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284 results about "Carbon sulfide" patented technology
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Carbon sulfide may refer to: Carbon disulfide Carbon monosulfide Carbon subsulfide
Absorption-biological treatment method for malodorous gas
The invention relates to an absorption and biological treatment method of malodorous waste gas. The malodorous waste gas enters a spray absorption tower to have an absorbing, humidifying and cooling function, and then enters into a biological dripping and filtrating device and contacts with a biological film attached to the surface of the filler in the process of rising to be degraded into odorless compounds, and then the purified gas is discharged. The residence time of a vacant bed is 11 to 45 seconds. Part of the waste water produced when spraying and absorbing can be used as biological circulating water, which can be reused again as spraying water after the biochemical treatment. The absorption and biological treatment method of the invention can effectively remove the odor polluting matters such as organic amine, ammonia gas, hydrogen sulfide, mercaptan type, dimethyl sulfide (DMS), dimethyl disulfide (DMDS), styrene, volatile organic compounds (VOC), dimethyl trisulfide, benzylamine, carbon disulfide, carbonyl sulfide, etc. and all kinds of malodorous smells, most of which are poisonous and a plurality of which are carcinogens. The deodorization effect can reach 99 percent, which can discharge by reaching the standard and can be applied to a deodorization and purification treatment of the large-capacity matters polluted by different malodorous gas with low concentration.
Owner:SUN YAT SEN UNIV
Lignin-based dithiocarbamate heavy metal ion capture agent and preparation method
InactiveCN102784622AReduce manufacturing costThe synthesis method is simpleOther chemical processesWater/sewage treatment by sorptionAminationDithiocarbamate
The invention discloses a preparation method of a lignin-based dithiocarbamate heavy metal ion capture agent. The method comprises the steps of: (1) adding water into lignin and stirring them, adding an alkaline conditioning agent to adjust the pH to 9-11, then adding an oxidizing agent, conducting heating to raise the temperature to 80-90DEG C for reacting for 1-2 hours; (2) adding an amination reagent, maintaining the reaction temperature at 80-90DEG C, then adding formaldehyde to react for 5-6 hours; (3) cooling the solution to room temperature, adjusting the pH value to 10-11, then adding carbon disulfide to perform an esterification reaction for 4-5 hours at 40-45DEG C; and (4) adding a modifier for reacting for 1-2 hours, then carrying out pumping filtration, and then conducting washing 2-3 times with water and absolute ethyl alcohol, thus obtaining a solid product, i.e. the lignin-based dithiocarbamate. The lignin-based dithiocarbamate heavy metal ion capture agent provided in the invention has the advantages of simple preparation process, low production cost, excellent performance, adaptability to treatment of various heavy metal ion polluted wastewater, good stability, and wide applicable range.
Owner:GUANGXI UNIV
A preparation method of a sulfur-supported graphene aerogel composite material
InactiveCN103996830ASimple processShort preparation cycleCell electrodesSecondary cellsLithium-ion batteryPolymer
The invention relates to a preparation method of a sulfur-supported graphene aerogel composite material, and belongs to the technical field of lithium ion battery cathode materials. The preparation method mainly includes steps of: subjecting a graphene oxide dispersion liquid, ethanol and sulfur / carbon disulfide which are main raw materials to a hydrothermal reaction at 100-200 DEG C for 6-48 h to obtain sulfur-supported graphene aerogel, and obtaining the sulfur-supported graphene aerogel composite material covered by a polymer through a chemical oxidation method. According to a sulfur-supported graphene aerogel cathode prepared by the preparation method, graphene is staggered and connected to form a three-dimensional conductive network, the supramaximal surface area can absorb more sulfur, and covering by the polymer can overcome a problem of volume expansion of sulphur and a problem of material smashing in charge-discharge processes. In addition, the composite material prepared by the preparation method can be directly used as a pole piece, thus omitting tedious processes, such as pulping and coating in traditional electrode preparation. The preparation method is prone to industrial production.
Owner:SHANGHAI UNIV
Lead paste of deep adhesive type specially-cured lead carbon battery
ActiveCN106129357AControl stratification problemHigh strengthLead-acid accumulatorsCell electrodesCapacitanceFiber
The invention relates to lead paste of a deep adhesive type specially-cured lead carbon battery. Positive electrode lead paste comprises the following constituents: 600-1,200kg of lead powder, 5-80kg of red lead, 10-60kg of 4BS seed crystal, 0.6-3.6kg of aquadag, 0.3-3.6kg of stannous sulfate, 0-3.0kg of antimonous oxide, 0.6-3.6kg of potassium phosphate, 0.5-1.8kg of fumed silica, 0.8-1.8kg of short fiber and 48-130kg of 1.40g / ml dilute sulphuric acid, and negative electrode lead paste comprises the following constituents: 600-1,000kg of lead powder, 3-12kg of barium sulfate, 1-8kg of humic acid, 0.5-2.5kg of lignin, 0.3-1.8kg of fumed silica, 0.05-1.5kg of sodium carboxymethyl cellulose (CMC), 0.5-2.5kg of PTFE emulsion, 8-10kg of graphite, 1-16kg of acetylene black / carbon black, 2-18kg of active carbon / capacitance carbon / carbon, 0.05-1.8kg of bismuth oxide / bismuth carbon sulfide bismuth, 0.01-1.2kg of graphene, 0.02-2.0kg of carbon nanofiber tube, 0.8-1.8kg of short fiber and 76-80kg of 1.40g / ml dilute sulphuric acid.
Owner:ANHUI HONGDA ELECTRICAL SOURCE
Rhodococcus ruber and application thereof in degradation of organic pollutants
The invention discloses rhodococcus ruber FQ-2 and an application thereof in degradation of acetone and other common industrial organic pollutants. The application method comprises the steps: an inorganic salt culture medium containing acetone and other common industrial pollutants is inoculated with the rhodococcus ruber FQ-2, a degradation reaction is carried out under the conditions of the temperature of 30 DEG C and the rotating speed of 160 r / min, and thus the organic pollutants are degraded; the common organic pollutants comprise acetone, n-hexane, carbon disulfide, chlorobenzene, butylacetate, ethyl acetate or alpha-pinene. The rhodococcus ruber FQ-2 is taken from activated sludge of an aeration tank of a pharmaceutical factory in Zhejiang province, has good degradation effect on VOCs organic pollutants, especially acetone, and can completely convert acetone into harmless substances such as CO2, H2O, cell biomass and the like; at the same time, the bacterial strain also can degrade common industrial pollutants such as carbon disulfide and chlorobenzene in different extent, so the bacterial strain has broad application prospects in biological purification of industrial wastegas and wastewater.
Owner:ZHEJIANG UNIV OF TECH
Preparation method of modified bio-charcoal based catalyst
InactiveCN104772146AImprove removal effectFully removedDispersed particle separationMetal/metal-oxides/metal-hydroxide catalystsPtru catalystCarbonyl sulfide
Owner:KUNMING UNIV OF SCI & TECH
Beneficiation reagent and method for separating scheelite from complex tungsten ore
The invention relates to a beneficiation reagent and a method for separating scheelite from complex tungsten ore; the beneficiation reagent adopts oxidized paraffin soap, kerosene, butyl xanthate, dithiophosphate BA as collectors, adopts sodium carbonate as modifier and terpenic oil as foaming agent, and also adopts one or the combination of Sodium silicate and ferrous sulfate or aluminum sulfate as inhibitor; the method employing the beneficiation reagent for separating scheelite from complex tungsten ore includes: desliming in normal temperature, carbon-sulfide bulk rough floatation, secondary tungsten rough floatation and quintic tungsten concentration, so tailings and tungsten concentrate product are obtained; besides, the invention has the advantages of high sorting efficiency, high yield rate, wide reagent resource, low price, low cost and dosage, simple and reliable process, easy operation and normal temperature working, and is particularly applicable to the beneficiation application of complex tungsten ores.
Owner:ZIJIN MINING GROUP
Carbon disulfide reacting furnace
The invention discloses a carbon disulfide reacting furnace. The carbon disulfide reacting furnace comprises a furnace body (03), a reaction chamber (04), a furnace bottom (30), a discharge port (01) and a slag notch (20), wherein a vertical central heating chamber (60) is arranged on the central part of the reaction chamber (04), the central heating chamber (60) comprises an air inlet (61) and a smoke outlet (63); a heater (62) is arranged inside the central heating chamber (60); and at least two feeding ports (02) are arranged on the upper part of the reaction chamber (04) and are circled on the surrounding of the central heating chamber (60). Compared with the prior art, the volume of the reaction chamber can be greatly increased, so that the production capacity of a single device can be greatly increased, the production efficiency is improved and the energy consumption is greatly reduced.
Owner:濮阳天泓实业有限公司
Clay-based xanthogenate, and preparation method and application thereof
InactiveCN102463104ARich reservesSimple processing technologyOther chemical processesWater/sewage treatment by flocculation/precipitationSoil remediationGraft reaction
The invention belongs to chemical materials and mainly relates to clay-based xanthogenate, and a preparation method and application thereof. The invention provides a clay-based xanthogenate compound. The other purpose of the invention is to provide the preparation method and the application of the clay-based xanthogenate. The clay-based xanthogenate compound and the preparation method thereof are characterized in that the compound is formed by alkalifying various mineral clays and then carrying out modifying or grafting reaction by adding carbon disulfide; and the method is simple, strong in operability, low in cost and easy for large-scale production, popularization and application. More particularly, the clay-based xanthogenate compound provided by the invention can be used as novel high-efficient heavy metal ion coagulant and can be applied in the fields, such as waste water treatment, soil remediation, wet-process metallurgy, environmental protection, ecological construction and the like, thus, the clay-based xanthogenate compound has the characteristics of simple and easy operation, rapidness, convenience, high metallic ion removing rate, easy solid-liquid separation and the like. The clay-based xanthogenate compound is an environment-friendly functional material and also has a wide application prospect in other fields.
Owner:王永斌
Preparation method and application of FeS2/g-C3N4 heterojunction material
ActiveCN110075896AReduce raw material costsThe preparation process is environmentally friendly and pollution-freePhysical/chemical process catalystsWater/sewage treatment by irradiationCarbon disulfideMuffle furnace
The invention discloses a preparation method and an application of a FeS2 / g-C3N4 heterojunction material. The preparation method comprises steps as follows: melamine is added to a tubular furnace andcalcined, and g-C3N4 is prepared; besides, FeSO4.7H2O, Na2S2O3.5H2O, powdered sulfur and deionized water are added to a reaction kettle and subjected to a hydrothermal reaction, FeS2 is prepared, theproduct is repeatedly washed with dilute sulfuric acid, carbon disulfide and deionized water, finally, g-C3N4 and FeS2 in a certain ratio are dissolved in a methanol solution, the mixed solution is subjected to ultrasonic bath, water-bath heating is performed to volatilize methanol, an obtained product is calcined in a muffle furnace, and the FeS2 / g-C3N4 heterojunction material can be prepared. The preparation method has a simple process and is pollution-free, low in manufacturing cost and environmentally friendly, and a prepared composite catalyst has a good treatment effect.
Owner:CHONGQING UNIV
Novel synthetic heavy metal chelating agent
The invention belongs to the technical field of harmless treatment of municipal solid waste incineration fly ash, and solves the solidification problem of heavy metal ions in fly ash. A method for preparing a novel synthetic heavy metal chelating agent comprises the following steps: mixing a polyethyleneimine water solution with a sodium hydroxide water solution, and dropwise adding carbon disulfide to obtain an orange red jelly-like solid, namely the heavy metal chelating agent. The method is simple in process, low in cost, easy and convenient to operate, wide in application range, low in environmental pollution and suitable for industrialized production.
Owner:SICHUAN UNIV
Preparation method for adsorption material for polluted water heavy metals and treatment method for polluted water heavy metals
InactiveCN103447005AImprove adsorption capacityEasy to handleOther chemical processesWater contaminantsEpoxyAdsorption effect
The invention discloses a preparation method for an adsorption material for polluted water heavy metals and a treatment method for polluted water heavy metals. The adsorption material for polluted water heavy metals is obtained by directly using maize straw as a raw material, and performing an xanthogenate modification treatment on the raw material by sodium hydroxide, epoxy chloropropane, carbon disulfide, magnesium sulphate and the like. The adsorption material prepared by the method disclosed by the invention is used for treating heavy-metal polluted water, and suitable for the conditions of neutral and acidic water environments; the adsorption material is low in dosage, high in removal rate, and capable of obtaining a good adsorption effect. The preparation method and the treatment method disclosed by the invention provide a new way for effective utilization for maize straw.
Owner:SOUTH CHINA NORMAL UNIVERSITY +1
2-mercapto benzothiazole derivative synthetic method with copper-catalyzed carbon disulfide
InactiveCN104098528ANo pollution in the processSave raw materialsOrganic chemistryRecreationMetallic sulfide
The invention relates to the technical field of agriculture, industry and pharmacy and provides a 2-mercapto benzothiazole derivative synthetic method. According to the 2-mercapto benzothiazole derivative synthetic method, 2-mercapto benzothiazole derivatives are synthesized by take 2-halogen phenylamine, carbon disulfide and inorganic metal sulfide as the raw materials and through catalysis of copper salt. The method comprises dissolving the 2-halogen phenylamine, the inorganic metal sulfide and copper salt catalyst inside an appropriate solvent, adding the carbon disulfide inside the mixture for recreation under 50-110 DEG C for a certain time and performing purification treatment to obtain the 2-mercapto benzothiazole derivatives. The 2-mercapto benzothiazole derivative synthetic method with the copper-catalyzed carbon disulfide is rapid and efficiency, by taking the nontoxic, cheap and easily-obtained copper salt as the catalyst, omits ligand for recreations, and has the advantages of being high in yield rate, mild in conditions, low in the amount of by-products and the like.
Owner:INNER MONGOLIA UNIV OF TECH
Wide-range spectral absorption perovskite photovoltaic material and preparation method thereof
ActiveCN105514277AIncrease contact areaImprove separation efficiencySolid-state devicesSemiconductor/solid-state device manufacturingCarbon disulfideSpectral absorption
The invention discloses a wide-range spectral absorption perovskite photovoltaic material and a preparation method thereof. The method comprises the following steps: adding additives to a perovskite reactant to form an inorganic particle hybrid perovskite precursor solution; and then, spin-coating a substrate covered with an electron transport material with the precursor solution, and forming a composite perovskite light absorption layer film after heat treatment at 150 DEG C, wherein the additives include halide, carbon disulfide, zirconium oxide nanoparticles and hexyl amine. In the scheme, the light absorption layer of the perovskite solar cell is a perovskite light absorption layer doped with a nanometer cuprous sulfide or stannous sulfide material generated by chemical reaction and the zirconium oxide nanoparticles, and therefore, the light absorption range of the perovskite layer is expanded, and the battery efficiency is increased from 6% to more than 10%. The method is simple, effective and cost-saving. Therefore, the method for improving the performance of the light absorption layer of the perovskite solar cell is of very high industrial application value.
Owner:ANHUI HUASUN ENERGY CO LTD
Process for producing benzene, methylbenzene and xylene from crude benzene
InactiveCN104692995AMeet needsReduce processing costsDistillation purification/separationHydrocarbonsAlkaneUnsaturated hydrocarbon
The invention discloses a process for producing benzene, methylbenzene and xylene from crude benzene. Various impurities, mainly containing thiophene, in the crude benzene are all removed by use of a low-temperature hydrogenation method, wherein all the sulfides (such as thiophene, methylthiophene and carbon disulfide) are converted into H2S and low carbon hydrocarbons, the nitrides are converted into NH3 and arenes or alkanes, the oxides are converted into H2O and arenes or alkanes, and the unsaturated hydrocarbons are saturated by hydrogenation; and next, the impurities are removed by virtue of conventional rectification and extraction rectification. As a result, the benzene, the methylbenzene and the xylene all having good quality can be produced.
Owner:ZHANHUA YUKAI NEW MATERIAL TECH
Processes for converting hydrogen sulfide to carbon disulfide
Processes for forming carbon disulfide from a gas stream containing hydrogen sulfide. A gaseous stream comprising lower molecular weight alkanes and hydrogen sulfide may be contacted with sufficient bromine at a temperature of from about 250° C. to about 530° C. to convert substantially all of said hydrogen sulfide to carbon disulfide. The gaseous stream may contain from about 0.001 to about 20 mol % hydrogen sulfide. The molar ratio of bromine to hydrogen sulfide may be about 2:1.
Owner:GTC TECHNOLOGY US LLC
Method for preparing dithiocarbamates in particular from polyols of the glycerol type
The present invention concerns a method for the synthesis of glycerol dithiocarbamates or bis-dithiocarbamates (GDTCs) in which a reaction medium comprising (1) a carbonate selected from diethyl carbonate, dimethyl carbonate and ethylene or propylene carbonate associated with a glycerol type polyol in the presence of a basic catalyst or (2) a cyclic carbonate comprising five ring members, in a solvent medium, is supplemented with a primary or secondary amine in the presence of carbon disulphide, and the GDTC formed is recovered. In particular, a glycerol type polyol is brought into the presence of diethyl carbonate in the presence of a catalyst, then a primary or secondary amine is added to the reaction medium in the presence of carbon disulphide, and the GDTC formed is recovered. The invention can be used for one-step synthesis of glycerol dithiocarbamates directly from glycerol as the starting material and solvent. This method involves glycerol, diethyl carbonate, carbon disulphide (CS2) and a primary or secondary amine to produce glycerol dithiocarbamates; the glycerol / NaOH phase can be recycled 6 times without a noticeable drop in yield; the ethyl acetate is also recycled after each extraction.
Owner:CENT NAT DE LA RECHERCHE SCI +1
High-molecular organic-inorganic composite chemical for processing incineration fly ash and application thereof
The invention discloses a high-molecular organic-inorganic composite chemical for processing incineration fly ash and an application thereof. An organic substance part of the composite chemical is a high-molecular metal ion chelating agent composed of acrylamide, hydroxyl acrylic acid, chloropropylene oxide, an amines and carbon disulfide through polymerization, and an inorganic substance part is mainly composed of composite phosphate. According to the invention, functional groups of polyacrylamide and dithio amino are integrated in the composite chemical, the composite chemical has dual efficacy for chelating and flocculating heavy metal ions, and the capability of chelating metal ions in the fly ash can be obviously increased by compounding with inorganic salt; 18mL of the composite chemical is added in each kilogram of fly ash to reach the treatment requirement of fly ash under a new standard; compared with pure organic chemical, the production cost is greatly reduced, the preparation method is simple, the raw material has the advantages of low cost, and easy acquisition, and the high-molecular organic-inorganic composite chemical is in favor of popularization and application.
Owner:南京卓越环保科技有限公司
Preparation method for Cu-Co-S-MOF nanosheet and application thereof
ActiveCN110428976AImprove conductivityImprove redox performanceMaterial nanotechnologyHybrid capacitor electrodesCopper nitrateCobalt(II) nitrate
The invention relates to a preparation method for a Cu-Co-S-MOF nanosheet, which comprises the following steps: S1, cobalt nitrate hexahydrate is dissolved in deionized water to obtain a solution A, 2-methylimidazole is dissolved in deionized water to obtain a solution B, the solution A and the solution B are mixed, clean foamed nickel is then added for reaction, and foamed nickel with Co-MOF is obtained; S2, copper nitrate hexahydrate and the cobalt nitrate hexahydrate are dissolved in isopropanol, a mixed solution C is obtained after dissolution, and carbon disulfide and pentamethyldiethylenetriamine are added to the mixed solution C, and a mixed solution D is obtained; and S3, the foamed nickel with Co-MOF is added to the mixed solution D and is transferred to a reactor for a hydrothermal reaction, and after the reaction, the Cu-Co-S-MOF nanosheet is obtained. Compared with the prior art, the preparation method is environmentally-friendly, the preparation method is simple, large-scale production is facilitated, the obtained Cu-Co-S-MOF nanosheet can be applied to an electrode material, and excellent electrochemical performance can be obtained.
Owner:SHANGHAI INSTITUTE OF TECHNOLOGY
Preparation method for cobalt sulfide/carbon composite material and product and application therefor
ActiveCN105719846AOvercome conductivityOvercoming the low specific capacitanceHybrid capacitor electrodesHybrid/EDL manufactureCarbon compositesReaction temperature
The invention provides a preparation method for a cobalt sulfide / carbon composite material and a product and an application therefor. The preparation method comprises the following steps of: S1, enabling a soluble cobalt salt to be mixed with carbon disulfide (CS<2>) to obtain a uniform solution, wherein the ratio of the amount of substance of the soluble cobalt salt to carbon disulfide (CS<2>) is 1:1-1.5; S2, moving the solution obtained in the step S1 to a reaction kettle to be subjected to a solvothermal reaction, wherein the conditions of the solvothermal reaction are as follows: the reaction temperature is 180-220 DEG C and the reaction time is 20-24h; and S3, separating the mixture obtained in the step S2, collecting a solid product, and washing and drying the solid product to obtain the cobalt sulfide / carbon composite material. According to the preparation method, carbon disulfide is skillfully taken as the raw material; the carbon disulfide can be used as the solvent, the sulfur source and the carbon source in the solvothermal reaction; the preparation method is simple, easy to operate and low in equipment requirement; and in addition, the cobalt sulfide / carbon composite material has relatively high specific capacitance and cycling stability and low capacitance degradation.
Owner:LINGNAN NORMAL UNIV
Apparatus and method for recovering carbon disulfide in hydrogen sulfide gas during preparing process of carbon disulfide
The invention discloses a recycling equipment and method of carbon disulfide in the hydrogen sulfide, which is characterized by the following: injecting hydrogen sulfide with carbon disulfide in the Claus recycling system directly; maintaining inner catalyst active property in the Claus reactor; sending the hydrogen sulfide with carbon disulfide in the adsorbing reactor to proceed adsorb and desorb operations alternately; transmitting the desorbed carbon disulfide in the refining unit to recycle carbon disulfide.
Owner:孔庆然
Method for treating waste gas containing hydrogen sulfide and carbon disulfide and corresponding device of method
InactiveCN104474875AEmission reductionZero emissionDispersed particle separationMercury compoundsCinnabarIncineration
The invention relates to a method for treating a waste gas containing hydrogen sulfide and carbon disulfide. According to the method disclosed by the invention, sulfur elements form precipitates by adopting a precipitation method, and lattice conversion is carried out on the precipitates in a liquid phase to enable the precipitates to be converted to cinnabars with a certain economical value, so that incineration of the traditional process and the extra treatment process are avoided.
Owner:巨野县鑫源化工有限公司
Regeneration method after deactivation of carbon disulfide hydrolysis catalyst
InactiveCN102500429ALow costHigh activityDispersed particle separationCatalyst regeneration/reactivationActivated carbonPtru catalyst
The invention discloses a regeneration method after the deactivation of a carbon disulfide hydrolysis catalyst, i.e. a regeneration method after the deactivation of the carbon disulfide hydrolysis catalyst through taking activated carbon as a carrier. The regeneration method comprises the following steps of: washing the deactivated catalyst for 3-4 times with distilled water, drying for 3-4h at a temperature of 100-120 DEG C, then placing into an impregnant for ultrasonic impregnation for 30-60 minutes and finally drying for 3-4h at a temperature of 100-120 DEG C to obtain a regenerated catalyst. The regeneration method has the beneficial effects that the operation is simple, and the impregnation process is easy for operation; moreover, the impregnant is cheap, is easily obtained and easily realizes the industrialization; and the regenerated catalyst is high and is superior to a fresh catalyst in activity and can be widely applied to the removal of carbon disulfide in various gas sources.
Owner:KUNMING UNIV OF SCI & TECH
Iron ion removing method from aluminum sulfate
The invention relates to an organic complexometry process for removing iron ions in aluminum sulfate comprising the steps of, charging 15% KOH solution into a diamine group compound, cooling down to 5-12 deg. C, dropping carbon sulfide, lifting the reaction solution temperature for continuous reaction 0.5-1 hours to obtain water solution with concentration of settling agents being 30%, charging the product yield into a definite quantity of aluminum sulfate mother liquid, agitating, complexing with ferrum ions to produce water-fast brownish-black organic complex-precipitation article, low ferrum or ferrum-free aluminum sulfate can be obtained through filtering and concentration.
Owner:WUHAN CHEM COLLEGE
Method for recovering carbon sulfide and hydrogen in separation mode
InactiveCN104457138AReduce energy consumptionEfficient separationNitrogen purification/separationSolidificationVapor–liquid separatorEngineering
Owner:江西恒兴源化工有限公司
Synthetic method of high-purity solid sodium dimethyl dithiocarbamate
ActiveCN103819375APromote precipitationQuick responseOrganic chemistryPhysical chemistryCarbon sulfide
The invention provides a synthetic method of high-purity solid sodium dimethyl dithiocarbamate, which comprises the steps that softened water is added to a synthetic kettle and stirred; solid sodium hydroxide is added; the temperature of a material in the kettle is controlled to be 10-25 DEG C after solid sodium hydroxide is fully dissolved; carbon disulfide is pressed into a carbon disulfide head tank from a storage tank via nitrogen; dimethylamine is filled from the bottom of the synthetic kettle; carbon disulfide is added from the upper part of the synthetic kettle; stirring is performed via a stirrer; carbon disulfide and dimethylamine are added to the synthetic kettle within 80-120min; the stirrer is controlled to stir for continuous reaction after carbon disulfide and dimethylamine are fully added; the material in the synthetic kettle is put into a vacuum suction filter; a vacuum injection pump is started for vacuumizing; the vacuum degree is kept to be 0.07-0.09MPa; and solid sodium dimethyl dithiocarbamate is obtained. The method has the advantages that the method is high in purity and low in production cost; the content of dimethylamine in a mother solution can be reduced; and a working environment is improved.
Owner:YANTAI ZHONGKE RONGDA NEW MATERIAL CO LTD
Process for preparing dazomet dustless stable fine granule
InactiveCN1543787AHigh reaction yieldHigh yieldBiocideAnimal repellantsReaction temperatureCarbon sulfide
A process for preparing dazomet dust free stabilized fine granules from methylamine and carbon sulfide as raw material through the steps of, diluting methylamine with water in reactor, agitating, dropping carbon sulfide and controlling reaction temperature, continuing stirring 1-2h, stewing to obtain oil layer, thus the intermediate compound N-methyl dithiocarbamic acid is prepared, adding into reactor in turn the intermediate compound N-methyl dithiocarbamic acid prepared in the previous step and the water solution of soluble macromolecular compound, surface active agent, stirring, dropping formaldehyde solution and controlling reaction temperature, stewing for filtering, thus dazomet fine granule with 100 mesh average grain diameter can be prepared by drying the filter cake.
Owner:SHANGHAI JIAO TONG UNIV
Method for continuously producing rare-earth sulfide coloring agent in large scale
InactiveCN109929269AImprove performanceImprove temperature resistancePigment physical treatmentPigment treatment with non-polymer organic compoundsSolid carbonPhosphate
The invention relates to a method for continuously producing a rare-earth sulfide coloring agent in a large scale. The method comprises the following steps: firstly, adopting a rare-earth compound, sulfur, an alkali metal compound, solid carbon and a fluoride in a suitable weight ratio for roasting reaction at 800-1500 DEG C to prepare a rare-earth sulfide coloring agent primary product; then adding one or more of stearate, phosphate, oxalate, an aluminum salt, silicate, a zirconium source and ammonia water into the rare-earth sulfide coloring agent primary product for washing for several hours, and performing spray drying to finally prepare the rare-earth sulfide coloring agent; the product performance of the finally prepared rare-earth sulfide coloring agent is stable, and the temperature resistance, the acid resistance, the weather resistance and the chromaticity are obviously improved. The method disclosed by the invention has the advantages that the operation is simple, the cost is low, poisonous and harmful gases such as hydrogen sulfide and carbon sulfide are not used in the production process, and the production efficiency is high.
Owner:包头中科世纪科技有限责任公司
Method for preparing dangerous heavy metal removing agent in electroplating wastewater and application thereof
ActiveCN103030205AImprove precipitation effectPrecipitation effect is thoroughWater/sewage treatmentEpoxyChemical engineering
The invention discloses a method for preparing a dangerous heavy metal removing agent in electroplating wastewater and application thereof. The method comprises the following steps of: 1), fully reacting tetraethylenepentamine and carbon disulfide under an alkaline environment; and 2), adding epoxy chloropropane into a reactive product in the step 1) to fully react, and finally, blowing away redundant carbon disulfide by nitrogen, wherein the mass ratio of tetraethylenepentamine and carbon disulfide is 1 to (1.8-3.2), and the mass ratio of carbon disulfide and epoxy chloropropane is 1 to (7.5-10). The dangerous heavy metal removing agent is wide in application range, has a good deposition effect, and is completely deposited and dosage-type; heavy metal ions can be separated out without adding other auxiliary flocculating agents, and secondary pollution is avoided; the method is easy in using method, low in cost, simple in preparation process and easy to operate; hexavalent chromium can be directly reduced into trivalent chromium; the trivalent chromium is removed in a complexing mode; and a chromium breaking agent is not needed to be added.
Owner:增城市高新双江净水剂有限公司
Pomelo peel adsorbent modified with sulfo carbamates and preparation method of pomelo peel adsorbent
InactiveCN104923168AAchieve sustainable developmentReduce manufacturing costOther chemical processesChemical industryCarbamate
The invention discloses a pomelo peel adsorbent modified with sulfo carbamates, and a preparation method of the pomelo peel adsorbent, and belongs to the field of chemical industry. The pomelo peel adsorbent comprises the components of pomelo peel powder, amine-group compounds, carbon disulfide and an organic solvent, wherein, the amine-group compounds can be one or more kinds of antifebrin, triethanolamine, isopropyl alcohol, aniline and the like; the organic solvent is an alcohol solvent. The adsorbent can be used for removing heavy metal ions comprising Cu2+, Pb2+, Cr3+, Cd2+, Cr6+ and the like, from residues and waste water. The preparation method disclosed by the invention is low in cost and wide in sources, the adsorbent is easy to prepare, and the maneuverability is high. The adsorbent is high in adsorption capacity for metal ions, is high in adsorption rate, can also achieve the purpose of "treating waste with another waste", and also has double effects of purifying environment.
Owner:信阳学院
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