31results about How to "Easy purity" patented technology

The present invention discloses a biological method for preparing gamma-aminobutyric acid, including the steps of: preparing bacteria, producing gamma-aminobutyric acid, decoloring, conducting electrodialysis, preparing gamma-aminobutyric acid powder products or gamma-aminobutyric acid crystal products and the like. The present invention utilizes the free lactic acid bacterium cells for catalyzed synthesis of gamma-aminobutyric acid, and helps to improve the production technology, improve the gamma-aminobutyric acid yield, and reduce the cost, and also establishes the method for preparation of high-purity gamma-aminobutyric acid. The reaction system of the present method does not include carbon sources, nitrogen sources and other culture components, and the reaction liquid components are simple relative to fermentation liquid. The biological method can greatly improve the purity of the product, and has the advantages of simple post-treatment, short production cycle, little environmental pollution, low cost, etc.

The invention discloses a preparation of secoisolariciresinol diglucoside, including steps of: ethanol extracting flaxseed meal in a soxhlet extraction device, wherein concentrated solution is obtained by decompress concentrating the extract; edulcorating the extract by acid precipitation and centrifugation; obtaining crude product of secoisolariciresinol diglucoside by alkaline hydrolysis, regulating PH value of extract, decompress concentrating and drying subsequently; product of secoisolariciresinol diglucoside with high content of SDG is obtained by ethanol extracting the crude product. The inventive production process is simple, easy to industrialize, totally avoid using toxic organic solution, and avoid using separation medium such as silica gel, macroporous resin, gelatin. The invention is capable of keeping effective elements of polyphenol in raw material, so as to ensure good medicine efficacy of subsequent product, while in favor of security of subsequent usage. The product can be used to improve osteoporosis, metabolism disorder of blood lipid, obesity, depression caused by women's climacteric syndrome, and to prevent and treat diseases related to heart, prostate, colonand kidney.

The present invention relates to a kind of preparation method of azoxystrobin intermediate, adopts the mode that adds catalyst to ring-opening, etherification reaction to efficiently synthesize azoxystrobin intermediate, specifically comprises the following steps: by methoxymethylene benzo Furanone and dichloropyrimidine were added into sodium methoxide / methanol solution in the presence of catalyst for ring opening and etherification reaction to synthesize azoxystrobin intermediate compound B. Compared with the prior art, the invention has the advantages of high efficiency, high yield and the like.

The invention relates to a method for propagating tuberose virus in vitro, which belongs to the technical field of plant virus propagation and comprises following steps: preparing culture medium, culturing tissues of a drug source tuberose, checking virus, and propagating the drug source tuberose virus in vitro. The method of the invention has the advantages that a plant tissue culture technique is utilized to propagate the tuberose virus in vitro, the tuberose virus can be propagated without limit, and the original infecting potential is maintained, which not only solves the problem that thedrug source is captured in imported virus disease quarantine, but also greatly simplifies the steps of propagation and drug source storage, the work for seeding differential hosts repeatedly, for reviving the drug source repeatedly, for transferring repeatedly, and for disinfecting soil before seeding to store some drug source is saved, the working efficiency is increased in times, and infectioustiter is easily extracted and prepared, which provides the virus with high purity for preparing virus detection antiserum.

The invention discloses a preparation method of a tetragonal-phase barium titanate (BaTiO3) hollow nanocrystal. The preparation method comprises the following steps of: using barium acetate and tetrabutyl titanate as raw materials, adding deionized water, adding potassium hydroxide of an appropriate amount to promote crystallization, and carrying out hydrothermal reaction at the temperature of 110-240 DEG C so as to prepare the tetragonal-phase barium titanate (BaTiO3) hollow nanocrystal. The preparation method is simple in technical process, easy in control, low in cost and easy in scale production. The prepared product is high in purity, good in crystallinity, good in dispersivity and narrow in particle size distribution. The product has wide application prospects in the fields of microelectronic devices, high-capacity capacitors, sensors, storage materials, piezoelectric ceramics, filters and the like.

The invention discloses a hyperbranched dispersant and a preparation method thereof. The present invention uses 1,3,5-trihydroxycyclohexane as the central atom (reactant) to prepare a hyperbranched dispersant with a large molecular weight, and the central atom used has the advantages of simple structure, simple production process, high purity and low cost , and the performance of the hyperbranched dispersant is excellent, specifically, the hyperbranched dispersant has good wettability and dispersibility to pigments, and is used in varnishes and white paints to make it have excellent color development and versatility, and The dispersant has good compatibility with various resins. The preparation method of the invention is simple, low in cost and suitable for popularization and application.

The present invention relates to a method for detecting residues on a component and particularly on the surface of the component. In order to also allow the testing of surfaces which are difficult to access, without the apparatus outlay growing, the method according to the present invention comprises the following steps:; producing a base solution (1) and a reference solution (2) from water, producing (3) a washing solution by adding fresh solvent to the base solution, filling (4) the component to be tested with the washing solution, wetting (5) the entire inner surface of the component with the washing solution, draining (6) the washing solution out of the component, producing (7) a test solution by adding the washing solution to the base solution, comparing (8) the test solution to the reference solution, and testing (9) whether a turbidity occurs in the mixing zone between the washing solution and the base solution, as proof (10a, 10b) for lubricant on the surface of the component.

The invention relates to a safe and reliable method for preparing lithium hexafluorophosphate by using a composite solvent. The technical steps of the method are simple. The method comprises steps that: anhydrous phosphoric acid, calcium fluoride and sulfur oxide are subject to a reaction, such that PF5 gas is obtained by evaporation; the evaporated PF5 gas is dehydrated, such that a high-purity anhydrous PF5 product is obtained; diethyl ether and anhydrous methyl cyanide are respectively dehydrated, such that high-purity diethyl ether and anhydrous methyl cyanide are obtained; high-purity lithium fluoride is added to the diethyl ether solution; methyl cyanide is added to the obtained solution; the PF5 gas is slowly delivered into the solution while stirring; when a reaction is finished, high-purity nitrogen is delivered into the solution, such that displacement is carried out until no PF5 gas is remained in a vessel; a dry product Li(CH3CN)4PF6 obtained through distillation is heatedand decomposed, such that LiPF6 is prepared; LiPF6 is dissolved under room temperature, such that a solution with a concentration of 1M is obtained; the solution is filtered by using a precise filterwith a specification of 0.2mum, such that a clarified solution is obtained; the solution is dried, such that a pure LiPF6 product is obtained.

The object of the present invention is to provide a production method wherein synthesis of a cyclic organic silicon compound similar to oxa-silacyclopentanes is completed in a single-step reaction. It is also to provide an organic silicon resin having an alcoholic hydroxyl group, which is capable of easily controlling its construction and is longitudinally stable.The means for solving is to produce the cyclic organic silicon compound represented by the formula (3) below by reacting an olefin represented by the formula (1) below and an alkoxysilane represented by the formula (2) below in the presence of a catalyst comprising a transition metal.(In the formula, Z is alkenyl group having carbon atoms from 2 to 5 where the terminal carbon atom forms a C═C bond, R is methyl group or hydrogen atom, and Me is methyl group.)(In the formula, R1 is alkyl group or alkoxyl group, having carbon atoms from 1 to 3, and R2 is alkyl group having carbon atoms from 1 to 3.)(In the formula, Z′ is alkylene group having carbon atoms from 2 to 5.)And it is an organic silicon resin having an alcoholic hydroxyl group obtained by performing hydrolysis and condensation of a cyclic organic silicon compound represented by the formula (3) above, or of a mixture of this and a polyfunctional alkoxysilane.

The invention discloses a preparation method for dihydrostreptomycin sulphate and belongs to the production preparation technology of semi-synthesis antibiotics. The method comprises the following steps: treating with acid; performing ion exchange; adsorbing with large-pore amino resin; hydrogenating; performing secondary ion exchange; purifying by a mixed bed; treating with activated carbon; concentrating through a nanofiltration membrane; decolorizing by activated carbon; and treating with an ultrafiltration membrane and performing spray drying. According to the invention, the dosage of oxalic acid in a preparation process is reduced, the use ratio of the reducing agent is increased, the production cost is lowered, the production efficiency is increased, the method can meet the industrial production requirement and the product purity, quality yield and total recovery of the dihydrostreptomycin sulphate are increased.

The invention discloses a preparation method of p-aminophenylacetic acid. The method comprises the following steps: uniformly mixing water, iron chloride and p-aminophenylacetic acid, heating the materials to the temperature of 60-90 DEG C under nitrogen atmosphere, dropping a hydrazine hydrate aqueous solution, insulating for 1-2 hours, cooling the material for crystallization, filtering the material to take a filter cake, washing the filter cake, and drying the product to obtain p-aminophenylacetic acid. According to the method, a difficulty processed solid waste is not generated, an organic solvent is not required, the environment is protected, the reaction condition is mild, operation is simple, and the method is suitable for industrial production, yield is high, the purity of the prepared p-aminophenylacetic acid is good, and the method provides the help for normal and stable production for actarit.

The invention relates to a high-purity sodium rabeprazole compound, belonging to the technical field of medicine. The method includes the following steps: dissolving crude sodium rabeprazole synthesized by the reaction of rabeprazole and sodium hydroxide in water, adjusting pH value to be faintly acid to neutral by using solid acid salt, and collecting precipitated solid; after dissolving the solid with organic solvent, conducting elution and purification by using eluting agent through macroporous adsorption resin, and collecting eluent; and adjusting the pH value of the eluent to be alkaline, and collecting the precipitated solid to obtain the pure sodium rabeprazole.