103 results about "Dimethyl sulfite" patented technology

The invention discloses a preparation method of ethylene sulfate. The method comprises the following steps: firstly, ethylene glycol and thionyl chloride are used as raw materials to synthesize ethylene sulfite, the ethylene sulfite and air or oxygen are subjected to a direct oxidation reaction under the action of a catalyst to form ethylene sulfate, filtration is performed, washing is performed by using water, concentration is performed, crystallization is performed, and therefore the finished-product ethylene sulfate is obtained. The method provided by the invention adopts the novel catalystand uses the air or the oxygen as an oxidant, thereby effectively reducing use costs of the catalyst and the oxidant; and the method has less waste water, thereby being more in line with concepts ofenergy saving, greenness and environmental protection.

Continuous synthesis of glyphosate by dimethyl ester is carried out by taking paraformaldehyde, amino acetic acid and dimethyl ester as raw materials to obtain synthetic liquid, acidizing it with hydrochloric acid, mixing, entering into hydrolytic reactive zone, reacting in hydrolytic reactor continuously, acidizing synthetic liquid, hydrolyzing in hydrolytic reactive zone continuously, forming into glyphosate salt, batching continuously and neutralization crystallizing to obtain the final product. It realizes continuous hydrolysis and simplifies process and can be used in large-scale production.

The invention discloses a health- caring wine containing good effective element. The wine with alcohol degree being 15- 75 (V / V %) comprises maltol, borneo camphor, cedrol, dimethyl trisulfide, dimethyl bisulfide, ligustrazine, daidzein, crust and puerarin, which not only changes wine color, but aslo does not influence waste, no toxic action. The health- care wine can improve bloos circulation, reduce blood pressure, reduce blood fat and promote circulation of qi and relieve pain, resist tumor and cause head pain after excessive drink.

The invention relates to a production process for preparing dimethyl sulfate by composite acid through catalytic dehydration, which solves the problems of high consumption of sulphuric acid and methanol during production and more serious production pollution in the prior domestic production of dimethyl sulfate due to the adoption of conventional sulphuric acid-methanol method. The production process is characterized in that composite acid catalyst is adopted to carry out dehydrated etherealization of vaporized methanol to generate dimethyl ether gas; after purification, dimethyl ether gas reacts with dimethyl sulfate rich solution absorbing sulfur trioxide to generate a crude product of dimethyl sulfate; and an eligible finished product of dimethyl sulfate is obtained through reduced pressure distillation. The production process is suitable to be used in small and medium-sized methanol production enterprises or sulphuric acid production enterprises taking dimethyl sulfate as a downstream product.

The invention relates to a novel process for synthesizing p-xylene glycol dimethyl ether. The synthesis method takes hydrochinone and dimethyl sulfate as raw materials, and obtains the product through substitution inside an alkaline medium. Moreover, the synthesis method has the technological characteristics that by means of the principle of equilibrium shifting, the product is moved out of a reaction system during reaction, thereby accelerating reaction and ensuring complete reaction; in the prior synthesis process, the auxiliary raw material dimethyl sulfate no longer participates in reaction when reacted to generate monomethyl sodium sulfate, and the theoretical utilization rate of dimethyl sulfate is only 50 percent; therefore, the method greatly increases the utilization rate of dimethyl sulfate, and reduces the consumption of dimethyl sulfate by 40 percent; meanwhile, reaction yield is also increased to a certain extent; moreover, because the process makes use of the special characteristics of azeotropic distillation of the product and water, the product obtained during reaction can be moved out in time, while the reaction raw materials and intermediate product para hydroxyanisole are stored in a reactor in the form of sodium salts in the alkaline medium and do not enter the product when distilled out along with water vapor; therefore, the product has extremely high purity and can be obtained without adopting the prior alcohol refining; and the novel process ensures greatly simplified production process, higher production safety, lower production cost and labor intensity and better operating environment for workers, thereby having significant social benefit and economic benefit.

The embodiment of the invention provides a method for removing residues out of dimethyl sulfate, belonging to the technical field of chemical purification. The method comprises the steps: adding a catalyst and a hydrogen peroxide solution with the mass concentration of 30-70%, reacting at the temperature of 35-55 DEG C, removing residues, and separating the catalyst and water to obtain high-purity dimethyl sulfate after the reaction is finished, wherein the usage amount of the hydrogen peroxide solution is 0.15-0.35% of that of the dimethyl sulfate, the usage amount of the catalyst is 0.05-0.2% of weight of the dimethyl sulfate, and the catalyst comprises manganese dioxide, calcium oxide, cobalt sulfate or copper sulfate. The method for removing residues, provided by the invention, can be used for effectively removing the residues such as CHOSO3H, SO2 and (CH3O)2SO out of the dimethyl sulfate, and a treated dimethyl sulfate product contains more than or equal to 99.5% of DMS, less than or equal to 20ppm of SO2 and less than or equal to 30ppm of (CH3O)2SO, so that the removing effect is very remarkable.

The invention discloses a making method of toluenediamine methyl formate of nanometer zinc oxide, which comprises the following steps: adding diaminotoluene, zinc acetate and dimethyl ester carbonate in the autoclave with molar rate at 1:0.01-0.7:15-30; sealing the autoclave; stirring; reacting under 100-200 deg.c for 1-10h; filtering; decompressing to rectify under 30-70 deg.c at 5-30Kpa; obtaining the solid product (toluenediamine methyl formate); washing filter pie; drying in the vacuum; obtaining the nanometer zinc oxide.

The invention puts forward a novel process for synthesizing 1,6-dimethoxynaphthalene. The process comprises the steps of adding sodium hydrosulfite for preventing oxidation to a medium of petroleum ether and NaOH aqueous solution, adding quaternary ammonium salt as a phase transition catalyst, using dimethyl sulfate to methylate 1,6-dihydroxynaphthlene, adding NaOH aqueous solution and dimethyl sulfate by stages, performing reaction at a temperature between 50 and 60 DEG C and preparing the 1,6-dimethoxynaphthalene. In a first stage, the weight ratio of petroleum ether, the NaOH aqueous solution, the sodium hydrosulfite, the quaternary ammonium salt and the dimethyl sulfate to the 1,6-dimethoxynaphthalene is 4.5-8:1, 4.6-6:1, 0.02-0.06:1, 0.02-0.05:1 and 1.2-1.8:1 respectively; the time of dripping the dimethyl sulfate is 10 to 60 minutes; and in a second stage, the weight ratio of the added NaOH aqueous solution and the dimethyl sulfate to the 1,6-dimethoxynaphthalene is 2.3-3:1 and 0.88-1.2:1 respectively. The method has the advantages that reaction conditions are easy to control; the petroleum ether can be recovered and indiscriminately used; and the 1,6-dimethoxynaphthalene is high in purity and does not need to be refined by use of solvents.

The invention discloses a preparation method of 4-methylanisole. The method includes: using p-cresol and sodium hydroxide as the raw materials to prepare p-methylphenol sodium; allowing the p-methylphenol sodium and dimethyl sulfate to have methylation in a nonpolar solvent to prepare the 4-methylanisole and byproduct sodium methylsulfate; allowing the p-methylphenol sodium and the byproduct sodium methylsulfate to have reaction in a polar solvent to prepare the 4-methylanisole and sodium sulfate. The method has the advantages that the 4-methylanisole is prepared through the three-step reaction, the utilization rate of the dimethyl sulfate is increased, and wastewater zero discharge is achieved.

Electrolyte of a lithium ion battery consists of lithium salt and an organic solvent, wherein the lithium salt is one of bis-oxalic acid lithium borate and lithium difluoroborate or a mixture of the bis-oxalic acid lithium borate and the lithium difluoroborate, the organic solvent consists of a component A, a component B and a component C, the component A is sulfolane, the component B is a linear carbonic ester compound or a linear sulfite compound or a mixture of the linear carbonic ester compound and the linear sulfite compound, and the component C is a cyclic carbonate compound. The molar concentration of the electrolyte lithium salt is 0.4-1.5 mol / L. The volume percentage of the sulfolane SL in the electrolyte is 11%-70%. The linear carbonic ester compound is one or more of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate, and the volume percentage of the linear carbonic ester compound in the electrolyte is 0%-70%. The linear sulfite compound is one or more of sulphurous acid dimethyl ester and sulphurous acid diethyl ester, and the volume percentage of the linear sulfite compound in the electrolyte is 0%-70%.