19 results about "Potassium oxalate" patented technology

The invention belongs to the technical field of pharmaceutical chemical processes, and particularly relates to a preparation method of a penem antibiotic intermediate 4-BMA, which comprises the following steps: adding Zn powder, chlorosilane, aliphatic tertiary amine, zinc salt and 4-AA in a formula (I) into THF (tetrahydrofuran), uniformly stirring, dropwise adding a THF solution of alpha-haloamide with an induction group in a formula (II) for reaction, filtering the reaction solution, removing the zinc powder, and drying to obtain the penem antibiotic intermediate 4-BMA. Extracting the filtrate to obtain a THF phase, washing with an aqueous solution of potassium oxalate, and recovering THF to obtain a formula (III); and carrying out oxidative hydrolysis, sulfur dioxide quenching, sulfur dioxide acid regulation crystallization and recrystallization on the formula (III) to obtain the intermediate 4-BMA. According to the preparation method disclosed by the invention, a zinc salt is used as a catalyst during preparation of the formula (III), potassium oxalate is used for removing residual Zn (II) in a THF phase, SO2 is used for quenching hydrogen peroxide and acid regulation and crystallization of 4-BMA, the oxygenolysis problem of 4-BMA is solved, and the preparation method has the characteristics of greenness, safety and high efficiency, is strong in product competitive advantage and is suitable for industrial production.

The invention discloses biomass porous carbon material loaded iodine as well as a preparation method and application thereof. The preparation method comprises the following steps: pretreating a biomass material: firstly pickling and then washing to be neutral; the method comprises the following steps: uniformly mixing a biomass material, a pore forming agent, a nitrogen source and water, and pre-carbonizing in a nitrogen or inert gas atmosphere to obtain yellow powder, with the pore forming agent being potassium oxalate and the nitrogen source being melamine; carbonizing the yellow powder at 600-900 DEG C in a nitrogen or inert gas atmosphere, cooling to room temperature to obtain black powder, washing and drying to obtain a biomass porous carbon material; the method comprises the following steps: mixing the biomass porous carbon material and iodine elementary substance, heating in a closed environment to sublimate the iodine elementary substance and absorb iodine by the biomass porous carbon material, cooling to room temperature, preserving heat at 50-65 DEG C in an open environment for at least 12 hours, and cooling to room temperature to obtain the biomass porous carbon material loaded iodine. The battery obtained by loading iodine on the biomass porous carbon material still has good cycle life and relatively high capacity retention rate under high rate.

The invention relates to the technical field of bioengineering, in particular to a preparation method and application of an antibacterial peptide, and the amino acid sequence of the antibacterial peptide is shown as SEQ ID No: 1 and is named as L8. The preparation method of the antibacterial peptide L8 comprises the following steps: S1, obtaining an L8 target gene segment; connecting an L8 target gene segment with a pLC vector to obtain a connection product; transforming the connection product into an escherichia coli DH5-alpha competent cell, and screening positive clones to obtain a pLC-L8 recombinant plasmid; s2, taking the pLC-L8 recombinant plasmid as a substrate, and carrying out cell-free protein synthesis reaction to obtain the antibacterial peptide L8, the cell-free protein synthesis system comprises 175 mM of potassium glutamate, 10 mM of ammonium glutamate, 2.7 mM of potassium oxalate, 33 mM of PEP, 38 mM of compound amino acid, 10 mM of magnesium glutamate, 2% (w / v) PEG-8000, 5 nM of pLC-L8 recombinant plasmid, 11.25 mM of lactose, 33.33% (v / v) of crude extract, 100 mg / mL of escherichia coli tRNA and 2.5 nM of T7 RNA polymerase. The antibacterial peptide L8 is obtained by optimizing the antibacterial peptide LRGG, and compared with the LRGG, the antibacterial peptide L8 subjected to cell-free protein synthesis reaction expression has better antibacterial activity and biological safety.

The preparation method comprises the following steps: dissolving titanium potassium oxalate in water, sequentially adding ammonium sulfate and sodium chlorite, uniformly stirring to obtain a homogeneous mixed solution, and dropwise adding concentrated sulfuric acid to obtain a precursor solution; and carrying out hydrothermal reaction on the precursor solution, alternately washing the obtained precipitate with water and ethanol, and drying to obtain the efficient titanium dioxide photocatalyst. By accurately regulating and controlling the use amount of sodium chlorite, accurate regulation and control on the crystal phase composition of the product are successfully realized, and the prepared powder is in a blocky particle shape and has excellent monodispersity. According to the preparation process, subsequent high-temperature calcination or complex modification steps are not needed, energy consumption is reduced, doped element loss is avoided, the preparation process is simple and economical, and meanwhile the photocatalytic performance of titanium dioxide is remarkably improved. Compared with a commercial P25 photocatalyst, the double-phase titanium dioxide photocatalyst prepared by the invention has efficient degradation performance.

Desensitizing oral care composition useful for treating dentinal hypersensitivity, comprising potassium oxalate and methods of use thereof. Delivery systems including a strip of material and such oral care compositions for the treatment of dentinal hypersensitivity and methods of use thereof.

Disclosed in the present invention are the preparation and use of a supported photo-Fenton catalyst. The preparation method comprises: I, formulating a sodium tungstate solution and a potassium oxalate solution, adjusting the pH until acidic, and performing a hydrothermal reaction and calcination to obtain a tungsten trioxide composite material; II, formulating a sodium tungstate solution and an ammonium ferrous sulfate solution; III, ultrasonically dispersing the tungsten trioxide composite material in the ammonium ferrous sulfate solution to obtain a suspension; and IV, under continuous stirring, adding the sodium tungstate solution into the suspension in a dropwise manner, stirring same, performing a hydrothermal reaction, and washing and drying same to obtain a tungsten trioxide / iron tungstate nano material. In the present invention, an FeWO4 / WO3 heterojunction is formed by using a hydrothermal synthesis method, which improves the separation efficiency of carriers and the photo-Fenton catalyst activity of the tungsten trioxide / iron tungstate nano material, thereby increasing the catalytic efficiency thereof. The catalyst is suitable for the degradation treatment of photocatalyst wastewater or dye methylene blue and methyl violet, and the preparation process is simple and easy to implement, and has low pollution.

The application belongs to the technical field of noble metal separation, and relates to a temperature control type hydrophobic extractant for separating gold (III) in a homogeneous phase and a preparation and extraction method thereof. The extractant is a piperidine ethyl acetate type ionic liquid. The ionic liquid has excellent high selectivity, only has high extraction efficiency on gold (III) in a multi-metal mixed solution, and the extraction efficiency can be as high as 98% and above. The ionic liquid extracted into an organic phase is back-extracted by potassium oxalate to obtain high-purity gold single element, so that the separation and collection of gold are realized. After back-extraction, the ionic liquid can have good cycle efficiency, so that efficient cyclic utilization of the ionic liquid is realized.

The invention relates to a method for producing [ 18 F]SiTATE, encompassing the following steps (a) Providing an eluent solution prepared by dissolving 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane and potassium oxalate in a solvent; (b) Winning [ 18 [F]Fluoride anions using the eluent solution to obtain a solution, [ 18 [F]Fluoride anions contains; (c) Removal of the solvent leaving a residue which[ 18 [F] Fluoride anions contain; and (d) Converting the residue with [ 19 F]SiTATE in an organic solvent to obtain [ 18 F]SiTATE.

The application discloses a welding rod for 1000MPa high-strength steel and a preparation method thereof. The welding rod comprises a coating and a welding core, and the coating is wrapped on the outside of the welding core. The coating powder comprises the following components in parts by weight: 30-35 parts of fluorite, 20-30 parts of dolomite, 5-8 parts of strontium carbonate, 2-5 parts of sodium titanium silicate, 5-10 parts of potassium oxalate, 5-10 parts of atomized ferrosilicon, 2-5 parts of titanium powder, 0.5-1.0 parts of lanthanum cerium fluoride, 1-5 parts of lithium carbonate, 1-2 parts of sodium carboxymethyl starch, 0.5-1.5 parts of copper powder and 8-15 parts of iron powder. The welding rod has excellent all-position welding process performance, the arc is stable during welding, fine droplet transition is presented, the molten slag has moderate fluidity, the welding spatter is small, and the weld formation is fine and beautiful.

This invention relates to the field of dichloromethane waste gas treatment technology, specifically disclosing a molten salt-assisted preparation method for ultra-microporous activated carbon used to remove dichloromethane. The method of this invention includes the following steps: urea, potassium oxalate, chloride salt and coconut shell carbonized material are mixed and ground in different proportions, and then activated at 800℃ for 60 min to obtain a series of ultra-microporous activated carbons. The preparation method provided by this invention can control the pore structure of activated carbon to obtain adsorption materials with excellent dichloromethane purification performance. The material synthesis is simple, the cost is low, and it has the conditions for large-scale production.

Disclosed herein are oral care compositions for improving oral health and / or desensitizing teeth. According to one aspect, there is provided an oral care composition having from about 2% to about 10% by weight of a potassium source comprising potassium nitrate, potassium citrate, potassium oxalate, and combinations thereof; an abrasive comprising calcium carbonate, calcium bicarbonate, or a combination thereof; a fluoride source; and a polyol, wherein all weight percentages are based on the total weight of the oral care composition. The oral care composition may be substantially free or free of silica abrasives.

The invention relates to a preparation method and application of oxaliplatin albumin nanoparticles, and the preparation method comprises the following steps: S1, reacting a dichloro (1, 2-diaminocyclohexane) platinum (II) solution with a silver nitrate solution, removing precipitate to obtain an oxaliplatin precursor ion solution, adding a sodium chloride solution, standing, and filtering to obtain a purified oxaliplatin precursor ion solution; and S2, mixing the purified oxaliplatin precursor ion solution with an albumin aqueous solution, adjusting the pH value to 4.5-5.5, adding a potassium oxalate solution to obtain a mixed solution, carrying out a stirring reaction, and carrying out ultrafiltration purification for a plurality of times to obtain the oxaliplatin albumin nanoparticles. According to the oxaliplatin albumin nanoparticle and the preparation method thereof, a quality controllable method is established by improving a preparation process and optimizing parameters, the oxaliplatin albumin nanoparticle which is low in impurity content, high in proportion of oxaliplatin in total platinum and high in encapsulation efficiency is prepared, a better treatment effect is shown in the aspect of tumor combined treatment, and the clinical application potential of oxaliplatin is improved.

The invention discloses a solution for removing a metal oxide layer and a preparation method and a removal method thereof, and the solution for removing the metal oxide layer comprises 3 to 5 parts of sodium tetraborate, 8 to 15 parts of allyl alcohol polyoxyalkylene ether, 3 to 7 parts of propylene glycol monomethyl ether, 2.5 to 4.5 parts of 2-bromo-2-nitropropane-1, 3-diol, 2 to 3 parts of sodium phytate, 4 to 6 parts of potassium oxalate, 5 to 6 parts of sodium gluconate and 10 to 15 parts of triethanolamine. 1-5 parts of hydrazine sulfate, 10-20 parts of dimethyl sulfoxide and the balance of water. According to the invention, the bond energy of Fe-O, Fe-S and the like is broken by utilizing the synergistic effect of unsaturated compounds, namely allyl alcohol polyoxyalkylene ether alkene and 2-bromo-2-nitropropane-1, 3-diol, and reducing components, namely sodium gluconate and hydrazine sulfate. According to the invention, a penetrating agent sodium tetraborate and a surfactant allyl alcohol polyoxyalkylene ether are used for uniformly accelerating bond breaking, and chelating agents potassium oxalate, sodium phytate and triethanolamine are used for stabilizing a solution and slowly corroding a base material. The hydrogen-absorbing coating has no corrosion to a base material, is close to zero hydrogen absorption, keeps the original mechanical properties unchanged, and has better practicability.

The invention discloses a potassium intercalation metallic transition metal chalcogenide nano array as well as a preparation method and application thereof. The method for preparing the potassium intercalation metallic transition metal chalcogenide nano array comprises the following steps: taking transition metal disulfide and a potassium source compound as raw materials, and forming the one-dimensional potassium intercalation metallic transition metal chalcogenide nano array on a substrate through chemical vapor deposition; wherein the potassium source compound is selected from one or more of potassium carbonate, potassium bicarbonate, potassium oxalate and potassium sulfate. The potassium intercalation metal transition metal chalcogenide nano array prepared by the method disclosed by the invention is flat in surface and can be used as a material of electrodes such as transistors and the like. According to the method of the invention, the resultant product can be adjusted to produce an ohmic contact or a Schottky contact by changing the composition of the precursor material as a raw material.

The application discloses a method for preparing a carbon molecular sieve with adjustable pores from heavy oil by binary activation and application thereof, and belongs to the technical field of biomass resource utilization and water treatment. The method comprises the following steps: (1) mixing heavy oil and a binary activation agent, and forming a carbon-containing precursor mixture after standing; wherein the binary activation agent is calcium citrate and potassium oxalate; (2) pyrolyzing and activating the carbon-containing precursor mixture under an inert atmosphere, and obtaining bio-activated carbon after cooling; and (3) washing and drying the bio-activated carbon to obtain a carbon molecular sieve. The application has the advantages of green environmental protection, convenient process and efficient production. The carbon molecular sieve has developed pore structure, concentrated pore size distribution and good adsorption characteristics, has a wide application prospect in water treatment, and realizes comprehensive disposal of resource utilization of two kinds of pollutants, namely, waste heavy oil and dye wastewater.

The application discloses a preparation method of super-hydrophobic aluminum profiles and application thereof in marine environment and belongs to the technical field of aluminum alloy materials. Firstly, alloy elements are optimized in the application, and secondly, in a key process step, i.e., an anodic oxidation, an anode electrolyte composition is optimized, and a basic electrolyte and a modified additive are arranged. A polyethylene glycol-titanium potassium oxalate-citric acid ternary composite additive is adopted, a double-voltage gradient oxidation process is combined, a multistage composite structure is constructed in an oxidation film, and an aluminum alloy profile with high hardness (>=500HV) and stable super-hydrophobicity (a contact angle >=160 DEG) is realized. The super-hydrophobic aluminum profile prepared by the method has strong corrosion resistance and still maintains excellent performance in an extreme environment, remarkably prolongs the service life of equipment, and improves the safety and stability of offshore facilities.

The invention belongs to the technical field of in-situ detection and preparation of composite nanomaterials, and particularly relates to a composite nanomaterial as well as a preparation method and application thereof. The nano material is a functional nano composite material which is loaded with gold nanoparticles and probe molecules prepared through organic synthesis and is coated with a hyaluronic acid film. The nano-material carrier is prepared by taking potassium permanganate and potassium oxalate as raw materials; the Raman active molecular probe is modified by the gold nanoparticles through a gold-sulfur bond forming principle. The preparation process is simple, the cost is low, the operation is easy, the prepared nano composite material has high sensitivity, high selectivity and excellent biocompatibility, simultaneous detection of SERS channels of two biomarkers, namely GSH and APN, can be realized, and the application prospect is wide. The method can be used for accurately, efficiently and quickly distinguishing normal cells from tumor cells clinically by detecting biomarkers with different contents in the normal cells and the tumor cells.

The invention relates to a sodium-iron-copper-containing activated carbon adsorbent for adsorbing hydrogen sulfide and a preparation method thereof. The adsorbent is prepared from powdered carbon, iron salt, copper salt, sodium salt, potassium oxalate and ammonium ferric citrate through a specific process. The preparation method comprises the following steps: dissolving the raw materials in water to obtain a modified solution; kneading with carbon powder, and performing extrusion molding; and carrying out heat preservation and drying, and activating at 450-650 DEG C in an atmosphere in which the volume ratio of nitrogen to water vapor is (5-10): 1 and the temperature of the water vapor is 150-180 DEG C, so as to obtain the catalyst. The adsorbent adopts sodium, iron and copper ternary synergistic modification, and an additive and an activation process are optimized, so that the adsorbent shows high sulfur capacity (up to 9.2%) and excellent cycle stability (the capacity fading rate after 50 times of regeneration is less than 5%) in a simulated industrial atmosphere with the H2S content of 1-500ppm. After adsorption saturation, regeneration can be realized only by treatment at 120-180 DEG C in a hydrogen sulfide-free atmosphere, no waste liquid is generated in the process, and the regeneration energy consumption is low. The adsorbent is especially suitable for removal and resource recycling of low-concentration hydrogen sulfide such as blast furnace gas and chemical waste gas.

A semiconductor substrate cleaning composition containing: hydrogen peroxide (A), a hydrogen peroxide stabilizer (B) which is at least one selected from the group consisting of oxalic acid, diethylenetriaminepentaacetic acid, hydroxyethyliminodiacetic acid, potassium oxalate, 5-phenyl-1H-tetrazole, triethylenetetraminehexaacetic acid, trans-1,2-cyclohexanediaminetetraacetic acid, 8-hydroxyquinoline, L(+) -isoleucine, DL-valine, L(-) -proline, hydroxyethylethylenediaminetriacetic acid, N,N-bis(2-hydroxyethyl)glycine, glycine, L-tryptophan, 2,6-pyridinedicarboxylic acid, benzothiazole, and DL-alanine, an alkali compound (C) which is at least one selected from the group consisting of quaternary ammonium hydroxide (C1) and potassium hydroxide (C2), and water.