46results about How to "Improve carbonization yield" patented technology

A carbon material precursor comprises an acrylamide-based polymer and at least one addition component selected from the group consisting of acids and salts thereof; and a method for producing a carbon material comprises thermally-stabilizing the carbon material precursor and then carbonizing the carbon material precursor.

The preparation method of the precursor fiber of cellulose-based carbon fiber in chemical fiber production, first stirs and mixes the concentrated NMMO aqueous solution and the carbon black contained in the carbon black water dispersion at a weight ratio of 20 to 10000:1, and distills under reduced pressure to obtain a water-containing 24-28% NMMO / carbon black solution, and then add the cellulose pulp cut into small pieces and NMMO / carbon black solution into the dissolution kettle at a weight ratio of 5-15:100, and pass through static at 70-90°C. After swelling and strong stirring, the temperature is raised to 90-120°C, and the water is removed by stirring and vacuum distillation to generate a cellulose / NMMO / carbon black spinning stock solution with a water content of 12%-14%. The filaments yield precursor fibers of cellulose-based carbon fibers. Due to the addition of carbon black in the present invention, the carbonization yield and mechanical properties of the carbon fiber prepared after oxidation and carbonization treatment are all significantly improved; the carbon black aqueous dispersion with a smaller particle size or even nano-scale is used as an additive to make spinning The silk stock solution has good spinnability; the solvent used is non-toxic, the recovery rate is high, and the spinning process is simple and environmentally friendly.

The invention discloses biomass porous activated carbon and a preparation method thereof and application of the biomass porous activated carbon as an electrode material of a double electric layer capacitor. After a biomass raw material is pulverized by a high-energy pulverizer, the biomass raw material is placed in a furnace, protective gas is introduced into the furnace, the temperature is raisedto an activation temperature under a protective atmosphere, then activation gas is introduced into the furnace for activation treatment, protective gas is introduced into the furnace again, and the temperature is lowered to a normal temperature under a protective atmosphere to obtain the biomass porous activated carbon. The method maintains an original biological structure and ordered pore structure of wood fiber in the biomass material by high-energy pulverization combined with gas activation treatment, the prepared porous activated carbon has a large specific surface area and a high mass transfer rate and is applied as the electrode material of the electric double layer capacitor, and a capacitor with high energy density and good cycle performance can be obtained; and the porous activated carbon has a low preparation cost, simple operation and a short production cycle, and meets industrial production.

A process for producing a spherical carbon material, comprising: subjecting a spherical vinyl resin to an oxidation treatment in an oxidizing gas atmosphere to obtain a spherical carbon precursor, and carbonizing the spherical carbon precursor at 1000-2000° C. in a non-oxidizing gas atmosphere. The thus-obtained spherical carbon material exhibits excellent performances, including high output performance and durability, when used, e.g., as a negative electrode material for non-aqueous electrolyte secondary batteries.

A method for producing a fire-resistant fiber, which is characterized by comprising subjecting an acrylamide polymer fiber to a heat treatment at a fire-resistant treatment temperature in the range of200-500 DEG C in an oxidizing atmosphere while imparting a tension of 0.07-15 mN / tex to the acrylamide polymer fiber.

The invention provides a preparation method for a three-dimensional hierarchical porous biomass carbon negative electrode material of a lithium ion battery. According to the invention, edible fungus is used as a raw material for biomass carbon and three-dimensional hierarchical porous biomass carbon is prepared through a combination of a microwave hydrothermal method and a heat treatment method; the three-dimensional hierarchical porous biomass carbon has good cycle stability and rate capability when used as the negative electrode material of the lithium ion battery; the edible fungus contains rich polysaccharides, so carbonization yield of biomass is high; a cell wall contains abundant chitin, so a stable carbon skeleton can be formed and enables the negative electrode material to have a stable structure and to be not prone to collapse during charging and discharging; and the pore size of the material can be controlled by controlling alkali concentration, so the electrochemical performance of the material is improved.

The invention provides a preparation method of high-yield needle petroleum coke. The preparation method comprises the following steps: uniformly mixing FCC oil slurry with haloalkane (iodomethane or ethyl iodide), polyol (polyethylene glycol, polypropylene glycol and trimethylolpropane) and boron trifluoride according to catalyst-oil ratios of 0.01 to 0.07 g / g, 0.03 to 0.08 g / g and 0.001 to 0.02 g / g, respectively; carrying out coupled catalytic polycondensation-shallow alkylation for 4-6 h at a certain temperature to produce a carbene mixture with high molecular weight and high aromaticity, which enables the cross-linking and coupling degrees of fused-ring aromatic compounds to be increased; then subjecting the obtained carbene mixture to a carbonization reaction at 550-600 DEG C for 10 to14 h so as to obtain green needle coke; and finally carrying out calcination at a high temperature of 1500 DEG C so as to obtain the needle petroleum coke. The method of the invention is a combined process of coupled alkylation-carbonization reactions, has the characteristics of controllable molecular weight and aromaticity of an intermediate and easy control of carbonization reaction depth and mesophase formation; and the obtained needle coke has the advantages of high yield and low thermal expansion coefficient, and has general yield of no less than 70% and a thermal expansion coefficient as low as 0.9*10<-6> to 1.6*10<-6> / DEG C.

The invention relates to the field of battery manufacturing and energy storage, in particular to a preparation method for an all-vanadium redox flow battery electrode material. The preparation method comprises the steps of taking alkaline lignin as a test material, partially substituting the hydroxymethylation alkaline lignin by a phenolic hydroxyl active functional group in an alkaline lignin structure, synthesizing organic gel from resorcinol and formaldehyde under the effect of a catalyst, preparing a precursor spinning liquid required for an experiment by taking the gel as a precursor, preparing a fiber precursor electrode material by an electrostatic spinning method, pre-oxidizing the electrode material precursor by a vacuum / atmosphere furnace, and performing carbonization in an inertia atmosphere to obtain the carbon fiber electrode material. In the vanadium battery carbon fiber electrode material prepared by the method, the fiber diameter is in nanoscale, and the specific area is greatly expanded compared with a traditional carbon felt electrode material; and due to pre-oxidization processing in post period, the oxygen content of the fiber surface is also greatly improved, and the method can be used for preparing the vanadium battery carbon fiber electrode material.

The invention relates to a preparation method of phenolic resin combined honeycomb activated carbon, which can be used for preparing the honeycomb activated carbon by the steps of: mixing dry powder, preparing plastic pug by mixing and kneading through a wet method, vacuum pugging, extrusion molding, drying, curing treatment and secondary heat treatment. Besides the function of bonding and improving the mechanical strength of the activated carbon, the phenolic resin also remarkably improves the heat-resisting property and water resistance of the honeycomb activated carbon; and furthermore, the honeycomb activated carbon is added with porous mineral, thus better effectively improving the mechanical strength and the specific surface area of the honeycomb activated carbon. The preparation method has lower heat treatment temperature and low production energy consumption, and effectively reduces the production cost; and the preparation technique and equipment thereof are simple, and the production investment is lower, so that the cost is further reduced.

The invention belongs to the technical field of polymer carbonization, and in particular relates to a carbon material prepared by utilizing inorganic carbon to promote polyolefin carbonization and a preparation method. The preparation method of the invention comprises the following steps: (1) uniformly mixing the polyolefin and the inorganic carbon material to obtain the mixture; (2) heating the mixture to a preset carbonization temperature for carbonization to obtain the carbon material. The present invention prepares functional carbon materials by promoting low-temperature carbonization of polyolefins with inorganic carbon, and the prepared carbon materials do not need to be post-treated, and the use of inorganic carbon catalysts also promotes the crosslinking reaction of polyolefins, effectively improving the carbonization yield, The carbonization temperature is reduced, and at the same time, it has the advantages of low catalyst price, low carbonization temperature, and high carbonization controllability. It has important guiding significance for large-scale treatment of waste polyolefin plastic products.