47results about How to "High main content" patented technology

A process for preparing Cr2O3 by continuous thermodecomposition of chromic acid includes such steps as proportionally mixing chromic acid, coarse Cr2O3 as returning charge and additive chosen from boric acid (preferable), ammonium chloride, starch and saw dust; after uniformly mixing under a computer control, parallel-flow combustion of the said mixture and liquefied gas as fuel in an insulated rotary furnace, thermodecomposition reaction to generate Cr2O3, keeping the temp. for a certain time, cooling and pulverizing to obtain the product. The unpulverized material is used as the said returning charge.

The invention discloses a preparation method of thiodicarb. The preparation method comprises the following steps: (1) dividing a solvent into two portions, dissolving methomyl in one of the two portions to obtain a methomyl solution, and dissolving 4-dimethylaminopyridine in the other portion to obtain a solvent which contains a catalyst; and (2) dividing sulfur dichloride into two portions, dropwise adding one portion of the sulfur dichloride in the solvent which contains the catalyst under a closed condition, meanwhile, dropwise adding the other portion of sulfur dichloride and carrying outdropwise adding reaction on the other portion of sulfur dichloride and the methomyl solution obtained in step (1), and carrying out insulating reaction after dropwise adding is finished to obtain thethiodicarb. The preparation method of the thiodicarb has the advantages that the reaction selectivity is high, the purity of the obtained product is high, the content of thiodicarb isomer is smaller than 0.4%, the yield is high and the like.

The invention provides equipment and a process for recovering a glyphosate solvent during production with glycine method, particularly relates to a glyphosate solvent recovery continuous production and gas-phase method recovery technology, and aims to overcome the defects of operation intermittence, high labor intensity, high energy consumption, low methyl chloride purity and the like in the prior art. Continuous production in an entire procedure is realized, so that the content of methyl chloride is increased to 99.9 percent, and the energy consumption is lowered. The equipment and process are widely applied to the field of glyphosate production.

The invention discloses a new synthesizing technique of solvent yellow 163, which comprises the following steps: adopting 1, 8-dinitroanthraquinone as raw material to react with thiophenol in the strongly polar solvent of dimethyl formamide or dimethyl acetamide based on potassium hydroxide as acid-attaching agent at 30-100 deg. c to make the solvent yellow 163; cooling below 30 deg. c after finishing the reaction; filtering until the product is evolved sufficiently; washing the filter pie; drying; obtaining the product. The method reduces the manufacturing cost greatly and improves the main content of the product obviously, which modifies the appearance of the product with simple operation and easy control, in order to stabilize the manufacturing and increase the economical benefit.

The invention discloses a comprehensive recovery method of a waste lithium manganate and lithium iron phosphate positive electrode material. The recovery method aims at solving the technical problemsthat in the prior art, the energy consumption is large, the energy utilization rate is low, certain potential safety hazards exist, meanwhile, the environment is greatly damaged, and process conditiondetails are difficult to control in the process operation process. The method comprises the steps of lithium iron phosphate powder size mixing, lithium manganate reduction leaching, lithium iron phosphate oxidation leaching, solid-liquid separation, washing, neutral impurity removal, alkaline impurity removal, concentration and sodium precipitation, and lithium precipitation, recovery of the waste lithium manganate and the lithium iron phosphate positive electrode material to obtain battery-grade lithium carbonate. The recovery method can be used for simultaneously recovering and treating thepositive electrode materials of the two waste lithium ion batteries; an oxidizing agent and a reducing agent needed in the prior art do not need to be added, high-temperature reaction is not needed,energy consumption is low, the energy utilization rate is high, meanwhile, the process is simple, the comprehensive recovery rate is high, the technological process is energy-saving, environment-friendly and high in safety, and high economic benefits are achieved.

The invention discloses a method capable of increasing the content and yield of gamma-chloropropyltriethoxysilane simultaneously, and the method comprises the following steps: adopting gamma-chloropropyltrichlorosilane prepared by the reaction of trichlorosilane and chloropropene to react with ethanol and finally obtaining gamma-chloropropyltriethoxysilane though esterification, neutralization anddistillation. The invention adds lithium chloride, 4-methylaminopyridine and fatty alkyl dimethyl tertiary amine as esterifying catalyst in esterification reaction for the synergetic catalysis to thereaction between gamma-chloropropyltrichlorosilane and ethanol so as to increase the product content, greatly increase the conversion rate of gamma-chloropropyltrichlorosilane, increase the product yield, inhibit the side effect, shorten the reaction time, reduce the impurity content of the product and reduce the Cl<-> content in the product of which target value is not more than 50ppm.

The invention discloses a new synthesizing technique of solvent yellow 189, which comprises the following steps: adopting 1, 5-dinitroanthraquinone as raw material to react with thiophenol in the strongly polar solvent of dimethyl formamide or dimethyl acetamide based on potassium hydroxide as acid-attaching agent at 30-100 deg. c to make the solvent yellow 189; cooling below 30 deg. c after finishing the reaction; filtering until the product is evolved sufficiently; washing the filter pie; drying; obtaining the product. The method reduces the manufacturing cost greatly and improves the main content of the product obviously, which modifies the appearance of the product with simple operation and easy control, in order to stabilize the manufacturing and increase the economical benefit.

The invention discloses a production process of lambda-cyhalothric acid and belongs to the field of organic synthesizing. The lambda-cyhalothric acid is produced by dimethyl-4-pentenoic acid methyl ester, trifluorotrichloroethane and potassium 2-methyl-2-butoxide through addition, cyclization, saponification, acidification and refining. The production process has the advantages that the potassium2-methyl-2-butoxide used as the catalyst of cyclization reaction is high in selectivity and can increase cyclic compound cis-trans ratio; ethylene glycol is used as the solvent in the saponification process for the first time, a used staged heat preservation method can greatly lower the generation of side reaction, increase main content and increase reaction yield, reaction cycle can be shortenedgreatly, and productivity can be increased.

The invention discloses a method for recovering and purifying boron carbide from sapphire grinding wastes. The method comprises the following steps: S1, screening sapphire grinding wastes by a 200-mesh sieve to obtain a magnetic separation raw material; S2, carrying out magnetic separation on the magnetic separation raw material to remove iron impurities, so as to obtain an acid-soluble raw material; S3, placing the acid-soluble raw material in an acidification medium for acid dissolution to remove siliceous impurities, and obtaining a hydrothermal raw material through first-time solid-liquidseparation; S4, mixing the hydrothermal raw material with an alkaline solution, carrying out a hydrothermal reaction for 1-20h at 150-300 DEG C, and obtaining a hydrothermal product through second-time solid-liquid separation; and S5, carrying out water dissolution, third-time solid-liquid separation and drying on the hydrothermal product to obtain recovered boron carbide. According to the methodfor recovering and purifying boron carbide from the sapphire grinding wastes, provided by the invention, the recovery of boron carbide ultra-fine powder in the sapphire grinding wastes is realized, resources and energy consumption are greatly saved, the recovered boron carbide obtained through recovery meets an abrasive-grade requirement, and can be directly used, and the recovery rate of the boron carbide ultra-fine powder reaches 96% or more.

The invention relates to the chemical industry field, particularly to a diffusion pump oil synthesis method, which specifically comprises: (1) carrying out a hydrolysis reaction on methyl triethoxysilane to obtain 1,3-dimethyl-1,1,3,3-tetraethoxydisiloxane (short for compound B); (2) under a strong alkali condition, carrying out balanced telomerization on the compound B and a dimethyl ring body or methylphenyl ring body to obtain a compound D; (3) carrying out a sodium condensation reaction on the compound D, chlorobenzene and sodium to obtain the diffusion pump oil. According to the present invention, the reaction order is re-combined, and the method has advantages of low energy consumption and environmentally friendly process compared to the method in the prior art.

The invention provides a low-temperature reduction technology of ilmenite. The technology comprises the following steps: mixing ilmenite and pulverized coal based on the mass ratio of 5: 1-1.2 under normal temperature condition; conveying the material into a rotary kiln or a tunnel kiln after mixing; igniting the pulverized coal; heating until the temperature is 600-700 DEG C, and reacting for 0.5-1h; cooling until normal temperature is reached after reaction; treating the cooled material through an airflow classifier; and magnetically separating twice, namely, magnetically separating for thefirst time under 1000-2000Gs to obtain titanium-containing magnetite and tailings, and magnetically separating the tailings for the second time under 5000-8000Gs to obtain ilmenite concentrate. According to the technology, pulverized coal is treated as a reducing agent, and the rotary kiln or the tunnel kiln is provided, so that the solubility of the ilmenite can be obviously improved under intermediate and low temperature conditions, and meanwhile, the main TiO2 content can be increased, and the titanium-containing magnetite and quality ilmenite concentrate can be obtained; the production cost of titanium dioxide is decreased, and the quality of the titanium dioxide is increased.

The invention discloses a boron carbide smelting device. The boron carbide smelting device comprises a smelting furnace body, wherein the smelting furnace body is built by refractory bricks and comprises a bottom plate and side walls surrounding the bottom plate, and an opening is formed in the top of the smelting furnace body and allows buckling of a sunken type cover plate provided with exhaustholes; the smelting furnace body is filled with smelting raw materials; a positive pole and a negative pole are inserted into two opposite side walls of the smelting furnace body and both penetrate into the smelting furnace, end parts of the positive pole and the negative pole are opposite, and accordingly, the power is switched on for heating and smelting the smelting raw materials; the sunken type cover plate is gradually sunken with phase transformation of the smelting raw materials. The invention further discloses a boron carbide preparation method based on the boron carbide smelting device. According to the boron carbide smelting device, boron carbide is prepared with a nearly closed high-temperature treatment method, impurity pollution is reduced, product crystallinity is good, maincontent of the obtained boron carbide products is higher than 95%, and the products meet the abrasive material requirement after grading and meet the quality requirement of the grinding industry or the engineering ceramic field for boron carbide powder.

The invention discloses a high-purity zirconium oxychloride extraction process, which comprises the following steps: (1) alkali fusion, (2) water washing and filter pressing, (3) transformation, (4) acidification, (5) primary cooling crystallization, (6) dissolution and filtration, (7) extraction, (8) concentration, (9) secondary crystallization and (10) acid washing and filtration. According to the invention, an extraction process is added after the filter-pressing silicon removal process; ferric oxide and some impurities in the clear liquid are extracted into an extracting agent by using theextracting agent, so that the content of the impurities in the clear liquid is reduced, the content of the ferric oxide can be controlled to be below 1ppm, the residual impurities in the crystal areleached out by using a leaching method, the content of the impurities is reduced, and the main content of the product is increased.

The invention belongs to the technical field of fine chemical product preparation and relates to a preparation method of a gamma-chloropropyl triethoxysilane coupling agent. The preparation method comprises the following steps: adding a systhesis raw material gamma-chloropropyl trichlorosilane in an overhead tank into a glass lining synthesis kettle through a rotor flow meter so as to carry out one-step synthesis between the synthesis raw material and ethanol, timely discharging a by-product HCl gas produced by the synthesis in vacuum through an exhaust pipeline to enter a hydrochloric acid recovery tank; carrying out secondary synthesis by pumping the one-step synthesis liquid into the bottom of a heater through pipe connection by the use of a matching pump by the utilization of pipeline liquid level difference; adding a synthesis raw material absolute ethyl alcohol in the overhead tank into an absolute ethyl alcohol evaporation container through the rotor flow meter so as to carry out vaporization and then entering a main tower; and carrying out separation of components by the utilization of boiling point gradients of different components while carrying out third synthesis. The preparation method has advantages of reliable principle, low production cost, high conversion rate, large capacity, low energy consumption and high main content, is environmentally friendly, and is suitable for large-scale production.

The invention relates to a separation method for a mixture of ethanol, diphenyl carbonate and diphenyl carbonate. The method comprises the following steps: feeding a thermal solution of ternary mixedorganic waste liquor of ethanol, DPC and DBP into a crystallizer to be cooled circularly, wherein the feed liquid temperature is reduced to be lower than constant temperature; then separating the feedliquid through a centrifugal machine, wherein solid crystals are DPC, and a liquid is a mixed solution of ethanol and DBP; feeding the mixed solution of ethanol and DBP into an evaporator, controlling the quantity of steam and the material feeding amount by adopting a temperature variable of the evaporator, and evaporating and separating the mixed solution, wherein ethanol escapes from the upperpart and is cooled by circulating cooling water, to obtain an ethanol liquid; a DBP solution flows from the lower part. A separation system for the mixture of ethanol, diphenyl carbonate and diphenylcarbonate is used for achieving the method. The method is simple to operate, finishes thorough separation at a relatively low temperature, the main contents of separated DPC and ethanol reach 98.5% orhigher, the main contents of DBP also reach 97.0% or higher, a recycling demand is met, material waste is avoided, the cost is reduced, and the environment is protected.

The invention belongs to the field of chemical industry, and particularly relates to a preparation method of high-content pentaerythritol tetra (3-mercaptopropionic acid) ester, and the method comprises the following steps: reacting pentaerythritol, mercaptopropionic acid and an acylating reagent as raw material and organic alkali as a catalyst in a certain solvent at a certain temperature, and finally carrying out alkali washing, acid washing, water washing and negative pressure solvent recovery to obtain the target product. The preparation method disclosed by the invention has the advantagesof high reaction rate, low product chromaticity, small smell, high main content and the like.

The invention discloses a producing method of a phosphorus-calcium highly-water-soluble fertilizer and belongs to the technical field of fertilizers. The method includes steps of: a) adding a calcium-containing compound into a raw material that is wet-process phosphoric acid, reacting, filtering, adding a sulfide into the acid solution after filtration, reacting and filtering; b) subjecting the acid solution treated by the step a) and a raw material that is powdered rock phosphate to an acidolysis reaction, with the using amount of phosphoric acid being more than 500% of a theoretical reaction amount; c) thickening by maintaining the temperature of the slurry after acidolysis; d) transferring the supernatant liquid after thickening into a cooling and crystallizing tank, cooling and crystallizing, and performing solid liquid separation; e) adding water into filter residue of the step d) to prepare slurry, and thickening by maintaining the temperature; and f) transferring the supernatant liquid after thickening to a dryer having high-temperature air streams, and drying to obtain a product that is the phosphorus-calcium highly-water-soluble fertilizer. The method can control the content of water insoluble compounds of the product to be less than 3% and the main content to be higher than 98%, and is low in cost, high in phosphorus utilization rate and less in residue discharge.