447results about "Sulfur preparation/purification" patented technology

This invention belongs to the field of catalyst technology, specifically relating to a selective reduction catalyst for the production of sulfur from sulfur dioxide and its application method. The selective reduction catalyst for sulfur production from sulfur dioxide contains 1-2 wt% cobalt (CoO), 4-10 wt% molybdenum (MoO3), and 2-4 wt% zinc (ZnO), with TiO2-Al2O3 as the support. This invention exhibits good wide-temperature reaction performance, heat resistance, and water vapor resistance; the single-pass yield of elemental sulfur is higher than 80%, and the reaction process has high efficiency, showing promising application prospects.

The invention belongs to the technical field of preparation of sulfur, and particularly relates to a process for producing sulfur from sulfur dioxide. The SO2 introduced by the sulfur dioxide gas flow is selectively reduced into elemental sulfur by using hydrogen introduced by the hydrogen flow under the temperature condition of 160-320 DEG C through one or more reaction devices; each reaction device is provided with one or more selective reduction reactors which are connected in series, one or more catalyst bed layers are arranged in each selective reduction reactor, and each catalyst bed layer is filled with a selective reduction catalyst. The method is simple in process reaction, short in flow and high in efficiency, products except sulfur are water or basically water, and the method has a certain application prospect.

The utility model provides a hydrogenation reaction system for producing sulfur by reducing acid gas regenerated by activated carbon, which comprises an acid gas pretreatment system, a first-stage hydrogenation system, a second-stage hydrogenation system, a tail gas treatment system and a liquid sulfur tank, the acid gas generated by regeneration of desulfurized activated carbon is pretreated and then is subjected to hydrogenation reduction to produce sulfur, the hydrogenation is divided into two stages, wherein the primary hydrogenation is divided into a plurality of sections according to different SO2 contents, a sectional hydrogenation method is adopted, gas subjected to the primary hydrogenation enters the secondary hydrogenation, air is introduced into the gas subjected to the secondary hydrogenation, and after side reaction products generated by hydrogenation are oxidized into sulfur and SO2, residual tail gas is sent back to an inlet of the activated carbon desulfurization device. Through first-stage hydrogenation and second-stage hydrogenation, the temperature rise of the hydrogenation reaction is reduced, side reactions are reduced, and the SO2 conversion rate is improved; oxidation-method tail gas treatment is adopted to directly return to activated carbon for desulfurization, and no waste gas is discharged on the whole.

The invention belongs to the field of lithium ion battery raw materials, and particularly relates to a niobium-based composite material and a preparation method and application thereof. The composite negative electrode material is composed of a niobium-based framework material, a high-capacity material and a coating material. The niobium-based composite negative electrode material takes a porous niobium-based material as a framework, so that the characteristics of high stability, high safety and rapid charging and discharging of the niobium-based negative electrode material are kept; the high-capacity material is embedded in a niobium-based skeleton pore structure, so that the gram volume of the niobium-based material is improved, and meanwhile, the problem of rapid capacity attenuation caused by high volume expansion of the high-capacity material is solved; the coating material coats the surfaces of the niobium-based framework and the high-capacity material, and the high-capacity material is sealed in holes of the niobium-based framework material, so that on one hand, the conductivity of the niobium-based material can be improved, on the other hand, precipitation of the high-capacity material is inhibited, and the cycling stability of the composite negative electrode material is further improved. And the prepared niobium-based composite negative electrode material is simple in preparation process flow and has good adaptability to the preparation process of the existing lithium ion battery.

The invention belongs to the technical field of catalysts, and particularly relates to a selective reduction catalyst for preparing sulfur from sulfur dioxide and an application method of the selective reduction catalyst. The selective reduction catalyst for preparing sulfur from sulfur dioxide contains 1-2wt% of cobalt (in terms of CoO), 4-10wt% of molybdenum (in terms of MoO3) and 2-4wt% of zinc (in terms of ZnO), and a carrier is TiO2-Al2O3. The method has good wide-temperature reaction performance, heat resistance and water vapor resistance, the single-pass yield of elemental sulfur is higher than 80%, the efficiency of the reaction process is high, and the method has good application prospects.

The embodiment of the utility model provides zero-emission methanol preparation equipment based on garbage gasification and water electrolysis. The equipment comprises a water electrolysis hydrogen production unit, a garbage gasification unit, a first methanol synthesis unit, a second methanol synthesis unit and a gas separation unit, the water electrolysis hydrogen production unit is respectively connected with the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit; the gas separation unit is respectively connected with the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit; the water electrolysis hydrogen production unit generates hydrogen and oxygen through electrolysis; the garbage gasification unit is used for carrying out gasification reaction by using oxygen provided by the water electrolysis hydrogen production unit to prepare synthesis gas containing carbon monoxide, carbon dioxide and hydrogen; the gas separation unit is used for separating carbon monoxide, carbon dioxide and hydrogen in the synthesis gas introduced from the garbage gasification unit, the carbon monoxide and the hydrogen are introduced into the first methanol synthesis unit, and the carbon dioxide is introduced into the second methanol synthesis unit for preparing methanol respectively.

The invention relates to the technical field of sulfur recovery, in particular to sulfur recovery equipment and a recovery method thereof.The sulfur recovery equipment comprises a recovery box, a reaction box is arranged on the recovery box, an air outlet is formed in the reaction box, an air inlet pipe is arranged on the side wall of the reaction box, lifting mechanisms are arranged in the recovery box and the reaction box, and a spraying mechanism is arranged on the reaction box; and a centrifugal mechanism is arranged in the recycling box. According to the device, the lifting mechanism and the cleaning mechanism are matched, so that the atomizing nozzle can be rotationally cleaned during up-and-down movement, particles are effectively prevented from being blocked at the atomizing nozzle, a desulfurizing agent can be uniformly and smoothly sprayed, and the sulfur recovery efficiency and quality are improved; by arranging the centrifugal mechanism, under the action of centrifugal force, liquid is discharged through the drainage pipe, solid is discharged through the drainage groove, effective separation of the solid and the liquid is achieved, the treatment efficiency and quality are improved through the solid-liquid separation mode, the solid and the liquid can be conveniently and intensively treated in a distinguished mode, and further recycling of resources is facilitated.

The invention provides an upgrading and purifying method for waste tire pyrolysis carbon black, and belongs to the technical field of upgrading, purifying and high-value utilization of waste tires and waste rubber pyrolysis carbon black. The upgrading and purifying method comprises the following steps: carrying out wet magnetic separation on waste tire pyrolysis carbon black to obtain pyrolysis carbon black subjected to magnetic separation; mixing the cracked carbon black subjected to magnetic separation with hydrobromic acid for acid leaching to obtain first acid leaching filtrate and a first carbon black product; adding zinc particles into the first acid leaching filtrate to obtain second filtrate; evaporating and crystallizing the zinc bromide solution to obtain zinc bromide; zinc bromide is prepared into heavy liquid, the first carbon black product is subjected to reselection, and a pure carbon black product and silicon dioxide tailings are obtained; introducing hydrogen sulfide gas into the ferric ion solution for purification and absorption to obtain sulfur and a third filtrate; and the third filtrate is subjected to electrolytic regeneration, and a regenerated ferric ion solution and hydrogen are obtained after electrolytic regeneration is finished. According to the method, the acid leaching byproduct zinc bromide is used as a reselection medium, and resource recycling is achieved while efficient separation and impurity removal are achieved.

The invention relates to the technical field of organic solid waste treatment, in particular to a process system for hydrogen production and co-production of biological natural gas from biological crude synthesis gas, which comprises a purification unit, a hydrocarbon regulation unit, an acid removal unit, a methane upgrading unit, a hydrogen recycling and purifying unit and a methane recycling and purifying unit which are connected in sequence. The purification unit is used for removing impurities through pre-impurity removal, compression, dry-process impurity removal and wet-process desulfurization to produce purified synthesis gas and sulfur; the hydrocarbon adjusting unit is pressurized through a centrifugal compressor and adjusts the hydrogen-carbon ratio; the acid removal unit is used for removing acid gas and organic sulfur; the methane upgrading unit is used for converting CO / CO2 into methane through methanation reaction; and the recycling unit purifies hydrogen through pressure swing adsorption and recycles methane by using a membrane separation technology to produce biogas. The problems of low purity and insufficient raw material utilization rate of the traditional process are solved through the circulation process, the co-production of high-purity hydrogen and biogas is realized, and the additional value of resources is improved.

The invention relates to the field of sewage treatment, and discloses a sewage treatment method based on desulfurization and denitrification, which comprises the following steps: S1, magnetic flocculation-electro-catalysis pretreatment: adding a polyaluminum chloride-magnetic powder composite flocculant into sewage through a magnetic flocculation reactor to form a magnetic floc, removing suspended matters through a permanent magnetic separation device, and then entering an electro-catalysis oxidation pond, carrying out electrolysis by taking titanium-based lead dioxide as an anode and active carbon fiber as a cathode; and S2, performing synchronous desulfurization and denitrification on the three-dimensional electrode fluidized bed, feeding pretreated effluent into a three-dimensional electrode fluidized bed reactor, filling activated carbon particles as a third electrode, and adding a composite flora of thiobacillus and denitrifying bacteria. The efficient removal of sulfides, total nitrogen, total phosphorus and chemical oxygen demand in the sewage is realized through a multi-stage synergistic process of magnetic flocculation-electrocatalysis pretreatment, synchronous desulfurization and denitrification of a three-dimensional electrode fluidized bed, deep denitrification and dephosphorization of a denitrification filter tank and catalytic ozonation-membrane separation combined deep treatment.

An embodiment described herein provides a method of treating a gas stream, where the method includes: flowing the gas stream containing H2S and CO2 into a plasma reactor; igniting a plasma in the plasma reactor containing the gas stream; decomposing the H2S to generate H2 and elemental sulfur in the plasma generating a product gas stream; condensing the elemental sulfur from the product gas stream as a liquid; and separating the H2 from the product gas stream.

The application discloses a kind of functionalized nano sulfur preparation and its application in wound repair.The application uses PEG200 and elemental sulfur as reaction raw materials, does not introduce other organic solvents, is prepared by muffle furnace gradient heating mode at 30-70 DEG C safe reaction temperature, and obtains the spherical nano sulfur of 50-100nm particle size, has certain repair effect to normal mouse wound and diabetic refractory wound, and does not cause toxicity in vivo, with higher biological safety.Therefore, it can be used for wound repair, especially refractory wound repair.

The present invention relates to a resource recovery method for sulfide all-solid-state batteries, which belongs to the field of solid-state battery technology. The main process is: retired sulfide all-solid-state battery cells undergo sulfur-heat reaction to obtain pyrolysis slag and current collectors, the pyrolysis slag undergoes water immersion treatment, and is separated to obtain water leaching liquid and water leaching slag, the water leaching liquid is concentrated and lithium precipitation is treated to separate lithium carbonate and alkali metal hydroxide solution, the water leaching slag undergoes acid leaching treatment to separate acid leaching slag and acid leaching liquid, the acid leaching liquid undergoes phosphorus precipitation treatment to separate hydroxyphosphate and phosphorus removal liquid, the phosphorus removal liquid undergoes nickel-cobalt-manganese precipitation treatment to separate nickel-cobalt-manganese coprecipitate and neutral alkali metal halide solution, the acid leaching slag undergoes dissolution treatment to separate graphite and sulfur, and the non-polar organic solvent is recycled. This method can effectively achieve high-value-added recovery of energy metals in retired sulfide all-solid-state batteries, synergistically achieve the recovery of graphite and sulfur, with low energy consumption and emissions and high raw material utilization.

The invention discloses a waste sulfuric acid treatment method, and relates to the technical field of environmental engineering, the waste sulfuric acid treatment method comprises: a pretreatment module configured with a multi-stage filtering device and a pH adjusting tank and used for removing suspended solids in waste acid and adjusting the acid concentration; a vanadium-titanium-cerium composite catalyst is arranged in the catalytic cracking reactor, sulfuric acid is decomposed at a set temperature under microwave-assisted heating to generate SO2 gas, and meanwhile heat energy is supplied to the pretreatment unit through a waste heat recovery device; the electrochemical separation module comprises a bipolar membrane electrodialyzer and a pulse electrode array and is used for separating and recovering metal ions Fe < 3 + > and Cu < 2 + > from the cracking raffinate and regenerating sulfuric acid with a set concentration; and the intelligent control center integrates an AI algorithm and an Internet of Things sensor, and dynamically optimizes the cracking temperature, the membrane voltage and the material flow. According to the invention, intelligent sorting, directional conversion and closed-loop recovery are taken as the core, and the problems of high energy consumption, difficulty in differential treatment and heavy pollution in waste sulfuric acid treatment are solved.

The invention relates to a sodium-sulfur battery technology, and aims to provide a preparation method and application of a modified carbon-supported sulfur electrode material and a self-supporting sulfur electrode. The preparation method comprises the following steps: carrying out spray drying on a mixed solution containing aniline hydrochloric acid, ammonium persulfate hydrochloric acid and nano calcium carbonate to obtain a precursor, and carrying out carbonization and acid leaching to obtain a hydrophilic carbon carrier with primary and secondary pore channels; a positive plate is prepared to assemble a soft package battery, and potassium intercalation is realized through multiple times of potassium deintercalation and intercalation cycle treatment; disassembling and cleaning to obtain a potassium-embedded carbon carrier, reacting with transition metal nitrate, and forming monatomic transition metal clusters between graphite layers to enlarge the graphite spacing; removing potassium nitrate to obtain a modified carbon carrier which is provided with three-stage mass transfer channels and in which transition metal is loaded, then grinding and mixing the modified carbon carrier with elemental sulfur, performing heating treatment, and cooling to obtain the modified carbon sulfur-loaded electrode material. According to the invention, transition metal single atomic clusters are formed on the walls of the micropores while the interlamellar spacing of the graphite is enlarged to form the micropores, so that the cycling stability of the sodium-sulfur battery is effectively improved.

A method of treating an aqueous solution, where the method includes separating H2S from the aqueous solution, generating a gas stream including the H2S, flowing the gas stream into a plasma reactor, igniting a plasma in the plasma reactor including the gas stream, decomposing the H2S to generate H2 and elemental sulfur in the plasma generating a product gas stream including the H2, and condensing the elemental sulfur from the product gas stream as a liquid.

The invention discloses a device and a method for desulfurizing sulfide-containing wastewater and recovering sulfur, the device and the method utilize efficient reaction of iron oxyhydroxide and sulfide, excessive iron oxyhydroxide reacts to generate ferrous oxide and sulfur, and a small part of ferrous sulfide exists; the surfaces of ferrous sulfide and sulfur in a reaction product are provided with negative charges, and the surface of the residual unreacted iron oxyhydroxide is provided with positive charges, so that floc is formed through the electric neutralization flocculation action of several compounds and can be quickly precipitated; after precipitation, overlying water is treated desulfurized water, ferrous sulfide and ferrous oxide generated in the precipitate are aerated and oxidized in an iron regeneration device, iron oxyhydroxide can be regenerated, and residual sulfide in the ferrous sulfide is converted into elemental sulfur; and the generated iron oxyhydroxide can be used for treating the sulfide-containing water again, so that the sulfide-containing water is treated through reciprocating circulation, and the elemental sulfur and the iron oxyhydroxide are mixed together for continuous accumulation.

The invention discloses a preparation method of a catalyst for catalytic reduction of SO2 by CO in an oxygen-containing atmosphere, and belongs to the technical field of atmospheric pollution purification. According to the catalyst, base metals such as Fe and Cu are adopted to modify supported metal sulfide, active components of the supported metal sulfide comprise FeS, CoS2, CuS and the like, and common metal oxides such as cerium oxide, titanium oxide, aluminum oxide and the like are selected as carriers. The catalyst not only has strong SO2 catalytic reduction performance and high stability in an oxygen-containing atmosphere, but also is simple in preparation process, wide in raw material source and low in cost, has remarkable economical efficiency and environmental protection benefits, has a wide application prospect in the field of air pollution purification, and has important significance in reducing SO2 emission and improving air quality. The embodiment shows that when the oxygen volume content of the Fe elementary substance modified supported metal sulfide composite catalyst is 5%, the SO2 conversion rate is 97.9%, and the sulfur yield is 90.6%.

A system includes an outlet flowline from an activated carbon bed, a bypass flowline, a furnace, and a control system. The outlet flowline is configured to flow an acid gas stream out of the activated carbon bed after the activated carbon bed has removed benzene, toluene, and xylene from the acid gas stream. The bypass flowline includes a bypass valve and provides an alternative flow path for the acid gas stream exiting the activated carbon bed. The furnace includes a burner configured to combust at least a portion of the acid gas stream. The control system includes a temperature sensor and a controller. The temperature sensor is configured to measure a furnace temperature. The controller is configured to reduce a percent opening of the bypass valve based on the measured furnace temperature.

The invention relates to the technical field of catalyst preparation, in particular to a preparation method of a sulfur-phobic carrier loaded metal element modified silicon-molybdenum composite catalyst, which comprises the following steps: step 1, mixing a molybdenum-based material and a carrier to obtain a mixture A in which the mass ratio of the molybdenum-based material to the carrier is 0.1-20; 2, the modified metal element corresponding salt and the mixture A are evenly mixed to obtain a mixture B, and in the mixture B, the molar ratio of the modified metal element to molybdenum ions is 0.1-50; step 3, roasting for 2-10 hours at 300-800 DEG C in a protective gas atmosphere to obtain a supported metal modified molybdenum-based catalyst precursor C; 4, the catalyst precursor C is placed in a certain amount of toluene reagent, the ratio of the catalyst precursor C to the toluene reagent is 1 g / 100 mL to 1 g / 20 mL, then a silanization reagent (the volume ratio of the silanization reagent to the toluene reagent is 0.1-1) is added, stirring reflux is carried out for 3-8 hours at the temperature of 80-110 DEG C, suction filtration is carried out, washing is carried out with toluene, vacuum drying is carried out at the temperature of 20-100 DEG C, and the catalyst is obtained. The sulfur-phobic carrier loaded metal element modified silicon-molybdenum composite catalyst is obtained.

The invention belongs to the field of preparation of high-end carbon materials, and relates to a method for desulfurizing high-sulfur petroleum coke. The core of the invention is to construct a'desulfurization-acidification-regeneration 'three-step closed cycle system. The system takes magnesium oxide as a circulating medium, firstly magnesium oxide reacts with sulfur in petroleum coke at a high temperature to be converted into magnesium sulfide, then sulfur is released and recovered through an acidification step, meanwhile magnesium is converted into an intermediate product magnesium hydroxide, and finally, the magnesium medium is recovered to be active through a thermal regeneration step, magnesium oxide is obtained, and circulation is completed.

The utility model discloses a sulfur powder collecting device with a cleaning function, and relates to the technical field of sulfur product processing, the sulfur powder collecting device with the cleaning function comprises a support frame, a separator main body and a collecting assembly; the separator main body is mounted on the support frame; the collecting assembly is communicated with an inlet of the separator main body; wherein a liquid cooling device is arranged on the outer surface of the separator main body, a cleaning device is arranged in the separator main body, and a collecting hopper is arranged at the lower end of the separator main body; according to the technical key points, the liquid cooling device and the cleaning device are installed on the separator body, the liquid cooling device can achieve cooling of sulfur powder in the machining process and reduce the risk, the liquid cooling device is matched with the cleaning device, the sulfur powder attached to the inner wall of the separator body can be flushed down, leakage of the sulfur powder is avoided, and therefore the content of the sulfur powder in air is effectively reduced; the safety is higher, the using effect is good, and the good using prospect is achieved.

The invention relates to the technical field of wet smelting, in particular to a method for normal-pressure oxygen leaching of zinc sulfide concentrate and recovery of sulfur in slag. The method comprises the following steps: grinding the zinc sulfide concentrate to a target particle size; sulfuric acid and a leaching agent are added into the zinc sulfide concentrate to obtain a first reaction system, low-acid first-section normal-pressure oxygen leaching treatment is conducted on the first reaction system, and first-section normal-pressure oxygen leaching liquid and first-section normal-pressure oxygen leaching residues are obtained; the redox potential of the first reaction system is 280-380 mV; waste electrolyte is added into the first-section normal-pressure oxygen leaching residues to obtain a second reaction system, high-acid second-section normal-pressure oxygen leaching treatment is conducted on the second reaction system, and second-section normal-pressure oxygen leaching liquid and second-section normal-pressure oxygen leaching residues are obtained; the redox potential of the second reaction system is 350-450 mV; adding water into the second-section normal-pressure oxygen leaching residues to obtain slurry; performing sulfur transformation treatment on the slurry to obtain transformed slag; and recovering sulfur in the slag. The method can improve the direct recovery rate of sulfur recovery with low cost and low energy consumption.

Chemical plant for the treatment of H2S comprising: a first unit (A) for decontaminating a gaseous process / feed stream contaminated by H2S (A1) and obtaining a first gaseous waste stream (A2) containing the separated H2S and a gaseous decontaminated process / feed stream (A3), a second unit (B) for recovering elemental sulphur from H2S and obtaining a second liquid stream of elemental sulphur (B3) and a final gaseous stream containing H2O (B2), a third unit for recovering H2 from H2S, wherein said third unit sequentially comprises a second line (2) in fluid communication with the first line (1), which is detached from said first line (1), to convey at least in part said first gaseous waste stream (A2), a chemical reactor (R) for heating and decomposing at high temperature the H2S according to the endothermic reaction (I), resulting in a gaseous H2-enriched stream, at least one heat exchanger (E) to cool said H2-enriched stream and to condense the elemental sulphur, a first separator (S1) for separating said condensed elemental sulphur from said H2-enriched stream, forming a first liquid stream of elemental sulphur, a fifth line (5) for conveying said gaseous H2-enriched stream exiting said first separator (S1) a sixth line (6) for conveying said first liquid stream leaving said first separator (S1), and wherein said third unit forms a loop circuit with a portion of said first line (1) or with a portion of said first line (1) and said first unit (A).

The invention pertains to processes for processing hydrogen sulphide-containing gas mixtures to obtain elemental sulphur. The invention relates to an apparatus and a method for the gas phase catalytic oxidation of hydrogen sulphide by oxygen in a fluidized bed. The apparatus comprises an ejector, a feed line for feeding oxygen-containing gas into the lower part of a reactor, a feed line for feeding inert gas into the ejector, a reactor for the direct oxidation of hydrogen sulphide having a gas distribution tray in the lower part thereof for a catalyst, a heat exchanger, a combined unit comprising an interconnected condenser and bubbler for condensing and coagulating sulphur, and a sulphur trap for discharging sulphur. The method is carried out using a spherical catalyst mixed with an inert material. To regulate the O2 / H2S ratio in the reactor, oxygen-containing gas is fed to the ejector and via an additional line into the lower part of the reactor, or a stream of inert gas is fed to the ejector and all of the oxygen-containing gas is fed into the lower part of the reactor via the additional line. The technical result is that of maintaining an optimal oxygen / hydrogen sulphide ratio in the reactor, reducing the catalyst charge, increasing the specific yield of sulphur obtained, reducing the specific metal intensity of the apparatus and improving both the environmental soundness and the safety thereof.

The invention discloses a high-concentration sulfate acid pit water treatment method based on an acid-resistant SRB biological cathode, which comprises the following steps: enabling acid pit water to pass through a grid and then enter a regulating reservoir; introducing the wastewater in the regulating tank into a biological membrane electrochemical device for electrochemical reaction; oxidizing Fe < 2 + > in the wastewater into Fe < 3 + > on a titanium-based IrO2 anode plate and releasing electrons in an anode chamber; in the cathode chamber, an acid-resistant SRB bacterial film loaded on the surface of the carbon felt electrode reduces SO4 < 2-> into S < 2-> by utilizing transferred electrons; cO2 microbubbles are introduced into the liquid in the cathode chamber to react with S < 2-> to generate sulfur precipitates, and the reacted mixed liquid enters a cyclone separator to realize gas-solid separation; and carrying out hydrolysis reaction on Fe < 3 + > in the effluent of the anode chamber to generate Fe (OH) 3 precipitate, mixing the Fe (OH) 3 precipitate with sodium silicate, and calcining to convert the mixture into magnetic alpha-Fe2O3. The method can effectively remove SO4 < 2-> and recover iron sludge.

This invention provides an apparatus and method for enhancing the stable operation of a dual-short-path sulfur autotrophic denitrification system and recovering elemental sulfur resources, relating to the field of wastewater treatment technology. This invention utilizes an external sludge activation system to separate elemental sulfur from sludge, enhancing the activity of functional microorganisms while stripping elemental sulfur from the sludge and reducing sludge volume. Furthermore, an external elemental sulfur granulation system and an elemental sulfur precipitation tank are used to solidify and recover elemental sulfur in the system. Results from practical experiments demonstrate that the invention achieves an elemental sulfur recovery rate exceeding 90%.

Systems and methods for minimizing fuel consumption in an incinerator system in a sulfur recovery unit (SRU), including obtaining input gas flow data for streams entering the incinerator system of the SRU. Systems and methods also include making a determination of whether the SRU is operated with a tail gas treatment unit (TGTU), selecting a first relationship in response to the determination that the SRU is not operated with the TGTU and otherwise selecting a second relationship. Systems and methods further include determining an optimal incinerator system temperature based on the input gas flow data and using the first or the second relationship, determining, based on the optimal incinerator system temperature, an optimal flow rate of a fuel gas used in the incinerator system, and adjusting a fuel gas flow rate to the optimal flow rate of the fuel gas.

The present application belongs to the technical field of fine chemical industry, and relates to a recycling method of accelerator M tar. In the waste M tar produced in M production, a catalyst is added, high-temperature decomposition is carried out under nitrogen protection, and recycled raw materials aniline, carbon disulfide and intermediate benzothiazole and the like are obtained, most of which are recycled. The present application adopts common equipment and unit operations, the catalyst can be reused, and the treatment of production waste is easy to realize industrial production.

The invention discloses a preparation method of nano sulfur, which comprises the following steps: (1) adding 5-10 g of sublimed sulfur and 50 mL of N-methyl pyrrolidone into a 300 mL round-bottom flask, then placing the round-bottom flask in an oil bath at 25-125 DEG C, and stirring for 15-60 min; and (2) filtering the mixture to take filtrate, then adding the filtrate into a 300 mL beaker, adding 100-200 mL of deionized water into the beaker at one time at normal temperature under vigorous stirring, and continuously stirring for 5-10 minutes. And (3) centrifugally separating the mixture at 8000-12000 rpm for 5-10 min or filtering the mixture to obtain a precipitate, and washing the precipitate with deionized water for 3 times. And (4) placing the washed precipitate in a vacuum drying box at 80 DEG C, and drying for one night to obtain the nano sulfur. Researches show that sublimed sulfur is taken as a raw material, N-methyl pyrrolidone is taken as a solvent, deionized water is taken as a titration solvent, nano sulfur is prepared by adopting a heterogeneous titration method, and the method is simple in process, easy to operate, easy in condition control, low in synthesis cost and suitable for industrial large-scale production.