37results about How to "Eliminate the refining process" patented technology

The invention relates to a preparation method of methyl-glycine diacetate tri-sodium, successively comprising the following steps of: preparation of hydroxy acetonitrile solution, preparation of iminodiacetonitrile solution, preparation of methyl-flycine nitrile diacetonitrile crystal, preparation of methyl-glycine diacetate tri-sodium (MGDA-3Na) and preparation of solid product MGDA-3Na. In the method, the yield of methyl-flycine nitrile diacetonitrile crystal is higher than 92%, the total yield of MGDA-3Na can reach more than 86%, the content of NTA (nitrilotriacetic acid) is less than 0.08%; and the equipment investment and energy consumption in the hydrocyanic acid refining process are saved on the premise that high yield and low toxic side product content are met, and the hydrocyanic acid refining process is not required, so that the production cost is reduced and the environment pollution is reduced.

The invention discloses a smelting production method of a titanium microalloyed low-cost Q355B steel plate. The method comprises the steps of 1, acquiring raw materials, specifically, low-sulfur and low-phosphorus molten iron is slected; 2, smelting through a converter, specifically, deep dephosphorization is carried out by adopting a double slag smelting process; 3, tapping, specifically, any point blowing operations are avoided at the smelting end point, a silicon-manganese alloy is added for deoxidation during the tapping process, and the slag thickness in a molten steel tank is less than or equal to 40 mm after tapping; 4, carrying out argon station treatment, specifically, after molten steel reaches an argon station, argon bottom blowing is kept, an aluminum wire is fed immediately, the Als content in the molten steel is 0.020%-0.040% after the aluminum wire is fed, argon soft blowing is kept for 2-3 minutes, the fine adjustment of the alloy is completed during the period of the argon soft blowing, and then a titanium silicon calcium composite core wire is immediately fed; and 5, continuous casting to carry out protective pouring in the whole process to ensure the Als loss less than or equal to 0.003%. According to the method, titanium microalloying is adopted, and thus, the production cost of Q355B is reduced, and the purity of the molten steel is improved.

The invention discloses a method for synthesizing 1,4-dioxane-2-ketone by ethylene glycol. The method comprises the following steps of: 1, synthesis of ethylene glycol monosodium: mixing a dehydrating agent, ethylene glycol and sodium hydroxide for reaction, cooling down the mixed solution to the room temperature after reaction, standing the mixed solution for demixing to obtain upper-layer liquid, and directly using the upper-layer liquid in the next reaction, wherein the ethylene glycol mixed in the lower-layer ethylene glycol monosodium is unnecessarily separated; 2, synthesis of beta-hydroxyethoxy sodium acetate: mixing ethylene glycol, sodium monochloroacetate and ethylene glycol monosodium for reaction, adding sulfolane to the mixed solution after reaction, recovering ethylene glycol by vacuum distillation, cooling down the mixed solution, then adding acetone to the mixed solution, and obtaining a coarse product of beta-hydroxyethoxy sodium acetate; and 3, synthesis of 1,4-dioxane-2-ketone by ethylene glycol: adding beta-hydroxyethoxy sodium acetate to an oxygen heterocycle containing solvent, slowly adding concentrated sulfuric acid to the mixed solution dropwise when the mixed solution is stirred, and obtaining the finished product of 1,4-dioxane-2-ketone by ethylene glycol. The method takes ethylene glycol as a synthetic raw material, the products are easily separated, and the selectivity is high; and the solvents used in the reaction can be recovered in high efficiency for reutilization, so that the method is environment friendly.

The invention provides an R-(-)-atomoxetine hydrochloride preparation method, which comprises: preparing 3-methylamino-1-phenyl-1-propanol by using 1-phenyl-2-propenyl-1-one as a starting raw material, carrying out etherification on the 3-methylamino-1-phenyl-1-propanol and o-halo toluene in an inorganic alkali environment, splitting with L-(+)-mandelic acid to obtain R-(-)-tomoxetine-S-(+)-mandelate, refining the R-(-)-tomoxetine-S-(+)-mandelate, and carrying out hydrochloride forming to obtain the R-(-)-atomoxetine hydrochloride. According to the present invention, the method eliminates theoxalate refining step so as to reduce the reaction step, has advantages of cheap and easily available raw materials, less side reactions, low toxicity of the reaction solvent, high yield, high purity,low cost and the like, and is suitable for industrial production.

The invention provides a cast high chrome iron or cast high chrome steel roller used to roll weld steel tube and on straight-slim welding steel tube roller, or the like, wherein the cast high chrome iron roller comprises C in 1.8-2.8%, Si <=1.0%, Mn <=1.0%, P<=0.05%, S<=0.05%, Cr in 12-22%, Ni in 0.5-3.0%, Mo in 0. 0%, Ti in 0-0.3%, V in 0-1.0%, Cu in 0-1.0%, RE in 0.01-0.5%, and the left is Fe. The inventive roller has uniform organism, high abrasion resistance and flexibility, while its service life is 2-5 times of general product and material utilization can reach 70% or 80%, with low cost.

The invention relates to a composite solvent used for purifying acetylene in acetylene mixed gas prepared from hydrocarbon and a purification method of the composite solvent. High-purity acetylene and higher alkyne, which are obtained from the acetylene feed gas, can be used as chemical materials. The invention adopts the technical scheme that the components of the composite solvent are as follows in mass percentage: 70-85 percent of physical solvent, 10-20 percent of CO2-removing chemical assistant, 1-5 percent of polymerization inhibitor in an addictive, and 0.5-5 percent of corrosion inhibitor. A device used in the purification method consists of an absorption tower, three desorbers and accessory equipment; the feed gas is firstly in countercurrent contact with the composite solvent in the absorption tower, wherein the acetylene, the higher alkyne and CO2 are absorbed by the composite solvent, then the high-concentration acetylene is absorbed out in the first desorber, the residual acetylene is absorbed out in the second desorber, and the higher alkyne and the CO2 are absorbed out in the third desorber. The composite solvent is high in selectivity, excellent in stability and easy to regenerate; and the purification method is simple in flow and mild in operation conditions, and the acetylene product whose purity is higher than 99.5 percent can be obtained.

The present invention provides a purifying method for abiraterone acetate. According to the method, phosphoric acid is adopted as a salt forming reagent to react with a abiraterone acetate crude product to obtain a light yellow crystal, wherein the light yellow crystal is the abiraterone acetate phosphate, is easily filtered, and has the purity more than 98%, the abiraterone acetate phosphate can be used for the next reaction without further purification to prepare the abiraterone acetate, and the purity of the abiraterone acetate prepared by freeing can be more than 98%; the purification process is simplified, the production cost is reduced, and the method is suitable for industrial production.

The invention discloses a method for continuously preparing 2,3,5-trimethylquinone. The method comprises a reaction process, an oil phase refining process and a water phase refining process. The reaction process comprises the following steps: a reaction raw material and a catalyst are in oxidizing reaction in a packed bed oscillatory flow reactor to obtain an oil phase and a water phase mainly comprising 2,3,5-trimethylquinone; the oil phase refining process comprises the following steps: the oil phase after the reaction passes through an oil phase desalting extracting tower and a gas stripping light component removal tower and then passes through a decompression rectifying tower to obtain a 2,3,5-trimethylquinone product at the tower top; the water phase refining process comprises the following steps: a water phase material sequentially passes through a dealcoholization rectifying tower, a recycling extracting tower and a cyclohexane rectifying tower to obtain 2,3,5-trimethylquinone. With adoption of the method, the continuity of reaction and separation process of 2,3,6-trimethylphenol is realized, and the problems that the production efficiency is low, the operating strength is high, the product quality is not stable, and the process potential safety hazard is large are solved.