354 results about "Permanganate" patented technology

An improvement of the methanol carbonylation process for manufacturing acetic acid is disclosed. Specifically disclosed is a method for reducing the formation of alkyl iodides and C3-8 carboxylic acids by removing permanganate reducing compounds (“PRC's”) from the light phase of the condensed light ends overhead stream, including (a) distilling the light phase to yield a PRC enriched overhead stream; and (b) extracting the third overhead stream with water in at least two consecutive stages and separating therefrom one or more aqueous streams containing PRC's.

The invention belongs to the technical field of river water body pollution control and in particular relates to a multiple-element compound flocculating settling agent and the application of the multiple-element compounded flocculating settling agent in arsenic pollution water body treatment. The multiple-element compounded flocculating settling agent is prepared by compounding malysite, aluminium salt, hypermanganate, polyacrylamide and aqueous solution. The multiple-element compounded flocculating settling agent can be applied in the arsenic pollution water body treatment to remove arsenic in the arsenic pollutant water body. The concentration of the arsenic in the treated water can meet or is superior to the specified requirement of three types of water on the arsenic concentration in the national earth surface water environment quality standard (less than 0.05 mg / L). The invention also can be used for removing heavy metals such as copper, chromium, cadmium, lead and the like in water by sedimentation. The multiple-element compounded flocculating settling agent can be used together with a multiple-element compounded metal oxide arsenic removal setting agent in static or flowing arsenic pollution water body treatment for removing the arsenic in the water body polluted by arsenic.

A method for producing furan-2,5-dicarboxylic acid (FDCA) is provided which can efficiently and quantitatively producing FDCA under mild conditions, without employing an expensive catalyst and with a reduced energy consumption. A furan ring compound having two functional groups selected from a hydroxymethyl group, a formyl group and a carboxyl group in the 2- and 5-positions of the furan ring, is oxidized with a metal permanganate in an alkaline environment to produce furan-2,5-dicarboxylic acid. Advantageously, the alkaline environment contains at least one of alkali metal hydroxides and alkali earth metal hydroxides, and the oxidation is performed at a temperature of from 1 to 50° C. by adding the permanganate metal salt to the alkaline aqueous solution containing the furan ring compound.

The invention discloses a transforming solution for preparing anti-corrosion compound oxidation film on an aluminum alloy surface and a using method for the oxidation film. The invention is characterized in that, the transforming solution is a film-forming promoter containing rare-earth salt (nitrate or sulfate and compound salt of cerium, praseodymium, and neodymium), such compound oxidant as radical of permanganate, nitrate and perchlorate, etc., film-forming promoter of vanadium salt and strontium salt, etc.; the transforming solution contains no sexavalent chromium, is environmental friendly; the reaction speed is improved by the compound oxidant and the film-forming promoter, no heating is needed for the chemical transforming, the treating time is 1-5 min. The invention can rapidly prepare under room temperature compound oxidation film comprising compound rare-earth oxide, alumina and manganese oxide with good resistance to corrosion on aluminum alloy surface. The treating solution from the invention is of rapid film-forming speed, simple process, even film layer, high resistance to corrosion, and low environmental pollution, etc.

The invention discloses a graphene / manganese tetraoxide nanocomposite and a preparation method thereof. The method comprises the following steps of firstly, diluting graphite oxide concentrated solution to be 0.1-5mg / mL with deionized water, stirring uniformly, after water bath ultrasonic at room temperature, putting a beaker into ice-water bath, and carrying out ultrasonic treatment by a probe ultrasonic processor to obtain graphene oxide solution; secondly, adding permanganate into the graphene oxide solution, stirring till the permanganate is dissolved completely, adding a reducing agent, and stirring uniformly; thirdly, reacting the solution obtained in step two at 80-120 DEG C, after reacting, cooling, centrifuging and washing, and vacuum-drying, so as to obtain the graphene / manganese tetraoxide nanocomposite. The graphene / manganese tetraoxide nanocomposite is prepared by one-step hydrothermal method, the reducing agent simultaneously reduces the two raw materials, and the method is simple and easy to operate.

The present invention discloses a bleached chemical pulp prepared by using graminoid plant as raw material and its preparation method. Said invention is characterized by that it utilizes a high-hardness pulp which is obtained by using cooking process and whose permanganate number is 16-28 and equal to Kappa number 26-50 and makes said high-hardness pulp undergo the processes of pulp-washing and bleaching treatment so as to obtain the invented bleached chemical pulp whose breaking length is 4500-8000 m and folding endurance is 20-70 times.

An improvement of the methanol carbonylation process for manufacturing acetic acid is disclosed. Specifically disclosed is a method for reducing the formation of alkyl iodides and C3-8 carboxylic acids by removing permanganate reducing compounds (“PRC's”) from the light phase of the condensed light ends overhead stream, including (a) distilling the light phase to yield a PRC enriched overhead stream; and (b) extracting the third overhead stream with water in at least two consecutive stages and separating therefrom one or more aqueous streams containing PRC's.

The invention discloses a preparation and application method for conversion liquid of a corrosion resistant oxide film on magnesium alloy surface, which is characterized in that: the conversion liquid adopts rare-earth-containing salt, permanganate, persulphate, nitrate and perchlorate as composite oxidant, zirconium salt, vanadic salt and strontium salt as film forming promoter, boric acid, aminoacetic acid-hydrochloric acid solution as pH buffer regulator, pyridine, thiourea and derivatives, tannins, phytic acid and the salt compound as corrosion inhibitor, sodium dodecyl benzene sulfonate and dodecyl phenol polyoxyethlene ether (OP-10) as wetting agent; the conversion liquid is free from hexavalent chromium and environment-friendly; heating is not required for chemical conversion treatment, and the treatment time is 1 to 5min; composite oxide film with good corrosion resistance performance comprising rare-earth composite oxide, magnesia and manganese oxide can be rapidly prepared at on magnesium alloy surface at ambient temperature. The preparation method for conversion liquid of a corrosion resistant oxide film on magnesium alloy surface has the advantages of fast film forming, simple process, uniform film, strong corrosion resistance and less environmental pollution.

The invention relates to doped spherical LiMn2O4 (manganese acid lithium) and a preparation method thereof, belonging to the technical field of new energy materials. The preparation method comprises the following steps: reaction is carried out on water-soluble manganese salt and permanganate or persulfate under the liquid-phase condition, and spherical MnO2 (manganese dioxide) is first generated by controlling the pH value, temperature and the feeding speed of reaction liquid; the spherical MnO2 is uniformly mixed with LiOH (lithium hydroxide) or LiNO3 (lithium nitrate) or Li2CO3 (lithium carbonate) and a doping agent (zinc, aluminum or chromium) so as to obtain a mixture; the mixture is calcined under the temperature of 500 to 850 DEG C and is naturally cooled along with a furnace; and then the doped spherical LiMn2O4 is obtained through ball milling. The preparation process has the characteristics of simple preparation method, low energy consumption, easy material obtaining and high efficiency; an obtained product has excellent physical, chemical and electrochemical performances. Therefore, the doped spherical LiMn2O4 is the excellent anode material for the lithium ion battery.

The invention discloses a method for preparing a polyaniline / manganese dioxide composite material for a super capacitor, which adopts permanganate as an oxidizer to oxidize aniline to directly obtain the polyaniline / manganese dioxide composite material. The method can ensure the contact of manganese dioxide and polyaniline at molecular level by oxidizing the aniline by the permanganate, has no an impurity phase after a reaction at the same time, and simplifies subsequent treatment work. The method for preparing the polyaniline / manganese dioxide composite material for the super capacitor has the advantages of simple process, convenient operation and convenient control, ensures that the electric conductivity of the prepared polyaniline / manganese dioxide composite material is effectively improved, and is suitable for mass industrial production.

The invention relates to a preparation method for manganese oxide nano rods, belonging to the field of nano function materials. According to the preparation method, rod-shaped alkaline manganese oxide can be prepared by using hypermanganate and ethylene glycol under a hydrothermal condition, wherein the longest length of the alkaline manganese oxide can be up to six microns and the diameter size is 10nm-130nm; alkaline manganese oxide precursors are calcined under different calcining conditions to obtain the manganese oxide nano rods with different valence states and different sizes, namely manganese dioxide nano rods, manganese sesquioxide nano rods and trimanganese tetraoxide nano rods. By adopting the preparation method, the problems of an existing solvothermal method that the reaction time is long and the reaction temperature is high when the alkaline manganese oxide nano rods are synthesized and the diameters of the products are great and the products are not uniformly distributed are solved; and the preparation method has the advantages of simplicity in operation and many product varieties.

The invention discloses a preparation method of core-shell type composite materials of a manganese dioxide coated carbon nm tube. The method comprises the steps as follows: the carbon nanometer tube is put in mixed acid containing thick sulphuric acid and thick nitric acid for supersonic treatment, thereby enabling the surface of the carbon tube to contact with hydrophilic group; the carbon nanometer tube with surfactant is mixed to form suspending liquid; permanganate salts is added to react with the surfactant so as to produce the manganese dioxide which nucleates on the surface of the carbon tube; the manganese dioxide grows and forms even coating. The invention with simple technique and low production cost realizes the coating on the surface of the carbon nm tube and reduces the damages to the structure of the carbon tube. The nanometer crystals of the manganese dioxide array along the tube diameter of the carbon tube to enlarge the surface area of the coating. The composite powder has good dispersivity and high porosity. And the composite powder exhibits wide applicable prospect in the industrial fields of the chemical catalyst, the high performance battery and the super capacitor.

Disclosed is a method of controlling a separation process for removing permanganate reducing compounds from a process stream in the methanol carbonylation process for making acetic acid, where the method includes the steps of measuring the density of a stream containing acetaldehyde and methyl iodide, optionally calculating the relative concentrations of acetaldehyde and methyl iodide in the stream, and adjusting distillation or extraction process parameters based on the measured density or one or more relative concentrations calculated therefrom.

A visualized harmful gas removing agent is prepared from the porous carrier chosen from silica gel, molecular sieve, zeolite, alumina and calcium chloride in the form of powder, particle, or filtering paper, through treating it by potassium permanganate in alkalinecondition. It can capture, adsorb and eliminate volatile and reductive harmful gases. Its result can be shown by the color variation from red to brown.

A process for the preparation of graphite oxide from graphite using a permanganate salt and an aqueous sulfuric acid solution. The graphite oxide may be further reacted to form graphene sheets.

A magnesium alloy surface treatment method belongs to the technical field of magnesium alloy surface treatment. The process flow includes degreasing, chemical oxidation, post-treatment and water washing between each process; the chemical oxidation solution used in the chemical oxidation process contains permanganate, and its concentration converted into KMnO4 is 1-60g / L, containing The concentration of the rare earth salt converted into Ce(NO3) 3 6H2O is 0.01-50g / L, and the concentration of the film-forming aid contained in the conversion into Zr(SO4) 2 is 0.005-30g / L; the temperature of the chemical oxidation solution It is 273 ~ 363K, and the chemical oxidation treatment time is 0.3 ~ 30min. The chemical oxidation solution can form a conversion film on the surface of the magnesium alloy at normal temperature, the film layer is dense, the corrosion resistance is good, and the bonding force with the paint film is good. It is suitable for short-term anticorrosion during pre-painting treatment and transportation and storage.

The invention provides a process method for preparing graphite oxide. The process method comprises the following steps: a. mixing graphite, a nitric acid compound, permanganate and concentrated sulfuric acid; b. heating to 50 to 90 DEG C, and reacting for 10 minutes and 10 hours; c. pouring the solution obtained in the step b into a vessel B containing water or an ice water mixture under 0 to 60 DEG C; d. adding hydrogen peroxide to the product obtained in the step c to obtain a graphite oxide dispersion liquid; and e. filtering, washing and drying the dispersion liquid obtained in the step d to obtain graphite oxide powder. By adopting the method, the risk in the preparation of graphite can be reduced; the requirements on production equipment can be reduced; and the stripping effect of graphite oxide can be remained. The graphite oxide prepared by the method can be used for preparing graphene as well as be applicable to the cell materials, composite materials, electronic devices, energy storage material and other fields.

The invention discloses a method for preparing a manganese dioxide nanosheet coated carbon / sulphur (MnO2@C / S) compound. The method comprises the following steps: firstly heating and melting a carbon material and sulphur simple substance to obtain a carbon / sulphur compound, then adding permanganate solution into aqueous phase dispersion liquid of the carbon / sulphur compound, heating, stirring, reacting, then carrying out solid-liquid separation, washing, and drying, so that the manganese dioxide nanosheet coated carbon / sulphur compound is obtained. Besides, the invention also discloses the manganese dioxide nanosheet coated carbon / sulphur compound obtained by adopting the method and application thereof. When the manganese dioxide nanosheet coated carbon / sulphur compound is applied to a lithium sulphur battery cathode material, and initial discharge capacity, cycle performance and rate capability of the obtained battery are respectively greatly improved.

Disclosed is a method for preparing an MnO2 / carbon composite for a lithium-air secondary battery by preparing a precursor solution by dissolving permanganate powder in distilled water, preparing a MnO2 / carbon composite by dispersing carbon in the precursor solution and using a reducing agent, and mixing the MnO2 / carbon composite with polyvinylidene fluoride (PVdF) and supporting the mixture on nickel foam. According to the method for preparing a MnO2 / carbon composite for a lithium-air secondary battery, the MnO2 / carbon composite is prepared by dispersing carbon in a permanganate solution, instead of simply mixing carbon with manganese oxide, and thus the binding force between carbon and manganese oxide and the dispersion of carbon in manganese oxide can increase. The MnO2 / carbon composite prepared by the above method has improved catalytic performance as an air electrode for a lithium-air secondary battery and thus can be effectively used as an electrode material for lithium-air secondary batteries.

The invention relates to a method for synthesizing monolayer manganese dioxide nanosheet by one step, belonging to the technical field of controllable synthesis and appearance control of transition metal oxide nano materials. According to the method, hypermanganate is subjected to in-situ reduction through one step reaction of hypermanganate in acid alkyl sulfate surfactant water solution and utilizing corresponding alcohol generated by hydrolyzing the alkyl sulfate surfactant to produce manganese dioxide. Compared with the method in which the reducing agent alcohol is directly added, according to the method, the generation speed of manganese dioxide is effectively controlled through hydrolysis of the surfactant step by step, and the surfactant is also used as a structural induction reagent, so that the monolayer manganese dioxide nanosheet is prepared by one step. The prepared monolayer manganese dioxide nanosheet has excellent electrochemical capacitive performance, and can be widely used in the fields of batteries, sensing, catalysis and the like.

The present invention relates to the preparation process of ferric oxide red powder. Unlike available technology, which has the demerits of high production cost and low product purity of processed ferrous permanganate, the present invention uses ferrous sulfate as the side product of titanium white powder production as material and produces high purity ferric oxide red powder via purification to eliminate impurity, precipitation to eliminate manganese, water washing, spray burning and other steps. The ferric oxide red powder has impurity content of Si, Al, Ca, Mg, etc. less than 80 ppm, Mn content lower than 0.2 wt% and Fe2O3 content over 99.5 wt%, and is used as soft magnetic material. The present invention has simple technological process, low production cost and high product quality, and may be used in industrial production.

The invention discloses a preparation method of an alpha-MnO2 catalyst for catalyzing oxidation of volatile organic compounds, relates to the preparation method of the alpha-MnO2 catalyst, and aims tosolve the problems that an existing manganese oxide catalyst is low in reaction activity and poor in stability and water resistance. The preparation method comprises the following steps: preparing apotassium permanganate solution and an ethylene glycol solution with the pH value of 7.0-12.0, mixing, reacting under water bath and stirring conditions, adding ethylene glycol, reacting under water bath and stirring conditions to obtain a turbid liquid, and sequentially filtering, washing, drying and calcining. According to the method, the alpha-MnO2 catalyst is obtained by taking the ethylene glycol as a reducing agent and potassium permanganate as a manganese source for the first time under the condition of room temperature or relatively low temperature, and compared with a traditional high-temperature hydrothermal method and a reflux method, the catalyst disclosed by the invention has the advantages of high activity, high stability and water resistance. The method is suitable for preparing the alpha-MnO2 catalyst.

The invention discloses a preparation method for a zinc anode. The preparation method comprises: pretreating a metal zinc, and preparing the anode from the pretreated metal zinc, wherein pretreatment comprises contacting the metal zinc with a processing liquid for modifying the metal zinc surface, and the processing liquid is one of a hydrogen peroxide solution, a permanganate solution, a trivalent ferric ion solution and a tetravalent cerium ion solution. The invention also provides the zinc anode obtained by employing the above preparation method and a battery containing the above zinc anode. By using the processing liquid for pretreating the metal zinc, the side reaction of the zinc anode is reduced, generation of a zinc anode gas is effectively inhibited, and thus cell inflation is avoided, the safety performance of the cell is improved, and cell performance attenuation is effectively inhibited.

In one embodiment, the invention is to a process for purifying acetic anhydride. The process includes the steps of feeding a liquid crude acetic anhydride stream directly to a distillation column and separating the liquid crude acetic anhydride stream to produce a light ends stream, a sidedraw and a residue stream. The sidedraw comprises substantially pure acetic anhydride product. The distillation column is operated at a pressure less than 101 kPa. The substantially pure acetic anhydride product comprises greater than 98 wt. % acetic anhydride, has a permanganate time of greater than 10 minutes, and has an APHA color of less than 10.

The invention discloses a method for quickly detecting hypermanganate index in water by molecular absorption spectrometry. The method comprises the following steps: selecting a color comparison tube to extract a water sample, adding proper sulfuric acid to ensure the water sample is of acidity; adding 0.01 to 0.2umol / L of hypermanganate solution, and heating for 30 minutes in a heat reactor at 100 DEG C; cooling, reducing the residual hypermanganate with nitrite, and adding excessive nitrite to react 3 to 5 minutes; putting 1ml of the reaction solution after constant volume in a 25ml color comparison tube; adding citric acid-ethanol solution, and converting the nitrite into nitrogen dioxide instantly; and carrying gas-phase molecules to an absorption tube by carrier gas, and detecting the light absorption value at the position of 213.9 nano-wavelength. The invention establishes a quick quantitative analysis method for the hypermanganate index in the water by an indirect nitrite detection mode, has the characteristics of quick detection, high accuracy, less turbidity influence, little reagent and safety and environmental protection, and can be widely applied to emergency, online detection, flowing injection, lab information management and the like.

A method for removing permanganate-reducing impurities from an acetic acid product is disclosed. The method comprises contacting an acetic acid product containing permanganate-reducing impurities with peracetic acid and an oxygen-containing gas. The method is particularly suitable for post treatment of acetic acid that contains permanganate-reducing impurities such as crotonaldehyde.

The invention provides a lanthanum-modified manganese oxide catalyst, and a preparation method and an application thereof. The preparation method of the lanthanum-modified manganese oxide catalyst includes the following steps: performing hydro-thermal treatment on a bivalent manganese salt and permanganate or persulfate to prepare manganese oxide, doping the manganese oxide with a lanthanum salt,and obtaining the lanthanum-modified manganese oxide catalyst by drying and high temperature burning treatment. The prepared lanthanum-modified manganese oxide catalyst can efficiently catalyze and decompose ozone at room temperature, and enables the time required for decomposing the ozone at room temperature to be greatly shortened compared with manganese oxide without lanthanum modification.