32 results about "Acetaldoxime" patented technology

The invention discloses a reduction method for graphene oxide. The method comprises the following steps: using acetone oxime, acetaldoxime or methyl ethyl ketoxime as a reducing agent, and then preparing the graphene by reducing the graphene oxide in a graphene oxide aqueous solution the pH value of which is 6-10, wherein the reaction temperature is 80-100 DEG C and the mass ratio of graphene oxide to the reducing agent acetone oxime, acetaldoxime or methyl ethyl ketoxime is 1: (0.2-5). The method is characterized in that the oximido having lower toxicity is used as the reducing agent and thegraphene is acquired by reducing the graphene oxide by using a chemical reduction method. The preparation method is simply and easily performed, the reaction process is easily controlled, no special requirement for equipment exists, the cost is low, the pollution is free, and the method is easily popularized and used.

The invention provides a method for preparing acetaldehyde oxime. The acetaldehyde oxime is prepared by carrying out reaction on acetaldehyde and ketoxime in the presence of an acid which serves as a catalyst to exchange oxime. The method provided by the invention is simple, has the advantages of mild reaction conditions, high acetaldehyde conversion rate and environment-friendly reaction process, is a typical chemical process and is suitable for industrial implementation.

The invention relates to a method for preparing anhydrous acetaldoxime, which comprises the following steps: adding a hydroxylamine solution, aldehyde and alkali into an oximation reactor with a stirring or external circulating system to perform reactions so as to prepare aldehyde oximation solution; passing the aldehyde oximation solution through a cooler and then sending the same into a liquid-liquid separator; sending the upper layer oil phase into a rectifying tower A to perform rectification so as to obtain an acetaldoxime aqueous solution of which the mass percent is about 50 percent and anhydrous acetaldoxime; and sending the solution on the lower layer and containing an inorganic salt into a rectifying tower B to perform rectification so as to obtain the acetaldoxime aqueous solution of which the mass percent is about 50 percent from the tower top, wherein the product at the bottom of the tower is acetaldoxime-free inorganic salt aqueous solution. The method makes full use of the functions that the solubility of the acetaldoxime is reduced at a low temperature and the inorganic salt is salted out, avoids the defects that the conventional extraction method and the vapor phase extraction method consume a large amount of organic solvent, are not environment-friendly and have complex and difficultly-controlled devices in the preparation of the anhydrous acetaldoxime, effectively improves the production condition, is an environment-friendly novel process, and has excellent economic and social benefits.

The invention provides a mercaptoacetone oxime cleaner production method and system. The method at least comprises the following steps that (1) aldoxime and a solution containing chloride ions are added into an anode chamber of an electrolytic cell, an electrolyte solution is added into a cathode chamber, energization is conducted for electrolysis, and a solution containing chloroacetaldehyde oxime is formed in the anode chamber; and (2) the solution containing the chloroacetaldehyde oxime is mixed and reacted with methyl mercaptan, a solution containing mercaptoacetone oxime is obtained, separated and purified, and a finished mercaptoacetone oxime product is obtained. Hypertoxic chlorine is not used, brine waste is effectively avoided, the environment protection problem caused by waste salts in existing mercaptoacetone oxime production processes is solved, the raw material consumption is effectively reduced, generated hydrogen can be used as clean fuel, and the raw material utilization rate is effectively improved.

The invention provides a method for synthesizing a dicyclohexyl o-fluoroethylbenzene liquid crystal compound, comprising the following steps: (1) using o-fluoro-p-bromoaniline as the raw material to react with sodium nitrite in the presence of hydrochloric acid to generate a compound (I); (2) reacting the compound (I) with acetaldoxime under the catalysis of blue copperas to obtain a compound (II); (3) hydrolyzing the compound (II) with hydrochloric acid to obtain a compound (III); (4) carrying out Huang-Minlon reduction on the compound (III) to obtain a compound (IV); (5) preparing the compound (IV) into a grignard reagent in tetrahydrofuran or diethyl ether, then reacting the grignard reagent with alkyldicyclohexylanone, and acidizing and dehydrating the reactant to obtain a compound (V); and (6) carrying out hydrogenation reduction on the compound (V) to obtain the compound shown in the molecular formula. By synthesizing the intermediate o-fluoro-p-bromoethylbenzene, the invention provides a new method for synthesizing bicyclohexane liquid crystal compound. The method is simple to operate and safe and can effectively improve the purity and the yield of the target compound.

The invention discloses chloro acetaldoxime cleaner production and a RuO2@TNTs anode used for cleaner production. A preparation method of the anode comprises the steps that a titanium mesh subjected to chemical degreasing and cleaning is arranged in a polishing agent for chemical polishing treatment; the titanium mesh is anodized through a two-electrode working system; a newly formed unstable surface layer formed after anodizing of the titanium mesh anode is removed through adhesive tape adsorption; the titanium mesh is used as the anode, the two-electrode working system is used continuously,the voltage is increased, and a nano-structure titanium dioxide array anode (TNTs) is obtained through oxidizing the TNTs anode is oxidized and annealed; ruthenium trichloride, distilled water and concentrated hydrochloric acid are mixed into a mixed solution with 5mM ruthenium trichloride and 0.5 wt% of hydrochloric acid; the annealed TNTs anode is put into the mixed solution; then the mixed solution where the TNTs anode is soaked in is subjected to hydro-thermal treatment; and the TNTs anode is oxidized again and then annealed, and the in-situ-grown nano-structure RuO2@TNTs anode is obtained.

The invention discloses a method for synthesizing amide through nitrile hydrolysis. The method comprises the following steps: adding nitrile, acetaldoxime, water, a water-soluble rhodium complex to a reaction vessel, and cooling to room temperature after reaction of a reaction mixture for several hours at the temperature of 50-80 DEG C; and adding ethyl acetate for extraction so as to obtain an organic layer, and carrying out rotary evaporation to remove a solvent, thus obtaining a target product. Compared with a method for synthesizing amide through nitrile hydrolysis by using oxime as a water source in a transition metal catalysis process, the method has the advantages that a used catalyst is low in loading and does not contain a phosphine ligand seriously polluting environments, synthesis can be performed in air, and nitrogen protection is not needed; and therefore, the method meets the green chemistry requirements and has a wide development prospect.

The invention discloses a preparation method of methomyl. Methylthio acetaldoxime is used as a raw material and reacts with methyl isocyanate in water under the action of a phase transfer catalyst, the temperature is raised to 50-60 DEG C after the reaction is finished, cooling crystallization and filtration are performed after the material is completely dissolved, filtrate and a filter cake are obtained, the filtrate is extracted with an organic solvent, desolvation is then carried out, desolventized solids and the filter cake are combined and dried, and a methomyl product is obtained. The preparation method has the advantages of high yield, low cost, simplicity and convenience in operation and the like.

The invention discloses a method for preparing acetaldoxime by adopting a continuous method, which comprises the steps of filling quartz sand into a reactor, introducing a hydroxylamine hydrochlorideaqueous solution, acetaldehyde and ammonia water serving as raw materials into the reactor, controlling reaction temperature and reaction pressure, adjusting the pH, and collecting the obtained reaction liquid. GC detection shows that that the conversion rate of hydroxylamine hydrochloride is greater than or equal to 99%, and the acetaldoxime selectivity is greater than or equal to 99%. The methodfor continuously synthesizing acetaldoxime has the characteristics of simplicity in operation, safety, reliability, complete hydroxylamine hydrochloride reaction, high selectivity and the like.

The invention relates to the technical field of organic chemical synthesis, in particular to a preparation method of acetaldoxime. The preparation method of acetaldoxime includes the following steps of 1, stirring and dissolving hydroxylamine and distilled water, then adding acetaldehyde and catalytic acetic acid dropwise under an ice water bath condition, conducting stirring for a reaction at 0-10 DEG C for 10-30 minutes after the dropwise addition is completed, and then obtaining an acetaldoxime solution; 2, using dichloromethane for extracting the acetaldoxime solution in step 1, using anhydrous sodium sulfate for drying an extracted liquid, then conducting fractional distillation under normal pressure to obtain a solvent at first, conducting distillation under reduced pressure to collect fractions, and obtaining a colorless transparent liquid, namely acetaldoxime. The preparation method of acetaldoxime adopts acetic acid as a catalyst, hydroxylamine and acetaldehyde are adopted asraw materials to prepare the acetaldoxime solution, and then through extraction, drying, fractionation under normal pressure and distillation under reduced pressure, the colorless transparent liquid,namely acetaldoxime, is obtained. Obtained acetaldoxime is anhydrous, the purity is higher than or equal to 99%, and the yield is higher than or equal to 92%.

The invention is suitable for the technical field of chemical industry production, and provides a production method of thiophene-2-ethylamine. The production method comprises the steps of placing thiophene-2-ethanol and an oxidizing agent in a first solvent to carry out an oxidation reaction to obtain thiophene-2-acetaldehyde; putting thiophene-2-acetaldehyde and hydroxylamine hydrochloride into asecond solvent to react, and purifying to obtain thiophene-2-acetaldoxime; and putting thiophene-2-acetaldoxime and sodium borohydride into a third solvent to carry out reduction reaction, and purifying to obtain thiophene-2-ethylamine. The production method of thiophene-2-ethylamine provided by the invention is simple in process, and comprises the steps of by taking thiophene-2-ethanol as a rawmaterial, firstly preparing thiophene-2-acetaldehyde by an oxidation method, then preparing thiophene-2-acetaldoxime from thiophene-2-acetaldehyde and hydroxylamine hydrochloride, and then reducing thiophene-2-acetaldoxime into a product thiophene-2-ethylamine. The method has the advantages of high product purity, high product conversion rate and high production efficiency.