2411 results about "Phosphorous acid" patented technology

The invention provides methods for synthesizing oligonucleotides using nucleoside monomers having carbonate protected hydroxyl groups that are deprotected with α-effect nucleophiles. The α-effect nucleophile irreversibly cleave the carbonate protecting groups while simultaneously oxidizing the internucleotide phosphite triester linkage to a phosphodiester linkage. The procedure may be carried out in aqueous solution at neutral to mildly basic pH. The method eliminates the need for separate deprotection and oxidation steps, and, since the use of acid to remove protecting groups is unnecessary, acid-induced depurination is avoided. Fluorescent or other readily detectable carbonate protecting groups can be used, enabling monitoring of individual reaction steps during oligonucleotide synthesis. The invention is particularly useful in the highly parallel, microscale synthesis of oligonucleotides.

Improved glass compositions for glass fibers typically useful for fire resistant blankets or containers to provide high burn-through resistance at temperatures of 2,300° F. and typically comprising 10.23% to 81.81% silica, 2.0% to 26.00% alumina, 3.0% to 15.0% calcium oxide, 0% to 10.50% magnesium oxide, 1.0% to 18.0% ferrous+ferric oxide, and 0% to 4.0% titanium dioxide; the improved glass compositions may include 0% to 9% lithium oxide, 0% to 9% boron oxide, 0% to 6.0% manganese oxide, and 0% to 4.0% phosphorous oxide.

The invention relates to a method for recycling titanium dioxide in a waste SCR (Selective Catalytic Reduction) denitration catalyst. The method comprises the following steps of: firstly removing dust from the waste denitration catalyst, pulverizing, then adding concentrated sulfuric acid so as to carry out acid hydrolysis on the waste denitration catalyst to obtain a concentrated titanyl sulfate solution, and adding water for dilution; adding a non-ionic emulsifier serving as a flocculating agent and a sulfonate surface active agent or a polycarboxylate surface active agent as a coagulant aid, and adding water-solubility methyl silicone oil; pumping into a plate-and-frame filter press for filter pressing, carrying out vacuum concentration on filtrate, then heating to 90 DEG C to 98 DEG C, and maintaining for 5.5 hours so as to hydrolyze the filtrate; cooling a hydrolysis product to 40 DEG C, and carrying out vacuum filtration so as to sediment out metatitanic acid; rinsing with sand-filtered water and deionized water, and adding potassium carbonate or phosphorous acid to obtain metatitanic acid filter cakes; and drying the filter cakes, calcining at 500-800 DEG C, and then pulverizing to obtain a titanium dioxide finished product. The method has the advantages of being capable of reducing disposal amount of the waste denitration catalyst, recycling the waste denitration catalyst and reducing the production cost of the waste denitration catalyst.

A concentrated fluid phosphorus fertilizer is shown. In the preferred embodiment, the concentrated fluid phosphorus fertilizer is an aqueous suspension fertilizer composition. The composition comprises one or more phosphorus-containing acids or salts thereof selected from the group consisting of phosphoric acid, polyphosphoric acid, phosphorous acid, polyphosphorous acid, hypophosphorous acid and polyhypophosphorous acid, and salts thereof. A suspension agent maintains undissolved solids in substantially homogeneous suspension wherein the suspension has a total acid and salt content of about 50% w/w to about 80% w/w. The concentrated fluid phosphorus fertilizer is a stable suspension and when diluted with water a substantially fully soluble fertilizer having acceptable pH for phosphorus uptake is formed. Methods for improving the phosphorus uptake and improving the growth rate of plants is also shown.

The invention provides a new phosphorous acid concrete super plasticizer with a polyethyleneimine structure as well as a preparation method and an application thereof. The phosphorous acid concrete super plasticizer with a polyethyleneimine structure can effectively improve the concrete fluidity, and the preparation method is simple and effective. The preparation method comprises the following steps: a) making chloro-substituted polyether react with polyethyleneimine so that a part of amino groups H of the polyethyleneimine are substituted to obtain polyethyleneimine with a polyoxyethylene ether branch structure, wherein the molar ratio of the chloro-substituted polyether to the imino groups contained in the polyethyleneimine is 1:(3-8); and b) performing phosphorylation of the remaining amino groups H of the polyethyleneimine with a polyoxyethylene ether branch structure to obtain the phosphorous acid concrete super plasticizer with a polyethyleneimine structure.

The invention discloses a method for extracting and purifying wet-process phosphorous acid to produce industrial-grade phosphorous acid, which comprises the following steps: step 1, decoloration: utilizing active carbon and hydrogen peroxide to decolorize the phosphorous in two steps; step 2, extraction: utilizing extracting agent to extract phosphorous; step 3, washing: utilizing cleaning solution to washing organic phase; step 4, backextraction: utilizing pure water to extract the phosphorous acid in the organic phase; step 5, desulphurization: utilizing desulphurization agent to remove sulfate radical in the phosphorous acid; and step 6, concentration: improving the concentration of phosphorous acid, defluoridating through vacuum concentration to obtain the industrial-grade phosphorous acid. The method has the advantages that: (1) segmented decoloration is adopted, so the pretreatment process is simplified; (2) the used turntable tower is stable, the continuity is strong, and the maintenance expense is low; (3) sulfuric acid is compensated from the middle part of the extraction tower, so the yield of the industrial product is improved, the extraction rate can reach more than 95 percent, and the yield of the industrial product can reach more than 90 percent; (4) a plate-type heat exchanger is adopted, so the land occupation area is small; and (5) and the side-product barium sulfate is washed and dried to be used as an industrial product.

The invention discloses a method for degrading organic pollutant and recycling phosphate in chemical nickel-plating waste liquid, which belongs to the technical field of environment-friendly waste water treatment and resource recycle. The method conducts oxidation degradation of organic pollutant in waste water through the oxidation technology, simultaneously oxidizes hypophosphorous acid radical and phosphorous acid radical in waste water into orthophosphate radical and recycles phosphate and nickel by enabling the orthophosphate radical and nonmetal or metal ions to be precipitated. The method achieves resource recycle while treating waste water and has good environment benefits and economical benefits and wide application prospect.

The invention relates to a preparation method of Li2FeSiO4 cathode material used for controlling Fe3P. The technical scheme comprises the following steps: weighting lithium salt or hydrate of lithium salt, ferrous salt or hydrate of ferrous salt, silicon compound and phosphorous acid or aqueous solution of phosphorous acid according to a molar ratio of the reactants that Li<+>:Fe<2+>:Si:H3PO3=0.95-1.10:0.95-1.10:0.70-0.999:0.001-0.429, mixing the reactants, then adding carbon-containing compound which accounts for 1wt%-20wt% of anhydrous reactants and wet grinding medium which accounts for 0.10-10 times of anhydrous reactants by volume, mixing with a ball mill, heating with water bath, mixing with a ball mill again, heating and drying in vacuum, and then using the two-stage sintering process or temperature programmed two-stage sintering process to prepare Li2FeSiO4 with controllable Fe3P under inert atmosphere or weak reduction atmosphere. The material prepared by the method of the invention has better discharge performance, the discharge capacity is significantly increased in 2.9V zone and the cycle performance is good under 0.3C current.

On the premise of deep hydrodesulfurization, the main problem in diesel fuel's hydrotreatment is to rid the refractory sulfide and hydrogenate polycyclic aromatic hydrocarbon. Loaded nickel phosphide catalyst demonstrates higher hydrodesulfurization activity and better activity stability. However, the traditional nickel phosphide catalyst is prepared by temperature programming of nickel phosphide, so that dispersion degree of active components is low. In the invention, through solid-phase reaction between phosphorous acid ions and nickel ions, bulk phase and loaded nickel phosphide catalyst with higher active component dispersion degree and fine catalytic activity are obtained at low temperature. The invention is applicable to diesel oil hydroprocessing.

A method of treating a metallic surface which comprises treating a metal-coated steel panel with a nonchromate metallic surface treating agent containing, in each liter thereof, (a-1) a silane coupling agent and/or a hydrolytic condensation product thereof, (a-2) water-dispersible silica in a proportion, and (a-3) a zirconium compound and/or a titanium compound, drying the treated steel panel and coating it with an anticorrosion coating agent containing, in each liter of an aqueous resin solution or dispersion, (b-1) a silane coupling agent and/or a hydrolytic condensation product thereof, (b-2) water-dispersible silica and (b-3) at least one phosphorus-containing ion selected from among phosphate ion, phosphite ion and hypophosphite ion.

This invention relates to a method for manufacturing electrode foils of aluminium electrolytic condensers including pure water boiling, formation, depolarization and reformation in which, the formation liquid electrolyte includes one of solutions of mineral acid containing boric acid or phosphoric acid or organic acid with oxalic acid or their saline material characterizing in adding soppm~5000ppm hypophosphorous acid, phosphorous acid, or their saline materials as the active material added by 100ppm~10000ppm citric acid, tartaric acid or their saline material as the complexant suppressing solution of the foil to reduce attenuation of capacitance.

The invention relates to the technical field of high molecular materials and particularly relates to preparation and application methods of a selective laser sintering polypropylene powdery material. The method comprises the following steps: obtaining polypropylene powder by a freeze grinding method; grading and collecting by an airflow screening machine, selecting polypropylene powder with the granularity in a range of 200-800 meshes and returning coarse materials which do not meet the fineness requirement to a stock bin and continuously smashing; and adding 100 parts of polypropylene powder, 0.1-1 part of graphite powder, 0.01-0.5 part of antioxidant and 0.5-6 parts of metallic soap salt and uniformly mixing in a high speed mixer, wherein the granularity of the graphite powder is 1000-5000 meshes and the antioxidant is a compound antioxidant consisting of phenols and phosphonate or thioester in a weight ratio of 1:1. The polypropylene powder prepared by the invention has excellent sintering performance and the SLS (Selective Laser Sintering) formed piece prepared by the polypropylene powder has high mechanical property and dimensional precision.

The invention discloses packing leather cup rubber for hydraulic mount. The packing leather cup rubber is prepared from the following raw materials in parts by weight: 30-40 parts of nitrile rubber, 20-30 parts of isoprene rubber, 20-40 parts of ethylene propylene terpolymer 5962 (LANXESS Deutschland), 10-15 parts of fluorosilicone rubber, 3-5 parts of natural rubber, 20-30 parts of high abrasion furnace black N330, 10-15 parts of modified white carbon black, 3-4 parts of antimony trioxide, 8-10 parts of modified wood ash, 4-6 parts of attapulgite, 4-6 parts of meerschaum, 9-11 parts of modified iron tailing slag powder, 0.5-1 part of stearic acid, 0.5-1 part of vulcanizing agent TMT, 0.2-0.4 part of accelerant DM, 0.3-0.6 part of accelerant BZ, 1-2 parts of calcium stearate, 2-4 parts of zinc oxide, 0.2-0.4 part of ferrocene, 1-2 parts of polyethylene wax, 1-2 parts of triphenyl phosphite, 1-2 parts of anti-aging agent RD, 2-3 parts of vinyl-tris(beta-methoxyethoxy)silane and 16-18 parts of butyl epoxy oleate. The rubber disclosed by the invention has excellent ozone resistance, excellent low temperature resistance and heat resistance and is large in operating temperature range and environment-friendly in process, so that the rubber can be used for preparing various packing materials.

A silicon carbon lithium ion battery electrolyte and a silicon carbon lithium ion battery using the same belong to the field of lithium ion battery materials. The electrolyte comprises a film-formingadditive accounting for 8% to 15% by weight of the total weight of the electrolyte. The film-forming additive comprises a phosphate ester/phosphite ester compound, fluoroethylene carbonate (FEC), ethylene sulfate (DTD) and lithium difluorophosphate (LiPO2F2). The electrolyte has excellent cycle performance. The phosphate ester/phosphite ester compound has chemical structural formulas shown by theformulas (I) and (II) which are described in the specifications.

This invention relates to novel flame retardants (FR) resulting from the reaction of (a) or (b) with (c) where (a) is a compound containing at least one amine group and with at least one sixteenth of the amine molecules having at least one methylol bond, (b) is a phenol with at least one sixteenth of the phenol molecules having at least one methylol bond, and (c) is a mineral acid, organic acid, and organo-phosphorous acid, or a mixture thereof and optionally adding a polyhydric compound and/or optionally adding formaldehyde to the acid. These compositions are for use in general flame retardant applications such as coatings, adhesives, and articles made of polymeric materials. The FR mechanism by which these compounds generally perform as an FR agent is intumescence but the field of this invention is not restricted to that mechanism. Some of the compounds have substantial intumescence and others have very little intumescence but still are flame retardants.

The invention discloses a preparation method of a full biodegradation film, which takes poly adipic acid/polybutylene terephthalate (PBAT) and starch as base materials, poly-epsilon carpolaction (PCL), epoxidized soybean oil (ESO), and phosphorous acid dialkyl ester as plasticizers, and montmorillonoid or calcium carbonate, talcum powder and the like as inorganic fillers. The method comprises the steps that modification and pelleting are performed in a twin screw; modified resin is added to a film blowing machine for film blowing; and the full biodegradation film can be obtained finally. The full biodegradation film produced by the method is better in physical characteristic, can be directly prepared into a film bag, and can serve as a daily-used packaging film, a waistcoat bag, a food packaging bag and the like; the preparation method of the full biodegradation film is simple in technology, and easy to control, and is suitable for industrial mass production; the film bag produced by the method is high in strength, can be biodegraded fully after use, and is easy to dispose; and environmental pollution is reduced.

The invention discloses a preparing method of titanium-system catalyst of polyester, which is characterized by the following: reacting titanic acid ester and 2-hydroxy carboxylic compound and organic phosphonic acid compound; making the product react with at least one phosphorus compound of phosphoric acid, phosphorous acid, hypophosphorous acid, phosphate ester or phosphite ester; fitting for polyester industry.

The discharged exhaust gas during the glyphosate acid production process through phosphorous acid alkyl acid includes 20-90% of methyl chloride, methanol, formaldehyde dimethyl acetal, water, hydrogen chloride and other foreign matter, by solvent absorption of foreign matter, condensation impurity or charging part of the foreign matter such as methanol, formaldehyde dimethyl acetal into hydrochloride-containing liquid and converting it into methyl chloride, high purity of methyl chloride can be obtained. The process not only solves the problem of environmental pollution in the glyphosate acid production, the production cost can also be lowered substantially.

The invention relates to a process for the preparation of 4-amino-1-hydroxybutylidene-1,1-bisphosphonic acid and of the trihydrated monosodium salt thereof, consisting of reacting 4-aminobutyric acid with a phosphonation mixture formed by phosphorous acid and methanesulfonic anhydride and thereafter hydrolyzing the product of said reaction and isolating the products by adjustment of the pH.

The preparation process of functional polyolefin resin includes electronic beam or gamma-ray pre-irradiation treatment of functional polyolefin resin; mechanical mixing of polyolefin resin after pre-treatment, functional monomer and electron donor reagent; and reacting extrusion for the polyolefin resin in molten state and functional monomer to produce grafting reaction. The polyolefin resin includes polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-styrene copolymer, polystyrene, etc; the functional monomer is unsaturated organic acid or its derivative with amino group, isocyanate, hydroxyl group or other reactive functional group; and the electron donor reagent includes electron-rich compound with P, N, S or O element, p-benzoquinone, triphenyl phosphite, triphenyl phosphate, etc.

Flame retardant compositions, and compositions that comprise an organic polymer and the flame retardant composition are disclosed. The flame retardant compositions are prepared by reacting ethylene diamine with polyphosphoric acid; or reacting an ethyleneamnine or a mixture of ethyleneamines with phosphoric acid, polyphosphoric acid, pyrophosphoric acid, or mixtures thereof. A 10% by weight solution of the product in water has a pH between about 2.5 to 6.0. The flame retardant compositions are non-halogen containing flame retardant compositions and do not gas undesirably during processing at temperatures of 235° C. or even higher.

The invention discloses a preparation method of high-mechanical property halogen-free fire-retarding PBT composite material. The preparation method comprises the following steps: (1) weighing, (2) mixing and (3) mixing milling and extrusion. The invention also discloses a composite material prepared through adopting the method. The composite material comprises the following components: PBT, ultrafine glass fiber, hindered phenol antioxidant, organic phosphorous acid ester, toughening agent, fire retardant A, fire retardant B and lubricant. The composite material has the advantages that: the fire-retarding performance of the composite material reaches to UL94V-0(0.8mm) grade, and the composite material has more outstanding mechanical property than the prior halogen-free fire-retarding system; meanwhile, because the mechanical property is equivalent to that of a halogen-containing fire-retarding system, the composite material can completely replace the prior halogen-containing fire-retarding product and halogen-free fire-retarding product; moreover, the composite material, which has simple preparation method and is easy to operate, can be widely used in household appliance spare parts and electronic product accessories, etc, and particularly in cooling fans in the IT industry.