253results about How to "Lower reaction conditions" patented technology

The invention discloses a Gemini quaternary ammonium salt cationic surfactant with sterilization effect. The preparation method of the Gemini quaternary ammonium salt cationic surfactant disclosed by the invention relates to that a dihalide and a fatty amine are reacted in an organic solvent, i.e. a dibromo-matter and an alkyl tertiary amine perform chemical reaction in an ethanol (or acetone or ethyl acetate) solution at the room temperature or at a low temperature and normal pressure condition, so as to synthesize a series of Gemini quaternary ammonium salt cationic surfactants. The method for synthesizing the Gemini quaternary ammonium salt cationic surfactant is simple and convenient, stable in reaction process, easy for operating and controlling with a higher product purity and yield; besides, compared with the novel geramine, the method has better sterilization effect and has important application in the aspect of oil field germicide at the same time.

The invention relates to a method for extracting aluminum oxide. The method comprises the following steps: heating and decomposing ammonium sulfate to generate ammonium hydrogen sulfate or ammonia gas, preparing an ammonium hydrogen sulfate solution, and collecting the ammonia gas for preparing ammonia water; grinding coal ash, mixing the coal ash with the ammonium hydrogen sulfate solution according to a certain ratio, heating while stirring, and reacting to generate ammonium aluminum sulfate; re-crystallizing and purifying ammonium aluminum sulfate to prepare an ammonium aluminum sulfate solution, and reacting with the ammonia water to generate aluminum hydroxide; drying aluminum hydroxide and roasting to generate aluminum oxide. According to the method, aluminum oxide can be extracted from not only the coal ash but also aluminum-containing raw materials such as coal gangue, slag, bauxite, red mud, tailings, kaolin and mullite; the technological process is shorter, equipment is simple, and large-scale industrialization production is easy to realize.

The invention provides a preparation method of active carbon. The preparation method comprises the following processes: a pre-oxidation process: performing pre-oxidation reaction on coal direct liquefaction asphalt to obtain pre-oxidized asphalt; a carbonization process: mixing the pre-oxidized asphalt with an activating agent, and performing carbonization reaction to obtain carbonized asphalt; and an activation process: performing heating activation on the carbonized asphalt to obtain active carbon. The coal direct liquefaction asphalt is subjected to pre-oxidation at first to ensure that small-molecular substances and macromolecular substances in the asphalt can be crosslinked with each other to form high-melting-point pre-oxidized asphalt, so that the coal direct liquefaction asphalt can be beneficially inhibited from melting in the carbonization process; and then, the pre-oxidized asphalt is subjected to the processes of carbonization and quick activation to prepare the active carbon with a relatively high specific surface area. The preparation method of the active carbon, provided by the invention, is more moderate in reaction condition and simpler in process flow.

The present invention provides a tildipirosin preparation method, tylosin as a starting reactant is used for preparation of 23-hydroxyl-5-O-mycaminose-tylosin lactone, 14-aldehyde-5-O-mycaminose-tylosin lactone is further prepared, and finally tildipirosin(IV) is prepared; by determining of reasonable oxidizing conditions, the use of expensive iodine can be avoided, the reaction conditions can be reduced; by controlling of the reaction conditions, two times of hydrolysis reaction can be performed in one pot, the operation steps can be reduced, the technical purpose of overall cost reduction can be achieved, and the method is less in step, simple in process, low in cost, and suitable for large-scale industrial production need.

The invention discloses a method for preparing large-area single-layer WSe2 monocrystals and mainly solves the problems of complicated process and poor controllability of a traditional preparation method. The method comprises implementing steps as follows: 1, substrates are selected and subjected to RCA standard cleaning, and two substrates are selected, subjected to ultrasonic cleaning with deionized water, acetone and isopropyl alcohol in sequence for 5 min and air-blown; 2, the cleaned substrates are put in a tubular furnace, two quartz boats are prepared and taken as a W boat and an Se boat respectively, and an NaCl solution is dropwise added to the front end of the first substrate and then heated on a hot plate until deionized water is completely vaporized; WO3 is arranged on the first substrate, the first substrate is covered with the second substrate, then the W boat is placed in a high-temperature area, Se is arranged in the Se boat, and the Se boat is placed in a low-temperature area; 3, a cavity is purged, the high-temperature area and the low-temperature area of the tubular furnace are subjected to temperature control respectively, WO3 and Se are subjected to a reaction,WSe2 is produced, and a product is sealed. The method is lower in cost, high in controllability and suitable for preparing the repeatable large-area single-layer WSe2 material.

The invention discloses a method for preparing nano metallic nickel in spent electroless nickel plating solution. The method comprises the following steps: adding 0.20 to 0.33 grams of reducer thiourea dioxide into every 100ml of the spent electroless nickel plating solution; then, adjusting the spent electroless nickel plating solution to be alkalic with 3 to 7 grams of sodium hydroxide, and heating the spent electroless nickel plating solution to the temperature of between 70 and 100 DEG C; reacting at constant temperature for 5 to 20 minutes, and cooling the solution to the temperature of between 10 and 30 DEG C; filtering the spent electroless nickel plating solution; and washing the filtered substances with deionized water and absolute ethanol respectively; and drying the substances in a vacuum drier to prepare the nano metallic nickel. The method effectively solves the problem of spent electroless nickel plating solution pollution, simultaneously recycles noble metal nickel, and realizes double assurance of social benefit and economic benefit for enterprises. Furthermore, the reducer thiourea dioxide has lower requirement to the reaction condition, less investment, no toxic or side effect and environmental protection.

A provided preparation method for wool keratin regenerated cellulose fiber comprises the concrete steps: firstly preparing a viscose-rayon spinning solution, then preparing a wool keratin solution, then mixing the viscose-rayon spinning solution and the wool keratin solution, then adding a crosslinking agent, mixing and performing wet-process spinning, so as to obtain wool keratin regenerated cellulose fiber. The wool keratin regenerated cellulose fiber prepared by employing the method has the protein content of 6% or more, and the production technology is simple in process and high in production efficiency.

The invention discloses a preparation process for ammonium paratungstate. The preparation process comprises preparation of sodium tungstate, preparation of sodium tungstate ammonium, decomposition, washing and impurity-removal, and purifying and re-crystallization. The process adopts an electro-catalysis way to prepare an intermediate product sodium tungstate, so that the reaction conditions are reduced, reaction is easier, and production energy consumption is reduced; and ammonium paratungstate is subjected to impurity-removal and purification through a cleaning, re-crystallizing and purifying way, so that purity of ammonium paratungstate prepared in the process is relatively high.

The invention discloses a method for modifying fast-crystallization high-crystallinity polylactic acid, and provides fast-crystallization high-crystallinity polylactic acid prepared by taking a phenyl phosphate nucleating agent and polylactic acid as main raw materials. The method comprises the following steps of firstly preparing a high-crystallinity nucleating agent by utilizing raw materials, namely phosphenylic acid, chloride, alkali and the like; then adding experimental raw materials, namely the nucleating agent, the polylactic acid and the like, to an HAAKE torque rheometer according to a polymer crystallizing principle for blending so as to prepare a sample. According to the method, the obtained modified polylactic acid is reduced in crystallization temperature to 109 DEG C and enhanced in crystallinity by about 107% in a crystallization process, and the half-crystallization time of the modified polylactic acid is reduced by about 15 times compared with the half-crystallization time of pure polylactic acid.

This invention discloses a method of catalysis wet process oxygenizing and degrading sodium metanitrobenzene sulphonate, which relates to industry nickel decoating waste water. It belongs to catalytic oxidation technique domain. Add sodium metanitrobenzene sulphonate solution which has certain TOC density in reactor, of which volume is 11. Add hydrogen dioxide and oxygen as oxidizing agent, add cupric nitrate as catalytic agent, seal up; import oxygen of which incipient pressure is 0.1-15MPa, mix, heat to 150-300deg, degrade, react 0.5h-2.5h, cool, process to finish, measure total organic carbon. After 30 minutes, removal rate of total organic carbon is 95.94%; After 2 hours, removal rate of total organic carbon is 96.51 %.

The invention discloses butynediol ethoxylate modified bola type organosiloxane and a preparation method thereof. The preparation method includes: butynediol ethoxylate and tetramethyl dihydro disiloxane have reaction under the effects of a platinum catalyst and an amine composite catalyst to obtain butynediol ethoxylate modified tetramethyl disiloxane; balanced copolymerization is performed under the effect of a catalyst to obtain the butynediol ethoxylate modified bola type organosiloxane. The preparation method has the advantages that the method is large in grafted hydrophilic group proportion, high in grafting rate, free of solvent adding and suitable for large-scale industrial production; the prepared hydrophilic group butynediol ethoxylate modified bola type organosiloxane is good in water solubility, good in wetting and spreading ability, high in surface activity and high in defoaming/foam inhibiting performance.

The invention discloses a method for preparing a natural high-molecular material by the utilization of rare earth metal ion coordination. Through strong coordination between rare earth metal ion and oxygen atom in carboxyl function group, the rare earth metal ion coordinated natural high-molecular material is prepared by an ion permeation and diffusion method. According to the method, carboxyl-modified graphene oxide is introduced into the natural high-molecular material such that mechanical strength of the material is enhanced and structural regularity of the material also can be boosted. By selecting one ingredient from sodium alginate and xanthan gum as the base material, the material can be endowed with good biocompatibility and biodegradability. The method of the invention is simple and feasible. Reaction condition is mild. The prepared natural high-molecular material has good biocompatibility and strong mechanical properties.

The invention relates to a method for preparing water-white highly-hydrogenated rosin. The method comprises the following step that rosin serving as a raw material is subjected to catalytic hydrogenation in the presence of a loading type nano palladium-based catalyst to obtain the water-white highly-hydrogenated rosin. In the method, the nano loading type palladium-based catalyst is utilized for the hydrogenation of the rosin, the reaction temperature is between 100 and 180 DEG C, the reaction pressure is 1.0 to 10.0MPa, and the reaction time is 2.0 to 5.0 hours; and the catalyst is removed by filtration, the solvents are removed by decompressed distillation, and the water-white highly-hydrogenated rosin is obtained. The method has the advantages of low reaction conditions, easy process operation, less consumption and long service life of catalyst, low production cost, good product quality, flexible operation, low equipment cost and the suitability for industrialized production.