149 results about "Carbon sulfide" patented technology

The invention relates to the field of chelating agent preparation, in particular to an efficient metal chelating agent and a preparation method and application thereof. The preparation method comprises the following preparation steps: (1) dissolving dibutanol amine in absolute ethyl alcohol, adding carbon disulfide, reacting for 5-8 hours at 0-5 DEG C in a nitrogen atmosphere, adjusting the pH to be neutral by using a sodium hydroxide aqueous solution, and performing rotary evaporation to obtain sodium bis (4-hydroxybutyl) dithiocarbamate; and (2) adding 4-[bis (beta-chloroethyl) amino] benzaldehyde, the bis (4-hydroxybutyl) sodium dithiocarbamate obtained in the step (1) and a catalyst into absolute ethyl alcohol, heating and refluxing, reducing pressure to remove absolute ethyl alcohol, adding the obtained solid into pure water, stirring, extracting, combining organic phases, drying moisture in the organic phases, concentrating, standing for 10-20 hours, and separating to obtain the metal chelating agent. The prepared metal chelating agent has good dispersity and solubility in various solvents, and a stable metal chelate is formed through coordination chelation of active functional groups and heavy metal ions.

The invention relates to a method for preparing lithium sulfide at low temperature by microwave molten salt assisted carbon disulfide-lithium salt reaction, and belongs to the technical field of key materials of lithium-sulfur batteries and solid-state batteries. The technical problems of high energy consumption, difficulty in inhibiting by-products, insufficient purity and crystal phase stability, difficulty in continuous amplification and the like in the existing lithium sulfide preparation process are solved. Comprising the following steps: step 1, performing crushing, screening and grading treatment on lithium source powder; step 2, placing the treated lithium source powder and molten salt in a closed reactor, and introducing CS2 in a gas or liquid form; 3, applying microwave radiation, and reacting at a gas-solid-liquid multiphase interface to generate lithium sulfide; and 4, cooling the material after the reaction to room temperature, separating and recovering the fused salt to obtain the lithium sulfide powder. The method is low in reaction temperature, low in energy consumption, high in reaction rate, high in product purity and suitable for continuous and industrial production.

The invention discloses a high-strength energetic compound based on a polydopamine and thiourea polymer and a preparation method of the high-strength energetic compound, and the energetic compound is composed of energetic crystal 1, 3, 5-triamino-2, 4, 6-trinitrobenzene, the polydopamine and the thiourea polymer. The preparation method comprises the following steps: modifying an energetic crystal 1, 3, 5-triamino-2, 4, 6-trinitrobenzene through polydopamine in advance; the polythiourea is obtained through reaction of 2, 2 '-(ethylene dioxygen) diethylamine, carbon disulfide and trimethylolpropane tripolypropylene glycol ether, and the addition amount is 2.5 wt.%-10 wt.%; and mixing the two components by a kneading method, and drying to obtain the energetic compound. The obtained compound has the characteristics of strengthening and toughening, the Brazil mechanical strength reaches 14.76 MPa, and the fracture strain reaches 0.474%. By introducing polyphenol polydopamine and polythiourea to achieve a synergistic effect, the mechanical property of the explosive is greatly improved, and a technical support can be provided for the application of the explosive; meanwhile, the preparation method is simple, mild in reaction condition and easy for large-scale production.

The invention discloses a lactobacillus brevis SMF L6 strain for improving the characteristic flavor of fermented fish and application thereof, and belongs to the technical field of aquatic product processing. According to the method disclosed by the invention, low-temperature fermentation is carried out by utilizing a sake lactobacillus wide cloth SMF L6 direct vat set fermentation inoculant to regulate and control the flavor; the method can effectively promote the production of flavor substances such as n-hexyl alcohol, eudesmol, 2-ethylhexyl alcohol, 4-platycladi alcohol, linalool, 4-terpene alcohol, alpha-terpilenol, piperonone, beta-myrcene, alpha-terpinene, D-limonene, beta-phellandrene, gamma-terpinene and the like in the fermented fish. The content of pungent smell and fishy smell substances such as acetic acid, p-xylene, o-xylene, trimethylamine, methyl mercaptan and carbon disulfide is reduced.

The invention relates to a heating furnace for carbon disulfide production, and relates to the technical field of carbon disulfide production, the heating furnace comprises a furnace body comprising an outer furnace box body, an inner furnace box body and a supporting pipe; the sulfur supply assembly comprises a combustion chamber, a liquid sulfur pipe and a spray head; the methane supply assembly comprises a methane gas pipe, a transfer piece, a communicating pipe and a mixing plate; the mixing assembly comprises a rotating blade, a driving fan blade, a bevel gear ring, a bevel gear and a flow guide fan blade; the exhaust assembly comprises a first exhaust pipe, a second exhaust pipe, a third exhaust pipe and a fourth exhaust pipe; by uniformly introducing gaseous sulfur and methane gas into the inner furnace box body and stirring and turning the gaseous sulfur and methane gas through the mixing plate, sulfur and methane are easily and uniformly mixed, the yield of carbon disulfide can be increased, and efficient production of carbon disulfide is facilitated. The method has the effect of improving the mixing degree of sulfur and methane.

The invention provides a preparation method and application of a modified PVC adsorbent for gold extraction of carbonaceous gold ore, and belongs to the technical field of organic polymer materials and resource utilization. Based on construction of a hydroxylation-xanthate esterification reaction and bifunctional adsorption sites, a series of chemical modification paths of acetate nucleophilic substitution-hydrolysis-carbon disulfide alkali treatment are established, and xanthate functional groups with high reaction activity are accurately constructed on an inert PVC framework. Sulfur atoms in xanthate groups of the modified PVC are excellent electron donors and can generate strong chemical adsorption with metal impurities or polar sites on the surface of carbon, meanwhile, Van der Waals interaction between a main chain of the modified PVC and the carbon is reserved, and unmodified PVC or single hydroxylated PVC does not have the synergism of chemical adsorption and physical adsorption, so that the modified PVC can be used for preparing the carbon-modified PVC composite material, and the carbon-modified PVC composite material can be used for preparing the carbon-modified PVC composite material. And leap-type improvement of the adsorption capacity and selectivity of organic carbonaceous in minerals is realized.

The invention belongs to the field of smelting, and particularly relates to a treatment method of mineral separation volatile gas, which comprises the following steps: collecting gas volatilized from a mineral separation tank, incinerating, and conveying the incinerated gas to an existing flue gas acid-making system for treatment. According to the scheme, volatile gas generated by reagent reaction during mineral separation is collected and then subjected to high-temperature incineration treatment, and sulfur dioxide and carbon dioxide are produced after carbon disulfide is subjected to high-temperature combustion; hydrogen sulfide is decomposed into water and sulfur dioxide after high-temperature combustion, and sulfur dioxide is an atmospheric pollutant and can be treated by an existing flue gas acid making system. According to the scheme, the peculiar smell of the volatile gas can be eliminated in the most efficient and clean manner by utilizing the existing equipment and facilities, and the gas treatment pressure is not increased for enterprises.

The utility model provides rapid enrichment equipment for light hydrocarbon oil, medium hydrocarbon oil and crude phenol in medium and low temperature coal tar, which adopts five solvent storage tanks to store and take recovered solvents (acetone, carbon disulfide, petroleum ether, methanol and acetonitrile) in each step so as to be recycled in cycles; carrying out deliming treatment on the medium-low temperature coal tar by using an acetone / carbon disulfide mixed solvent; petroleum ether and methanol, petroleum ether and acetonitrile, and methanol and carbon disulfide are used for carrying out step-by-step double-solvent layered extraction on the de-ashed tar. The device disclosed by the utility model realizes rapid enrichment of target components in medium and low temperature coal tar, provides extract oil which is simple in composition and easy to process for subsequent secondary upgrading, and solves the problems of high energy consumption, difficulty in large-scale commercialization and the like in the prior art.

Described are electrodes composed of a carbonaceous matrix with sulfurized carbon particles. These particles feature sulfur atoms covalently bonded to carbon atoms, internal pores, and sulfur molecules both adsorbed and contained within these pores. The structure includes electrically conductive filaments and particle agglomerates fused to a subset of these filaments, which possess specific length and width dimensions and extend as anchor segments to connect adjacent particles. Additionally, the electrode incorporates yarns made from a second subset of filaments, characterized by lengths and widths exceeding those of the initial filaments, spanning between the particle agglomerates. The resultant electrode shows unique electrochemical behavior that enhances its energy density over other carbonaceous sulfurized carbon materials.

The invention relates to an efficient gas-solid reaction process and an integrated industrial system, and belongs to the technical field of gas-solid reaction in chemical production. The process flow comprises the following steps: crushing and drying coke by a pulverizing unit, preheating the coke and sulfur steam to be greater than or equal to 550 DEG C, and jointly entering a gas-solid reaction unit; and the product enters a gas-solid separation unit, is subjected to two-stage gas-solid separation at a high temperature of 450-680 DEG C and a low temperature of less than or equal to 200 DEG C, and then is The integrated industrial system based on the efficient gas-solid reaction process is applied to carbon disulfide production through a coke method, the problems of external heat supply and byproduct generation control in the reaction process of coke and sulfur are solved, and the system is simple in process chain, easy and convenient to operate, compact in structure and suitable for continuous and closed carbon disulfide production requirements through the coke method.

The invention discloses a polyamide-based thiourea compound and a preparation method and application thereof. The invention comprises the following steps: mixing an isonitrile compound and a diamine compound, adding an organic solvent, dissolving and then adding carbon disulfide, stirring for the first time; then adding a dihydrazide compound, stirring for the second time to carry out a polymerization reaction, and obtaining the linear polyamide-based thiourea compound; mixing an isonitrile compound and a triamine compound, adding an organic solvent, dissolving and then adding carbon disulfide, stirring for the first time; then adding a dihydrazide compound, stirring for the second time to carry out a polymerization reaction, and obtaining the hyperbranched / cross-linked polyamide-based thiourea compound. The reaction operation of the invention is simple, can be carried out under the conditions of room temperature and air, has a high yield, and does not produce toxic and harmful byproducts; the obtained series of polyamide-based thioureas have better mechanical properties than ordinary polythioureas.

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 method for removing sulfur-containing compounds in a crude oil-prepared cracked gas C3 fraction. The method comprises the following steps: contacting the crude oil-prepared cracked gas C3 fraction with a supported desulfurizer, wherein the load type desulfurizing agent comprises a carrier and a main active component loaded on the carrier; the main active component comprises alkali metal and / or alkaline earth metal; the carrier comprises elementary substances Ag, Ag2O, elementary substances Re and ReOx; reOx is a mixture of a plurality of Re oxides, x = n / 2, and n is 4, 6 or 7; the molar content of the elementary substance Re accounts for 30-45% of the total molar weight of Re in the carrier. The method provided by the invention can effectively remove low-carbon thioether and / or low-carbon mercaptan in the C3 fraction of the crude oil-prepared pyrolysis gas, has the advantages of low removal temperature, simple process, no additional reaction, no influence on downstream hydrogenation and separation processes, and energy consumption saving, and the desulfurizer can be repeatedly regenerated and used, and has long-period stable operation capability.

The invention relates to a novel viscose fiber spinning method, and relates to the technical field of viscose fibers. The non-acidic coagulating bath is mainly composed of at least one of sodium salts. The viscose stock solution does not release hydrogen sulfide and carbon disulfide during non-acid coagulating bath spinning forming, spinning station workers and the atmospheric environment are friendly, sodium bicarbonate consumed by fiber forming can be prepared by reacting carbon dioxide with sodium carbonate, the production cost of chemical raw materials is low, the byproduct sodium carbonate generated in a coagulating bath is higher in economic value, and the production cost is low. And the fibers are uniformly formed, the orientation degree is higher, and the dimensional stability is better.

The invention discloses a quinazoline-4-one compound containing 1,2,4-triazole [3,4-b] [1,3,4] thiadiazole, a preparation method thereof and antibacterial activity thereof. The compound is represented by general formula (I), and quinazoline-4-one, 1,2-dibromoethane, methyl 4-piperidinate, 80% hydrazine hydrate, potassium hydroxide, carbon disulfide and different aromatic acids are used as raw materials to prepare the target compound through a five-step reaction. The invention introduces an active 1,2,4-triazole [3,4-b] [1,3,4] thiadiazole unit into the quinazoline-4-one structure, and synthesizes a series of quinazoline-4-one compounds containing 1,2,4-triazole [3,4-b] [1,3,4] thiadiazole units, and the compounds have good antibacterial activity.

The invention belongs to the technical field of chemical separation, and discloses a two-stage low-temperature condensation coupling compression separation high-purity hydrogen sulfide purification process and system. The system consists of a two-stage low-temperature condensation unit, a hydrogen sulfide compression unit and a hydrogen sulfide collection unit, the two-stage low-temperature condensation unit comprises a hydrogen sulfide liquid separation tank, a hydrogen sulfide low-temperature cooler, a hydrogen sulfide low-temperature liquid separation tank, a hydrogen sulfide heat exchanger and a hydrogen sulfide saline water liquid separation tank. Hydrogen sulfide raw material gas containing carbon disulfide impurities is sequentially introduced into a two-stage low-temperature condensation unit, carbon disulfide is liquefied and separated out preferentially, low-temperature water is adopted in the first stage, and materials subjected to cryogenic compression throttling are adopted in the second stage for heat exchange; pressurizing and compressing the primarily purified hydrogen sulfide gas-phase component, and then condensing and separating to remove trace carbon disulfide and recover cold energy, thereby finally obtaining the high-purity hydrogen sulfide with the purity of more than or equal to 99.95%. According to the invention, a low-temperature two-stage low-temperature condensation-pressurized compression condensation coupling separation technology is adopted, and deep removal of carbon disulfide is realized under the condition that a third component is not introduced.

The utility model provides a waste heat regulation gradient utilization system of a carbon disulfide production device, which relates to the technical field of waste heat utilization and comprises a steam lithium bromide unit, a sulfur melting unit and a carbon disulfide distillation unit. The inlet ends of the steam lithium bromide unit, the sulfur melting unit and the carbon disulfide distillation unit are communicated with the outlet end of the steam boiler through pipelines, and condensed water outlets of the steam lithium bromide unit, the sulfur melting unit and the carbon disulfide distillation unit are connected with the multi-effect mixing regulator through pipelines; the outlet end of the multi-effect mixing regulator is connected with the distributor through a pipeline, and the outlet end of the distributor is connected with the cascade heat utilization equipment through a pipeline; the condensation water heat of the steam lithium bromide unit, the sulfur melting unit and the carbon disulfide distillation unit is effectively recovered and regulated through the multi-effect mixing regulator and the distributor, so that the condensation water temperature and the hot water quantity meet the requirements of cascade heat utilization equipment, the energy consumption of low-end heat utilization equipment to steam is reduced, and the system is more energy-saving and environment-friendly and is suitable for large-scale popularization and application. And the economic benefit is improved.

The invention relates to the technical field of medicament synthesis, and particularly discloses a microreactor device for preparing liquid isopropyl xanthate, the microreactor device comprises a workbench, the top of the workbench is fixedly connected with a mixing tank through a support, and the two sides and one end of the mixing tank are communicated with feeding pipes; the end, away from the mixing tank, of the feeding pipe communicates with a discharging port of a metering pump, the bottom of the metering pump is fixedly connected with the top of the workbench, the inner wall of the mixing tank is rotationally connected with a mixing device, and the part, located below the mixing tank, of the top of the workbench is fixedly connected with a first motor. According to the microreactor device for preparing the liquid isopropyl xanthate, the mixing device is arranged, so that the mixing efficiency of isopropanol, carbon disulfide and liquid caustic soda before reaction can be improved, and the dosing mechanism is arranged, so that the mixing efficiency of isopropanol, carbon disulfide and liquid caustic soda before reaction can be improved. Therefore, the reaction efficiency of the mixed solution of isopropanol, carbon disulfide and caustic soda liquid during reaction can be improved.

Methods for producing olefins through hydrocarbon steam cracking include passing a hydrocarbon feed that includes one or more hydrocarbons to a hydrocarbon cracking unit and passing one or more sulfur-containing compounds to the hydrocarbon cracking unit. The sulfur-containing compounds include at least hydrogen sulfide gas, and a flow rate of the sulfur-containing compounds to the hydrocarbon cracking unit is sufficient to produce a molar concentration of elemental sulfur in the hydrocarbon cracking unit of from 10 ppm to 200 ppm. The methods include cracking the hydrocarbon feed in the hydrocarbon cracking unit to produce a cracker effluent and contacting the cracker effluent with a quench fluid in a quench unit to produce at least a cracked gas and a first pygas. The first pygas has a concentration of carbon disulfide less than 50 ppmw based on the total mass flow rate of the first pygas.

The present disclosure relates to a method for manufacturing a regenerated material capable of effectively utilizing carbon contained in a battery material. The method for producing a recycled material includes the following steps (a) and (b). Step (a): preparing a battery material. Step (b): carbon disulfide is generated by reacting carbon and sulfur contained in the battery material.

The invention discloses a lithium metal negative electrode with volume expansion adaptivity as well as a preparation method and application thereof, belongs to the technical field of lithium metal batteries, and provides a preparation method of the lithium metal negative electrode with volume expansion adaptivity, which comprises the following steps: soaking a carbon felt in a mixed solution of metal salt and a sulfur source, performing hydrothermal treatment, and cooling, thereby obtaining the lithium metal negative electrode with volume expansion adaptivity. Pre-treated carbon felt is obtained; washing with deionized water, and drying to obtain a sulfurized carbon felt; taking a piece of lithium foil and two pieces of carbon sulfide felts, respectively covering the upper part and the lower part of the lithium foil with the carbon sulfide felts, and rolling to obtain a carbon sulfide felt and lithium metal compound; and heating and reacting to obtain the lithium metal negative electrode. One or more sulfides grow on the commercial carbon felt, lithium metal is modified through simple rolling, the lithium metal electrode is obtained, the strength of the electrode is higher than that of the lithium metal, and the electrode has good mechanical performance; the phenomena of non-uniform deposition and dendritic crystal growth of lithium metal are retarded, and the volume expansion self-adaptive capacity of the battery is improved.

The invention relates to the technical field of viscose staple fiber processing, in particular to a viscose staple fiber cooking device which comprises a fiber feeding groove frame, a dispersing groove and a cooking groove are formed above the fiber feeding groove frame, the connecting position of the dispersing groove and the cooking groove is through, a dispersing guide plate and a distribution assembly are arranged in the dispersing groove, and the dispersing guide plate is connected with the cooking groove. The device has the beneficial effects that the dispersing tank and the cooking tank are designed, viscose staple fibers are cooked through steam, the fibers are carded in the cooking process in cooperation with the fixing frame, meanwhile, the broken staple fibers are intercepted, blockage and accumulation are avoided, the fibers can be fully cooked and loosened through sprayed steam, residual CS2 is fully cooked and removed, and the quality of the viscose staple fibers is improved. And the space above the cooking tank is covered by the steam rising area sealing cover, and rising steam carrying carbon disulfide can be connected with a condensation recovery separation workshop through a carbon disulfide recovery pipe, so that the carbon disulfide is effectively recovered, the environmental pollution is reduced, and the resource utilization rate is improved.

The utility model provides a carbon disulfide cooling system. The carbon disulfide cooling system comprises a first-stage condenser, a second-stage condenser and a third-stage condenser which are arranged at the gas phase outlet end of a sulfur and carbon catcher. The liquid phase output ends of the first-stage condenser and the second-stage condenser are connected with a crude carbon disulfide buffer tank, and the liquid phase output end of the third-stage condenser is connected with a reflux buffer tank. The output end of the reflux buffer tank is connected with a sulfur capture reflux pump, and the sulfur capture reflux pump is connected with the liquid phase input end of the sulfur and carbon capture device through a reflux pipeline. And the outlet end of the crude carbon disulfide buffer tank is provided with a liquid phase recovery pipeline communicated with the separation tower. A material inlet is formed in the side part of the sulfur and carbon capturing device, and external mixed gas enters from the material inlet. A material outlet is also formed in the bottom of the sulfur and carbon capturing device and is used for discharging excessive sulfur. According to the utility model, the energy consumption of the refrigerating machine required by the subsequent three-stage condenser is reduced, the temperature of the gas phase outlet of the sulfur and carbon capturing device is also reduced, and the cooling recovery of CS2 is more facilitated.

A method for producing sulfurizcd-carbon cathode materials for electrochemical cells involves mixing carbon nanofibers, sulfur, and a monomer (e.g., acrylonitrile) to form a mixture, polymerizing the monomer to encapsulate the nanofibers and sulfur within a polymer matrix (e.g., polyacrylonitrile), and pyrolyzing the matrix to chemically bond carbon from the polymer to the nanofibers and sulfur, yielding sulfurized-carbon particles fused to the nanofibers. The pyrolyzed material forms a fluffy powder that is compressed into a free-standing dry film, wherein the nanofibers and longer nanofiber yarns create a three-dimensional conductive network enhancing mechanical stability and electrical conductivity. The film is laminated to a current collector to form a cathode. Optional pore- loading with molecular sulfur improves capacity and cycle life, achieving >70% sulfur utilization without wet processing solvents.

The invention relates to a preparation method of a zinc sulfate carbon sulfide material and application of the zinc sulfate carbon sulfide material as an oxygen electrocatalyst carrier. The preparation method comprises the following steps: firstly, preparing an ink dispersion liquid of a carbon material through a water milling method by utilizing the characteristics of good water solubility and high-temperature easy decomposition of zinc sulfate, and then carrying out high-temperature treatment to obtain a carbon sulfide material; experiments show that the sulfuration method not only can effectively dope sulfur element, but also can increase the specific surface area and porosity of the carbon material, and can be applied to various carbon materials. The sulfurized carbon material can be used as an oxygen electrocatalyst carrier, and shows better activity and stability than an unsulfurized carbon carrier. After the carbon material SVDCS prepared by the method is compounded with iron phthalocyanine (FePc), the obtained catalyst FePc / SVDCS has excellent oxygen reduction activity and stability, the half-wave potential is 0.91 V which is 70 mV higher than that of a commercial Pt / C catalyst, and the catalyst FePc / SVDCS has better stability, which shows that the carbon sulfide material has a good application prospect in the field of oxygen electrocatalyst carriers.

The application relates to a method for continuously producing alkyl xanthate, belonging to the field of alkyl xanthate production, and comprising the following steps: step one: adding cyclohexane and organic alcohol into a solid-liquid mixer in proportion; step two: adding solid alkali into the solid-liquid mixer and crushing and stirring by using an emulsifying machine; step three: continuously adding carbon disulfide into a dynamic tubular reactor by using a precision metering plunger pump, and after the reaction is completed, the slurry is discharged from a dynamic tubular reactor discharge port into a slurry storage tank; and step four: the slurry is sequentially transported to a vacuum spray drying system by using a screw pump, and after drying, alkyl xanthate is obtained. The application uses a dynamic tubular reactor to synthesize alkyl xanthate, the solid alkali is easy to ionize, and after ionization, the solid alkali collides with organic alcohol, carbon disulfide and an organic solvent to react, and the nucleophilic reaction rate is accelerated.

The present application pertains to a method of making carbon disulfide. The method comprises reacting methane and sulfur under conditions sufficient to produce carbon disulfide, hydrogen disulfide, and heat. At least a portion of the produced hydrogen disulfide is reacted with methane under conditions sufficient to produce a mixture comprising carbon disulfide and hydrogen. Advantageously, at least a portion of the heat from reacting methane and sulfur is employed in the reacting of at least a portion of the produced hydrogen disulfide with methane.

The utility model provides a production device for synthesizing TBTD in one step, which comprises a reaction kettle, a di-n-butylamine adding pipeline, a hydrogen peroxide adding pipeline, a carbon disulfide adding pipeline, a soft water adding pipeline, a carbon disulfide gas discharging pipeline and a nitrogen pipeline are arranged at the top end of the reaction kettle, and the carbon disulfide gas discharging pipeline is connected with a gas inlet of a condenser. A condensate outlet pipeline of the condenser is connected with a carbon disulfide receiving tank, a bottom outlet pipeline of the carbon disulfide receiving tank is connected with a carbon disulfide adding pipeline, and the carbon disulfide adding pipeline is further connected with a carbon disulfide transfer pump; hydrogen peroxide is adopted as an oxidizing agent, so that high-salinity wastewater discharge is reduced; the reaction liquid is washed with water for many times to remove residual alkali liquor and byproducts, water is used as a solvent to replace a traditional methanol / ethanol system, and emission of VOCs is reduced; the metering pump is used for dropwise adding materials, so that automatic sealing feeding is realized, and harm to bodies of workers is reduced; carbon disulfide is recycled for next reaction, so that the material loss is reduced, and the pollution problem in the subsequent treatment process is reduced.

This invention relates to the field of phosphogypsum resource utilization, specifically disclosing a method for preparing light calcium carbonate and co-producing sulfuric acid by decomposing phosphogypsum. The method includes the following steps: adding a deagglomerating agent to phosphogypsum, followed by flotation and water washing to obtain purified phosphogypsum; drying and heating the purified phosphogypsum in a preheating furnace; mixing the dried phosphogypsum with carbon sulfide and adding it to a first-stage airlift circulating reactor, while introducing sulfur gas; conveying the reacted material to a second-stage airlift circulating reactor, where the reaction yields calcium oxide and a mixture of sulfur dioxide and carbon dioxide; catalytically oxidizing and absorbing the carbon dioxide mixture to obtain sulfuric acid and carbon dioxide gas; dissolving calcium oxide in water and introducing carbon dioxide gas to obtain a calcium carbonate suspension; filtering and drying the calcium carbonate suspension to obtain light calcium carbonate. This invention solves the problems of low purity and high decomposition temperature of calcium oxide products in existing technologies, achieving closed-loop material circulation and full component utilization.

The invention discloses a star-shaped block copolymer for low-rank coal slurry and a preparation method thereof. The method comprises the following steps: uniformly mixing tripotassium phosphate, 1-butyl mercaptan, carbon disulfide and acetone, heating the mixture to room temperature and keeping the temperature, adding 1,3,5-tri(bromomethyl)benzene at 5 to 0°C, stirring the mixture, heating the mixture to room temperature and keeping the temperature, separating the product to obtain an intermediate product I; subjecting the intermediate product I, an initiator, styrene and dioxane to a RAFT controlled radical polymerization reaction under vacuum, and then removing unreacted monomers to obtain M n =10000-20000 intermediate product II; the intermediate product II, initiator, methoxy polyethylene glycol acrylate and dioxane are subjected to RAFT controlled radical polymerization under vacuum, and then the unreacted monomer is removed to obtain M n = Star-shaped block copolymer with a molecular weight of 20,000 to 40,000.