69 results about "Sulphite salt" patented technology

The invention provides an amorphous alloy metallic phase corrosive agent which comprises nitric acid, hydrochloric acid, lopsided sulphite and water. The metallic phase corrosive agent cannot form a pollution layer on the surface of an amorphous alloy sample and overmuch corrode a crystalline phase in amorphous alloy and is beneficial to observing the crystalline phase of the amorphous alloy so as to evaluate the quality of the amorphous alloy.

The invention provides a carbon dioxide solid absorbent capable of effectively inhibiting active components from losing effect. One or more of potassium carbonate, sodium carbonate and alkali metal base carbonates is / are used as the active component, one or more of calcium oxide, magnesium oxide and alkali-earth oxides is / are used as the additive, and active aluminum oxide is used as an absorbent carrier; and a precipitation method, impregnation method, impregnation-precipitation method or impregnation-spray method is used for preparing the carbon dioxide solid absorbent. The absorbent can efficiently and quickly remove carbon dioxide in fume, and can also effectively lower loss of effect of the active component alkali metal base carbonates due to sulfur dioxide and other foreign gases in the fume. The research indicates that the carbon dioxide absorption temperature of the absorbent is 60-80 DEG C, the regeneration temperature is 100-300 DEG C, and calcium oxide, magnesium oxide and other additives react with SO2 in the fume to generate sulfites, thereby effectively lowering the loss of effect of the active components due to SO2 and prolonging the service life of the solid absorbent.

This invention describes a process for producing a nanoscale zero-valent metal, including reduction of a metal ion solution with a dithionite compound, wherein the reduction is carried out under alkaline conditions under substantially an inert atmosphere. A nanoscale zero-valent metal obtainable by this process, and having a new crystalline form, is also described. The nanoscale zero-valent metal produced by the process of the invention is preferably iron, and is advantageously used for the remediation of contaminated water.

The present invention is directed to a coated bismuth oxy halide-based pigment having a coating comprising an antioxidant, said antioxidant is being a phenol based, a phosphite or phosphonate based, or a thioether based stabilizer, and the coating comprising an inner coating and an outer coating, wherein the outer coating comprises the antioxidant, and wherein the inner coating comprises a first layer consisting of one or more salts, or one or more oxides, heteropolyacids, organic acids, sulphites, sulfides, sulfates, phosphates, pyrophosphates, polyphosphates, hydrates, carbonates, or a combination thereof, selected from the group of alkali-earth metals, metals, non-metals, transition metals or lanthanides. Further, the present invention is directed to a composition comprising a paint, alacquer, an ink, a cosmetic, a resin, a plastisol or a polymer formulation, and such pigment. In addition, the present invention is directed to a method for manufacturing a coated bismuth oxy halide-based pigment, said method comprising the steps of: - providing a dispersion of a bismuth oxy halide-based pigment, adding a dispersion of an antioxidant, mixing and drying.

This water-based coolant is characterized by being obtained by mixing at least one of each of the following inorganic acid salts: phosphate, phosphite, sulphate, sulphite, borate, molybdate, tungstate, carbonate, hydrogen carbonate, and sesquicarbonate. This water-based coolant exhibits excellent cooling performance, and excellent anti-corrosion properties towards metal materials to be cooled therewith, and thus is suitable for use as a cutting fluid and a quenching fluid for metal materials.

The present invention provides a system for capturing CO2 and / or SO2, comprising: (a) a CO2 and / or SO2 absorber comprising an amine and / or amino acid salt capable of absorbing the CO2 and / or SO2 to produce a CO2- and / or SO2-containing solution; (b) an amine regenerator to regenerate the amine and / or amino acid salt; and, when the system captures CO2, (c) an alkali metal carbonate regenerator comprising an ammonium catalyst capable catalyzing the aqueous alkali metal bicarbonate into the alkali metal carbonate and CO2 gas. The present invention also provides for a system for capturing SO2, comprising: (a) a SO2 absorber comprising aqueous alkali metal carbonate, wherein the alkali metal carbonate is capable of absorbing the SO2 to produce an alkali metal sulfite / sulfate precipitate and CO2.

The invention relates to a novel photocatalyst NiGa2O4 / AQ / MoO3 as well as a preparation method and application thereof, and belongs to the technical field of a photocatalyst. A hydrothermal method isused for preparing NiGa2O4 / AQ / MoO3; nanometer NiGa2O4 / AQ and nanometer MoO3 are added into absolute ethyl alcohol; after ultrasonic dispersion, obtained suspension liquid is heated and boiled to the boiling state, and is then subjected to constant temperature treatment for 30 min; after the filtering, obtained filtered materials are dried for 8.0 h to obtain powder; the powder is ground to obtainNiGa2O4 / AQ / MoO3. The prepared NiGa2O4 / AQ / MoO3 composite material shows efficient and stable photocatalysis activity in the nitrite and sulphite conversion process; wide application prospects are realized in nitrite and sulphite waste water treatment.

The invention relates to a method for preparing nano-filament cellulose with a high length-diameter ratio by using camellia oleifera shells, belonging to the technical field of nano structure materials. The method comprises the steps of pretreating the camellia oleifera shells serving as an initial raw material by using a sulfite alkaline method, carrying out alkali purification, bleaching by using hydrogen peroxide to obtain camellia oleifera shell cellulose; after that, using a TEMPO / NaClO / NaBr medium oxidation system to treat a great deal of carboxyl groups introduced to fibers of the camellia oleifera shell cellulose, and then further carrying out high-pressure homogenization treatment so as to finally obtain the nano-filament cellulose with the high length-diameter ratio. The method is simple in production technology and easy to implement, and not only well improves the comprehensive utilization value of the camellia oleifera shells and meets the requirements of the sustainable development strategy of China, but also can be used for preparing the nano-filament cellulose which has the high length-diameter ratio and the characteristics of being good in mechanical properties, biodegradable, easy to compound, and the like, thus being widely applied to the industrial fields such as optics, electrics and semiconductor devices.

The invention discloses a method for utilizing camellia oleifera abel fruit shells to prepare cellulose nano-crystal whiskers, and belongs to the technical field of energy chemical materials. According to the method, the camellia oleifera abel fruit shells serve as initial raw materials, and firstly, the fruit shells are subjected to sulphite alkali pretreatment, alkali purification and hydrogen peroxide bleaching to obtain camellia oleifera abel fruit shell cellulose; secondly, the camellia oleifera abel fruit shell cellulose is subjected to acidolysis with organic acid namely oxalic acid, and the camellia oleifera abel fruit shells cellulose can be prepared after centrifugation and ultrasonic dispersion. According to the method, the production process is simple and easy to implement, and not only can the comprehensive utilization value of the camellia oleifera abel fruit shells be well improved, but also the prepared cellulose nano-crystal whiskers have the advantage of being good in mechanical performance, biodegradable, easy to compound and the like and can be widely applied to packaging toughening materials, optoelectronics and semiconductor devices and other industrial fields.

The invention relates to the field of gold plating, and discloses a cyanide-free sulfite gold plating solution and an application thereof. The cyanide-free sulfite gold plating solution contains gold sulfite, alkali metal sulfite, and 3-nitrobenzenesulfonic acid Salts, organic polyamines, organic phosphonates, polyol compounds, high molecular polymers containing imines, and thiourea compounds. The cyanide-free sulfite gold plating solution provided by the present invention contains a current efficiency stabilizer with excellent properties, which participates in the reduction process of the cathode during the gold plating process, and prevents the occurrence of chemical side reactions, thereby improving the current efficiency, which is obviously beneficial Improve the throwing ability of the plating solution. And it improves a series of problems such as the inaccurate prediction of the amount of gold plating caused by the low current and unstable current efficiency, the relatively poor dispersion ability of the plating solution and the low current density.

The invention relates to a carbon steel corrosion inhibitor used in oxygen-containing brine and a preparation method thereof. The corrosion inhibitor includes 1-10 wt% of shrimp shell powder, 10-30 wt% of alkali metal sulfite, 5-25wt% of alkali metal silicate, 5-15 wt% of higher fatty acid glyceride and the balance water. The prepared corrosion inhibitor is added into the oxygen-containing brine according to a certain proportion, after verification, the corrosion rate of carbon steel is lower than 0.1 mm / a, the carbon steel corrosion inhibitor can serve as the corrosion inhibitor for the carbon steel in the oxygen-containing brine, and the characteristics that cost is low, the effect is good, and environment protecting is achieved are achieved.