31 results about "Sulfuric Acid Dimethyl Ester" patented technology

An improved process for production and novel physical forms of butylated hydroxyanisole (BHA) is described wherein tertiary butyl hydroquinone (TBHQ) reacts within a range of about 30 to 50 DEG C with stoichiometrically slight excess of dimethyl sulphate and sodium hydroxide, the sodium hydroxide being added stoichiometrially in slight excess of dimethyl sulphate. Major portion of BHA formed in this reaction was recovered in a crystalline form in which 3-t-butyl-4-hydroxyanisole (3 isomer) is at least at about 99% level, usually at about 99.5% or more, and TBHQ at 100 ppm or less. BHA remaining in mother liquor after crystallization was recovered by distillation and had same purity as the crystalline BHA. The crystalline form was prepared as low density as well as high density form and further could be converted into compressed forms including flakes, tablets and the like.

The invention relates to a preparation method of metribuzin and a treatment method of waste liquid. The preparation method comprises the following steps: carrying out heat-insulation reaction on triazinone and dimethyl sulfate at 75 to 80 DEG C in the presence of p-xylene and concentrated sulfuric acid; after the reaction is finished, cooling to 60 DEG C or below; adding water and quenching the reaction; washing a p-xylene layer, distillating under the reduced pressure and drying to obtain the metribuzin. According to the preparation method provided by the invention, the triazinone, which is convenient to purchase in the market, is used as a raw material, the p-xylene is used as a solvent and the concentrated sulfuric acid is used as a catalyst; the metribuzin is prepared through a methodof dropwise adding the dimethyl sulfate; in the reaction process, few byproducts are produced and the treatment method is simple. In a wastewater treatment link, the p-xylene and water can be recycledand utilized and unreacted triazinone is easy to recycle and reutilize. The method provided by the invention has the advantages of high recycling rate, low cost and short production period and the prepared metribuzin has high purity and meets safety and environment protection requirements.

The invention discloses a bactericidal softener for pure cotton fabrics, which comprises components A and B, component A includes components A, B and C, and its components include the following components in parts by mass: component A: hard 67-75 parts of fatty acid, 21-23 parts of diethylenetriamine as polyamine, 11-15 parts of diethylenetriamine; Component B: 9-11 parts of dimethyl sulfate, 7 parts of diethyl sulfate ‑9 parts, 6‑10 parts of epichlorohydrin, 5‑9 parts of diethyl sulfate; C component: 4‑8 parts of glycerol monostearate, 7‑15 parts of Tween, fatty alcohol polyoxyethylene ether 2‑6 parts; component B: 17‑21 parts of sorbitan stearate, 7‑13 parts of fatty alcohol polyoxyethylene ether, 12‑16 parts of baking soda, 13‑15 parts of sodium tripolyphosphate, ethanol 18-22 parts; the product of the present invention is safe, reliable, green and environmentally friendly, non-toxic, harmless and non-irritating to the human body, and the manufacturing process is simple and easy to operate, the raw materials are easy to obtain, and the production cost is low.

The present invention relates to the field of lithium-ion batteries, and discloses an additive for lithium-ion battery electrolyte, electrolyte and lithium-ion battery. The additive includes additive a, additive b and additive c; the structural formula of the additive a is as structural formula 1 As shown, the additive b is at least one of lithium difluorophosphate, lithium difluorooxalate borate and lithium bisfluorosulfonimide; the additive c is vinylene carbonate, 1,3-propanesulfonate At least one of acid lactone, fluoroethylene carbonate, vinyl vinylene carbonate, vinyl sulfite, vinyl vinyl sulfite, propylene sulfite, dimethyl sulfate, and propylene sulfate. Additives are mixed through several mixtures and applied to the electrolyte of lithium-ion batteries. The electrolyte has excellent overcharge performance, and the electrolyte has excellent flame retardancy; and the lithium-ion battery using this electrolyte has a small Internal resistance and K value, good room temperature cycle performance and high temperature storage performance.

The invention discloses a method for synthesizing theophylline. The method comprises the following steps: performing a methylation reaction on dimethyl sulfate, 6-aminouracil and a sodium hydroxide solution; adding formic acid for a carboxylation reaction; adding a mixed acid solution formed by mixing fuming nitric acid and concentrated sulfuric acid at a volume ratio of (0.8-1.1):(0.9-1.2), and performing heating reflux for a nitrosylation reaction; and finally, adding iron powder and anhydrous acetic acid for a cyclization reaction to obtain theophylline. According to the method disclosed by the invention, the yield is greatly higher than that of the prior art, the operation process is simple, and the reaction conditions are simple.

The invention discloses L-leucine derivatives blocking the entrance of H5N1 avian influenza virus, which are 3,4-dyhydroxyl benzoyl leucine methyl ester and 3,4-dyhydroxyl phenylacetyl leucine methyl ester. The 3,4-dyhydroxyl benzoyl leucine methyl ester is prepared by condensing 3,4-dyhydroxyl benzoic acid with L-leucine methyl ester; the 3,4-dyhydroxyl phenylacetyl leucine methyl ester is prepared by taking 3,4-dyhydroxyl phenylacetic acid as a starting material, treating the 3,4-dyhydroxyl phenylacetic acid by virtue of dimethyl sulphate and thionyl chloride sequentially, then condensing the 3,4-dyhydroxyl phenylacetic acid with L-leucine methyl ester, and then performing demethylation reaction. The compounds, namely, the 3,4-dyhydroxyl benzoyl leucine methyl ester and the 3,4-dyhydroxyl phenylacetyl leucine methyl ester, disclosed by the invention, have a strong inhibitory activity on Influenza strain A / Vietnam / 1194 / 2004 avian influenza virus, and have a mechanism of acting on the entrance phase of H5N1 virus infected cells; and the compounds are a new inhibitor resisting the entrance of avian influenza virus, and can be used as a medicine for preventing or treating H5N1 avian influenza.

The invention discloses a method for preparing an indoline polymethin dye via a one-pot method. The method comprises the following steps of: carrying out condensation and ring closing on phenylhydrazine or para-substituted phenylhydrazine hydrochloride and methyl isopropyl ketone in an alcohol solvent under the catalysis of sulfuric acid so as to generate 2,3,3-trimethylindole or a derivative thereof, adding alkali to carry out neutralization, and carrying out filtration to remove salt; adding an appropriate acid-binding agent in the filtrate, dropwise adding dimethyl sulfate to generate 1,3,3-trimethyl-2--methylene indoline or a derivative thereof; and directly adding 1-phenyl-3-methyl-4-formyl-5-pyrazolone, and carrying out acid catalysis and condensation to generate a target dye. The method has the advantages of being easy to operate, high in yield, low in cost and less in wastewater.

The present invention provides a method of recovering dimethyl sulfate from vacuum gas. The method of recovering dimethyl sulfate from vacuum gas comprises the following steps: step 1, providing a device for recovering dimethyl sulfate; step 2, opening a frozen brine ingress and egress orifice of a vacuum buffer tank, causing the temperature of the vacuum buffer tank to be below 0 DEG C; step 3, turning on a vacuum pump, and when the vacuum in a primary balance barrel reaches -0.1 MPa, opening a valve connected between the primary balance barrel and the vacuum buffer tank, and opening a valveconnected between the vacuum buffer tank and a receiving tank; step 4, opening a steam inlet valve and a drain valve of a rectifying kettle, and extracting dimethyl sulfate in the vacuum gas by meansof the vacuum buffer tank. The method of recovering dimethyl sulfate from vacuum gas provided in the present invention has the advantages of effectively reduced gas flow rate of gas, prolonged gas retention time, high refining and recycling efficiency of dimethyl sulfate, and no wastewater pollution.

The invention relates to the technical field of household paper, and particularly relates to super-soft super-tough household paper and a production method thereof. The household paper is prepared from the following raw materials in parts by weight: 80-120 parts of pulp, 5-10 parts of an oiling agent, 4-8 parts of polyol, 3-7 parts of non-ionic surfactant, 3-7 parts of a softening agent, 3-7 parts of reinforcement fibers, 1-5 parts of a dry strength agent and 1-5 parts of a wet strength agent, wherein the softening agent is mixture of stearin, diethylenetriamine and dimethyl sulfate in a weight ratio of (1.2-1.8):1:(1.6-2.4). The production method comprises the steps of pulping, removing sands, screening the pulp, spraying the pulp, dehydrating, drying, peeling, rolling and packaging. The household paper has good softness, good toughness, good dry and wet strength, environmental friendliness and low cost; and the production method is simple in process, convenient to operate and control, stable in quality, high in production efficiency, energy-saving and environment-friendly.

The invention discloses a preparation method of a cationic liquid dye. The method comprises the following steps: by taking a target dye molecular parent as a starting raw material, dimethyl sulfate asa methylation reagent and weakly alkaline inorganic oxide as an acid-binding agent, carrying out methylation reaction in a weakly acidic system to methylate the target dye molecular parent into target dye molecules; adding water and an organic solvent which is immiscible with water into the system, heating to dissolve, extracting to allow inorganic salt ions to be extracted into a water phase, cooling to room temperature, standing for phase splitting, separating out the water phase, concentrating the organic phase to recover the organic solvent, and preparing the cationic liquid dye from theremaining organic matters. The method is simple and convenient to operate, can be better applied to industrial production, is low in cost, is green and environment-friendly in the whole technologicalprocess, improves the application performance of the existing product, and enlarges the application range of the existing product.

The invention discloses a fabric softener for bamboo charcoal and cashmere blending, which comprises components A, B and C, component B includes components A and B, and its components include the following components in parts by mass: component A: linseed oil 52‑68 parts of acid, 9‑15 parts of hydroxyethylethylenediamine; component B: component A: 5‑9 parts of sodium stearate, 8‑12 parts of sodium pyrophosphate, 7‑9 parts of sodium tripolyphosphate , 33‑38 parts of ethylene glycol; component B: 22‑24 parts of amino silicone oil, 6‑8 parts of polyethylene glycol stearate, 3‑7 parts of glyceryl monostearate, 1‑2 parts of diethyl acid 3 parts, 1-5 parts of dimethyl sulfate; C component: 2-4 parts of benzyl chloride, 0.5-1 part of polyether; the product process of the present invention is simple, the raw material is green and environmentally friendly, and its soft effect on fabrics is good, making The fabric is soft, fluffy and comfortable, does not harden, and is not easy to generate static electricity.