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47results about How to "Strong selectivity" patented technology

Process for extracting squalene by complex

The invention discloses a process for extracting squalene by complex. The process comprises the following steps of crushing seeds of tea-oil tree, adding petroleum ether, carrying out ultrasonic extraction, filtering, concentrating the filtrate under reduced pressure to obtain a camellia oil fat-soluble substance concentrate; mixing camellia oil fat-soluble substance concentrate with an alcoholic solution of a strong base, heating in a water bath, stirring, refluxing and extracting squalene with petroleum ether to obtain squalene crude product; adding a methanol aqueous solution of silver nitrate into the squalene crude product, under the conditions of oscillation or stirring, carrying out complexation reaction at a low temperature, standing at a low temperature and carrying out liquid separation to obtain an aqueous solution of silver ions-squalene complex as an intermediate product; adding petroleum ether into the aqueous solution of silver ions-squalene complex, heating under reflux, carrying out reverse extraction and then standing and carrying out liquid separation to obtain a dissociated squalene petroleum ether organic phase; cleaning the dissociated squalene petroleum ether organic phase with an aqueous NaCl solution, and then distilling under reduced pressure to recover the organic solvent; cleaning with distilled water again and carrying out vacuum drying to obtain the final product refined squalene.
Owner:NANJING UNIV OF TECH

Macroporous adsorption resin preparation method

The invention relates to a macroporous adsorption resin preparation method, which comprises: preparing a monomer: pouring divinylbenzene, methyl acrylate and dibenzoyl peroxide into a reaction kettle according to a formula, carrying out room temperature stirring for 25-30 min, pouring a pore forming agent cyclohexane, and carrying out room temperature stirring for 25-30 min; preparing a water phase: adding a proper amount of water to the reaction kettle, pouring a powder salt, and stirring to make the salt water achieve a uniform state; pouring gelatin and methylene blue, stirring while heating to a temperature of 55-60 DEG C, and turning off the stirring in advance; sucking the prepared monomer into the reaction kettle, and carrying out heating-free empty stirring for 10-15 min, wherein the temperature of the water phase at the beginning is 55-60 DEG C, and the temperature in the reaction kettle is about 40-45 DEG C after the monomer is poured; slowly heating to a temperature of 68-70 DEG C after the empty stirring is performed for 10-15 min; and carrying out thermal insulation for 4-5 h, carrying out steam heating to slowly increase the temperature to 70-75 DEG C, and carrying out thermal insulation for 6-7 h, wherein the stirring is not turned off during the operation.
Owner:JIANGSU STEVEN BIOTECHNOLOGY CO LTD

Steel plate for acetabulum

The invention belongs to the technical field of medical instruments, and particularly relates to an anatomic steel plate for acetabulum, which consists of a plate body and two end wings. The plate body is in the shape of a 'top hat', the middle arch has a radian and is matched with the anatomic shape of the acetabulum, and the two end wings are tilted slightly so as to be matched with the anatomic shape of the nodule extension positions between the acetabulum and the upper ilium bone and between the acetabulum and the lower ischium. The plate body of the steel plate is uneven in width, and at the joints of the sides of the plate body with the edge of a back wall of the acetabulum, one side of the plate body contacts with the posterior column of the acetabulum, the middle of the plate body is in transition gradually, and the other side of the plate body contacts with the ilium. The integral design of the width of the plate body is consistent with variation of the thickness of the bone mass of the acetabulum, and the middle of the steel plate for the acetabulum is slightly wider than the two end wings, and is provided with multi-angle lock screw holes, dual-purpose screw holes and Kirschner wire holes. The anatomic steel plate for the acetabulum can be used after being adjusted slightly according to fracture condition during surgery, is fit with local bone mass well, free of forming larger slots and capable of preventing screws entering an articular cavity when in implanting of the screws.
Owner:谢友军

Compound amine absorbent for absorbing sulfur dioxide and preparation method thereof

The invention provides a composite amine absorbent for absorbing sulfur dioxide and a preparation method thereof, belonging to the field of gas purification and recovery, and the composite amine absorbent comprises the following components in percentage by mass: 30-50% of piperazine and derivatives thereof, 0.5-10% of an activator, 1-5% of a pH corrosion inhibiting solution, 0.1-0.5% of a defoaming agent and the balance of water. The preparation method comprises the following steps of: adding the piperazine and derivatives thereof, the activator, the pH corrosion inhibitor and the defoaming agent into the water according to a certain proportion, dissolving and stirring uniformly. The composite amine for absorbing the sulfur dioxide gas adopts the piperazine as an absorbent main body, and has the characteristics of low viscosity and strong sulfur dioxide absorption selectivity; the saturated absorption capacity can reach 2.6 mol/mol of amine, and the composite amine absorbent has a highdesorption capacity of 1.53 mol/mol. Compared with that of absorption solutions commonly used in industry, the desorption capacity of the composite amine absorbent after multiple absorption can stillreach more than 98%. In addition, the composite amine absorbent is added with a pH slow release liquid to reduce the corrosivity of the amine absorbent to equipment.
Owner:西安悟能环境工程有限公司

High-Q cross-coupled slot waveguide microwave filter

The invention relates to a high-Q cross-coupled slot waveguide microwave filter, comprising a rectangular metal bottom plate, a plurality of metal stand columns, a metal square column and a metal topplate; the metal stand columns are positioned on the metal bottom plate, the metal square column is used for supporting the structure, an air gap is reserved between the metal stand column and the metal top plate and constitutes an electromagnetic band gap structure together with the metal stand columns, the metal bottom plate and the metal top plate, the metal stand columns together with the metal bottom plate and the metal top plate forms five cuboid cavities, five resonant cavities are formed, two rows of metal stand columns are arranged between the adjacent resonant cavities and are used for energy coupling between the adjacent resonant cavities, metal round columns are respectively arranged at the centers of the first cavity, the second cavity, the third cavity and the fifth cavity onthe metal bottom plate, two metal circular holes are formed in the metal top plate right above the first cavity and the fifth cavity, the two metal circular holes are arranged as two feeding ports, and the two feeding ports are used for feeding the filter from the top side through a coaxial probe. The filter has a relatively high load-free quality factor; and meanwhile, the filter has the characteristic of being higher in selectivity.
Owner:广东昌宝科技股份有限公司

Coking slop oil tank waste gas deodorization purifying device based on chemical absorption method

The invention discloses a coking slop oil tank waste gas deodorization purifying device based on a chemical absorption method. The coking slop oil tank waste gas deodorization purifying device comprises a sewage tank, a coking slop oil tank, a buffer tank, a first ejector, an absorption agent circulating pipe, an air guide pipe, a first circulating tank, a pump I, a spraying head, a first absorption tower, a second absorption tower, a second ejector, a second circulating tank, a pump II and an exhaust cylinder, wherein waste gas of the coking slop oil tank and the sewage tank are concentrated to be guided out, and a great amount of oil gas and vapor, which are likely to condensate, are separated by virtue of the buffer tank, and then enter the absorption tower. Secondary cyclone plate towers are connected in series for the circular absorption, the secondary parallel-connection ejectors are installed in front of and behind the absorption towers to be used as power for guiding the gas, then an absorption agent and the waste gas are adequately mixed and absorbed again in the ejectors, and after the gas-liquid separation in the absorption agent circulating tank, the mixed liquid enters the exhaust cylinder to be discharged. The coking slop oil tank waste gas deodorization purifying device is a special petrochemical waste gas purifying device based on the chemical absorption method and has advantages of high reaction speed, high selectivity, good absorption effect, simple process, convenience in operation, safety, reliability and the like.
Owner:上海景凯环保科技有限公司

Ion chromatography-online pretreatment analysis system for determining heavy metal chromium (VI) in donkey-hide gelatin

ActiveCN103091414AStrong selectivityReduced sample preparation processComponent separationChromatographic columnIon exchange
The invention relates to a use system of chemical apparatus analysis, and particularly to an ion chromatography-online pretreatment analysis system for determining heavy metal chromium (VI) in donkey-hide gelatin. A simply processed donkey-hide gelatin sample passes through a polymer reversed-phase column, interfering substances in the donkey-hide gelatin are removed online under an alkali condition, then the processed sample solution is enriched in an enriching pipe by an ion chromatography-valve switching technology and is separated through an anion exchange chromatographic column, and then post-column derivatization visible light detection is carried out. As the ion chromatography-online pretreatment analysis system adopts an ion chromatography-online pretreatment analysis technology, fussy sample pre-treatment processes can be reduced and even omitted, the sample analysis time is shortened, and the detection efficiency is enhanced. By virtue of the post-column derivatization visible light detection, no other interfering ions appear and the selectivity is good. The ion chromatography-online pretreatment analysis system can be suitable for a series of other problems of separation and detection on ions in complex matrixes, and has a high practical value.
Owner:ZHEJIANG UNIV +1
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