32results about How to "Synthetic process green" patented technology

The invention relates to a synthetic method of p-methoxyacetophenone. Under normal temperature conditions, p-methoxyacetophenone with high yield and high purity was synthesized by Friedel-Crafts acylation reaction using anisole and acetic anhydride as raw materials, zinc chloride as catalyst and dichloromethane as solvent. The process has the advantages of simple synthesis process, low cost, mild reaction conditions, increased synthesis yield up to 90%, purity up to 99.5%, and maximal use of waste liquid to produce zinc oxide. No ecological environment risk, significant economic benefits, suitable for large-scale production.

The invention relates to an organic zinc vulcanizing activator and a preparation method thereof. The organic zinc vulcanizing activator is prepared through the following method: zinc hydroxide and benzoic acid are added into a reactor according to a molar ratio of (1.6 to 1.7) to 1, an alkane solvent with mass 1-50 times of that of the zinc hydroxide and a boiling point of 80-120 DEG C is added, reflux reaction is carried out for 30-120 min, after evaporation or cooling is conducted, suction filtration is conducted to recover the solvent, after drying is conducted, the white powdery organic zinc vulcanizing activator is obtained, and the zinc content of the organic zinc vulcanizing activator is 40-42%. The organic zinc vulcanizing activator can replace oxide zinc with an equal mass fraction, the content of zinc in a rubber product is greatly reduced, and the zinc is reduced by 50%, so that the organic zinc vulcanizing activator has the advantage of volume cost; the preparation method is simple, the reaction is mild and easy to control, the solvent can be recovered, no three waste is generated, and the preparation method of the organic zinc vulcanizing activator is a green synthesistechnology.

The invention provides a preparation method of diethyl malonate. Ethyl chloroacetate, alcohol and magnetic silica support metal complex and ammonium hydroxide are mixed to be uniform in a reaction vessel, carbon monoxide is used for replacing air in the reaction vessel for 3-6 times, the carbon monoxide is introduced, the pressure is maintained at 0.5-3 MPa, stirring is performed, a mixture inside the reaction vessel is heated to 30-70 DEG C to be subjected to a reaction for 1-6 h, diethyl malonate can be prepared, cooling and filtering are performed, and separation and rectification are performed to obtain the product diethyl malonate. The functional magnetic silica support metal complex material is adopted as the catalyst, reaction raw materials are simple, and operation is convenient; the catalyst is high in activity and small in consumption; the catalyst is good in stability and can be conveniently recycled; the preparation method is simple, the product yield is high, reaction conditions are mild, the preparation method of diethyl malonate is efficient and environmentally friendly, and large-scale industrial production is promoted.

The invention discloses a method for preparing a polyaniline material with a three-dimensional graded micro-nano structure, and belongs to the field of preparation of high polymer materials. The preparation method comprises the following steps: respectively dissolving an aniline monomer and an oxidizing agent in a strong acid solution, freezing the aniline monomer or oxidizing agent solution into ice, pouring the pre-cooled oxidizing agent or aniline monomer solution onto an ice layer, freezing the materials into ice, finally transferring the frozen ice blocks into a low-temperature environment to carry out polymerization reaction, and obtaining the three-dimensional hierarchical polyaniline materials with different morphologies. According to the method, soft and hard templates are not needed, an organic solvent is not needed, and the reaction time is shorter. The polymerization reaction is carried out in a strong acid environment, the conductive characteristic of polyaniline is ensured, and the hierarchical structure can be regulated and controlled by changing the adding sequence of reactants and the size of an ice layer or adopting a multi-layer freezing mode. The method is simple and controllable in preparation process, high in sample purity, unique in morphology and suitable for large-scale preparation, and has wide application potential in the fields of energy storage materials, adsorption materials, sensing materials, electromagnetic shielding materials, conductive functional materials and the like.

The invention relates to a method for synthesizing methyl heptenone from 2-methyl-3-buten-2-ol. 2-methyl-3-butene-2-alcohol takes Saucy-Marbet reaction with 2-alkoxylpropylene in the near critical state to obtain methyl heptenone. The synthesis method has the advantages that the use of catalysts is not needed; the selectivity of the product of methyl heptenone can be improved.

The invention discloses a synthetic process of an imidazo phenanthroline compound shown in a formula (III), which comprises the following steps: mixing phenanthroline diketone shown in a formula (I) with aldehyde and ammonium salt shown in a formula (II), and conducting condensation reaction after evenly grinding the mixture, thus obtaining the imidazo phenanthroline compound shown in the formula(III) after complete reaction. In the synthetic process, without the presence of catalyst acid, the synthesis of an imidazole ring is realized by grinding and reacting the phenanthroline diketone with the aldehyde and the ammonium salt under solvent-free conditions, so that the synthetic process has the characteristics of being green and efficient, and is suitable for industrial production.

The invention relates to a synthesis method of 3,4,5-trimethoxybenzoic acid. Under the condition of 110 to 120 DEG C, N, N-dimethylformamide is used as a solvent; under the catalysis condition of potassium carbonate, gallic acid and dimethyl carbonate are added in one step; the 3,4,5-trimethoxybenzoic acid is synthesized through methylation. The process has the advantages that the synthesis process is simple; the cost is low; the yield reaches 95 percent or higher; the product purity reaches 100.0 percent, and the like. The green methylation reagent of dimethyl carbonate is used for replacing highly toxic dimethyl sulfate; the high risk factor of the process is overcome; the process safety is improved to the maximum degree; the economic benefits are obvious; the method is suitable for large-scale industrial production.

The invention relates to an oligopeptide / silicon dioxide / hyaluronic acid composite hydrogel preparation method and belongs to the technical field of medical hydrogel materials. The oligopeptide / silicon dioxide / hyaluronic acid composite hydrogel has the characteristics of improving the strength of hydrogel dressings, having an anti-bacteria function, improving wound healing and being easy to combine with functional molecules. The preparation method comprises the steps of firstly self assembling amphipathic oligopeptide in water solution to form a stable self assembly; mixing silicon dioxide precursor with assembled oligopeptide solution to react in the appropriate condtion to obtain oligopeptide / silicon dioxide hydrogel; compositing the oligopeptide / silicon dioxide hydrogel with hyaluronic acid solution of the certain concentration to obtain the oligopeptide / silicon dioxide / hyaluronic acid composite hydrogel. The preparation method is used for preparing organic / inorganic composite hydrogel with higher mechanical strength, and the organic / inorganic composite hydrogel can be used as a three-dimensional support material of the medical dressings.

The invention discloses a process for synthesizing ethyl chloride. In a closed reactor, an ethyl chloride product can be obtained from ethanol and hydrogen chloride gas under the catalytic effect of AlCl3-ZnCl2 double component catalyst by gradually heating for reaction, releasing step by step and recovering. The high activity of AlCl3-ZnCl2 double component catalyst is used in the method, reaction temperature and by-product diethyl ether are reduced, and the yield of the ethyl chloride is increased to above 95%; by the use of the hydrogen chloride for replacement of industrial hydrochloric acid, mother liquor and distillate are directly continuously applied, energy consumption for distillation distillate recovery and hydrogen chloride loss are effectively reduced, environment pollution caused by production of a lot of high salt wastewater and organic waste acid can be avoided; in addition, by use of a closed staged heating reaction way, a catalytic substitution reaction is performed in a liquid phase system, substrate contact reaction time is increased, ethanol conversion rate reduction caused by too fast escaping of excessive hydrogen chloride from the reactor can be avoided, the consumption increase of the hydrogen chloride is avoided, and the atmospheric pollution is reduced.

A water-based polyurethane drug-loaded slow-release spray with opposite charges, its preparation method and application. It consists of anionic water-based polyurethane drug-loaded slow-release emulsion A with hydrophobic pesticide active ingredients and cationic water-based polyurethane drug-loaded slow-release emulsion B with hydrophobic pesticide active ingredients. The present invention utilizes the mutual attractive force between the anionic and cationic waterborne polyurethane particles, the hydrogen bonding effect and the reducing effect on the surface energy of the droplet to effectively improve the deposition rate of the sprayed droplet, and at the same time, effectively protect the active ingredients of the pesticide, Improve pesticide slow-release performance, rain erosion resistance, etc., and have simple components, good dispersion and storage stability, safe and non-toxic carrier, less environmental pollution, safe and efficient.

The invention relates to a vulcanizing activator and a preparation method thereof. The vulcanizing activator is prepared by the following steps: putting zinc oxide, benzoic acid and an alkane solventof which the boiling point is 100-150 DEG C into a reaction container in a mass ratio of 1:(0.05-0.1):(3-6), stirring for 30 minutes, adding glycerinum in a mole ratio to the zinc oxide of 1:(1.15-1.2), heating to 100-150 DEG C under stirring, enabling the components to react for 120-180 minutes, cooling, carrying out suction filtration, and drying a filter cake, thereby obtaining the vulcanizingactivator, wherein the content of zinc in the vulcanizing activator is 45-47%. The vulcanizing activator provided by the invention is capable of replacing zinc oxide in an equal mass fraction and hasa remarkable zinc reduction effect. The vulcanizing activator is simple in preparation method, convenient to operate and gentle in reaction condition.