12 results about "Aqueous alcohol" patented technology

The invention relates to the technical field of preparation of metal powder materials, and discloses a preparation method of surface-coated scaly zinc powder and the zinc powder.The preparation method comprises the five steps of zinc powder pretreatment, coating liquid preparation, surface coating, drying and curing and screening treatment.The high-purity zinc powder is subjected to ball milling to be of a scaly structure; the method comprises the following steps: adding zinc particles into a coating solution, then adding a coating solution formed by fully mixing a silane coupling agent, an organosilicon compound, an antioxidant, a performance enhancer and a water-containing alcohol ether solvent, filtering and separating zinc powder and the coating solution after a compact coating layer is formed on the surfaces of the zinc particles, drying and curing, and finally screening the cured and cooled zinc powder. The method has the effect of improving the oxidation resistance of the zinc powder.

The present invention provides a method for preparing silica based on the gas-liquid two-phase interface method, comprising the steps of: S1, providing an aqueous alcohol solution; S2, mixing an additive into the aqueous alcohol solution to obtain a reaction solution; the additive includes an alkali material; S3, loading silicon tetrachloride gas in the inert gas, and then controlling the inert gas to continuously aerate into the reaction solution; S4, stopping aerating into the reaction solution to obtain a termination solution; S5, aging the termination solution to obtain an aged solution; S6, separating the solid and liquid of the aged solution to obtain a primary silica product. The present invention prepares silica through the gas-liquid two-phase interface reaction of silicon tetrachloride, and overcomes problems such as fast hydrolysis rate and high danger of silicon tetrachloride by using the gas-liquid interface principle, and prepares silica with high dispersibility, spheroidization degree and purity, controllable morphology and uniform particle size distribution.

Disclosed is an aqueous alcohol-free dentifrice gel having pH 6 to 8.5 comprising: a) 4 to 50 wt% abrasive silica; b) 0.1 to 2.5 wt% of a sparingly water-soluble compound of zinc whose solubility at 20°C is 0.001 to 4 g / 100 g water, and, c) 0.05 to 0.5 wt% sodium hydroxide or potassium hydroxide, wherein the composition comprises 0.6 to 1.5 moles of hydroxide ions per mole of zinc ions in said sparingly water-soluble compound of zinc.

Processes for preparation of a high purity cyproconazole, i.e., (2RS,3RS;2RS,3SR)-2-(4-chlorophenyl)-3-cyclopropyl-1-(1H-1,2,4-triazol-1-yl) butan-2-ol; and its compound i.e., 2-(4-chlorophenyl)-2-(1-cyclopropylethyl) oxirane generally includes reacting a ketone of formula (II) with a sulfonium salt in the presence of a base to obtain the oxirane compound of formula (III);wherein the sulfonium salt is obtained by reacting dimethyl sulfide and dimethyl sulfate in the presence of water; followed by reacting the oxirane compound of formula (III) with 1,2,4-triazole or its alkali metal salt to obtain a crude cyproconazole; and treating the crude cyproconazole with an aqueous alcohol to obtain a higher purity cyproconazole.

The invention discloses a shell side surface repairing process, which belongs to the technical field of electronic product shell repairing, and comprises the following steps: S1, cleaning the damaged part of the shell side surface to remove dust and oil stain on the surface; s2, a brush is used for evenly smearing the repairing agent to the damaged part of the side face of the shell, and it is ensured that the damaged part is completely covered; s3, preliminarily curing the repairing agent; s4, a wool wheel is used for slightly polishing the repaired position, so that the repaired surface and the side face of the shell are integrally kept flat; s5, a sponge wheel is matched with a water-containing alcohol solution to grind the repaired surface, and the redundant repairing agent is removed; and S6, the repaired shell is subjected to standing for 24 hours in a ventilated place, so that the repairing agent is completely cured. According to the shell side face repairing technology, the damaged shell side face is treated, the defects of the shell side face can be effectively overcome, attractiveness is good, durability is high, the shell side face repairing technology is stable in performance in the high-temperature environment, the humid environment and the like, and the service life of the shell can be effectively prolonged.

The invention relates to the technical field of clathrates, in particular to a coenzyme Q10-cyclodextrin clathrate and a preparation method and application thereof.The preparation method comprises the steps that coenzyme Q10 is dissolved in an aqueous solution of alcohol, and a first solution is obtained; performing ultrasonic treatment on the first solution at 40-45 DEG C to obtain a second solution; cooling the second solution to obtain a third solution, adding a cyclodextrin derivative solution into the third solution, and mixing to obtain a cyclodextrin inclusion compound fourth solution of the coenzyme Q10; and adding corn starch into the fourth solution, stirring for reaction, and removing the solvent to obtain the coenzyme Q10 cyclodextrin derivative corn starch inclusion compound. The preparation method provided by the invention has the advantages of simple operation and high encapsulation efficiency, and the coenzyme Q10-cyclodextrin derivative corn starch inclusion compound has good long-term storage stability.

A new process and apparatus for preparing aqueous ethanol for dehydrating ethylene includes distilling aqueous ethanol from water to provide a vapor ethanol stream and charging the ethanol in the vapor phase to an ethanol dehydration reactor to produce ethylene. The process and apparatus reduce heating requirements and eliminate the need for removal of metals and heavy oxygenates present in the fermented aqueous ethanol stream.

The present invention relates to a process for producing alcohols comprising:a. an IBE-type fermentation step in at least one bioreactor (R1) in the presence of a natural strain microorganism, and fed at least with an aqueous solution (1) of C5 and / or C6 sugars and a recycled acetone stream (3), in order to produce fermentation gases and a fermentation broth containing fermentation products;b. a step of recovering the fermentation products, in order to obtain a stream of fermentation products (2);c. a step of treating the stream of fermentation products comprising an acetone separation section in order to produce at least an acetone effluent (3) and an aqueous alcohol effluent (4);d. a step for recycling at least a fraction of the acetone effluent (3) from step c) to step a).

The present invention provides a process for preparation of highly purified mogrosides mixture from low purity mogrosides mixture. The process comprises providing a mixture of low purity mogrosides, dissolving the low purity mogrosides mixture in water or an aqueous alcohol solution to form an initial solution of mogrosides, passing the initial solution through a column system, wherein the column system comprises a plurality of columns, and each column is packed with a sorbent having different affinities to impurities and mogrosides so that one or more columns retains more mogrosides than other columns, washing the columns to remove impurities with an acidic aqueous solution, a basic aqueous solution, and an aqueous alcoholic solution successively, eluting the columns with an aqueous alcohol solution that contains higher alcohol content than the aqueous alcohol solution used in the washing step, wherein the eluate from the columns with high content of mogrosides are combined, and drying the combined eluate to obtain high purity mogrosides with the content of the total mogrosides are more than 70% (w / w). The present invention also provides a sweetener mixture and product comprising high purity mogrosides.

FIELD: biotechnology.SUBSTANCE: used in diagnostic and research laboratories. A method for producing rod-shaped magnetite particles for isolating deoxyribonucleic acid (DNA) from whole blood is proposed, which includes producing Fe3O4 magnetite rods. At the first stage, particles of akagenite β-FeOOH are formed by hydrolysis of 0.57 M aqueous solution of FeCl3 at a temperature of 120–125 °C for 3 h. After completion of the reaction, the suspension is cooled to room temperature, the precipitate is separated by centrifugation at 10000 g for 10 min, washed with deionized water and ethanol and dried at 60 °C throughout the day. The resulting akagenite particles are dispersed in 20 ml of ethylene glycol using ultrasonic treatment at 100 W for 15 minutes. The resulting suspension is placed in an autoclave and subjected to hydrothermal treatment at 200 °C for 8 hours with the formation of the magnetite phase Fe3O4. Magnetite particles are separated with a magnet, washed successively with water and ethanol and dried at 60 °C within 24 hours. Then, a SiO2 shell is formed by dispersing a 50 mg sample of dried magnetite rods in 5 ml of deionized water. Dispersion is carried out in five cycles, each of which includes stirring at 300 rpm for 10 min and ultrasonic treatment at 45 W for 3 min. Isopropanol is added to the resulting suspension at a rate of 15 ml of isopropanol for every 5 ml of water, after which the mixture is stirred for 20 min at 300 rpm. Then, while stirring, 0.5 ml of a 25% NH4OH solution and 0.5 ml of tetraethoxysilane are added to the aqueous alcohol dispersion of particles for every 50 mg of rods. The formation of the SiO2 shell is carried out at room temperature for 20 hours with constant stirring. After incubation, the particles are purified by magnetic decantation with deionized water at least five times. The process of forming a silicon dioxide shell is repeated twice, and the purified rod-shaped particles of Fe3O4@SiO2 are dispersed in a 5% solution of polyethylene glycol with a molecular weight of 4000 Da. Fe3O4@SiO2-NH2 particles can also be obtained.EFFECT: increasinng the quantity and improving the purity of DNA isolated from whole blood by using magnetic particles with increased specific surface area and sorption capacity.2 cl, 12 dwg, 2 tbl, 3 ex

A process comprising: (a) providing an aqueous alcohol mixture containing water, at least 35% by weight of alcohol, and a pectin-containing biomass feedstock comprising an insoluble fiber component and an insoluble protopectin component; (b) contacting an acid with the aqueous alcohol mixture at a temperature of at least 40°C and a pH in the range of 0.5 to 2.5 to form an activated mixture comprising a liquid component and an activated pectin-containing biomass composition comprising the insoluble fiber component and a water-soluble pectin component; (c) removing at least a proportion of the liquid component from the activated mixture to form a solid fraction comprising the activated pectin-containing biomass composition;and (d) bringing the solid fraction into contact with water to form an aqueous mixture and adjusting the pH of the aqueous mixture to within a range of 3.5 to 6, thereby forming a liquid fraction containing the water-soluble pectin component; applying mechanical energy to the aqueous alcohol mixture of step (a) or to the activated mixture of step (b) or both.

The invention relates to the technical field of preparation of catalytic materials and porous metal oxides, and discloses a preparation method and application of dissimilar metal doped mesoporous cobaltosic oxide, and the preparation method comprises the following steps: adding an alkaline reagent and a template agent into a water-alcohol solution, and stirring until the materials are uniformly mixed to obtain a clear and transparent mixed solution; adding a tannic acid solution and a formaldehyde solution into the mixed solution, and stirring to enable tannic acid and formaldehyde to be subjected to prepolymerization reaction to obtain a prepolymerized solution; metal salt is added into the pre-polymerized solution, and a precursor solution is obtained.According to the preparation method, a resin structure formed by tannic acid and formaldehyde is introduced in the synthesis process, the integrity of a mesoporous structure can be effectively maintained in the subsequent volatilization treatment and calcination process, and the obtained material has a stable mesoporous frame and a high specific surface area; and diffusion and mass transfer of reactants are facilitated.