66 results about "Sulphite salt" patented technology

A multi-nutrient liquid fertilizer with high and durably fertility is proportionally prepared from ammonium humate, potassium humate, phosphorus humate, N-P-K humate, trace elements, sulfite as activator (or alkali or alkali-metal carbonate) and chitin solution. Its preparing process is also disclosed.

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 discloses a method and a device for oxidizing sulphite grout in a wet flue gas desulfurization process. The method comprises the following steps: (1) collecting the sulphite grout generated due to the absorption of alkali liquid at an upper section of a desulfurization tower into a grout tank at a lower section of the same desulfurization tower; (2) introducing oxygen-containing gas into a creeping discharge reactor outside the desulfurization tower, and converting the oxygen-containing gas into active gas containing oxygen active substances; (3) injecting the active gas as an oxidizing agent into the sulphite grout, and oxidizing the sulphite grout to form sulfate grout. According to the device, the creeping discharge reactor is arranged outside the grout tank, so that the oxidation rate is increased, the use amount of the oxygen-containing gas is reduced, meanwhile, phenomena of electrode corrosion and grout backflow are avoided, a wet desulfurization absorption process and an oxidation process are integrated and are finished in the same desulfurization tower, an additional oxidation reactor is omitted, the process is simplified, and the cost is lowered.

The invention belongs to the technical field of photoelectrochemical cell semiconductor electrodes, and discloses a bismuth vanadate electrode rich in surface layer oxygen vacancies, and a preparationmethod and an application thereof. The electrode comprises a conductive substrate layer and a bismuth vanadate layer, and the bismuth vanadate layer is obtained through photoetching modification. Thepreparation method comprises the steps: firstly, growing bismuth vanadate particles on a conductive substrate by a metal organic matter decomposition method, then immersing the bismuth vanadate particles in an alkaline buffer solution containing sulfite, and simultaneously applying illumination with certain wavelength and certain intensity for certain time to finish the preparation of the whole electrode. The electrode can be assembled into a photoelectrochemical cell for hydrogen production by photolysis of water in the photoelectrochemical cell. The oxygen vacancies are introduced into thesurface layer of the bismuth vanadate electrode, so that the charge separation efficiency of a solid-liquid interface is effectively improved, the photoelectric conversion efficiency of the photoelectrochemical cell is improved, the operation is simple, and the oxygen vacancy introduction efficiency is high; and meanwhile, vacuum equipment is not needed, so that the operation cost is extremely low, and large-scale production is facilitated.

The invention provides a preparation method of an aluminium alloy complex. The method comprises the following steps of: surface treatment: dipping the pretreated aluminium alloy base material into at least one water solution of soluble phosphate, carbonate, acetate and sulphite, and carrying out surface treatment; and molding: after the surface treatment, putting the aluminium alloy base material into a mould, then injecting a resin composition into the mould to be combined with the aluminium alloy base material, and molding to obtain the aluminium alloy complex. The invention also relates to the aluminium alloy complex. According to the method, the soluble phosphate, the carbonate and the acetate are used for treating the aluminium alloy base material, and nanoscale micropores can be obtained; the soluble phosphate, the carbonate and the acetate are free from toxicity and volatility, has no harm to the environment, and has good safety performance; and after the surface treatment, the aluminium alloy base material and a resin layer of the aluminium alloy complex have very good bonding force, so that the aluminium alloy complex is high in tensile strength.

The invention is an electrolyte, containing Li salt as electrolyte, organic solvent and additive, where the additive is selected from one or several of Li carbonate, Li sulfate, Li sulfite, Li nitrate, Li nitrite and Li aluminate. Thus, the overcharge safety and low temperature performance of a battery using the electrolyte containing inorganic matter additive are improved and there is no negative effect on the other performances of the battery, even obviously improved. And it not only enhances Li ion battery overcharge safety and improves the low temperature discharging performance, but also increases battery capacity, cycling performance, storage stability and reduces production cost.

The present invention provides a gold-plating solution which can not be substituted by nickel. When the matrix for plating chemical nickel is not powdered with direct current, the matrix can not be substituted in the gold-plating solution to form layer with poor adhesive force, so that it can raise boding force of gold-plated layer on the matrix. Said invention water base gold-plating solution contains potassium dicyanoaurate, EDTA salt, pyrophosphite and thiourea. The use condition of gold-plating solution includes: temp. of plating solution is 55-60 deg.C, pH value is 7.5-10, current intensity is 0.04-0.5 A/sq.dm, and its power supply can be D.C. power supply or pulse square-wave power supply.

The invention relates to a regeneration method of alkaline phenolic resin old sand. The regeneration method comprises the following steps of 1, adding 0.2-2% by mass of powder into alkaline phenolic resin old sand, carrying out mixing to obtain a uniform mixture, heating the mixture to a temperature of 600-800 DEG C, and carrying out hot method regeneration for 30-60min, and 2, screening the regenerative sand subjected to hot method regeneration to remove impurities of the regenerative sand so that the alkaline phenolic resin regenerative sand is obtained. The powder is high-valence carbonate or sulfite. The powder can be easily decomposed at a high temperature and form a corresponding oxide, the oxide is added into the regenerative sand and improves mold core strength and obviously improves regeneration effects, and the treated regenerative sand has obviously reduced acid demand value, pH value and loss on ignition, can replace original sand and can satisfy heating core and cooling core conditions. The regeneration method improves regenerative sand quality, reduces environmental pollution caused by old sand and has an important meaning for saving a casting enterprise molding material cost.

The invention provides a method for removing hexavalent chromium in the process of preparing cobalt nickel hydroxide from laterite-nickel ore. The method comprises the steps that before the high-pressure acid leaching step, laterite-nickel ore pulp is preheated, before the preheating step, a first reducing agent is added into the laterite-nickel ore pulp, and then the laterite-nickel ore pulp added with the first reducing agent is made to enter the high-pressure acid leaching step; wherein the first reducing agent is one or more of pyrite, sulfur and chromite, or organic wastewater; or, a second reducing agent is added into the leachate obtained in the cyclic leaching step, and then the residual ore neutralization step is executed; and the second reducing agent is one or more of sulfite, pyrosulfite, ferrite, thiosulfate, sulfide salt and bisulfite of alkali metal or alkaline-earth metal. By utilizing the method provided by the invention, hexavalent chromium can be removed from the source on the basis of not changing the high-pressure leaching procedure of the laterite-nickel ore, so that the nickel-cobalt hydroxide product is prevented from being carried out, and the original steps are not influenced.

An improved method for recovering a purified polyether polyol comprising the steps of providing an aqueous solution of a polyether polyol containing an alkali metal catalyst residual formed from a transesterification process, contacting the aqueous solution with a stoichiometric excess of magnesium sulfate to form a second aqueous solution, removing water from said second aqueous solution at a temperature above the melt temperature of said polyether polyol to produce a dehydrated slurry containing a molten polyether polyol phase essentially free of residual alkali metal and a precipitated solid phase comprising sulfate and/or sulfite salts of the alkali metal catalyst, magnesium hydroxide, and excess magnesium sulfate and/or sulfide, passing the dehydrated slurry of through a filtration system comprising a filtration press to separate the molten polyether polyol phase from the precipitated solid phase, wherein the filtration press is treated with a filter aid that is essentially free of transition metal oxide content, separating the molten polyether polyol phase substantially free of water, residual alkali metal catalyst and transition metal contaminants from the precipitated solid phase and recovering polyether polyol from the separated polyether polyol phase.

The invention relates to the technical field of solar cells, and specifically discloses an electrochemical treatment method for surface etching of an absorption layer of a copper zinc tin sulfide thin film solar cell. The method includes the steps of: placing a copper zinc tin sulfide thin film in an electrochemical workstation after selenylation or sulfuration, only connecting a Mo layer with a working electrode, soaking in absolute ethyl alcohol to remove particle impurities; preparing a treatment solution which is a mixed solution of sulfite, metal sulfide and deionized water and whose pH value is 8 to 14; applying an electrical signal, taking the copper zinc tin sulfide thin film out after 1 to 600 seconds, using deionized water to wash the thin film, and drying the thin film with high-purity nitrogen, the electrical signal being any one of a cyclic voltammetry electrical signal, a constant voltage electrical signal, a constant current electrical signal, a pulse voltage electrical signal or a pulse current electrical signal. The method provided by the invention can effectively dissolve a harmful secondary phase protruding from the surface of the thin film, etches defects of the surface of the thin film, reduces the recombination rate of photon-generated carrier pairs at an interface, is environment-friendly, and facilitates industrial popularization.

The invention discloses a desulfurization ash-based cementing material, and a preparation method and application thereof. The desulfurization ash-based cementing material is mainly prepared by doping a certain amount of an H4000 surfactant into industrial waste residues such as desulfurization ash, S95-grade mineral powder, boiler ash, fly ash and the like at normal temperature and normal pressure. The preparation method solves the limitation of the existence of unstable sulfite in the desulfurized fly ash components on the materialization application of the desulfurized fly ash components, and has the advantages of simple process, wide raw material source, no addition of strong acid, strong alkali and other easily-corrosive reagents, low energy consumption and small secondary pollution. In addition, the desulfurized ash-based cementing material has the characteristics of high early strength, large softening coefficient, continuously increased later strength and the like, can be applied as a wall material and a road roadbed material, and has a wide prospect.

A process of purifying alcohol produced in a process that includes the Oxo process is disclosed. Aldehyde from the Oxo process that remains with the alcohol is removed by a reaction with an alkali sulphite to produce an insoluble adduct and alcohol having a reduced amount of aldehyde mixed with it. The adduct is removed from the alcohol by filtration.

The invention discloses a method for measuring dithionite by potassium ferricyanide differential spectrophotometry, which aims at the problems that in the prior art, when the content of dithionite ismeasured by use of a potassium ferricyanide differential titration method, the detection limit is high, and the detection requirement of low-concentration dithionite cannot be met. The method comprises the following steps: (1) adding an alkaline substance to enable a reaction to occur under an alkaline condition; (2) sequentially adding a potassium ferricyanide solution and a dithionite sample tobe measured into the alkaline substance, oscillating and shaking to enable the substances to react fully; and (3) detecting a difference value between absorbance values before and after the sample tobe measured is added through spectrophotometry, substituting the difference value into a standard curve equation, and calculating to obtain the content of the dithionite in the sample to be measured.According to the method of the invention, the content of the sample to be measured is reflected through the absorbance change of the potassium ferricyanide after being reduced and consumed by the dithionite under alkaline conditions, thus the method has accurate measurement result, wide detection range and small instrument limiting factor, and is convenient for conventional laboratories to use.

The invention discloses a solution for direct chemical copper plating of an aluminum substrate and an application method thereof. The solution comprises the following components of, in percentage by mass, 5-15 g/L of copper salt, 20-60 g/L of sulfite, 10-50 g/L of complexing agent, 10-30 g/L of reducing agent, 10-50 g/L of buffering agent, 0.05-0.5 g/L of corrosion inhibitor, 0.05-0.1 g/L of surfactant and the balance water, and the copper plating solution is formed by uniformly mixing the components according to the proportion and adjusting the pH value to 7.0-8.0 by using a buffer agent. Thesolution for direct chemical copper plating of the aluminum substrate solves the problem that traditional copper plating corrodes aluminum and the problem that a plating solution attacks photoresist,in the field of wafer-level packaging, vacuum copper plating can be completely replaced, the cost is reduced, and the productivity is improved.

The invention discloses a cyanide-free sulfite system electrogilding solution and application thereof. The cyanide-free sulfite system electrogilding solution comprises the following raw materials: 10 g/L-30 g/L of gold sulfite (in terms of gold element), 50 g/L-250 g/L of alkali metal sulfite, 130 g/L-280 g/L of an auxiliary complexing agent, 50 g/-120 g/L of conductive salt and 0.08 g/L-1 g/L of a composite additive. The composite additive comprises an organic additive and an inorganic additive, the organic additive at least contains an alcohol additive, and the inorganic additive at least contains any one of antimony, cerium, copper, tellurium and bismuth ions. The cyanide-free sulfite system electrogilding solution researched and developed is high in gold content, simple in component, stable in property, wide in pH value range, good in deep plating capacity, relatively high in cathode current density and high in current efficiency, and can be applied to preparation of a thick gold layer.

The invention relates to the technical field of solar cells, and specifically discloses an electrochemical treatment method for improving surface properties of a copper indium gallium selenide thin film. The method includes the steps of: after selenylation, placing the copper indium gallium selenide thin film in an electrochemical workstation, only connecting a Mo layer with a working electrode, and soaking in absolute ethyl alcohol to remove particle impurities; preparing a treatment solution which is a mixed solution of sulfite, metal sulfide and deionized water with a pH value of 8 to 14; and applying an electrical signal which is any one of a cyclic voltammetry electrical signal, constant voltage electrical signal, constant current electrical signal, pulse voltage electrical signal or pulse current electrical current, taking out the copper indium gallium selenide thin film after 1 to 600 seconds, using the deionized water to wash, and drying with high-purity nitrogen. The method provided by the invention can effectively dissolve protrusions on the surface of the thin film, improves the roughness of the surface of the thin film, removes a secondary phase of the surface, optimizes the surface quality of the thin film, is environment-friendly, and facilitates industrial promotion.

The present disclosure relates to methods of synthesis of mesotrione. The process comprises reacting p-toluenesulfinyl chloride with an alkali metal sulfite and an alkali metal bicarbonate to obtain an alkali metal p-toluenesulfinate. Reaction of p-toluene alkali metal sulfinate with monochloroacetic acid alkali metal salt gives p-methylsulfonyltoluene. Furthermore, p-methylsulfonyltoluene is nitrated to obtain 2‑nitrop-methylsulfonyltoluene. Oxidation and halogenation of 2-nitro-p-methylsulfonyltoluene to give 2-nitro-p-methylsulfonylbenzoyl halide. Reaction of 2-nitro-p-methylsulfonylbenzoyl halide with alkali metal salt of 1,3-cyclohexanedione to obtain 3-(2-nitro-p-methylsulfonylbenzoyloxy)cyclohexane- 1-ketone. Reaction of 3-(2-nitro-p-methylsulfonylbenzoyloxy)cyclohexane-1-one with a base, a third fluid medium and a source of cyanide ions to obtain amorphous mesotrione. The present disclosure also discloses a step of converting amorphous mesotrione to crystalline mesotrione having a purity greater than 99%. The preparation method of mesotrione of the present disclosure is rapid, economical and environmentally friendly.