293 results about "Methyl carbamate" patented technology

The invention provides a pymetrozine-containing ultralow volume liquid agent, and belongs to the field of pesticides. The ultralow volume liquid agent consists of pymetrozine or active ingredient compounded by using the pymetrozine and an active ingredient II, and the balance of aids and solvent; and the active ingredient II is any one of bifenthrin, beta-cypermethrin, lambda-cyhalothrin, cyfluthrin, fenpropathrin, deltamethrin, etofenprox, triazamate, tolfenpyrad, chlorantraniliprole, flubendiamide, ethiprole, abamectin, emamectin benzoate, ivermectin, sec-butyl phenyl-N-methyl carbamate, buprofezin, hexaflumuron, flufenoxuron, chlorbenzuron, diafenthiuron, indoxacarb, 1,2-Dibenzoyl-1-tert-butylhydrazine and tebufenozide. The ultralow volume liquid agent is used for preventing and controlling multiple pests on paddy, wheat, corn, vegetables, tobacco, tea trees, fruit trees and sugarcane by ultralow volume spraying, low volume spraying or ultralow volume electrostatic spraying. The ultralow volume liquid agent has the advantages of low water consumption, high effect, long acting time, synergy and the like.

A process for synthesizing methyl aminoformate includes the catalytic reaction between methanol, urea and catalyst at 120-200 deg.C, under 0.1-3 MPa for 0.5-20 hr and condensing and recovering ammonia gas. Its advantages are low cost and high selectivity to product.

The present invention relates to a preparation method of loaded type zirconium oxide catalyst and its application. Its preparation method is characterized by that it utilizes equivoluminal impregnation process or overimpregnation process; the weight percentage content of zirconium oxide in catalyst whole body is 0.1-50%; carrier can be silicon oxide, aluminium oxide, titanium oxide, magnesium oxide, molecular sieve, active carbon or montmorillonite; it uses zirconium oxychloride or zirconyl nitrate to prepare impregnation solution and makes impregnation, then makes drying and roasting processes so as to obtain the invented loaded type zirconium oxide catalyst. Said catalyst can be used in methylcarbonate amine decomposition process process to synthesize methyl carbanilate.

The invention discloses a method for synthesizing diphenylmethane dicarbamate by adopting Bronsted-Lewis acidic ionic liquid catalysis. The method is any one of the following two methods: method A: successively adding methyl phenyl carbamate, a Bronsted-Lewis acidic ionic liquid and formaldehyde in a reactor, reacting for 0.5-5 h at a reaction temperature of 50-90 DEG C to finally obtain diphenylmethane dicarbamate; or method B: successively adding dimethyl carbonate, aniline, formaldehyde and the Bronsted-Lewis acidic ionic liquid in the reactor, reacting for 4-10 h at a reaction temperature of 150-200 DEG C to finally obtain diphenylmethane dicarbamate. The Bronsted-Lewis acidic ionic liquid used in the invention is easy to prepare, combines the functions of solvent and catalyst, and has high catalytic activity, and the product yield can reach more than 99 %.

The invention provides a method for simultaneously producing dimethyl carbonate and dimethyl ether through a urea alcoholysis process, a catalyst used thereby, and a preparation method of the catalyst. The method for simultaneously producing dimethyl carbonate and dimethyl ether through a urea alcoholysis process adopts a two-stage slurry bed reactor or fixed bed reactor technology, and in the preparation process, when dimethyl carbonate and dimethyl ether are prepared from methyl carbamate and methanol in a second-stage fixed bed reactor, a multi-component composite oxide catalyst using one or more of transition metal oxides, rare earth oxides, alkali metal oxides, alkaline earth oxides, IVA group metal oxides, VA group non-metal oxides or IIIA group non-metal oxides and Al2O3 as active components is filled into the fixed bed reactor, so the methyl carbamate conversion rate is improved, and the dimethyl carbonate and dimethyl ether selectivity is substantially improved.

The invention provides a process for co-producing dimethyl carbonate and dimethyl ether by a urea alcoholysis method. The method comprises the following steps: adding methanol and urea in a reaction device for reaction so as to generate methyl carbamate and by-produce ammonia; further reacting generated methyl carbamate with methanol so as to generate dimethyl carbonate and by-produce ammonia, wherein a part of dimethyl carbonate is decomposed to generate dimethyl ether; separating out a material containing dimethyl ether and a material containing dimethyl carbonate from a material discharged from the reaction device; separating out dimethyl ether from the material containing dimethyl ether; and separating out dimethyl carbonate from the material containing dimethyl carbonate.

The invention relates to a metaflumizone synthesis method, in particular to a metaflumizone pesticide synthesis method, belonging to the field of agricultural insecticides. The method is formed by the following steps: synthesis of p-trifluoromethoxybenzene methyl carhamate, synthesis of p-trifluoromethoxybenzene aminooxamide and synthesis of metaflumizone. The invention has the advantages that the preparation method is simple and practical, the efficiency is high and the yield of products at each step is more than 85 percent; the toxicity of the reagent used during the synthesis processes is low, the solvent can be recycled, the side reaction is less, the corrosion to the device is low and the environmental pollution is low; and since the price of the raw materials is cheap, the production cost is reduced, the economy is good and the application prospect is good.

The invention relates to a water-soluble triazole antiseptic anti-discoloration insect repellent composite for timber and bamboo wood as well as a preparation method and application thereof. Based on the total weight of the composite, the composite comprises the following components in percentage by weight: 3-8% of triazole compound, 24-48% of organic solvent, 24-40% of cosolvent, 3-10% of N-(2-benzimidazolyl)-methyl carbamate hydrochloride, 0-10% of prochloraz, 0.1-0.8% of esbiothrin insecticide and the balance of water, wherein the triazole compound is propiconazole, tebuconazole, cyproconazole or any combination of propiconazole, tebuconazole and cyproconazole. The composite can be used for processing timber and bamboo wood or timber and bamboo wood products indoor and outdoor. In the processing method, a vacuum pressurization or normal-pressure dipping method are used so that the processed timber and bamboo wood or timber and bamboo wood products have the antiseptic, anti-fungus discoloration and mothproof properties.

The invention provides high-durability floor wax, and belongs to the technical field of a furniture cleaning agent. The high-durability floor wax comprises the following raw materials by weight: 20 to 30 parts of wax, 3 to 6 parts of beewax, 2 to 3 parts of oxidized polyethlene wax, 5 to 8 parts of Vaseline, 2 to 5 parts of triethanolamine, 5 to 10 parts of stearic acid, 3 to 7 parts of cellulose, 1 to 3 parts of butoxy triethyl phosphate, 2 to 4 parts of diglycol diethyl ether, 1 to 3 parts of dioctyl maleate, 2 to 3 parts of surface active agent, 4 to 6 parts of simethicone, 2 to 4 parts of emulsifying agent, 3 to 6 parts of odorless kerosene, 3 to 5 parts of ammonia water, 1 to 2 parts of benzimidazole methyl carbamate, 2 to 3 parts of silane coupling agent and 200 to 400 parts of water. With the adoption of the floor wax provided by the invention, the glossiness of the surface of a floor can be effectively improved, scratches can be shielded, and the damage of the friction on the floor surface to the floor can be effectively prevented; and after being subjected to a friction test, the floor wax also has high brightness and has no scratch.

The invention relates to a rapid detection method for residual pesticides. The invention reveals an acetylcholinesterase-based color-developing method for the first time, and in the method, a special color-developing agent is adopted, so that negative and positive color-developing results are extremely obvious, and can be directly judged by naked eyes without using a spectrophotometer, therefore, the method has a good application prospect in the field of rapid detection on residual pesticides.

The invention relates to a synthetic methodsynthesis method for albendazole, which is characterized in that benzimidazole -2 - methyl carbamate (carbendazim) is taken as raw material to generare 5-nitrobenzene and imidazole -2-methyl carbamate through nitration reaction, or generare 5- amino benzimidazole -2 - methyl carbamate through reduction reaction, or generate 5 - amino benzimidazole -2 - methyl carbamate through diazotization and substitution reaction, or generate albendazole through alkylation reaction. The method of the invention has simple and convenient synthetic route, mild conditions and high product quality, with the total yield reaching more than 58%.

The invention discloses a separation and determination method of the optical isomer of Palonosetron HCl; the separation and determination method comprises the resolution of the optical isomer of the Palonosetron HCl by high performance liquid chromatography, wherein, amylose-three (3,5-xylyl methyl carbamate) is used as the filler by normal phase chromatographic columns, the volume ratio of mobile phase n-hexane: alcohol: diethylamine is 75-95: 5-25: 0.1-0.5, the column temperature for separating R. R isomer, R. S isomer and S. S isomer is 15 to 25 DEG C, while the column temperature for separating R. R isomer, S. S isomer and S. R isomer is 35 to 45 DEG C. The method of the invention provides an important basis for the quality monitoring of Palonosetron HCl material.

The methyl carbamate producing process belongs to the field of fine chemical technology. The technological scheme of purifying methyl carbamate includes: dissolving urea in methanol to obtain methanol solution of urea of 0.01-10 mol/L concentration, reaction in reactor at 100-180 deg.c and 0.1-1.5 MPa for 0.5-10 hr, condensing in condensator to separate ammonia and making ammonia produce ammonia water, returning methanol with ammonia separated to the reaction system, and product purification. The present invention has high methyl carbamate yield, simplified operation, short reaction period, low power consumption and low cost.

The invention discloses an antifouling paint and a preparation method thereof and relates to the technical field of chemical engineering. The antifouling paint comprises the following components by weight percent: 8-12% of 40% vinyl chloride-vinyl isobutyl ether copolymer liquor, 17-23% of 60% rosin resin liquor, 18-25% of cuprous oxide, 2-4% of chlorinated paraffin, 2-5% of tetrachloroisophthalonitrile, 4-6% of 5-isopropyl-m-toluene methyl carbamate, 2-4% of anhydrous cupric sulfate, 8-12% of 95% zinc oxide, 4-6% of 4% copper naphthenate, 11-14% of iron oxide red powder, 1-3% of talcum powder, 0.2-0.8% of bentonite and the balance of xylene. The antifouling paint can be used for solving the problem that an object on the bottom of a ship or soaked in seawater can be easily stained by animals and plants in the seawater.

The invention discloses a method for preparing 5-methylbenzimidazole-2-methyl carbamate. Three reaction steps, namely cyanamide formation, acidification and ring closing are performed, operating procedures are simplified, strong base such as sodium hydroxide is adopted for cyanamide formation, hydrochloric acid is adopted for acidification, sodium thiosulfate is adopted for catalyzing ring closing, waste acid is reduced, and pollutants are reduced on the premise of ensuring product quality and yield. The method comprises the following step of: performing cyanamide formation reaction, acidification reaction and ring closing reaction on methylclhlorofonmate serving as a raw material to obtain the product, wherein in the cyanamide formation reaction, the methylclhlorofonmate is reacted with cyanamide under the alkaline condition to form methylcyanocarbamate salt; in the acidification reaction, the methylcyanocarbamate salt is reacted with the hydrochloric acid to form methylcyanocarbamate; and in the ring closing reaction, the methylcyanocarbamate and 4-methoxy-o-phenylenediamine are subjected to condensation reaction to form the 5-methylbenzimidazole-2-methyl carbamate.

The invention relates to a method for preparation of methyl carbamate. The method comprises the steps of: reacting urea with methanol in a reaction kettle to generate a reaction product containing methyl carbamate and ammonia; leading the ammonia out of the reaction kettle in batches, and at the same time, inputting the exported ammonia into a urea synthesis device as a raw material to react with carbon dioxide, thus generating urea again. Specifically, the charging mole ratio of urea to methanol in the reaction kettle is 1:6-10, the reaction in the reaction kettle occurs at 150-200DEG C, and the corresponding pressure in the reaction kettle is 1.5-2.0MPa. The method is characterized in that the methyl carbamate is prepared by taking urea and methanol as raw materials under intermediate temperature and pressure without catalyst, the rate of conversion from urea to methyl carbamate is improved, the production cost is reduced, and by means of the reaction converting the exported ammonia into urea, the greenhouse gas carbon dioxide is consumed, thus being beneficial to environmental protection. The invention also provides equipment for preparing methyl carbamate.

The invention provides a technology for synthesizing pyraclostrobin by a six-step method. The synthesis technology comprises the following steps: 1) performing a reduction reaction of ortho-nitrotoluene; 2) performing an acylation reaction of hydroxylamine; 3) performing a methylation reaction; 4) obtaining N-methoxyl-N-2-bromomethyl phenyl methyl carbamate through a bromination reaction; and 5) performing synthesis of 1-(4-chlorophenyl)pyrazolidine-3-ketone; and 6) performing synthesis of pyraclostrobin. Compared with the prior art, the preparation method has the advantages of simple process, easily available raw materials with low cost, and mild reaction condition, and the purity and yield of the target products are high.

The invention relates to a lubricating oil for joints of an injection molding machine. The lubricating oil is prepared from the following raw materials by weight: 85 to 95 parts of mineral-based oil, 15 to 25 parts of polyoxyethylene nonyl phenyl ether, 3 to 5 parts of hexachlorocyclopentadiene, 3 to 5 parts of dithioglycol, 5 to 10 parts of propolis extract, 5 to 10 parts of alga extract, 10 to 15 parts of graphene, 5 to 10 parts of modified zircon powder, 1 to 3 parts of methyl carbamate and 2 to 4 parts of benzimidazole. The lubricating oil provided by the invention has good abrasion resistance, resistance to tarnishing, heat stability, anti-foaming performance, good sealing adaptability and high cleanliness and can meet requirements of the hydraulic system of the injection molding machine on lubricating oil. The lubricating oil has high adhesion and is not prone to rapid loss. A preparation method for the lubricating oil is simple, convenient for industrial production and low in cost.

The present invention relates to a catalyst for synthesizing methyl carbanilate, its preparation process and application method. Said catalyst is formed from TiO2 and ZnO according to mole ratio of 1:0.2-5. The catalyst, phenylamine and methyl carbonate are added into a high-pressure kettle, heated to 90-200 deg.C and reacted for 1-20 hr so as to obtain the invented product methyl carbanilate. Said invention also provides the concrete steps of its preparation method of said catalyst.

The invention relates to a preparation method for 5-(4-fluorophenyl-sulfonyl)-benzimidazole-2-methyl carbamate. The method includes (1) using p-aminophenol as raw materials, and preparing a number of new 3-nitro-4-substituted aminophenol intermediates through acylation and denitrification; (2) carrying out a condensation reaction of 3-nitro-4-substituted aminophenol intermediates with the 4-fluorophenylsulfonyl chloride in the alkaline solution, and hydrolyzing to obtain 2-nitro-4-(4-fluorophenyl-sulfonyl)-aniline intermediates; (3) carrying out a reduction reaction of 2-nitro-4-(4-fluorophenyl-sulfonyl)-aniline intermediates to obtain 4-(4-fluorophenyl-sulfonyl)-o-phenylenediamine intermediates; and (4) carrying out a closed loop reaction of closed-loop agents and 4-(4-fluorophenyl-sulfonyl)-o-phenylenediamine to obtain 5-(4-fluorophenyl-sulfonyl)-benzimidazole-2-methyl carbamate. This invention has the advantages of high yield, small unit consumption, and low cost. The raw materials are cheap and the method is easy for industrialized production.

A film-spreading oil agent capable of preventing and curing rice planthopper comprises the components by weight percent: 10-60 percent of effective component, 3-85 percent of additive, 0-70 percent of filling material, 5-14 percent of water surface diffusant, and 0-15 percent of water, wherein the effective component is one, or combination of any two selected from chlorpyrifos, diazinon, dichlorvos, imidacloprid, thiamethoxam, clothianidin, thiacloprid, thiazoline, nitenpyram, dinotefuran, pymetrozine, isoprocarb, fenobucarb, metolcarb, methyl carbamate, sulfoxaflor and flonicamid, and the weight ratio of the two effective components under two ways is (1:10)-(10:1). The oil agent has the technical effects that the effect of preventing and curing the rice planthopper is improved, the operation is simple, labor and time are saved, no harm is caused for human body, and no pollution is caused for the ambient condition when the oil agent is applied; moreover, the utilization ratio of the effective component is improved, the labor intensity is reduced, the labor is saved, and the agricultural production cost is reduced.

The invention relates to synthesis of methyl carbamate (MC) and dimethyl carabonate (DMC) in presence of stripping inert gas or superheated methanol vapors using packed column reactor and bubble column reactor.

The invention relates to a synthesis method for tofacitinib serving as a JAK inhibitor. According to the method, the tofacitinib is prepared by taking (4-picoline-3-yl)methyl carbamate as a raw material, and performing catalytic hydrogenation, benzyl protection, reduction, salification, separation, deprotection and amidation salification. The method specifically comprises the following steps: (1) performing catalytic hydrogenation and reduction on (4-picoline-3-yl)methyl carbamate in sulfuric acid and Pd/C; (2) reacting cis-(4-picoline-3-yl)methyl carbamate and benzyl chloride to obtain cis-(1-benzyl-4-methylpiperidine-3-yl)methyl carbamate; (3) performing HOBT catalytic condensation on N-[(3R,4R)-4-methylpiperidine-3-yl]-N-methyl-7H-pyrrolo[2,3-d]pyrimidine-4-amine and cyanoacetic acid to obtain tofacitinib free alkali. The preparation method provided by the invention has easily obtained raw materials, mild reaction conditions, easiness and convenience in operation and high yield, and is suitable for industrial production.

The invention discloses a preparation method for a heterogeneous phase catalyst. The method comprises the steps of treating a mixture of one or more selected from MnO2, Fe2O3, Co2O3, NiO, CuO, ZnO, PbO and PbO2 for some time at a high temperature with a solvent, cooling the mixture, taking the mixture out, filtering, washing and drying the mixture to obtain the catalyst. The prepared catalyst can be used in synthesis of 1,6-hexamethylene-dimethylurethane, 1,6-hexamethylene-diethylurethane and 1,6-hexamethylene-dibutylurethane. In a batch reactor, 1,6-hexamethylene-dimethylurethane, 1,6-hexamethylene-diethylurethane and 1,6-hexamethylene-dibutylurethane are synthesized by using1,6-hexamethylene diamine (HDA), methyl carbamate, ethyl carbamate, butyl carbamate and a solvent such as methanol, ethanol and butanol in the presence of the catalyst. The process for preparing the catalyst is simple; the operations of the reaction are safe and simple; and yield and selectivity can reach higher than 96%.

The invention discloses a nano silicon dioxide modified wood production method including five steps of pretreatment, preparation of a wood modification agent, preparation of a wood modification fluid, dipping treatment and post-drying treatment, wherein the wood modification agent comprises nano silicon dioxide, fatty alcohol polyoxyethylene ether, distilled water, trimethyl borate, dodecyl dimethyl benzyl ammonium chloride, N-(2-benzimidazole)-methyl carbamate, and imidacloprid. The beneficial effect is that the nano silicon dioxide modified wood production method has the advantages of simple treatment process, easy operation, low cost, good treatment effect, no toxicity, environmental friendliness and the like, the treated wood has no obvious appearance change, and wood dimensional stability, density, surface hardness, bending strength and bending elastic modulus, good processing properties, wear resistance, anti-corrosion flame retardant properties are greatly increased.