15results about How to "The post-processing process is simple" patented technology

The invention belongs to the field of electronic materials, and particularly relates to a synthesis method of a high-purity metal complex precursor. Compared with a synthesis method in the prior art, the synthesis method provided by the invention changes a reaction route, substituted cyclopentadiene is prepared firstly, then the substituted cyclopentadiene reacts with butyl lithium and metal chloride in sequence to obtain a substituted cyclopentadienyl metal trichloride intermediate, and finally the substituted cyclopentadienyl metal trichloride intermediate reacts with lithium dialkylamino to obtain the substituted cyclopentadienyl metal trichloride. The target product substituted cyclopentadienyl tri (dialkylamino) metal complex is obtained, and the prepared product is high in yield and purity. The synthesis method provided by the invention is convenient for large-scale production in factories, improves the productivity, and meets the ever-increasing market demand.

The invention provides a preparation method of a ZSM-22 molecular sieve. The preparation method of the ZSM-22 molecular sieve comprises the following steps: uniformly mixing an aluminum source, an alkali source, water, an organic template agent and a silicon source to obtain a gel mixed solution; at least crystallizing and roasting the gel mixed solution to obtain a ZSM-22 molecular sieve; wherein the organic template agent comprises an alcohol amine compound with the carbon number of 5-6. According to the preparation method of the ZSM-22 molecular sieve, the low-cost organic template agent is adopted, and the pure-phase ZSM-22 molecular sieve can be prepared.

The invention relates to a first-generation Grubbs catalyst preparation method, which comprises: mixing a ruthenium-indenylene compound, a transition metal salt and a solvent, carrying out heating treatment, adding styrene in batches, and carrying out an olefin exchange reaction; and carrying out solid-liquid separation on the obtained product, and carrying out post-treatment on the obtained liquid phase to obtain the first-generation Grubbs catalyst. The transition metal salt is added as the catalyst, and styrene is added in batches, so that the use amount of styrene can be effectively reduced, the yield is improved, the post-treatment process is simple, and the method has a relatively good application prospect in the aspect of industrial amplification.

The invention discloses a radiation evaporation synergetic cooling structure integrated Janus fiber membrane and a preparation method thereof, a PET fiber membrane with good mechanical strength, toughness resistance and other performances is selected as a substrate fiber membrane, CaHPO4 is loaded on the surface of the PET fiber membrane, the PET fiber membrane is modified, the hydrophilic performance, sunlight reflectivity and infrared thermal emissivity of the PET fiber membrane are enhanced, and the radiation evaporation synergetic cooling structure integrated Janus fiber membrane is prepared. And spraying octadecyl trichlorosilane on the PET fiber membrane loaded with CaHPO4 by adopting a spraying process, and depositing a netted hydrophobic coating inner layer and a netted water transmission channel which are uniformly and regularly arranged on a single side, thereby obtaining the structure integrated Janus fiber membrane. The structure-integrated Janus fiber membrane provided by the invention not only has the function of radiation cooling cooperating with evaporation cooling and the function of directional water transmission, the directional water transmission index R is as high as 991%, and the original excellent performance of the PET fiber membrane is reserved.

The invention discloses a preparation method of monodisperse porous silicon dioxide microspheres. The preparation method comprises the following steps: carrying out cationization modification on monodisperse porous polymer microspheres; the method comprises the following steps: adding alkaline amino acid into pure water, and dispersing the surface cationized monodisperse porous polymer microspheres in the alkaline amino acid; adding a silicon dioxide precursor into the solution in one step to prepare polymer-silicon dioxide composite microspheres, filtering, washing and drying; and calcining the polymer-silicon dioxide composite microspheres in a distributed manner, and removing the organic polymer to obtain the monodisperse porous silicon dioxide microspheres. One-step feeding and stable reaction of a silicon dioxide precursor are realized by adjusting the solvent environment and alkaline conditions in the synthesis process of the polymer-silicon dioxide composite microspheres. The problems that the reaction process is tedious and difficult to control and microspheres are prone to agglomerate are solved.

The invention discloses activated carbon with biochemical sludge doped with organic matter and a preparation method thereof.The preparation method comprises the following steps that the biochemical sludge is subjected to dehydration pretreatment and fully mixed with the organic matter, then drying and smashing are conducted, and standby sludge particles are obtained; carbonizing the standby sludge particles at constant temperature, and grinding to obtain carbonized material powder; mixing the carbonized material powder with an activating agent, adding the mixture into deionized water, carrying out water-bath heating reaction, and filtering and drying a product; performing constant-temperature activation under the protection of inert gas to obtain an activated product; and placing the activated product in concentrated acid for ultrasonic treatment, and then washing, drying and crushing to obtain the product. According to the method, the biochemical sludge is prepared into the activated carbon, waste is turned into wealth, resource utilization of the biochemical sludge is achieved, the treatment cost of the biochemical sludge is saved, environmental benefits and economic benefits are achieved, and the obtained activated carbon is stable in structure, developed in pores, large in specific surface area and high in adsorbability.

The invention discloses an L-amino acid ligase and application thereof in catalytic synthesis of L-valine dipeptide and derivatives thereof, the amino acid sequence of the L-amino acid ligase is selected from any one sequence of SEQ ID No: 2-9, the L-amino acid ligase is prepared by firstly constructing a genetic engineering strain of a biological enzyme, and synthesizing a biological enzyme gene segment obtained by whole-gene synthesis into L-valine dipeptide and a derivative of the L-valine dipeptide. Using restriction endonuclease to linearize recombinant plasmids, and then performing activation and fermentation induction culture on the positive clones to prepare the recombinant plasmid. The invention also provides a method for catalytically synthesizing the L-valine dipeptide and the derivative thereof by using the L-amino acid ligase disclosed by the invention, the synthesis route is simple, the raw materials are cheap and easy to obtain, the use amount of the enzyme is less than 0.5%, the cost is low, and the conversion rate can reach more than 80%. The method has the advantages of simple post-treatment process, high product purity, high safety and small environmental pollution, and has extremely high economic value and industrial application prospect.

The invention belongs to the field of organic synthesis, fine chemicals and daily chemicals, and specifically relates to a method for preparing bosine from xylose and acetylacetone in one pot. The method is simple to operate, the reagents are cheap and readily available, and has good industrial application prospects.

The application discloses a sodium ion battery positive electrode material and a preparation method thereof. By adding cheap, non-toxic, environment-friendly and easily-degradable water-soluble cellulose as an additive, the growth of a specific crystal direction can be inhibited. The hydrophilic group of the water-soluble cellulose can change the coordination environment of metal ions and reduce the entry of water molecules into the crystal lattice. In addition, by introducing the water-soluble cellulose, high-concentration reactant feeding can be realized, which is beneficial to reducing the consumption of industrial water. Meanwhile, compared with other existing additives, the water-soluble cellulose is environment-friendly, easily-degradable, low in production and separation cost, and free of toxic by-product generation. The prepared open three-face cubic Fe-based Prussian blue analogue material is good in dispersity, high in purity and uniform in morphology, and as a sodium ion battery positive electrode material, has a reversible capacity of 155.40 mAhg ‑1 at 0.1C (1C=170 mAhg ‑1 ) and a first discharge coulombic efficiency of 97.83%.

The invention provides a boronized fatty glyceride anti-wear additive and a preparation method thereof, the anti-wear additive comprises a compound shown as a formula I, a compound shown as a formula II and a compound shown as a formula III: # imgabs0 #, in the formula I, R1, R2 and R3 are the same or different and are respectively and independently selected from C3-C24 alkyl; in the formula II, R is selected from C3-C24 alkyl groups, and R5 is selected from C4-C24 alkyl groups and C6-C18 aryl groups; in the formula III, R5 is selected from alkyl groups of C4-C24 and aryl groups of C6-C18; r4 and R6 are the same or different and are independently selected from # imgabs 1 #, and R7 and R8 are the same or different and are independently selected from C3-C24 alkyl groups. The anti-wear additive has excellent anti-wear performance and good thermal stability, and does not generate adverse effects on the corrosion performance of lubricating oil.

The invention relates to the technical field of biotechnology synthesis, and discloses a method for synthesizing beta-nicotinamide mononucleotide through enzymatic conversion. The used enzyme is a compound enzyme solution composed of nicotinamide riboside kinase and phosphotransferase, and the phosphoric acid donor is an acetyl phosphoric acid diamine salt. The acetyl phosphoric acid diamine salt has the characteristic of low cost, and has a low-residue effect compared with other phosphoric acid donors, so that the subsequent impurity removal process is effectively simplified. In addition, ADP generated in the reaction process is converted into ATP for cyclic utilization under the action of the diammonium acetylphosphate and phosphokinase, so that the use amount of ATP is greatly reduced, the cost is reduced, few byproducts are produced, the post-treatment process is convenient to simplify, and the method is suitable for large-scale production of beta-nicotinamide mononucleotide.

The application discloses a method for synthesizing isooctanol benzoate by using a composite catalyst, and comprises the following steps: mixing isooctanol, the composite catalyst and benzoic acid, and heating and stirring, then increasing the temperature to 140-210 DEG C, carrying out esterification reaction for 5-7 hours, after the esterification reaction is completed, carrying out decoloration, neutralization, water washing, dehydration and dealcoholization, filtering, and cooling to obtain isooctanol benzoate. The application has the beneficial effects that by using the composite catalyst, the color number of the product can be reduced, the reaction speed can be accelerated, the isooctanol utilization rate can be improved, and the esterification reaction efficiency is improved; the process is simple, the production cycle is short, the product yield is high, the color number is small, energy is saved, the environment is protected, and industrialization is easy to realize.

This invention belongs to the field of polyolefin recycling technology and relates to a method for preparing high-quality carbon nanotubes by catalytic carbonization of polyolefins. In this invention, polyolefins are degraded at high temperature to generate small-molecule hydrocarbons. Subsequently, a Ni-Mo-Al catalyst undergoes a reduction reaction to generate elemental nickel. The elemental nickel catalyzes the degradation products to undergo dehydrogenation, cyclization, and aromatization reactions, followed by carbon deposition on the surface of the elemental nickel, which gradually grows into carbon nanotubes. Furthermore, the Ni-Mo-Al catalyst can reduce the formation of amorphous carbon, thereby increasing the activity of elemental nickel and reducing its ability to dissolve carbon, thus preparing carbon nanotubes with smaller diameters and uniform morphology. This invention has the advantages of inexpensive and readily available carbon sources and a simple preparation method, realizing the upgraded chemical recycling of waste polyolefins and the controllable preparation of carbon nanotubes, effectively solving the problem of reusing urban and industrial waste polyolefins.

This invention discloses a method for synthesizing fluopyram. The method involves reacting diethyl 2-(3-chloro-5-(trifluoromethyl)pyridin-2-yl)malonate with dihalomethane in the presence of a polar aprotic solvent and an inorganic base to obtain diethyl 2-halomethyl-2-(3-chloro-5-(trifluoromethyl)pyridin-2-yl)malonate, followed by condensation with 2-trifluoromethylbenzamide to obtain diethyl 2-(3-chloro-5-(trifluoromethyl)pyridin-2-yl)-2-((2-(trifluoromethane)benzoylamino)methyl)malonate. After adjusting the pH of the reaction system to 4-5, the temperature is increased to induce a decarboxylation reaction, yielding fluopyram. This invention employs a simple one-pot process, which is convenient to operate, has a high yield, and low cost, making it suitable for industrial production.

The invention discloses an efficient and environment-friendly 1-bromo-dibenzofuran synthesis process, and belongs to the technical field of organic matter synthesis. The method is used for solving the technical problems in the prior art that raw materials for synthesis are toxic and strong in corrosivity, the preparation process is complicated, and the yield and the purity of a product obtained through multiple times of post-treatment are reduced in the process for synthesizing the 1-bromo-dibenzofuran. The invention relates to an efficient and environment-friendly 1-bromo-dibenzofuran synthesis process which comprises the following steps: carrying out Williamson synthesis reaction on 2, 3-dibromo fluorobenzene, phenol, strong alkali and weak acid salt, a solvent and a catalyst A to obtain an intermediate 1; the intermediate 1, alkali, an initiator and a catalyst B are subjected to a ring closing reaction, and 1-bromo-dibenzofuran is synthesized. The 1-bromo-dibenzofuran is prepared by adopting a two-step method, the adopted raw materials are green and environment-friendly, the synthesis process is simplified and efficient, and the obtained product 1-bromo-dibenzofuran is high in yield and high in purity.