33results about How to "Long synthesis time" patented technology

The invention relates to a lithium-enriched manganese-based material precursor which is a lithium-enriched manganese-based carbonate precursor of a lamellar morphology, the particle size of the precursor is 1-7mu m, and the specific surface area of the precursor is 8-50m<2>/g. By adopting the lithium-enriched manganese-based carbonate precursor of the lamellar morphology, a lithium-enriched manganese-based anode material of a high single crystallization degree can be easily prepared. The invention further relates to a preparation method of the lithium-enriched manganese-based carbonate precursor of the lamellar morphology, and a preparation method and the application of the lithium-enriched manganese-based anode material of a single crystal morphology. Therefore, the mechanical strength, the stability, the compaction density, the capacity and the first efficiency of the micro structure of the anode material can be improved, and the voltage attenuation of the material can be inhibited.

The invention discloses a preparation method of branched polyethyleneimine and a shale intercalation inhibitor prepared from the branched polyethyleneimine. The branched polyethyleneimine is preparedby the following steps: S1. synthesizing aziridine; S2. with a polyamine compound and the aziridine as raw materials, preparing the branched polyethyleneimine by a stepwise synthesis process or a one-pot synthesis process, wherein the polyamine compound is polyethylene polyamine or alkylamine; the polyethylene polyamine is one of diethylenetriamine, triethylene tetramine, tetraethylenepentamine and pentaethylenehexamine; the alkylamine is one of ethylenediamine, propane diamine, butanediamine, pentamethylene diamine, nonamethylene diamine and decamethylene diamine. The shale intercalation inhibitor is prepared by proportionally mixing the branched polyethyleneimine with water. The branched polyethyleneimine synthesis method provided by the invention has the advantages of high yield and cheap raw materials and is suitable for large-scale industrial production; the shale intercalation inhibitor prepared from the branched polyethyleneimine can effectively alleviate the problem of unstableborehole wall caused by the hydration dispersion of shale.

The invention discloses a method for preparing a highly-oriented MFI-type molecular sieve membrane by a secondary growth process, which comprises the following steps: 1) preparation of a secondary growth synthesis liquid: mixing certain amounts of ethyl orthosilicate, tetrapropyl ammonium hydroxide and water, stirring at room temperature for 3-5 hours, adding an ammonium salt water solution with a certain concentration into the clear synthesis liquid, and continuing stirring for 1-3 hours to obtain the final synthesis liquid, wherein the synthesis liquid is composed of the following components in parts by mole: 1 part of ethyl orthosilicate, 0.1-0.4 part of tetrapropyl ammonium hydroxide, 100-500 parts of water and 0.075-0.3 part of water; 2) putting a carrier coated with a b-axis-oriented crystal seed layer into a high-pressure synthesis kettle, pouring the synthesis liquid, and sealing; crystallizing at 120-180 DEG C for 3-12 hours; and 3) cooling the synthesis kettle, taking out the carrier, washing and drying to obtain the oriented MFI-type molecular sieve membrane on the carrier. The ammonium salt added into the traditional synthesis liquid can effectively inhibit the twin crystal from generation in the secondary growth process. The method is simple to operate, and has the advantages of wide application range, no special requirements for the carrier and low preparation cost.

The invention discloses a temperature stabilizing and humidity reducing dense flue-cured tobacco curing method. The dense flue-cured tobacco curing method comprises a temperature stabilizing and humidity reducing yellowing stage, a temperature stabilizing and humidity reducing color fixing stage and a temperature stabilizing and humidity reducing killing-out stage. The method disclosed by the invention can reduce a wet bulb temperature step by step by stabilizing tobacco leaf yellowing, color fixing and killing-out appropriate temperatures, so that a curing target of mutual coordination between tobacco leaf yellowing and water loss, between color fixing and aroma enhancement and between killing-out and aroma maintenance is achieved in a curing process; a yellow flue-cured tobacco rate is improved to a greater extent, and tobacco leaf quality is improved. The method disclosed by the invention has the advantages of simpleness and easiness in operation control.

The invention provides an underlayment used for diamond synthesis and having a coating layer as well as a diamond synthesis system. The substrate is used to place seed crystals for diamond synthesis and at least comprises one sample mounting surface, a plurality of seed crystal mounting grooves are formed in each sample mounting surface, the roughness of each sample mounting surface is larger thanthat of the bottom surfaces of the seed crystal mounting grooves. aiming at the problems of diamond fixation and polycrystalline growth in diamond mass production in the prior art, a film is uniformly plated on the surface of the substrate to roughen the plating surface, so that purposes of fixation of diamond seed crystals, batch fixation and inhabitation of polycrystalline growth can be achieved. The invention also provides a diamond synthesis system which comprises a microwave source, a microwave coupling system, a reaction chamber with an air inlet system and an air outlet system, a vacuum system connected to the reaction chamber, a substrate located in the reaction chamber, wherein the substrate at least comprises one sample mounting surface, the plurality of seed crystal mounting grooves are formed in the surface of each sample mounting surface, and the roughness of each sample mounting surface is larger than that of the bottom surfaces of the seed crystal mounting grooves.

The invention discloses a method for producing phospholipase D through recombinant escherichia coli. According to the method, a phospholipase D gene is in preciseness-type starting sub control, a pararea of pSC101 is inserted in an expression plasmid, an escherichia coli mutant strain recA is used for keeping the genetic stability of the plasmid, cells containing the plasmid at the growth periodare cultured to high density, and saturation induction is conducted at the induction period; meanwhile, the temperature is decreased, alkali metal salt stress is applied, the cytotoxicity of PLD to ahost is reduced, cell lysis is inhibited, the synthesis time of PLD is prolonged, and accordingly PLD expression is improved.

A method for preparing the precursor of the anode material for a lithium battery is characterized in that the preparation process comprises the steps of preparing a metal salt solution with the total metal ion concentration of 0.1 to 3mol/L according to the stoichiometric proportion of corresponding metal salts and the prepared precursor composite hydroxid; adding a sodium hydroxide solution with the concentration of 0.1 to 5mol/L to the metal salt solution; and reacting under the condition of inert gases to obtain the precursor composite hydroxid. The protection by the inert gases effectively prevents the oxidation of Mn and the generation of Alpha type hydrous hydroxide, so as to prepare the pure phase composite hydroxid precursor with the Beta-Ni(OH)2 type structure. The precursor has evenly distributed elements, good electrochemical activity and is favorable for preparing high-performance anode materials.

The invention provides silicon iron nitride microwave-synthesizing method, using silicon iron as raw material for microwave synthesis, grinding silicon iron ore into powder with particle size smaller than 0.5mm, placing the silicon iron powder into a microwave synthesis reaction cavity, adding ammonium-containing additive by 5% of the raw material, uniformly mixing, where microwave frequency is 300MHz-300GHz, pressure is 0.1-0.12MPa and synthesis temperature is 800-1800 deg.C, inputting nitrogen gas for microwave synthesis for 0.5-3 hours, and cooling the synthetic to obtain the finished product silicon iron nitride. The invention couples special wave band of the microwave with basic structure of the material to produce heat to heat in a mode of heating the material by its medium loss, and has the advantages of low synthesis temperature, short synthesis time, low energy consumption, etc.

The invention discloses a microwave preparation method of high-quality aluminum nitride powder. The microwave preparation method comprises the following steps of: mixing an aluminum source with a carbon source in a C/AL molar ratio of (3-6):1; adding calcium carbonate with an Al/Ca molar ratio of 100:(1-5) for uniformly mixing; carrying out microwave synthesis in a microwave reaction device under a nitrogen-containing atmosphere, wherein the heating rate for the microwave synthesis is 3 DEG C/min-20 DEG C/min, the temperature is 1200 DEG C-1600 DEG C, and the thermal insulation time is 0-10 hours; and cooling the obtained product to obtain the high-quality finished product aluminum nitride powder. Different from a conventional heating way by convection, conduction or radiation, the microwave preparation method is used for generating heat by coupling a special wave band of the microwave with a base structure of the material, and used for heating in an integral material heating way by virtue of medium loss of the material; moreover, the microwave preparation method of the high-quality aluminum nitride powder has the advantages of good synthesis quality, low synthesis temperature, short synthesis time, low synthesis energy consumption and the like.

The invention discloses a preparation method of rare earth element-doped cobaltosic oxide. The method comprises the following steps: rear earth element is added into a cobalt solution; with the extension of synthetic time, concentration gradient of the cobalt solution added to a reaction kettle increases or decreases; simultaneously, solid-to-liquid ratio of slurry in the reaction kettle is adjusted, and cobalt hydroxide with uniform doping is synthesized by a wet method; after the synthesis, the synthetic product is washed, dried and calcined to obtain a large granular or small granular rareearth element-doped cobaltosic oxide product.

The invention relates to a microwave synthesis method for aluminum nitride powder. In the method, microwave synthesis is performed by using aluminum powder as a raw material and comprises the following steps of: thoroughly and uniformly mixing the aluminum powder with particle size smaller than 0.5 millimeters and ammonium salt according to a proportion; placing the mixture according to a figure 1 and putting the mixture into a microwave synthesis reaction cavity, wherein the microwave frequency is 2, 450 MHz, the pressure is the normal pressure and the synthesis temperature is between 600 DEG C and 1,300 DEG C; introducing nitrogen-containing atmosphere for microwave synthesis; keeping the temperature for 0 to 5 hours; and cooling the synthesized product to obtain the finished product of the aluminum nitride powder. In the microwave synthesis method, heat is generated by coupling a special wave band of the microwave and a basic structure of the material and the dielectric loss of the material makes the material heated in an integral heating way which is different from the conventional heating way through convection, conduction or radiation; and the method has the advantages of low synthesis temperature, short synthesis time, low energy consumption of synthesis, high yield, high product performance, simple process and the like and can realize large-scale industrial production.

The invention discloses a construction method of an anti-apoptosis CHO-K1 cell line capable of improving expression level by combining with valproic acid. The construction method comprises the following steps: firstly, respectively designing out corresponding sgRNA sequences on exons of BAK and a BAX genes; secondly, preparing PSK-sgRNA-BAK and PSK-sgRNA-BAX plasmids; thirdly, transfecting the plasmids into CHO-K1 cells and then screening and selecting monoclone to obtain different cell lines; fourthly, carrying out Western Blot detection; fifthly, carrying out functional identification and verification; sixthly, jointly using an exogenous protein expression cell line constructed by knockout cell lines and the valproic acid to further improve the expression level of the exogenous protein. According to the stable cell line prepared by the method disclosed by the invention, synthetic time of recombinant protein of the stable cell line can be prolonged and more recombinant proteins are obtained.

The invention discloses special peptone for producing inosine through fermentation as well as a preparation method and application of the peptone, belonging to the field of peptone preparation. The preparation method for special peptone used for producing inosine through fermentation comprises the following steps: (1) adding various enzymes into fishbone soup to obtain a concentrated fishbone peptone solution; (2) adding various enzymes into a bovine bone soup to obtain a concentrated bovine bone peptone solution; (3) adding various enzymes into a soybean meal filtrate to obtain a concentrated soybean meal peptone solution; and (4) mixing the above three concentrated solutions in proportion, and conducting drying into powder to obtain the special peptone for fermentation production of inosine. The peptone prepared by the method is reasonable in molecular weight distribution, effectively controls a strain fermentation metabolism speed while promoting mass propagation and growth of strains, prolongs inosine synthesis time, increases inosine yield, and lays an important foundation for large-scale inosine fermentation production.

The invention provides a single crystal nickel cobalt lithium manganate precursor and a preparation method and application thereof. The preparation method comprises the following steps: dissolving soluble nickel salt, cobalt slat, manganese salt and/or salt doped with metal ions M in deionized water to obtain a mixed salt solution; mixing the salt solution with a carbonate solution and feeding thesolutions in parallel to a reaction kettle where a surfactant is dispersed to be stirred and reacted; and then carrying out centrifugalization, washing and drying to obtain the single crystal nickelcobalt lithium manganate precursor. The chemical formula of the single crystal nickel cobalt lithium manganate precursor is NixCoyMnzM(1-x-y-z)CO3, wherein M is the doped metal ions, x is greater than0 but less than 0.8, y is greater than 0 but less than 0.4, z is greater than 0 but less than 0.4 and (1-x-y-z) is greater than or equal to 0 but less than or equal to 0.1. The preparation process issimple to operate, free of an inert atmosphere or an additive, continuous to prepare and easy to implement industrial production.

The invention discloses a synthesis process of disc-shaped contact agent for high-abrasion-resistance artificial diamond. The synthesis process comprises two heating hammers (1) of which chambers axially correspond and four non-heating hammers (2) which radially correspond, wherein the alpha angles of the two heating hammers (1) is 42 degrees; A-A surfaces of the four non-heating hammers are 40 degrees 30 minutes; the B-B surfaces of the four non-heating hammers are 41 degrees 30 minutes; namely, the four non-heating hammers (2) are adjacent in 41 degrees 30 minutes; and the two heating hammers (1) and the four non-heating hammers (2) are adjacent in 42 degrees to 40 degrees 30 minutes. The invention discloses the synthesis process of the disc-shaped contact agent for the high-abrasion-resistance artificial diamond which is coarse in granularity, high in transparence, sharp in edge, and low in magnetic susceptibility.