92results about How to "Moderate reaction conditions" patented technology

The invention discloses a method for preparing high-purity manganese sulfate and high-purity manganese carbonate by reduction leaching of pyrolusite through scrap iron. The method comprises the following steps of: performing reduction leaching on the pyrolusite with the scrap iron in a sulfuric acid medium to obtain manganese, regulating the pH value to be 5-6 by using a neutralization method, hydrolyzing ferric iron in the solution into an iron hydroxide precipitate, and filtering to obtain primary filtrate of manganese sulfate and filter residue; adding a vulcanizing agent into the primary filtrate for vulcanization to remove heavy metal ions, adding a fluorinating agent for removing calcium, magnesium and other ions in the solution, standing the solution and removing sediments; and concentrating and crystallizing the purified solution to prepare the high-purity manganese sulfate, or adding ammonium carbonate to prepare high-purity manganese carbonate, concentrating the filtrate and recovering the ammonium carbonate, wherein the filter residue in the first step is leached by solution of dilute sulfuric acid, and the filtrate after filtration is subjected to calcium removal, standing and concentration to form polyferric sulfate. The method is low in cost and investment, is suitable for comprehensive exploitation and utilization of different grades of pyrolusite, can effectively utilize natural resources and also can create obvious economic benefit.

The invention discloses a catalyst for preparing C2-C6 low-grade aliphatic amine. The catalyst comprises a carrier and an active component, wherein the active component accounts for 10 to 60 percent of the total weight of the catalyst, and the active component is Co or consists of Co, Ni and Fe. The invention also discloses a method for producing the catalyst, which comprises the steps of putting the carrier into an aqueous solution of the active component for impregnation, loading the active component onto the carrier, drying the impregnated carrier at a temperature between 100 and 180 DEG C and then decomposing the carrier at a temperature between 250 and 550 DEG C, using hydrogen to perform reduction treatment at a temperature between 250 and 650 DEG C and obtaining the catalyst. The catalyst adopted to prepare the C2-C6 low-grade aliphatic amine can be more beneficial to the generation of tertiary amine.

The invention discloses a polycarboxylate superplasticizer with high water retention and a preparation method thereof. The polycarboxylate superplasticizer with high water retention is prepared from, by weight, 100 parts of TPEG, 8.3-12.5 parts of MPEG-MA, 10.1-11.2 parts of unsaturated carboxylic acid, 0.8-1.4 parts of organosilicone monomer, 0.7-1.1 parts of an oxidizing agent, 0.2-0.3 part of a reducing agent, 0.3-0.4 part of a chain transfer agent, 163-172 parts of deionized water and liquid alkali for making pH to 5.5-6. The polycarboxylate superplasticizer with high water retention has high slump under the condition of low dosage, workability of concrete can be improved, and water-retention and tackifying effects are achieved. Meanwhile, reaction condition is suitable, the reaction is normal-temperature reaction without heat source, and the technology is concise, environmentally friendly and highly efficient and is suitable for a large-scale industrial production method.

The invention discloses sitagliptin phosphate impurities, a method for preparing the same and application of the sitagliptin phosphate impurities. The sitagliptin phosphate impurities are sitagliptin phosphate impurities A, sitagliptin phosphate impurities B and sitagliptin phosphate impurities C. The relevant sitagliptin phosphate impurities, the method and the application have the advantage of important monitoring significance on industrial production of sitagliptin phosphate crude medicines.

The invention discloses a method and a device for removing heavy metals and POPs in organic wastes by electromagnetic reinforcement. The method comprises the following steps of: firstly preparing theorganic wastes into slurry; applying a magnetic field to the slurry to make sure that the heavy metals and the POPs in the slurry are transformed into a water solution state; separating the organic waste slurry into two components; afterwards applying an electric field to the slurry, migrating water molecules and the heavy metals and POPs which are continuously transformed into the water solutionstate to a cathode region of the electric field under the effect of electro-migration, and meanwhile migrating the components of the organic wastes to an anode region of the electric field so as to realize separation of the two components; and filtering and dehydrating the organic waste slurry to finally obtain harmless low-water-content organic wastes. The method and the device disclosed by the invention can be used for efficiently removing large-particle impurities, some heavy metals and the POPs in the organic wastes, can also reduce the water content of the organic wastes to 30% to 50%, thereby overcoming the defects that a traditional organic waste treatment method is low in efficiency, takes effect slowly and has no oneness.

The invention discloses a sea cucumber-traditional Chinese medicine extract with kidney-invigorating and essence-replenishing functions as well as a preparation technology thereof and belongs to the technical field of marine-life health food. The sea cucumber-traditional Chinese medicine extract takes fresh sea cucumbers as the raw material and the preparation technology thereof comprises the following steps: sequentially soaking the sea cucumbers by low-concentration alkali and acid solutions after enzymatic degradation, so that the hydrogen bonds between and in the nutrient molecules of the sea cucumbers are cross-linked, the ion branched chains are opened, the crosslink bonds are damaged after soaking of a certain period of time and the nutrient molecules are further hydrolyzed into low-molecular forms such as peptones, peptides, amino acids and the like; thus, the sea cucumbers can be better absorbed by human body. According to the preparation method, the polypeptide yield can be up to higher than 12.0%, the polysaccharide yield is higher than 14% and the degree of hydrolysis is higher than 35%. Moreover, the medicinal and edible Chinese herbal medicines, including radix pseudostellariae, white atractylodes rhizome, Poria cocos, prepared rehmannia roots, ledebouriella roots, roots of herbaceous peony, seeds of Chinese arborvitae, poria with hostwood, astragalus roots, chrysanthemum flowers and the like, are rationally added as accessory materials. The preparation technology is advanced in production process and strong in operability. Furthermore, a special biological fermentation process is utilized, so that the sea cucumbers are improved in flavor and the sea cucumber-traditional Chinese medicine extract is rich in nutrition structure. The sea cucumber-traditional Chinese medicine extract can be used for treating essence deficiency, kidney deficiency, blood deficiency, strength exhaustion, soreness and weakness of waist and knees as well as blood lipid abnormality. Thus, the sea cucumber-traditional Chinese medicine extract is an ideal warm-supplementation health food.

The invention relates to a method for preparing a high-purity lead-acid barium conductive material for a lead-acid storage battery, in particular to a lead-acid barium conductive material applied to a lead-acid storage battery. Lead monoxide and barium oxide are used as main raw materials; and the material is prepared by the steps of proportioning, salinization, co-precipitation, drying, sintering, crushing and the like. The lead-acid barium material is a powdery material with good electric conductivity, and can be used as a conductive additive and applied in a storage battery polar plate. The internal resistance of the battery is reduced, the initial capacity of the battery is increased, and good charge receiving capacity is obtained.

The invention discloses a spandex blended fiber. The fiber is formed by blending, by mass, 85% of 20S cotton fiber and 15% of 40D modified spandex fiber, wherein the modified spandex fiber comprises,by weight, 8-12 parts of 4,4'-methylenediphenyl diisocyanate, 40-45 parts of polytetramethylene ether glycol, 0.8-1 part of a chain extender, 0.1 part of a stabilizer, 1.5-2 parts of diethylamine serving as a terminator, 0.1-0.2 part of quaternary ammonium salt and 3-5 parts of a modified additive. The blended fiber is good in dyeing performance on the premise of good air permeability and mechanical strength, and meanwhile, the antibacterial property is good.

The invention relates to a method for preparing a maleic anhydride type polycarboxylic acid water reducing agent and application. The method specifically comprises the following steps of: adding methyl allyl polyethenoxy ether, maleic anhydride, de-ionized water and sulfonate-containing monomer into a reaction kettle; heating the reaction kettle to 60-85 percent under the condition of continuous stirring; after the reaction kettle is stabilized at 60-85 percent, adding ammonium persulphate at one time under the condition of continuous stirring; preserving heat of the reaction kettle at 60-85 DEG C for 4-7 hours; and cooling to 50 DEG C, adding a certain amount of caustic soda liquid into the reaction kettle to keep the pH (Potential of Hydrogen) at 5.5-6 when the temperature is reduced to 50 DEG C. The invention also protects the prepared maleic anhydride type polycarboxylic acid water reducing agent and the application thereof. The prepared maleic anhydride type polycarboxylic acid water reducing agent has the advantages of proper reaction conditions, concise process, capability of reducing the operation steps, high efficiency, low cost, environmental friendliness, suitability for large-scale industrial production method, superior water reducing agent performance and good slump retaining and slow release performance.

The invention relates to silane modified biochar as well as a preparation method and application thereof. The silane modified biochar is prepared by grafting a silane modifier to biochar in a supercritical fluid medium. The supercritical fluid medium serves as a reaction medium, and the silane modifier having different functional group structures is grafted onto the surface of the biochar, so thatadsorption activity sites on the surface of the biochar can be increased, adsorption capacity of a biochar material is improved, the contained functional groups can undergo a chelation reaction withheavy metal ions, and heavy metal adsorption stability of the biochar is improved. The modified biochar has excellent adsorption efficiency and adsorption stability on the heavy metal ions, and also has wide application prospects in the field of environmental protection. The biochar is modified in a green solvent, namely the supercritical fluid medium, use of an organic solvent is greatly reduced,the process is simple, and the silane modified biochar is environment-friendly, low in cost and capable of easily realizing large-scale popularization and application.

The invention discloses a method for extracting chitin by comprehensively treating and utilizing shrimp and crab shells. The shrimp and crab shells are decalcified by utilizing glutamic acid and deproteinized by utilizing potassium hydroxide, so that chitin meeting an industrial-grade or food-grade requirement is obtained. According to the method, calcium carbonate in the shrimp and crab shells isfirstly converted into soluble calcium glutamate and is then converted into insoluble calcium hydrophosphate (which can be used as a feed additive) while chitin is extracted, so that the recycle of relatively expensive glutamic acid is realized; and meanwhile, an alkaline protein hydrolysate generated in the deproteinization step and an acidic filtrate containing an ammonium salt and phosphate are concentrated after being mixed to obtain a liquid fertilizer (which can be used as a foliage fertilizer for plant growth) containing amino acid nitrogen, phosphorus and potassium, so that various byproducts are obtained, many things are achieved at one stroke, the clean production of chitin as well as the all-component and high-value comprehensive treatment and utilization of the shrimp and crabshells are realized, no environmental pollution is caused, reaction conditions are appropriate, the problems of resource waste and environmental pollution in a traditional process are solved, and theapplication prospect is wide.

The invention discloses a manganese-containing cobalt-based complex oxygen carrier and a preparation method thereof. The oxygen carrier is composed of Co3O4 and MnO2, wherein the mass percentage of the Co3O4 is 95%, and the mass percentage of the MnO2 is 5%. According to the invention, by adopting a sol-gel method and controlling appropriate reaction conditions, a manganese-containing cobalt-based complex oxygen carrier with a uniform particle size and good dispersion is prepared; and the preparation method of the manganese-containing cobalt-based complex oxygen carrier disclosed by the invention is simple, a prepared complex oxygen carrier has a fast reaction rate, and the oxygen release rate is significantly improved.

The invention discloses a preparation method of clethodim and an intermediate thereof. The preparation method of the intermediate comprises the step of acidifying a compound A to obtain a compound B.According to the invention, the compound B is obtained by acidifying the compound A, and reacts to obtain a compound D, and the compound D reacts to obtain clethodim, so that the reaction condition are mild, the operation is simple, the preparation process of the compounds A-D does not require separation, water washing, layering, rearrangement and other operations, the clethodim preparation process flow is simplified, the reaction time is shortened, the production efficiency is improved, the post-treatment is simple, water washing, layering and other processes are not needed, separation and purification are facilitated, the wastewater treatment burden is not increased, three wastes are reduced, the production cost is reduced, the environmental protection requirement is met, and the methodis suitable for industrial production.

The invention provides a p-chloroaniline hydrochloride preparation method, which comprises: in the presence of an organic solvent azeotropic with water, using p-chloronitrobenzene as a starting raw material, adding anti-dehalogenation agent and an acid binding agent, sealing, introducing hydrogen gas, carrying out a hydrogenation reaction under the catalysis of a platinum-carbon catalyst at a hightemperature under a high pressure, cooling, filtering to remove the catalyst, collecting the filtrate, adding concentrated hydrochloric acid to the filtrate, carrying out thermal insulation for 0.5-2h at a temperature of 80-95 DEG C, continuously heating to achieve a boiling state, refluxing by a water separator until no water is separated, filtering, and drying to obtain p-chloroaniline hydrochloride. According to the present invention, the preparation method has characteristics of mild and controllable reaction conditions, simple operation and low cost, performs the two steps through the one-pot method, and provides the advanced preparation method for industrial production.

The invention discloses a calcium-containing copper-based composite oxygen carrier and a preparation method thereof. The oxygen carrier comprises the following components in percentage by mass: 95% of CuO and 5% of CaO. By adopting a sol-gel method, the calcium-containing copper-based composite oxygen carrier which is uniform in particle size and good in dispersity can be prepared by controlling proper reaction conditions; the preparation method of the calcium-containing copper-based composite oxygen carrier is simple, the prepared composite oxygen carrier has higher reaction rate, and the oxygen release rate can be obviously promoted.

The invention relates to the technical field of materials and fine chemical engineering, in particular to a nano composite material integrating heat conduction and wave absorption and a preparation method of the nano composite material. The microstructure of the nano composite material belongs to a sandwich-like structure, and boron nitride (BN) nanosheets prepared by a calcination method are uniformly intercalated between microwave absorbing filler (MoS2 or MXene) nanosheets. According to the prepared nano composite material integrating heat conduction and microwave absorption, the reaction condition in the preparation method is moderate, the process operation is simple, the difficulty in preparing the nano composite material integrating heat conduction and microwave absorption at present is solved, and a new method is provided. Therefore, the method has great scientific significance and practical application value.

The invention discloses an RT-LAMP (reverse transcription loop-mediated isothermal amplification) detection kit for maize yellow mosaic viruses. The kit comprises outer primers F3 and B3, inner primers FIP and BIP, RT-LAMP reaction solution and an RT-LAMP detection system formed by mixed solution of the RT-LAMP reaction solution and a specific RT-LAMP primer set. The kit can detect the maize yellow mosaic viruses simply and quickly, and overcomes the limitation of strong dependence of virus detection on instruments. The kit can be used for detecting the maize yellow mosaic viruses of maize andsorghum. In addition, the invention further discloses a detection method for detecting the maize yellow mosaic viruses by using the detection kit, the method can simply and quickly monitor whether amaize sample at a corn monitoring position is infected by the maize yellow mosaic viruses or not, and detection efficiency is improved.