1896 results about "Amination" patented technology

The invention provides a high-temperature-resistant and high-salt-resistant nano imbibition agent as well as a preparation method and application thereof. The high-temperature-resistant and high-salt-resistant nano imbibition agent is prepared from amination modified mesoporous silica nanoparticles, nano cellulose, rhamnolipid, an anionic surfactant, citrate modified sodium zirconium phosphate, polyethylene glycol-b-polycaprolactone and a sulfydryl-carboxyl imidazoline derivative, therefore, the composite carrier formed by the aminated mesoporous silica nanoparticles and the nanocellulose has high mechanical strength and uniform dispersity, the oil-water interfacial tension is reduced through the synergistic effect of the rhamnolipid and the anionic surfactant, and the crude oil stripping efficiency is remarkably improved; the citrate modified sodium zirconium phosphate enables the salt resistance of the system to be greatly improved, and in a high-temperature and high-salt oil reservoir environment, the nano imbibition agent can remarkably improve the crude oil recovery rate and reduce the injection pressure and dosage; meanwhile, good adsorption resistance is achieved, and reservoir blockage is prevented; in addition, low-toxicity corrosion inhibition components protect equipment, and the service life of an oil well is prolonged.

The invention discloses silk fibroin composite gel and a preparation method thereof, and relates to the technical field of tissue filling materials. The preparation method of the silk fibroin composite gel comprises the following steps: preparing silk fibroin and carrying out amination modification on the silk fibroin to obtain aminated silk fibroin; carrying out dynamic cross-linking on the aminated silk fibroin and the oxidized sodium alginate through a Schiff base bond by adopting an enzyme catalysis cross-linking process to obtain a dynamic cross-linked network solution; adding a temperature-sensitive component into the dynamic cross-linked network solution, and uniformly mixing to obtain a temperature-sensitive-dynamic dual-network pre-gel solution with temperature responsiveness; loading the active component into the temperature-sensitive-dynamic dual-network pregel solution to obtain a composite gel solution; incubating the composite gel solution to obtain primary gel; after disulfide bonds are introduced into the primary gel, cross-linking strengthening and sterilization are carried out, and the silk fibroin composite gel is obtained. Through temperature-sensitive-dynamic dual-network design, active components and disulfide bonds are introduced to strengthen crosslinking, and the problems that traditional injectable gel is irreversible, single in function, prone to collapse after being filled and the like are systematically solved.

The invention belongs to the technical field of biomedical materials, and particularly relates to adipose-derived mesenchymal stem cell loaded conductive hydrogel and a preparation method and application thereof, the preparation method comprises the following steps: step S1, after hyaluronic acid is subjected to oxidation treatment, dopamine is grafted to oxidized hyaluronic acid, and oxidized hyaluronic acid-dopamine is obtained; step S2, carrying out amination treatment on gelatin to obtain aminated gelatin; s3, mixing the oxidized hyaluronic acid-dopamine with the aminated gelatin, and carrying out Schiff base crosslinking, so as to obtain hydrogel; and step S4, loading the adipose tissue-derived stromal cells by using the hydrogel. Dopamine is grafted on an oxidized hyaluronic acid macromolecular chain through amidation reaction, the hydrophilicity and the electrical property of the macromolecular chain are improved, a catechol structure is provided to provide possibility for iron ion coordination, the tissue adhesion, the injectability, the mechanical property and the electrical conductivity of the hydrogel are improved, and the hydrogel can be applied to the field of biomedical materials. After being applied to a spinal cord injury rat model, the functional recovery can be promoted.

The invention relates to the technical field of biology, in particular to a leucine dehydrogenase mutant and application thereof. According to the leucine dehydrogenase mutant and the application thereof provided by the embodiment of the invention, wild leucine dehydrogenase is subjected to mutation screening to obtain the leucine dehydrogenase mutant with an amino acid sequence as shown in SEQ ID NO: 1 or SEQ ID NO: 2, the catalytic efficiency of asymmetric reductive amination of a prochiral alpha-keto acid compound is improved, and the thermal stability of the leucine dehydrogenase mutant is improved; the synthesis efficiency of the L-amino acid is favorably improved.

The invention relates to the technical field of cooling control, in particular to an amination automatic cooling system and method for monosultap preparation. Acquiring the temperature change rate and heat release time sequence data of the current amination process, and comparing the temperature change rate and heat release time sequence data with the temperature change rate of the historical temperature rise stage; and segmenting the current temperature change rate data into a plurality of temperature change sections, quantifying the difference between each section and historical comparison data in length and temperature change rate, and obtaining a cooling effect value to evaluate the cooling performance. And performing multi-length division on each temperature change section to obtain interval data sections, analyzing temperature fluctuation differences of the interval data sections, and determining an optimal division method and an optimal interval data section in combination with a cooling effect value. And finally, the preset flow velocity of the cooling liquid is adjusted based on the temperature change feature position and the heat release accumulation of the optimal interval data segment, so that a self-adaptive flow velocity value is obtained, and the matching degree of the cooling effect and the reaction requirement is effectively improved.

The invention belongs to the technical field of membranes, and discloses a preparation method and application of a small-aperture amination-polyamide roll type ultrafiltration membrane, a polyamide layer is subjected to amination treatment by using DETA (diethylenetriamine), the electronegativity of the surface of the membrane is changed by optimizing the concentration of DETA, the charge property of the surface of the membrane is optimized, and the electronegativity of the surface of the membrane is reduced, so that the ultrafiltration membrane is prepared. Therefore, the influence of the electrostatic repulsion effect on the rejection rate is reduced, and the separation performance of the membrane on small-molecular organic matters / inorganic salts is improved. The preparation method is simple to operate and low in cost. The prepared small-aperture amination-polyamide roll type ultrafiltration membrane can be used for recycling RO concentrated water in the field of printing and dyeing wastewater treatment and the application fields of purification and decoloration of macromolecules such as protein, polypeptide and drugs in the pharmaceutical industry.

The imine reductase mutant provided by the invention can catalyze asymmetric reductive amination of ethyl 3-formylhexanoate and (S)-2-aminobutanamide to synthesize brivaracetam, two chiral centers of brivaracetam are constructed in one step, and the problems of poor environmental protection property, low atom utilization rate, long route and the like in the existing industrial synthesis route are solved. Wide application prospects are realized.

The invention discloses a preparation method of sandwich type immunomagnetic beads with high thermal stability, which comprises the following steps: by taking polystyrene microspheres as a template, introducing oil-phase Fe3O4 nanoparticles into the polystyrene microspheres through a swelling method, and then carrying out hydrolytic condensation reaction on the surface of a microsphere assembly by utilizing n-octyltrimethoxysilane OTMS to obtain the sandwich type immunomagnetic beads with high thermal stability. The preparation method comprises the following steps: carrying out surface amination modification on a silicon dioxide thin layer which is grown by hydrolysis of tetraethoxysilane TEOS to realize coating of an outermost organic shell layer, carrying out surface amination modification, and carrying out cross-linking on 1, 4-butanediol diglycidyl ether and erythritol on the surface to form an epoxy polymer layer so as to obtain the sandwich-type immunomagnetic bead with a cross-linked epoxy polymer layer introduced to the outer layer. According to the epoxy group modification process on the surface of the magnetic bead, a direct cross-linking modification process is adopted, so that the operation steps are simplified, and the obtained epoxy group magnetic bead is ensured to show excellent biocompatibility. In addition, the method omits the tedious process of functional group activation, and allows direct coupling with the antibody, thereby greatly improving the efficiency and convenience of the experiment.

The application discloses a method for selectively preparing furan amine or tetrahydrofuran amine from furan aldehyde substances, which comprises the following steps: in an aqueous solution with the volume percentage concentration of ammonia water being greater than 70%, furan aldehyde substances are subjected to a reductive amination reaction in the presence of H2 and under the action of a catalyst to prepare furan amine; and in an aqueous solution with the volume percentage concentration of ammonia water being less than 20%, furan aldehyde substances are subjected to a reductive amination reaction in the presence of H2 and under the action of a catalyst to prepare tetrahydrofuran amine. The method can realize the selectivity of products by changing the addition amount of ammonia water in the aqueous solution, and is simple, easy to control, and suitable for industrial production and market promotion and application.

The invention relates to the technical field of composite fabrics, and discloses a preparation method of an antibacterial flame-retardant composite superfine fiber fabric, nylon 6 and low-density polyethylene are subjected to spinning, stretching and heat setting to obtain a fabric base layer, tris (2-chloroethyl) phosphate, p-dimethylaminobenzaldehyde and the like are used as raw materials, and the antibacterial flame-retardant composite superfine fiber fabric is prepared. Performing quaternization and amination reaction to obtain an antibacterial flame-retardant chain extender, and participating in synthesis of polyurethane to obtain a functional layer; the materials of all the layers are flatly laid according to the structure of the fabric base layer, the adhesive layer, the barrier layer, the adhesive layer and the functional layer, and the antibacterial flame-retardant composite superfine fiber fabric is obtained after hot-pressing compounding. The phosphorus and nitrogen elements and the Schiff base in the structure can block the exchange between the fiber matrix and oxygen and heat in the air, so that the flame-retardant effect is achieved; the quaternary ammonium salt cations interfere with metabolism of bacteria through electrostatic interaction, so that the bacteria die due to a'bacterial solution 'phenomenon, and an antibacterial effect is achieved.

The invention provides a modified amine curing agent, a preparation method, epoxy resin anticorrosive paint and application, and belongs to the technical field of paint. The modified amine curing agent provided by the invention is prepared from preparation raw materials including alicyclic diamine, m-xylylenediamine, a first glycidyl ether reagent, a second glycidyl ether reagent and a glycidyl ester reagent through amination reaction, the alicyclic diamine contains at least one primary amine group; the first glycidyl ether reagent is ethylene glycol diglycidyl ether and / or bisphenol A type diglycidyl ether; and the second glycidyl ether reagent is 1, 4-butanediol diglycidyl ether and / or C12-14 glycidyl ether. The modified amine curing agent is combined with the curing characteristics of amide and phenolic aldehyde amine, the epoxy resin anticorrosive paint prepared from the modified amine curing agent has a proper curing speed, the adhesive force of a cured coating is high, the anticorrosive effect is good, and the epoxy resin anticorrosive paint is particularly suitable for a high-humidity environment and an underwater environment.

Methods for the production of L-glufosinate (also known as phosphinothricin or (S)-2-amino-4-(hydroxy(methyl)phosphonoyl)butanoic acid) are provided. The methods comprise a two-step process. The first step involves the oxidative deamination of D-glufosinate to PPO (2-oxo-4-(hydroxy(methyl)phosphinoyl)butyric acid). The second step involves the specific amination of PPO to L-glufosinate, using an amine group from one or more amine donors. By combining these two reactions, the proportion of L-glufosinate in a mixture of L-glufosinate and D-glufosinate can be substantially increased.

The invention discloses a magnetic ion exchange resin and a preparation method thereof, and the preparation method comprises the following steps: preparing a reaction solution which comprises magnetic particles, glycidyl methacrylate, divinylbenzene and a photoinitiator; the mass ratio of the glycidyl methacrylate to the divinyl benzene is (4.5-10): 1; an ultraviolet-initiated polymerization step: irradiating the reaction solution by ultraviolet light to initiate a polymerization reaction to obtain magnetic microspheres; a functional modification step: mixing the magnetic microspheres with an ammoniation reagent for ammoniation reaction to prepare ammoniated magnetic microspheres; and mixing the ammoniated magnetic microspheres with an alkylation reagent, and carrying out an alkylation reaction to prepare the magnetic ion exchange resin. According to the method, the production time is remarkably shortened, the extra energy consumption is reduced, and the process production flow is effectively simplified.

The invention provides a lithium-supplementing composite additive, a lithium-supplementing positive pole piece for inhibiting flatulence and application, and belongs to the field of lithium ion batteries. The lithium supplementing composite additive is a mixture of a lithium supplementing agent and aminated aluminum oxide, the mass ratio of the lithium supplement agent to the aminated aluminum oxide is (6-10): (3-5); the aminated aluminum oxide is activated aluminum oxide modified by an amino organic matter; the mass ratio of the amino organic matter to the activated aluminum oxide is 3: (7-12); the lithium supplement agent is hydroxyl cycloenone dilithium salt or lithium carboxylate. The lithium-supplementing positive pole piece capable of inhibiting flatulence comprises a current collector, an active coating and a functional coating located on the surface of the active coating, and the functional coating contains a lithium-supplementing composite additive and has the functions of supplementing lithium, absorbing acid and inhibiting flatulence. The method is characterized in that the aminated alumina matrix can absorb hydrofluoric acid in an electrolyte, and the aminated group can absorb carbon dioxide generated by decomposition of a lithium supplement agent. The method can reduce the problem of battery cycle gas expansion in the use process of the lithium supplement agent, and improves the battery cycle and safety performance.

A method for preparing a sorbent material (3) for separating gaseous carbon dioxide from a gas mixture, preferably from at least one of ambient atmospheric air (1), flue gas and biogas, containing said gaseous carbon dioxide as well as further gases different from gaseous carbon dioxide, by cyclic adsorption / desorption using a sorbent material (3) capable of reversibly binding carbon dioxide and adsorbing said gaseous carbon dioxide in a unit (8), wherein the sorbent material (3) comprises: primary amine moieties as well as at least one of secondary amine, and tertiary amine moieties immobilized on a solid support, and is made using an amination pathway avoiding cross-linking.

The invention provides a preparation method and intermediates of alasset hydrochloride, which comprises the following steps: reacting an initial raw material as shown in a formula 1, which is protected by bare phenolic hydroxyl groups or different protecting groups, with bis (pinacolato) diboron to obtain an intermediate as shown in a formula 2, carrying out coupling reaction on the intermediate and a compound as shown in a formula 3 to obtain a corresponding hydroxyl-protected intermediate as shown in a formula 4, and separating and purifying the intermediate to obtain the alasset hydrochloride. The preparation method comprises the following steps: carrying out catalyst pressurized hydrogenation, carrying out asymmetric chiral hydrogenation to obtain an intermediate as shown in a formula 5, carrying out substitution or reductive amination to obtain an intermediate as shown in a formula 6, carrying out nucleophilic substitution on the intermediate as shown in a formula 7 to obtain an intermediate as shown in a formula 8, and carrying out deprotection to obtain a target product as shown in a formula I. According to the invention, a chiral resolution link in the existing preparation technology is avoided, and a chiral group is introduced through asymmetric hydrogenation, so that the yield is greatly improved, the production cost is greatly reduced, the tedious and tedious synthesis steps in the original process are shortened, and the post-treatment is simpler and more controllable.

The invention discloses a nickel and cadmium-containing nonferrous metal wastewater treatment method, and relates to the technical field of wastewater treatment. The preparation method comprises the following steps: by taking polyvinyl alcohol and gelatin as raw materials, carrying out amination modification through 3-amino-trimethoxysilane to prepare an aminated gelatin solution, and then adding a modified metal organic framework adsorption material and modified nitrogen-containing biochar to react to prepare an adsorbent with a good adsorption effect on metal nickel and cadmium. The modified metal organic framework adsorption material and the modified nitrogen-containing biochar have amino groups, so that the modified metal organic framework adsorption material and the modified nitrogen-containing biochar have good dispersibility in the aminated gelatin, and the adsorption effect of the adsorbent is improved.

The invention relates to the technical field of glass fiber modification, and discloses a flame-retardant modified glass fiber as well as a preparation method and application thereof, and the flame-retardant modified glass fiber is prepared by modifying glass fiber with an amino silane coupling agent and coating the surface of the glass fiber with a flame retardant. The preparation method of the flame-retardant modified glass fiber comprises the following steps: step 1, amination modification of the glass fiber: modifying the glass fiber by using an amino silane coupling agent to obtain GF-NH2; step 2, preparation of DOPO-PH (3, 4-Dimethyl-1, and step 3, synthesis of GF-coated DOPO-PH: dispersing GF-NH2 in a solvent to obtain a mixed solution, dissolving DOPO-PH in the solvent, and adding into the mixed solution to obtain the GF-coated DOPO-PH. According to the flame-retardant modified composite material prepared by the preparation method disclosed by the invention, the mechanical property of the material can be ensured while the candlewick effect of the material is inhibited.

The invention relates to the technical field of biology, in particular to an L-amino acid synthesis system and application. According to the L-amino acid synthesis system and application provided by the embodiment of the invention, in the presence of coenzyme NAD < + >, isopropanol is catalyzed by isopropanol dehydrogenase to generate acetone, and NAD < + > is reduced into coenzyme NADH; in the presence of coenzyme NADH, the leucine dehydrogenase mutant utilizes NH3 generated by ammonia water volatilization to perform asymmetric reductive amination on a prochiral alpha-keto acid compound, the NADH is oxidized into NAD +, the catalytic efficiency of asymmetric reductive amination of the leucine dehydrogenase mutant on the prochiral alpha-keto acid compound is improved, the circulating speed of the coenzyme NADH and NAD + is increased, and the catalytic activity of the leucine dehydrogenase mutant on the prochiral alpha-keto acid compound is improved. The catalytic efficiency of asymmetric reductive amination of the leucine dehydrogenase is favorably improved.

The invention relates to a composite alkaline ionic membrane as well as a preparation method and application thereof. The composite alkaline ionic membrane is obtained by carrying out anion exchange on a composite membrane consisting of a quaternized anion exchange membrane type polymer and an ion solvated polymer nanofiber membrane, the quaternized anion exchange membrane type polymer is distributed on the surface and in pores of the ion solvated polymer nanofiber membrane, and the quaternized anion exchange membrane type polymer and the ion solvated polymer nanofiber membrane are combined through a covalent bond; the preparation method comprises the following steps: coating the surface of an ion solvated polymer nanofiber membrane with an anion exchange membrane type polymer solution, filling pores in the membrane with the anion exchange membrane type polymer solution, and then sequentially carrying out a cross-linking reaction, a quaternization reaction and an anion exchange reaction to prepare the composite alkaline ionic membrane; the alkaline ionic membrane is applied to alkaline electrolysis of water for hydrogen production, alkaline fuel cells, carbon dioxide conversion or electrochemical synthesis of ammonia. The composite alkaline ionic membrane disclosed by the invention has excellent ionic conductivity and mechanical strength; the preparation method is simple and feasible; the application range is wide.

The invention relates to the technical field of wastewater treatment, in particular to a multistage composite adsorbent for treating petrochemical wastewater and a preparation method thereof.The preparation method comprises the steps that S1, plant straw powder and 3-aminopropyltriethoxysilane are subjected to a constant-temperature reaction, and aminated plant straw is obtained; s2, carrying out hydrothermal reaction on the aminated plant straw and a cerium nitrate solution to obtain functionalized plant straw; s3, the halloysite nanotubes, glutaraldehyde and the functionalized plant straw are stirred for a reaction, high-temperature carbonization is conducted after the reaction is completed, and composite biochar is obtained; s4, carrying out a reaction on the composite biochar and an amino silane coupling agent to obtain aminated composite biochar; s5, calixarene, toluene diisocynate and the aminated composite biochar are subjected to a reaction, and the multi-stage composite adsorbent is obtained. According to the technical scheme, the comprehensive adsorption capacity and removal efficiency of various organic pollutants in the petrochemical wastewater are improved, and the defect that a traditional adsorbent is poor in selectivity is overcome.

The invention discloses a production process of a modified p-phenylenediamine rubber anti-aging agent, which comprises the following steps: S1, catalyzing a ring-closure reaction through lipase, and accurately controlling pH by combining a phosphate buffer solution, so that the bonding efficiency of 6PPD and tea polyphenol is remarkably improved, and the release amount of aniline is effectively reduced; s2, carrying out spray drying to obtain EP-TP powder to control the particle morphology; s3, increasing the load rate of the anti-aging agent and effectively inhibiting the migration rate of the anti-aging agent through the pore diameter physical confinement of mesoporous silica and an amination gas phase modification technology, and ensuring uniform dispersion of anti-aging agent particles through the synergistic effect of staged load reaction and a polyethylene glycol dispersant; and S4, the particle morphology is cooperatively controlled through vacuum microwave drying, the dispersion requirement of the rubber mixing technology is met, and the interface bonding strength is improved by combining the staged loading reaction with a polyethylene glycol dispersing agent.

An active energy ray-curable inkjet printing ink composition satisfies requirements A to E below is provided: (A) the content of amine-modified oligomer is 1.0 to 20.0% by mass; (B) alkoxy group-containing (meth)acrylate monomers are contained by 2.0 to 20.0% by mass; (C) (meth)acrylate monomers having an alkyl group with 6 to 20 carbon atoms is contained by 2.0 to 25.0% by mass; (D) at least one type selected from the group that consists of 1,6-hexanediol diacrylate, 3-methyl-1,5-pentanediol diacrylate, dipropylene glycol diacrylate, 1,10-decanediol diacrylate, propoxylated(2)neopentyl glycol diacrylate, and hydroxypivalic acid neopentyl glycol diacrylate is contained by 30.0 to 60.0% by mass; (E) as photopolymerization initiators, ethoxy(2,4,6-trimethylbenzoyl)phenylphosphine oxide is contained by 3.0 to 15.0% by, and oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone) and / or 2-hydroxy-1-{4-[4-(2-hydroxy-2-methylpropionyl)phenoxy]phenyl}-2-methylpropanone is / are contained by 2.0 to 10.0% by mass, where the total content of photopolymerization initiators is 6.0 to 25.0% by mass.

The invention discloses a method for preparing furfuryl amine by reductive amination of biomass-based furfural, which comprises the following steps: adding furfural, a catalyst, ammonia water and a solvent into a closed reaction kettle in proportion, replacing air in the reaction kettle with high-purity hydrogen, and reacting in an oil bath pan for a period of time to obtain a target product furfuryl amine, the nano-catalyst provided by the invention is a nitrogen-doped porous hollow carbon sphere loaded nano bimetallic catalyst, takes noble metal and non-noble metal as a metal active center together, and has adjustability of macroscopic size and microstructure at the same time; the method has the advantages of simple reaction system, mild conditions, no pollution to the environment, high efficiency, energy conservation, low cost, few byproducts, high yield, high selectivity and the like, the furfural is efficiently converted into furfuryl amine at low temperature and low pressure within a short time, the used heterogeneous catalyst is stable and easy to recover, a new thought and direction are provided for enterprise production and scientific research, and the method is suitable for industrial production. The method has great significance on development and utilization of biomass-based furfural.

The invention discloses a method for preparing cyclohexylamine based on reductive amination of cyclohexanone, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: adding a reactant cyclohexanone into a reaction kettle containing a certain amount of solvent, ammonia water and hydrogen atmosphere, and carrying out reductive amination reaction in the presence of a catalyst to obtain cyclohexylamine. The catalyst is CoyAl-LDHs loaded with metal active components, the CoyAl-LDHs are layered cobalt-aluminum bimetal hydroxides, and cobalt ions and precious metal ions in laminates are subjected to spontaneous oxidation-reduction reaction, so that the precious metal ions can be efficiently reduced into active metal nanoparticles. The layered cobalt-aluminum double-metal hydroxide not only has abundant surface acid-base sites, but also has high dispersity of loaded metal nanoparticles. The catalyst preparation and reductive amination reaction conditions are mild, the yield is high, the reaction system is simple and easy to separate, and the method is suitable for industrial production of cyclohexylamine.

The invention provides a nano-drug based on atomic layer deposition and a preparation method of the nano-drug, mesoporous silica is taken as a carrier, bimetallic nanoparticles are precisely deposited through ALD, and chemotherapeutic drugs and antibacterial components are loaded by combining amination and targeted PEG modification, so that the following functions are realized: (1) H2O2 in a tumor microenvironment is catalyzed to generate reactive oxygen species (ROS); removing fusobacterium nucleatum and damaging a biological membrane of the fusobacterium nucleatum; (2) GSH is consumed through Fenton reaction, and tumor drug resistance is reversed; and (3) the drug is released in pH response, and tumor cells are accurately killed. The invention further provides application of the nano-drug based on atomic layer deposition in treatment of related drug-resistant colorectal cancer induced by fusobacterium nucleatum, the process is controllable, the biocompatibility is excellent, the treatment effect on the drug-resistant colorectal cancer is remarkably improved, and the nano-drug has wide clinical application prospects.

An object is to obtain a photocurable inkjet printing ink composition demonstrating not only excellent LED curability and anti-yellowing property but also excellent solubility, while allowing its viscosity to be adjusted to an appropriate level even in the absence of solvent. As a solution, a photocurable inkjet printing ink composition is provided that contains 1.0 to 10.0% by mass of amine-modified oligomers relative to all photopolymerizable components, as well as 1.0 to 40.0 parts by mass of photopolymerization initiators expressed by formula (1) below, and 0.3 to 5.0 parts by mass of thioxanthone-based sensitizers relative to all photopolymerizable components representing 100 parts by mass.

The invention discloses immobilized lipase based on carboxymethyl chitosan / lignin cross-linked composite microspheres as well as preparation and application of the immobilized lipase. The preparation method comprises the following steps: mixing a lignin solution with formaldehyde and an amination modifier for reaction to obtain aminated lignin, and reacting the aminated lignin with EDC / NHS and a carboxylation modifier to obtain aminated-carboxylated modified lignin; mixing lipase, carboxymethyl chitosan, modified lignin and water as a water phase, mixing the water phase with an oil phase containing a surfactant, and emulsifying to form a W / O emulsion; and dropwise adding an EDC / NHS solution into the W / O emulsion to complete a cross-linking reaction, removing an oil phase, and washing to obtain the immobilized lipase based on the carboxymethyl chitosan / lignin cross-linked composite microspheres. The method is good in balling effect and controllable in particle size; the immobilized lipase based on the carboxymethyl chitosan / lignin cross-linked composite microspheres has good biocompatibility, is biodegradable, has good mechanical properties and catalytic performance, and has huge application potential.

The invention discloses a nitrogen-containing carbon hollow sphere supported cobalt-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. According to the preparation method, ammonia water, tetraethyl orthosilicate, polyoxyethylene polyoxypropylene ether triblock copolymer, resorcinol and a formaldehyde solution are fully reacted in a mixed solvent of deionized water and ethanol by virtue of a template method, and the nitrogen-containing carbon hollow spheres are obtained after calcination and etching; then carrying out surface modification on the nitrogen-containing carbon hollow spheres, and uniformly loading cobalt metal by virtue of the structure guiding effect of hexamethyleneimine and sodium citrate dehydrate; the prepared nitrogen-containing carbon hollow sphere supported cobalt-based catalyst has abundant highly-exposed Co-N-C active sites, has wide substrate universality, has good catalytic activity and selectivity for amination reactions with various long-chain fatty aldehydes, fatty ketones, cyclic fatty ketones, aromatic aldehydes and ketones as raw materials, and can realize efficient catalytic amination reactions of carbonyl compounds.

The invention discloses a method for preparing ethylenediamine and piperazine from ethylene glycol, which comprises the following steps: in a system containing ethylene glycol, ammonia gas, hydrogen, a solvent and a catalyst, carrying out dehydrogenation, amination and hydrogenation on ethylene glycol and ammonia gas under the action of the catalyst to generate ethanolamine; the ethanolamine is further aminated to generate ethidene diamine; and further reacting ethylene glycol, ethanolamine and ethylenediamine to generate piperazine. According to the present invention, the solubility of ethanolamine and ethylenediamine is increased by introducing the solvent with the high polarity into the reaction system, such that the high ethylene glycol conversion rate is achieved under the mild reaction conditions (180-220 DEG C, 4-5 MPa), and the selectivity of ethylenediamine and piperazine is significantly improved. Wherein the selectivity of ethylene glycol can reach 74.1%, the sum of the selectivity of ethanediamine and piperazine can reach 85.5%, and the selectivity of piperazine can reach 73.3%.