586 results about "Sodium carbonate anhydrous" patented technology

The invention discloses a method for preparing poly(arylene ether nitrile) resin powder, and belongs to the technical field of high polymer materials. 2,6-dichlorobenzonitrile and aromatic dihydric phenol are taken as raw materials, 1-methyl-2-Pyrrolidinone is taken as a solvent, anhydrous potassium carbonate or anhydrous sodium carbonate is taken as a catalyst, and methylbenzene or dimethylbenzene is taken as a dehydrating agent; and the method comprises the following steps of: performing reflux reaction at the temperature of between 130 and 160 DEG C for 2 to 4 hours in a reactor, slowly evaporating out water and the dehydrating agent, and raising the temperature to 180-200 DEG C until a macromolecular rod-climbing phenomenon happens; adding the solvent into the reactor, and diluting the reaction products to the mass concentration of 2 to 15 percent; and adding a precipitator into the reactor, continuously stirring, performing centrifugal solid-liquid separation, washing the solid in acidic boiling water, filtering and drying to obtain the poly(arylene ether nitrile) resin powder. The prepared poly(arylene ether nitrile) resin powder has the characteristics of superfine granularity (reaching 100-400 meshes), uniform granularity, high purity, stable performance, and excellent electrical property, and can be widely applied in the fields such as electronics, precision machines, aerospace, new energy and the like.

The invention discloses a preparation method of SiO2 aerogel-filled carbon aerogel. The preparation method is characterized by comprising the following steps: (1) preparing carbon aerogel, namely taking resorcinol (R) and formaldehyde (F) as precursors (the molar ratio of R to F is 1 : 2), anhydrous sodium carbonate as a catalyst and carbon foam as a framework, and preparing the carbon aerogel based on the carbon foam; (2) performing acid treatment on the surface of the carbon aerogel, namely mixing H2O2, NH3H2O and H2O according to a volume ratio of 1 : 1 : 5 to form a mixed solution, and soaking the carbon aerogel in the mixed solution under the water-bath condition at 90 DEG C for 1 hour; (3) preparing a SiO2 precursor solution, soaking the carbon aerogel in the precursor solution, ageing and drying to obtain the SiO2 aerogel-filled carbon aerogel. The preparation method is reliable and good in safety; the prepared composite aerogel keeps good performances of the aerogel and improves the mechanical performance of the aerogel; the surface of the composite aerogel is hydrophobic, so that moisture in the air is not easily absorbed and the shrinkage rate is low.

The present invention discloses a cefotiam hydrochloride medicament composition sterile powder injection, including 500 to 600 weight shares of cefotiam hydrochloride and 110 to 150 weight shares of anhydrous sodium carbonate. The cefotiam hydrochloride medicament composition sterile powder injection has advantages of a good stability and a high purity. The invention also discloses a method for preparing the cefotiam hydrochloride medicament composition sterile powder injection, including steps of weighing the cefotiam hydrochloride and the anhydrous sodium carbonate according to the formula amount separately and mixing them in a sterile container uniformly. The method is simple, and the cefotiam hydrochloride prepared by the above method has a good stability.

The present invention belongs to the field of chemical technology, and especially one kind of copper base catalyst with nanometer carbon material as co-catalyst for vapor reformation of methanol to prepare hydrogen and its preparation process. The catalyst is prepared through the process including the steps of: compounding 0.1 M solution of Cu/Zn/Al nitrate; compounding 0.1 M solution of sodium carbonate, dropping the 0.1 M solution of Cu/Zn/Al nitrate and 0.1 M solution of sodium carbonate in the same rate into reactor with nanometer carbon material for co-precipitation under strong stirring and 60 deg.c to obtain carbonate coprecipitate containing nanometer carbon material; washing, drying, roasting, etc. The prepared catalyst has unique porous structure of great specific surface area, high low temperature activity and high hydrogen selectivity, and may be used in preparing reformed product with hydrogen content up to 75 % and CO content lower than 0.1 %.

The invention provides a foam oil displacement system with ultralow interfacial tension and a use method of the foam oil displacement system. The oil displacement system is formed by mixing raw materials in percentage by weight as follows: 0.1%-0.3% of a foaming agent, 0.05%-0.15% of an inorganic reagent, 0.01%-0.10% of a foam stabilizer and the balance of water, wherein the foaming agent is dodecyl dimethyl betaine, dodecyl hydroxysulfobetaine, dodecyl hydroxypropyl sulphobetaine, lauramide propyl hydroxysulfobetaine, lauramide propyl betaine, cocamidopropyl dimethylamine oxide, gemini oxidized tertamine, polyoxyethylene dodecanol ether sulfate or sodium dodecyl sulfate; the inorganic reagent is sodium hydroxide, anhydrous sodium carbonate or sodium metaborate; the foam stabilizer is partially HPAM (hydrolyzed polyacrylamide), acrylamide copolymer, PACHV (high-viscosity polyanionic cellulose) or HPMC (hydroxypropyl methyl cellulose).

The invention discloses a preparation method of ceramic bond for a low-temperature high-strength cubic boron nitride (CBN) grinding tool, which comprises the following steps: evenly mixing 35-75% of a, 2-15% of b, 5-20% of c and 5-25% of d by weight percent, grounding and sieving, melting at 1200-1400 DEG C for 1-6h, carrying out water quench, drying, secondary grinding and secondary sieving to obtain basic ceramic bond, and evenly mixing the obtained basic ceramic bond with nano oxide the weight of which accounts for 0.2-15% of that of the basic ceramic bond to obtain the ceramic bond of theinvention, wherein the a is silica or silicon dioxide, the b is aluminum hydroxide or aluminum oxide, the c is anhydrous sodium carbonate or sodium oxide, and the d is boric acid or boron trioxide. Through adding nano oxide to the basic ceramic bond, the refractoriness of the basic ceramic bond is reduced by 10-50 DEG C, the fluidity is improved by 5-25%, and the breaking strength is improved by 5-45%.

The invention relates to an aseptic powder injection of cefamandole nafate and a preparation method thereof; the aseptic powder injection of cefamandole nafate comprises cefamandole nafate and anhydrous sodium carbonate; after the improvement of the preparation technology, the dosages of auxiliary material are small, and therefore the aseptic powder injection of cefamandole nafate obtained is good in stability and low in cost. The synthetic process of the drug material of cefamandole nafate adopted by the invention has simple operation process, low material cost and moderate reaction conditions; the cefamandole nafate produced has high purity and high productive rate.

The invention discloses polybenzimidazole containing an ether ketone/ether sulfone structure and a sulphonated polymer and a preparation method thereof. The chain structure of a polybenzimidazole polymer containing the ether ketone/ether sulfone structure also has the structure of ether ketone or ether ether ketone or ether sulfone and imidazole; besides the structure of ether ketone or ether ether ketone, the chain structure of the sulphonated polymer of the polybenzimidazole containing ether ketone/ether sulfone structure also has the structure of sulfonic group and imidazole. The preparation method adopts the steps that a bisphenol-bisbenzimidazole monomer and a difluoro monomer or a fluoride bearing monomer are used as the raw material, anhydrous sodium carbonate or anhydrous potassium carbonate is used as the catalyst, nucleophilic condensation polymerization reaction is performed in an aprotic polar solvent, and after the reaction liquid is post-treated, the polybenzimidazole polymer of the sulphonated polymer containing ether ketone/ether sulfone structure is obtained. The polymer obtained through the invention has good oxidation resistance, thermostability, acidproof and alkali proof stability, and alcohol inhibition performance, and the synthetic method is simple, thereby the polybenzimidazole has broad application prospect.

The invention relates to a method for measuring the element content in an iron alloy and a pretreatment method of a sample of the iron alloy, and belongs to the field of element detection and analysis. The first technical problem to be solved is to provide a sample pretreatment method for measuring the element content in the iron alloy. The sample pretreatment method for measuring the element content in the iron alloy comprises the steps of a, melt reaction, namely performing the melt reaction on an alkali mixed solvent for the iron alloy sample to obtain molten globules or frits, b, grinding, namely crushing, grinding and sieving the molten globules or frits obtained in the step a, thereby obtaining powder, and c, tabletting, namely taking the alkali mixed solvent as a substrate and tabletting the powder obtained in the step b, thereby obtaining the pretreated sample of the iron alloy sample, wherein the alkali mixed solvent is composed of anhydrous sodium carbonate and anhydrous boric acid. The sample pretreatment method has the characteristics of simpleness and fastness, easy operations, few matrix interference factors, high quantitative determination accuracy and precision, and the like.

The invention relates to a method for preparing praziquantel, which is characterized by comprising the steps: (1) isoquinolin, sodium cyanide or potassuim cyanide and triethylamine or pyridine are added into a reactor to react, and yellow solid which is a first step product is obtained; (2) the first step product is added into a high-pressure hydrogenation kettle and filled with hydrogen to react under the action of catalyst, so that a second step product is obtained; (3) after being stirred and dissolved, the second step product and ethyl acetate is added with anhydrous potassium carbonate or anhydrous sodium carbonate, and then is stirred at the room temperature and dripped with chloracetyl chloride to be stirred at the room temperature to react, so that the solid obtained in the reaction is crude product of the praziquantel, and fine product is obtained by recrystallization of absolute methanol. Compared with the prior art, the method has the advantages of shortening the reaction process, reducing the energy consumption, improving the overall yield, etc.

The invention discloses a preparation method of an ice melting agent for transformer substations. The method comprises the following steps: 1) in the stirring state, sequentially adding 26-34 wt% of propanediol and 46-52 wt% of diethylene glycol into a container, and sufficiently dissolving by continuing stirring; 2) in the stirring state, sequentially adding 1-3 wt% of triethanolamine and 2-4 wt% of anhydrous sodium carbonate, stirring and sufficiently dissolving; 3) in the stirring state, adding 13-18 wt% of deionized water into the completely dissolved solution until the pH value of the solution is 6.5-7.2; 4) after stirring for 30 minutes, standing for 4 hours; and 5) finally, filtering with a 1-micrometer filter, and subpackaging. By adopting the nano technique, the pH value of the ice melting agent for transformer substations is approximate to 7, and thus, the ice melting agent is not corrosive to power equipment and does not have any toxic effect on the environment.

The invention provides a method for preparing a hydrocalumite based heat stabilizer from calcium-aluminum hydroxide and an application of the hydrocalumite based heat stabilizer and belongs to the technical field of preparation of polyvinyl chloride. According to the method, the hydrocalumite based heat stabilizer is prepared from the calcium-aluminum hydroxide and anhydrous sodium carbonate serving as raw materials with deionized water as a solvent. The method specifically comprises steps as follows: calcium hydroxide and aluminum hydroxide are dissolved in deionized water and quickly stirred at the room temperature, anhydrous sodium carbonate is added to reactants, the mixture is quickly stirred continuously, a reaction system is transferred to an oil-bath pan for heating and refluxing, and the product hydrocalumite based heat stabilizer is obtained after post-treatment. The prepared novel hydrocalumite can effectively serve as a novel environment-friendly and non-poisonous PVC (polyvinyl chloride) heat stabilizer, raw materials are easy to obtain, the price is low, the hydrocalumite based heat stabilizer is synthesized directly in simple steps, and the target product meets requirements of green chemistry and is environment-friendly.

The invention discloses high-strength large-size block carbon aerogel and a preparation method and application thereof, and belongs to the technical field of carbon aerogel preparation. Resorcinol and formaldehyde are taken as raw materials, anhydrous sodium carbonate is taken as a catalyst, deionized water is a solvent, a sol-gel reaction is carried out, and normal-pressure drying and high-temperature carbonization are preformed to obtain high-strength large-size block carbon aerogel. The size of the block carbon aerogel is no less than 100 mm*100 mm*30 mm. With density variation of carbon aerogel, the size of carbon particles is adjustable between 30-800 nm. The carbon particles are mutually connected to form a three-dimensional network skeleton structure. The prepared carbon aerogel has the density of 0.3-0.6 g/cm<3>, the compression strength as high as 10-65 MPa, and the thermal conductivity of 0.06-0.09 W/(m*K), and can be directly applied to a heat insulation material.

The invention relates to dried prepare sodium percarbonate with active oxygen content at least 10 wt% and prefers to 13.5~15.2 wt%, and belongs to preparation technology field for peroxyacid salt in inorganic chemistry. Wherein, spray the hydrogen dioxide solution with varying speed to soda without water for reaction; drying and granulating the production to obtain the objective production. This invention is simple to control the active oxygen content and density and fit to different market require.

The invention provides a cleaning agent that is applicable to clean hollow fiber ultrafiltration membrane, which comprises the compounds (percentage by weight): anhydrous sodium carbonate accounts for 25-45 percent, trisodium phosphate accounts for 5-20 percent, anhydrous sodium sulfate accounts for 2-5 percent, ethylene diamine tetraacetic acid tetrasodium salt (EDTA-4Na) accounts for 5-15 percent, sodium percarbonate accounts for 0-33 percent, emulsifying agent SAS accounts for 8-15 percent, peregal-25 accounts for 0-5 percent and dodecyl sodium sulfate accounts for 4-10 percent. The compounds are added into an enamel reactor with a stirrer and a grinder in sequence to be stirred for 2-3 hours, thus obtaining the cleaning agent through grinding the mixture evenly. The invention has simple preparation and is particularly applicable to clean hollow fiber ultrafiltration membrane such as ultrafiltration oily wastewater, organic wastewater, protein concentration, etc.; the invention has strong decontamination direction, high effect and low cleaning cost.

The invention discloses an analysis fluxing agent for melting metallurgical samples, and a preparation and using method thereof; the analysis fluxing agent is prepared with a main fluxing agent and an auxiliary fluxing agent, wherein, the contents of anhydrous sodium carbonate and boric acid reach 85.80% to 100%; the content of the auxiliary flux agent nitrate ammonium or potassium nitrate is 0 to 14.20%; the invention can be used to melt and decompose vanadium-titanium magnetite, vanadium-titanium-bearing slag, high-titanium slag, metallurgical auxiliary material, refractory material, vanadium slag, non-ferrous metal ores and other metallurgical samples; the flux agent of the invention has the advantages of less material adoption, simple preparation method, low cost, simple operation, short melting time, as well as good melting and decomposition effect; the melted samples are of easy acid leaching and decomposition, wide application and convenient using.

The invention relates to MOFs (Metal-Organic Frameworks) with ph stability. The chemical formula of the MOFs is {[Zn2.5(nbta)(trz)2(H2O)].3H2O}n, wherein the nbta is 5-nitro-1,2,3-benzene tricarboxylic acid radical ions, and trz is 1H-1,2,4-triazole; the preparation method comprises the following steps: adding zinc nitrate, the 5-nitro-1,2,3-benzene tricarboxylic acid radical ions and the 1H-1,2,4-triazole into a water solution, using anhydrous sodium carbonate to regulate the PH value, reacting for 72 h at the temperature of 80 DEG C, conducting filtration and washing, and obtaining the target product; the MOFs can be used for selective adsorption separation of the CO2/N2. The MOFs have the advantages that the preparation technology of the MOFs is simple, the operation is easy, the cost is low, the period is short, the productivity is high, the prepared MOFs have better ph stability and further have better selective adsorption separation performance on the CO2/N2.

The invention discloses a method for producing poly(pentabromobenzyl acrylate). The method comprises the following steps of: adding ethylene glycol monomethyl ether, acrylic acid, hydroquinone and anhydrous sodium carbonate into a reaction kettle; reacting at the temperature of between 35 DEG C and 45 DEG C until no bubbles are produced; heating to reach the temperature of between 100 DEG C and 120 DEG C; adding pentabromobenzyl bromide to react to obtain pentabromobenzyl acrylate; adding the ethylene glycol monomethyl ether and the prepared pentabromobenzyl acrylate into the reaction kettle; introducing nitrogen gas and stirring; heating to reach the temperature of between 90 DEG C and 110 DEG C; adding a mixed solution of dicumyl peroxide and glycol ether; polymerizing for 1.5 to 2.5 hours and then heating to reach the temperature of between 110 DEG C and 126 DEG C; and continuously reacting for 2 to 5 hours to prepare the poly(pentabromobenzyl acrylate). A product prepared by the method has the advantages of superior performance, no separation, no migration, extremely low influence on properties of materials, capability of increasing productivity, high mechanical property, high anti-ultraviolet stability and high thermal stability.

The invention belongs to the technical field of adsorption materials, and discloses a modified silica airgel microsphere, a preparation method and an application thereof. The preparation method is as follows: use an acid solution to adjust the pH value of the alkaline silica sol to 2-3, then add a cyano-containing alkoxysilane compound, and add absolute ethanol under stirring conditions to obtain a mixed precursor; The mixed precursor is added to the oil phase under stirring conditions to obtain a water-in-oil emulsion, and then ammonia water is added, stirred and mixed evenly, and then allowed to stand for layering, and the lower layer of sediment is removed, washed and dried to obtain a cyano-modified silicon dioxide aerosol Glue microspheres; then added to the hydroxylamine hydrochloride solution dissolved with anhydrous sodium carbonate for reaction, the product was washed and dried to obtain the modified silica airgel microspheres. The invention prepares silica airgel microspheres and performs amidoxime modification on them, and has the advantages of high specific surface area and good adsorption performance.

The invention discloses a low-temperature dyeing method for an aramid/fire-retardant viscose blended fabric, which comprises the steps of: preparing pre-treatment solution; placing an aramid/fire-retardant viscose blended fabric which needs to be dyed into the prepared pre-treatment solution for pre-treatment; compounding to obtain a dyeing assistant; taking a dye which accounts for certain weight percentage of the pre-treated aramid/fire-retardant viscose blended fabric, then taking a dispersant NNO, an electrolyte, anhydrous sodium carbonate, a wetting agent and the prepared dyeing assistant respectively, and preparing the raw materials into dye solution with the pH value of between 4.0 and 5.5; and placing the pre-treated aramid/fire-retardant viscose blended fabric into the prepared dye solution for dyeing, and then finishing the dyeing of the aramid/fire-retardant viscose blended fabric through the afterfinish. The dyeing method can perform integral one-bath dyeing on the aramid/fire-retardant viscose blended fabric, and ensure that the fabric has bright color, lower cost and unlimited color varieties and the fabric has better homochromatism.

The invention discloses a high-ultraviolet high-infrared reflective material and a preparation method thereof. In the invention, a zinc source, phosphoric acid and anhydrous sodium carbonate are used as raw materials to form a zinc sodium phosphate base material, and oxides of metal and rare-earth elements and one or more salts of metal and rear-earth elements are used as adulterants and mixed into the zinc sodium phosphate base material to prepare a high-ultraviolet high-infrared reflective zinc sodium phosphate material; and by taking barium sulfate as a 100 percent datum reflectivity, the ultraviolet reflectivity of the high-ultraviolet high-infrared reflective material is 90-105 percent, the reflectivity of infrared ray with wavelengths of 800-2,000nm is 110-120 percent, and the reflectivity of infrared ray with wavelengths of 2,000-2,500nm is 130-150 percent. The method not only has high infrared reflection, but also can be used for reflecting ultraviolet light harmful to the human body, and can achieve the effects of saving energy and benefiting to the human health.

The invention relates to a method for producing white carbon black by using FCC waste catalyst as raw material. The method is to mechanically activate the spent FCC catalyst and add anhydrous sodium carbonate as a roasting aid, and reduce the roasting temperature through mechanochemical reaction. The calcined product is leached and filtered, aged in a water bath to achieve the separation of silicon and aluminum, and finally washed and dried to obtain white carbon black that meets the relevant standards for use. This process combines mechanochemical reaction, low-temperature roasting and wet leaching process, and realizes the goal of producing white carbon black at low cost by using FCC waste catalyst. The outstanding feature of the present invention is that the process is simple, the production cost is low, the comprehensive utilization of waste can be realized, and it can be widely used in the waste catalyst treatment industry produced in the process of lightening heavy oil.