15 results about "Potassium methoxide" patented technology

The invention discloses a nitrogen-doped carbon dot material with a high emulsification level and a preparation method thereof, and belongs to the technical field of two-dimensional interface materials. The method comprises the following steps: firstly, adding a NaOH aqueous solution into an acetaldehyde aqueous solution, then adding hydrochloric acid to adjust the pH value of the solution to be neutral, stirring for reaction, then centrifuging to retain precipitate, extracting with liquid nitrogen, and freeze-drying to obtain a carbon dot material; and adding the carbon dot material into a system of potassium methoxide and a nitrogen source, carrying out heating reaction, carrying out centrifugation, retaining the precipitate, drying, and preparing the nitrogen-doped carbon dot material with a high emulsification level by controlling the reaction time, regulating the acid amount and changing the nitrogen source. A large amount of nanoscale nitrogen-doped carbon dot material emulsifiers with an amphiphilic emulsification effect can be rapidly synthesized under mild reaction conditions, the obtained nitrogen-doped carbon dot material is uniform in size and high in dispersity, the emulsification requirements under different oil phase conditions can be met, the preparation process is simple, dialysis and centrifugation are not needed in industrial production, and the method is suitable for industrial production. And the nitrogen-doped carbon dot material with a high emulsification level can be prepared only through centrifugation and drying.

The present invention relates to the technical field of polyurethane coatings, and in particular to a polyurethane coating with sufficient tack-free dryness and a preparation method therefor. In the present invention, ethylene glycol, potassium methoxide, and glycidol are used to prepare a branched polyglycidyl ether and silicon dioxide is modified using the branched polyglycidyl ether. The addition of the branched polyglycidyl ether improves the compatibility of the modified silicon dioxide in a modified polyurethane emulsion, thereby enhancing the hydrophobicity and corrosion resistance of the coating. The backbone of the branched polyglycidyl ether has a high molecular weight, providing a large number of crosslinking sites, and by adding the branched polyglycidyl ether-modified silicon dioxide to the polyurethane coating, the water resistance of the polyurethane coating is enhanced. In the present invention, benzotriazole is also loaded on the silicon dioxide as a corrosion inhibitor, thereby imparting a corrosion-resistant effect to the coating.

The invention relates to the technical field of fiber acid dyeing, and particularly discloses a sheep villus fiber acid dyeing fixation method which comprises the following steps: mixing acetic acid, triethanolamine and cardanol polyoxyethylene (n) ether sulfate to obtain a prefabricated material a; caprolactam is mixed with rhamnolipid, polyvinylpyrrolidone and acylation modified chitosan, and a prefabricated material b is obtained; mesoporous silica, saturated ammonia water, tetraethoxysilane, potassium methoxide, dioxane and succinic anhydride are adopted to prepare a prefabricated material c; adding the prefabricated material a into the prefabricated material b, stirring, then adding the prefabricated material c, uniformly mixing, adjusting the pH value of the system to 5-6, adding cashmere fibers, keeping the temperature at 5-10 DEG C for 10-20 minutes, heating to 40-50 DEG C, keeping the temperature for 10-20 minutes, adding an acid dye and anhydrous sodium sulfate, uniformly stirring, keeping the temperature for 1-2 hours, heating to 80-90 DEG C, keeping the temperature for 30-50 minutes, taking out, washing, and airing at room temperature.

The application discloses a kind of eluent and its preparation method and application, preparation method includes: adding potassium methoxide methanol solution to the trimethylolpropane in molten state, after stirring, vacuumizing, then droping glycidol monomer, after reaction, add methanol, dry, obtain hyperbranched polyglycerol ether;Add carbonyl imidazole to the N,N-dimethylformamide solution of saturated fatty acid, after stirring and mixing, drop to the N,N-dimethylformamide solution of hyperbranched polyglycerol ether, reaction is heated in nitrogen atmosphere, after reaction, the product is treated, obtain temperature-sensitive hyperbranched polyglycidol ether eluent.The eluent prepared in the application can greatly reduce the treatment cost of elution waste liquid while efficiently removing heavy metals.

The invention discloses a supported bimetallic complex catalyst for synthesizing isovanillin and a preparation method and application thereof.The catalyst is composed of an inorganic porous carrier and an active component supported on the inorganic porous carrier, and the active component is a bimetallic complex formed by Cu, Co and 1, 10-phenanthroline; the inorganic porous carrier is an SBA-15 molecular sieve or amino-modified Fe3O4 (at) SiO2 magnetic nanoparticles with a core-shell structure. The catalyst is prepared from a metal salt, a ligand and a carrier in a solvent through a coordination-loading one-step method. The catalyst disclosed by the invention is applied to one-step synthesis reaction of isovanillin by taking heliotropin and sodium methoxide or potassium methoxide as raw materials, and shows extremely high catalytic activity and product selectivity (yield gt; and by virtue of the load-type characteristic, especially the application of the magnetic carrier, rapid magnetic separation and recovery and repeated recycling can be realized, so that the catalyst is obviously superior to a traditional homogeneous copper chloride catalytic system, and has the potential of simple steps, environment friendliness and suitability for industrial production.

This invention belongs to the fields of chemical engineering and energy conservation, and discloses an energy-saving device and method for producing potassium methoxide using a thermally coupled alkaline process. The energy-saving device for producing potassium methoxide using a thermally coupled alkaline process includes: a reaction system, a distillation system, and a recovery system; the reaction system includes a reaction tower; the distillation system includes a distillation tower, a dehydrator, a first compressor, a second compressor, a falling film reboiler, and a distillation condenser; the recovery system includes a primary feed preheater, a secondary feed preheater, a first recovery tower condenser, a first recovery tower, a first recovery tower falling film reboiler, a second recovery tower, a second recovery tower falling film reboiler, a third recovery tower, and a third recovery tower reboiler. This invention discloses a method for producing potassium methoxide using an alkaline process based on the aforementioned energy-saving device for producing potassium methoxide using a thermally coupled alkaline process. This invention utilizes the heat from the product in the reaction tower bottom and the heat from the recovery system to thermally couple with the feed stream, saving energy consumption of steam in the reaction tower bottom and the amount of circulating water used.

The invention discloses a synthesis method of sorbitol polyether, and belongs to the technical field of organic matter synthesis. The synthesis method comprises the following steps: carrying out polymerization reaction on solid sorbitol serving as an initiator and epoxide under the action of a catalyst, and degassing and neutralizing after the reaction is finished, so as to obtain sorbitol polyether; wherein the catalyst is a Schroisine solution containing a modifier; the modifier is at least one of potassium hydroxide, sodium hydroxide, potassium methoxide and sodium methoxide. According to the invention, the modified Schnoisine is used as a catalyst, so that the polymerization reaction of the solid sorbitol and the epoxy compound can be efficiently catalyzed, the reaction induction period can be remarkably shortened, the polymerization rate can be effectively accelerated, and the high functionality of the product is maintained while the production cycle is greatly shortened; according to the preparation method, the problems of reduced functionality and process complexity caused by addition of a low-functionality regulator or solvent in the prior art are effectively avoided, the process is simple, the operation is simple and convenient, and the prepared sorbitol polyether has high functionality and is suitable for various downstream applications.

The invention discloses an organic lithium ion low-temperature battery positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that a quinone compound containing hydroxyl and a potassium methoxide solution are subjected to a salinization reaction for 5-8 h in an ice-water bath at the temperature of 0-10 DEG C, and the molar ratio of the hydroxyl in the quinone compound to the potassium methoxide is (1-1.2): 1; the preparation method comprises the following steps: preparing a mixture through distillation, freezing, drying, ball milling and screening, dispersing and mixing the mixture, an additive and an adhesive to obtain slurry, and taking the slurry as the positive electrode material of the organic lithium ion low-temperature battery, and has the advantages that the raw materials of the positive electrode material of the organic lithium ion low-temperature battery are cheap and easy to obtain, the synthesis method is simple to operate, and the yield is high; when the material is used for a lithium ion battery system at a low temperature, extremely good charge-discharge capacity, excellent cycling stability and comprehensive electrochemical performance can be realized, and the material has a relatively good application prospect.

The application belongs to the technical field of organic base compound preparation, and particularly relates to a production and preparation method of high-purity potassium methoxide. The application breaks through the reaction balance limitation of the traditional potassium hydroxide-methanol system by coupling three factors of segmented temperature control reaction, in-situ glycerol dehydration and composite modified diatomite adsorption, and realizes efficient preparation of high-purity potassium methoxide under the conditions of mildness, low toxicity and low cost. The segmented temperature control can remove free water of raw materials in the low-temperature section, accelerate the main reaction rate and continuously inhibit the reverse reaction of hydrolysis in the high-temperature section. The glycerol forms a stable hydrogen bond network by virtue of the multi-hydroxyl structure, in-situ reduces the water activity of the system, and promotes the reaction according to the Le Chatelier principle to fully convert the potassium hydroxide. The adsorbent can simultaneously realize the triple functions of free alkali capture, heavy metal complexation, and colloid and colored impurity removal. The obtained potassium methoxide has a purity of greater than or equal to 99.6%, low water content and heavy metal content, low colority, no organic by-products, high safety, and excellent comprehensive performance.

The invention discloses a plant polyphenol-based fixing agent and a preparation method and application thereof, and relates to the technical field of drilling solid waste treatment.The plant polyphenol-based fixing agent is obtained by uniformly mixing plant polyphenol with a catalyst and then adding phenyl-containing diglycidyl ether for a reaction, the plant polyphenol contains one or more benzene ring structures and has phenolic hydroxyl functional groups; the catalyst is one or more of sodium methoxide, potassium methoxide, sodium ethoxide and potassium ethoxide, and the addition amount of the catalyst is 1-5wt% of the total mass of the plant polyphenol and the phenyl-containing diglycidyl ether; the mass ratio of the plant polyphenol to the phenyl-containing diglycidyl ether is (2-10): 1. The technical problems that in the prior art, drilling solid waste treatment is high in cost, long in period, short in fixing time, high in leachate pollutant content and the like are solved.

The present invention discloses a composite material of a few-layer two-dimensional transition metal sulfide and graphene ribbons, as well as its preparation method and application. The method places a two-dimensional transition metal sulfide (MoS2), metallic potassium, and a certain proportion of carbon nanotubes into a vacuum reaction vessel, and heats the reaction vessel for different times and temperatures, causing the metallic potassium to vaporize and enter the MoS2 layer while also entering the interior of the carbon nanotubes. After a certain reaction time, when the distribution of the embedded potassium atoms stabilizes, the reaction vessel is cooled and removed, and methanol is added to react the metallic potassium with the methanol to form potassium methoxide. The potassium methoxide is removed by washing, and the carbon nanotubes are simultaneously stripped to prepare the composite material of the few-layer two-dimensional transition metal sulfide and graphene ribbons. When the composite material of the few-layer two-dimensional transition metal sulfide and graphene ribbons of the present invention is used as a negative electrode material, the battery has excellent rate performance.

A nitrogen-doped carbon dot material with a high emulsification level and its preparation method belong to the technical field of two-dimensional interface materials. First, a NaOH aqueous solution is added to an acetaldehyde aqueous solution, followed by adding hydrochloric acid to adjust the solution pH to neutral. After stirring for reaction, the solution is centrifuged to retain the precipitate, extracted with liquid nitrogen, and freeze-dried to obtain a carbon dot material. The carbon dot material is then added to a system of potassium methoxide and a nitrogen source, heated for reaction, centrifuged to retain the precipitate, and dried. The nitrogen-doped carbon dot material with a high emulsification level is prepared by controlling the reaction time, adjusting the acid amount, and varying the nitrogen source. The present invention can rapidly synthesize a large amount of nanoscale nitrogen-doped carbon dot material emulsifier with an amphiphilic emulsifying effect under mild reaction conditions. The resulting nitrogen-doped carbon dot material is uniform in size and highly dispersed, capable of meeting emulsification requirements under different oil phase conditions. The production process is simple, and in industrial production, dialysis and centrifugation are not required; only centrifugation and drying are required to prepare the nitrogen-doped carbon dot material with a high emulsification level.

The invention discloses a preparation method of (2-methoxy) ethyl methyl carbonate, which comprises the following steps: 1, dissolving ethylene carbonate and methanol in dimethyl carbonate, adding a base catalyst which is selected from one of potassium tert-butoxide, a 25wt% potassium methoxide methanol solution and potassium hydroxide, and heating and stirring; and 2, pickling and quenching until the pH is acidic, washing, drying and carrying out rotary evaporation to obtain a crude product, and rectifying to obtain a pure product. The method has the advantages of simple preparation process route, mild reaction, easiness in control, low purification difficulty, few byproducts, high yield and high purity.

The invention belongs to the technical field of polyester recovery, and relates to a PET / PTT blended fabric depolymerization recovery method, a basic catalyst and dimethyl carbonate are adopted, and the basic catalyst is composed of a strong basic catalyst and a weak basic catalyst in a mass ratio of 2: 8-8: 2; the strong alkaline catalyst is one or more of sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, sodium methoxide, potassium methoxide, sodium ethoxide and potassium ethoxide, and the weak alkaline catalyst is one or more of potassium bicarbonate, sodium bicarbonate and sodium dihydrogen phosphate; the depolymerization recovery method disclosed by the invention is good in separation effect, the separation difficulty and the product loss are reduced, and the product purity is high.

The invention belongs to the field of chemical engineering and energy conservation, and discloses an energy-saving device and method for producing potassium methoxide by a thermal coupling alkaline method. An energy-saving device for producing potassium methoxide by a thermal coupling alkaline method comprises a reaction system, a rectification system and a recovery system, the reaction system comprises a reaction tower; the rectification system comprises a rectification tower, a dehydrator, a first compressor, a second compressor, a rectification falling film reboiler and a rectification condenser; the recovery system comprises a raw material primary preheater, a raw material secondary preheater, a first recovery tower condenser, a first recovery tower, a first recovery tower falling film reboiler, a second recovery tower, a second recovery tower falling film reboiler, a third recovery tower and a third recovery tower reboiler. The invention discloses a method for producing potassium methoxide by an alkaline process based on the thermal coupling alkaline process potassium methoxide production energy-saving device. The reaction tower kettle product and the heat of the recovery system are thermally coupled with the feeding material flow, so that the steam energy consumption and the circulating water consumption of the reaction tower kettle are reduced.