91results about How to "Easy industrial operation" patented technology

The invention relates to a method for preparing cyclic carbonate by reacting normal pressure carbon dioxide with epoxide. Propylene carbonate or ethylene carbonate is prepared by reaction under normal pressure carbon dioxide by taking epoxypropane or ethylene oxide as a substrate, corresponding propylene carbonate or ethylene carbonate as a solvent and Salen-Zn and tetraethyl ammonium bromide as a dual component catalyst, wherein the Salen-Zn is bissalicylaldehyde ethylenediamine-Zn, salicyladehyde cyclohexanediamine-Zn or bis-salicylaldehyde o-phenylenediamine-Zn. The method provided by the invention has the advantages that the catalyst is convenient to prepare, low in cost and less in use level; by using the product as the solvent, posttreatment is convenient; the method is low in reaction pressure, great in rate, safe to operate and suitable for scaled industrial production.

The invention belongs to the technical field of energy, and discloses a gas hydrate accelerant and an application thereof in saline-water desalting and carbon dioxide capturing. The gas hydrate accelerant has active components including dynamic accelerants and thermodynamic accelerants, wherein the dynamic accelerants are more than one kind of amino acid; and the thermodynamic accelerants are more than one of tetrahydrofuran and cyclohexane. The gas hydrate accelerant can be applied to saline-water desalting and carbon dioxide capturing. According to the invention, the amino acid is used as the gas hydrate accelerant, which is nontoxic and harmless, so that induction time of hydrate can be effectively reduced, gas storage capacity and gas storage density of the hydrate can be improved, and seawater can be efficiently separated and desalted, and thus combined application of gas separation and seawater desalting is achieved; THF and the other hydrate are used as stabilizers, so that stability of the gas hydrate can be improved while the formation condition of the hydrate is reduced, and thus industrial operation is facilitated.

The invention relates to a preparation method of a liquid antioxidant 4,6-di(octylsulfanylmethyl) o-cresol. The preparation method comprises the following steps of: casting o-cresol, n-octyl mercaptan and paraformaldehyde in specified amount to a reaction kettle; adding a reaction solvent or then adding into water; casting a solid catalyst strong alkali and weak acid salt; then, starting stirring; continuously introducing or dropping an organic amine catalyst with a certain time; then, heating to reflux and performing reaction; after reaction, treating to obtain a product with high purity, less smell and low content of formaldehyde. The process is simple in industrial operation, low in cost and easy to realize. The yield based on o-cresol is greater than or equal to 98.0%, and the product obtained is approximately colorless. APHA is less than or equal to 10, and the product is transparent and the product purity is greater than or equal to 98.0%.

The invention discloses a method for separating MEOH-DMC (methanol-dimethyl carbonate) through vapor permeation, which belongs to the technical field of separation of methanol-dimethyl carbonate. The method comprises the following steps: firstly, with Na2O.n, SiO2, Al (OH)3 and Zn (OH) 2 as raw materials and a porous a-Al2O3 supporting membrane tube or a porous mullite membrane tube as a supporting membrane tube, preparing a NaY-Zn molecular sieve membrane through hydrothermal synthesis, and then, conveying MEOH-DMC saturated mixed vapor with temperature of 121-140 DEG C and pressure of 0.63-1.08 Mpa into a molecular sieve membrane separator equipped with the NaY-Zn molecular sieve membrane, and maintaining the vacuum absolute pressure of the permeation side of the molecular sieve membrane separator to 28-95 Kpa through a vacuumizing method, wherein the MEOH in the mixed vapor preferentially permeates through the molecular sieve membrane to be enriched on the permeation side of the membrane and is condensed into liquid under low vacuum degree, and the mixed vapor on the retentate side is further separated by multiple levels of serially connected molecular sieve membrane separators. The method disclosed by the invention can be used for effectively improving the separating performance of the MEOH-DMC and has the advantages of small investment, low operation cost and the like.

The invention discloses thermal spraying powder. Aluminum oxide or titanium dioxide is used, graphene is coated to make particles, thus the graphene is protected from being oxidized by a high temperature in the thermal spraying process, and the graphene in a thermal spraying coating to maximum extent. Ceramic powder is coated on the surface of the graphene to form graphene particles coated by theceramic powder, in the process of thermal spraying, the graphene is isolated from the high temperature through the ceramic powder, thus the graphene is not prone to being gasified and lost, a large amount of grahene remains in the coating after spraying, thus the prepared coating has the good self-lubricating effect, wear-resisting performance of the coating is improved, and application of the coating is broadened. The preparation method of the thermal spraying powder is simple, high in success rate and convenient to industrial operation.

The present invention discloses a new synthesis method of 3,4-dimethoxyphenylacetaldehyde, in which 3,4- dimethoxy- benzaldehyde is adopted as the raw material, and TEBA or TBAB adopted is adopted as the transfer catalyst in organic or mixed solvent under alkaline condition, Darzen's condensation reaction is carried out under the condition of the temperature controlled at 10 DEG C to 40 DEG C and the reaction is carried out with the duration roughly within 8 to 72 hours, then hydrolyzation and decarboxylation is carried out in the mixed solvent to obtain 3,4-dimethoxyphenylacetaldehyde. The present invention carries out Darzen's reaction with the phase-transfer catalysis, avoids the substances including expensive potassium tert-butoxide, flammable and explosive sodium, and virulent methyrl, and has a high yield of 3,4- dimethoxy- benzaldehyde with stable content, and simple industrial operation in favor of massive industrialized production.

The invention discloses a preparation method of 3', 4', 7-trihydroxy isoflavone (T1) and 4', 6, 7-trihydroxy isoflavone (T2). The T1 and T2 are used in military medicine Research. The present invention uses cheap and easy-to-get chemical raw materials: resorcinol and 3,4-dimethoxyphenylacetonitrile or 3,4-dimethoxyphenol and p-hydroxybenzonitrile as starting materials, and the improved Hoesch Reaction, carbo-increasing and ring-closing reaction and three-step reactions such as removing dimethyl protection, respectively obtained 3', 4', 7-trihydroxy isoflavone (T1) and 4', 6, 7-trihydroxy isoflavone (T2 ). The method has the characteristics of economy, high efficiency, environmental protection, industrialization and the like.

The invention discloses a method for preparing cyclic carbonate by converting carbon dioxide through a cobalt-based catalyst. According to the method, carbon dioxide and epoxide are utilized as raw materials, a conjugated cobalt porphyrin microporous polymer material is utilized as a heterogeneous catalyst, tetra n-butyl ammonium bromide is utilized as a cocatalyst, and high-efficiency and green catalysis is achieved to synthesize cyclic carbonate under normal temperature and normal pressure and without solvent. The method has the main advantages of simpleness in catalyst preparation method, low cost, high catalytic activity, stable structure performance, easiness in recycling, capability of being reutilized, moderate reaction conditions, quick speed, safety in operation and suitability for large-scale industrial production.

The invention claims a radiation modified soybean isolated protein/starch biodegradable plastic and a preparation method thereof, wherein the radiation modified soybean isolated protein/starch plastic is prepared by taking soybean isolated protein and starch as main materials and modifying the materials by ray radiation; when the biodegradable plastic is prepared, each material is mixed according to the following parts by weight: 85-95 parts of modified soybean isolated protein, 5-15 parts of modified starch, 1-3 parts of caprolactam, 10-20 parts of water and 10-25 parts of glycerol. The invention has the following advantages: the soybean isolated protein is modified by proper methanol or ethanol, so hydrophilic group in the protein is reduced and water resistance of the plastic is improved. Proper starch is taken as the filler, so that flexibility of the plastic is enhanced and cost is reduced to be suitable for industrial production. Meanwhile, by regulating content of the starch and irradiation dose, materials with different mechanical properties can be obtained, thereby obtaining high technology content and innovation. The preparation technology adopts a common plastic device and a method thereof, so the process is simple, and easy to operate. Furthermore, the radiation modified soybean isolated protein/starch plastic is formed by the modified soybean isolated protein and a plasticiser by hot pressing, so that the radiation modified soybean isolated protein/starch plastic, after being discarded, is very easy to decompose into carbon dioxide and water by microbe without environmental pollution. The soybean protein is an inexhaustible renewable resource.

The invention relates to a preparation method for wet copper slag formed pellets. The method comprises the steps that copper slag powder, carbon raw materials and limestone are mixed according to a mass ratio and stirring evenly to obtain a mixed material; a composite binder is added into the obtained mixed material for further mixing, and a composite material is obtained through even stirring; the obtained composite material is placed in a disc pelletizer for pelletizing, and wet pellets are obtained; and the obtained wet pellets are dried or aired, and the dry pellets are obtained. The composite binder is mainly composed of a low-priced organic binder, the adding amount is small, the low production cost is ensured, the ash content after roasting is relatively low, and impurities are not introduced excessively. A humate binder is used as a viscous colloidal substance and has the high viscidity and a certain carbon content, so that copper slag reduction is facilitated. The method is simple in industrial operation and low in energy consumption cost and facilitates industrial production.

The invention relates to a method for preparing 1,7-diazaspiro[4.5]decane and derivatives thereof, and mainly solves the technical problems that the synthetic route is long, the yield is low, an intermediate is difficult to purify, reaction conditions are rigorous, and mass production cannot be performed in the prior art. The method comprises the following steps of: performing Michael addition reaction on N-PG-3-nitropyridine serving as a raw material and acrylic ester or acrolein in alcoholic solution or acetonitrile to obtain N-PG-3-(3-nitropyridine-3-yl)propionate or N-PG-3-propanal-3-nitropyridine; adding a catalyst into the product in an organic solvent, and performing hydrogenation reduction ring-closing reaction to obtain 1,7-diaza-2-oxy-spiro[4.5]decane with a protective group or 1,7-diazaspiro[4.5]decane with a protective group; and adding a reducing agent into the 1,7-diaza-2-oxy-spiro[4.5]decane with the protective group in the organic solvent to obtain the 1,7-diazaspiro[4.5]decane with the protective group. The method has the advantages of a few reaction steps, high yield and mild conditions, and is a synthetic method with large-scale preparation value.

The invention provides a color protecting agent and method for fresh-cut rhizoma dioscoreae. The color protecting agent comprises L-ascorbic acid, citric acid and D-isoascorbic acid. The method includes: fast soaking the peeled, cleaned and sliced fresh rhizoma dioscoreae into the color protecting agent for color protecting, taking out, draining, wrapping with a fresh-keeping film, and preserving at 0-4 DEG C. The method has the advantages that enzyme activity can be inhibited effectively, browning of the fresh rhizoma dioscoreae can be well prevented, and the method is simple in process and easy in industrial operation.

The invention discloses a method for preparing cyclic carbonate by transforming carbon dioxide with an iron-based catalyst. The carbon dioxide and epoxide are taken as raw materials, a conjugated ferriporphyrin microporous polymer material is taken as a multiphase catalyst, and tetra-n-butylammonium bromide is taken as a co-catalyst to realize high-efficiency green catalytic synthesis of the cyclic carbonate under a normal-temperature, normal-pressure and solvent-free condition. The method has the major advantages of simple preparation method, low cost, high catalytic activity, stable structural performance, easiness in recycling and reusability of the catalyst, mild reaction conditions, high rate and safety in operation, and is suitable for large-scale industrial production.

The invention discloses a method for preparing cyclic carbonate by transforming a copper-based catalyst into carbon dioxide. Carbon dioxide and epoxide serve as raw materials, a conjugate copper porphyrin microporous polymer material serves as a heterogeneous catalyst, tetra-n-butylammonium bromide serves as a co-catalyst, and efficient green catalytic synthesis of cyclic carbonate is realized atnormal temperature and pressure in a solvent-free manner. The method mainly has the advantage that the catalyst is simple in preparation method, low in cost, high in catalytic activity, stable in structural performance, easy to recycle, reusable, mild in reaction condition, high in speed, safe to operate and applicable to large-scale industrial production.

Belonging to the drug synthesis field, the invention in particular relates to an improved preparation method of telavancin or a salt thereof. The preparation method adjusts the feeding sequence of Mannich reaction, controls the reaction temperature, greatly shortens the reaction time, and significantly reduces the content of bis-Mannich by-product. In addition, an intermediate compound III obtained by post-treatment with a low boiling point solvent is easy in industrial operation and has purity up to 95% or more.

The invention discloses a preparation method of cefmetazole sodium, comprising the following operation steps: (1) by taking 7-MAC as an initial material, reacting with cyano methylthio acetyl chloride, thus obtaining cefmetazole diphenylmethyl ester; (2) enabling the cefmetazole diphenylmethyl ester obtained in the step (1) to react in an alchlor-anisole system, thus obtaining an organic solution of cefmetazole acid; (3) preparing a sodium bicarbonate solution with the concentration being 5-20 weight percent, controlling the temperature to be -5 to 10 DEG C, adding the cefmetazole acid organic solution obtained in the step (2), stirring, controlling temperature, decoloring, filtering and freeze-drying, thus obtaining the cefmetazole sodium. According to the preparation method of the cefmetazole sodium, the obtained product has the advantages of high purity, low impurity content, good stability and the like, and is easy for industrial production, and anaphylaxis reducing and clinic application of a preparation are both obviously improved.