, so that the interior of the first reaction box is used for reacting sulfur dioxide, and the interior of the second reaction box is used for reacting sulfur trioxide; the heating wire can heat sulfur trioxide gas, the temperature is controlled through the controller, then the sulfur trioxide gas is input into the third reaction box through the air pump, moisture and impurities in the preheated gas can be removed through the dehumidification filler, the humidity of the gas can be reduced, and the concentration of sulfuric acid can be improved.

A method for manufacturing electronic-grade sulfuric acid includes following steps: providing sulfur-containing material; burning the sulfur-containing material with pure oxygen to obtain sulfur dioxide gas; converting the sulfur dioxide gas into sulfur trioxide gas; and processing the sulfur trioxide gas to obtain the electronic-grade sulfuric acid.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.

The utility model provides a sulfur trioxide gas condenser which comprises a condensing box, a cooling assembly is arranged in the condensing box, an auxiliary heat dissipation assembly is arranged in a water storage base, and cooling water in the water storage base is conveyed into a plurality of water guide vertical pipes through a water inlet pipe and a flow dividing shell by a circulating pump; the cooling water can cool the water guide vertical pipe, so that the water guide vertical pipe absorbs heat and cools sulfur trioxide gas entering the condensation box through the heat conduction filler, the heat absorption sleeve and the heat absorption fins, and meanwhile, the travel path of the sulfur trioxide gas in the condensation box can be prolonged through the multiple baffles which are arranged in a staggered mode. Therefore, the axial flow fan can blow air to the interiors of the multiple heat absorption pipes through the connecting shell for cooling, so that the multiple heat absorption pipes adsorb most heat of cooling water in the water storage base, and the situation that the heat of the cooling water in the water storage base is easily accumulated is avoided.

A chemical synthesis method for the Klebsiella toxin Tilimycin relates to the field of biomedical chemical analysis and synthesis technology. The method includes the following steps: (1) mixing bis(trichloromethyl) carbonate dissolved in a polar aprotic solvent with 3-hydroxy-an-aminobenzoic acid in a certain proportion to undergo a substitution reaction, heating and stirring to obtain intermediate product 1; (2) mixing intermediate product 1 with (S)-2-pyrrolidone dissolved in a polar aprotic solvent in a certain proportion to undergo ammonolysis and hydrolysis reactions, heating and stirring, filtering, and purifying by prep-HPLC to obtain intermediate product 2; (3) mixing intermediate product 2 with pyridine sulfur trioxide dissolved in a polar aprotic solvent and DCM in a certain proportion under alkaline conditions to undergo oxidation and amination reactions, stirring at low temperature, vacuum drying, and purifying by prep-HPLC to obtain the target compound Tilimycin. This invention enables the efficient synthesis of the Klebsiella toxin Tilimycin with high purity and good stability, thus providing a material basis and technical method for scientific research related to this toxin.

To provide a method for producing a hydraulic hardened body, which reduces the amount of energy consumption and the amount of CO2 discharge in material production and is excellent in producibility of a precast product.SOLUTION: A method for producing a hydraulic hardened body includes kneading and hardening a hydraulic composition containing a binder (A), an admixture (B), water, an aggregate, and an admixture, wherein the proportion of the admixture (B) in the total of the binder (A) and the admixture (B) is 2 mass% to 10 mass%. In the binder (A), the proportion of the high-early-strength portland cement is 20 mass% to 55 mass%, the proportion of the blast furnace slag fine powder is 45 mass% to 75 mass%, and the total of these two components accounts for 90 mass% or more of the whole. The admixture (B) contains organic calcium salts, inorganic calcium compounds, and inorganic sulfates, and has a CaO content of 53 mass% to 58 mass%, a SO3 content of 15 mass% to 20 mass%, a total alkali content of 2.5 mass% to 2.8 mass%, and an ignition loss of 20 mass% to 25 mass%.SELECTED DRAWING: None

The invention discloses a resin catalyst for synthesizing CPME and a preparation method and application thereof, and belongs to the technical field of fine chemical catalysis, and the preparation method comprises the following steps: by taking styrene, divinyl benzene and 4-vinyl cyclohexene as monomers, carrying out suspension copolymerization in the presence of a pore-foaming agent, a dispersing agent, an initiator and a water-phase polymerization inhibitor to prepare a copolymer white ball, and then carrying out extraction, washing and drying to obtain the resin catalyst for synthesizing CPME. And drying, screening, sulfonating with sulfur trioxide, and washing to obtain the product. According to the invention, a third monomer 4-vinyl cyclohexene is introduced into a traditional styrene-divinyl benzene copolymerization system, and the rigid cyclic structure can significantly enhance the thermal stability of a resin skeleton; the perfluorinated chain segments in the dispersant can be directionally arranged to the surfaces of resin particles in the polymerization process to form a hydrophobic protection layer, so that the stability of a catalyst and the selectivity of cyclopentene at a relatively high temperature can be remarkably improved.

The present application relates to a kind of methods and devices for preparing anhydrous hydrogen fluoride and sulfuric acid.The method comprises the following steps: removing impurities from industrial waste fluorosulfuric acid, mixing it with concentrated sulfuric acid to form a pretreated mixture; using microwave heating to rapidly heat the reactor, a static bed is arranged in the reactor; the pretreated mixture is passed into the upper surface of the static bed in the preheated reactor, the pretreated mixture is heated by microwave, and hydrogen fluoride and sulfur trioxide gas are generated by the decomposition of the pretreated mixture; hydrogen fluoride and sulfur trioxide are mixed and passed into low-temperature concentrated sulfuric acid to absorb sulfur trioxide gas; then passed into low-temperature condensing equipment, and liquid hydrogen fluoride is collected; the liquid hydrogen fluoride is purified by rectification; and the concentrated sulfuric acid that absorbs sulfur trioxide is evaporated and concentrated.The advantages are: using a "static bed + material" double-wave absorption system, achieving more uniform and stable temperature field distribution in the liquid layer of industrial waste fluorosulfuric acid, making the pyrolysis of industrial waste fluorosulfuric acid more efficient and stable.

The utility model discloses a system for preparing concentrated sulfuric acid by regenerating dilute sulfuric acid of an alkylation device. The system comprises a raw material pretreatment unit, an incineration conversion unit, a product purification and absorption unit and a tail gas treatment unit, the raw material pretreatment unit is used for carrying out drying, liquid separation, mixing and preheating on used air, hydrogen sulfide and dilute sulfuric acid raw material gas and then conveying the raw material gas to the incineration conversion unit; the incineration conversion unit is used for converting hydrogen sulfide and dilute sulphuric acid into sulfur trioxide gas under the action of oxygen-enriched air and a catalyst, and the sulfur trioxide gas generated by the incineration conversion unit enters the purification and absorption unit; the product purification and absorption adopts concentrated sulfuric acid to absorb sulfur trioxide gas to generate a concentrated sulfuric acid product, and acid-containing tail gas generated by purification and absorption enters a tail gas treatment unit to be treated. According to the device, co-combustion of hydrogen sulfide and dilute sulfuric acid in the incinerator is achieved, concentrated sulfuric acid with high concentration is obtained through subsequent conversion, purification, absorption and tail gas treatment, and cyclic regeneration of sulfuric acid is achieved.

The application belongs to the technical field of biological medicine, and relates to synthesis of a medicine, in particular to a preparation method of picrosulfa sodium. Phenol and 2-pyridine formaldehyde are used as raw materials, trifluoroacetic acid and formic acid are used as reaction solvents, concentrated sulfuric acid is added dropwise, 4,4'-(2-pyridine methylene)-bisphenol crude product is obtained after the reaction is completed, the 4,4'-(2-pyridine methylene)-bisphenol crude product is refined to obtain 4,4'-(2-pyridine methylene)-bisphenol pure product; the 4,4'-(2-pyridine methylene)-bisphenol pure product is subjected to a sulfonation reaction by using sulfur trioxide pyridine complex, and then subjected to an alkali neutralization reaction to obtain picrosulfa sodium crude product, and the picrosulfa sodium crude product is refined to obtain picrosulfa sodium pure product. The application can reduce the generation of isomers, improve the yield, is suitable for industrial production, and the prepared picrosulfa sodium meets the requirements of the quality standard of the European Pharmacopoeia.

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.