36results about How to "The production process is safe and controllable" patented technology

The invention provides a tissue engineering nerve graft based on a biological printing technology and a preparation method thereof. The tissue engineering nerve graft comprises an outer tube and a tube inside scaffolds, wherein trophic factors and/or cells can cover the inner surface and the outer surface. A high-fidelity printing operation is performed according to the actual nerve shape demand by utilizing the biological printing technology, a polymer solution is printed into the specified nerve graft in a three-dimensional way by using an ink-jet printer by adjusting the sizes and the quantity of the jet nozzles of the ink-jet printer, the distances from the jet nozzles to a bottom layer and the pulse frequency of a supercharger and writing a control program of specific printing, and the specified nerve graft is applied to treatment of peripheral nerve defect and spinal cord injury.

The invention discloses viscous porous granulated ammonium nitrate fuel oil explosive and a preparation method thereof. The ammonium nitrate fuel oil explosive comprises the following constituents in weight percent: 83 to 85 percent of porous granulated ammonium nitrate, 4.5 to 6 percent of compound oil phase, 3.5 to 6 percent of tackifier, 0.2 to 0.5 percent of expanded perlite, 1.3 to 2 percent of powder type explosive energy accelerant, and 3 to 5 percent of thickener. The method comprises the following steps: a, adding the porous granulated ammonium nitrate into a viscous porous granulated ammonium nitrate fuel oil explosive mixer, then adding the compound oil phase, stirring for 2 to 4 minutes at normal temperature, mixing the porous granulated ammonium nitrate and the compound oil phase to be uniform, so as to form mixture A; b, adding the tackifier, the powder type explosive energy accelerant and the expanded perlite into the mixture A, stirring for 1 to 2 munities at normal temperature, mixing the mixture A, the tackifier, the powder type explosive energy accelerant and the expanded perlite to be uniform, so as to form mixture B; and c, adding the thickener into the mixture B, stirring for 1 to 2 munities at normal temperature, and mixing the mixture B and the thickener to be uniform, so as to form the viscous porous granulated ammonium nitrate fuel oil explosive, and then packaging the viscous porous granulated ammonium nitrate fuel oil explosive. The viscous porous granulated ammonium nitrate fuel oil explosive and the method have the advantages that preparation and storage processes are safe and controllable, the power capability is high, the storage period is long, and the explosive is efficient and environmentally friendly.

The invention provides a continuous producing device of phosphorus pentafluoride, comprising a phosphorus single-substance closing silo, a spiral conveyer, a fluorine-phosphorus reactor, a cooling pipeline and a multi-grade filter. The continuous producing device of phosphorus pentafluoride is characterized in that the upper end of the spiral conveyer is connected to the lower end of the phosphorus single-substance closing silo, the tail end of the spiral conveyer is connected to the upper part of the fluorine-phosphorus reactor; one end of the fluorine-phosphorus reactor is connected with the cooling pipeline, and the other end of the cooling pipeline is connected with the multi-grade filter. The invention further provides a method for continuously producing phosphorus pentafluoride by using the device; the high-purity phosphorus pentafluoride gas is obtained by pre-reaction, continuous reaction, cooling and multi-grade filtering. According to the continuous producing device, the continuous production of phosphorus pentafluoride is realized; the continuous producing device has the advantages of being high in production efficiency, simple, safe and reliable in operation and good in product quality; the product purity can reach 99.8% above; therefore, the continuous producing device can be directly applied to the production of the lithium hexafluorophosphate.

The invention discloses a tissue engineering nerve graft with a suspension fiber scaffold. The nerve graft comprises a conduit and tube fiber scaffolds. The nerve graft is characterized in that a plurality of suspensions are arranged on each fiber scaffold along the fiber length direction, and are connected with the inner wall of the conduit; and the fiber scaffolds are distributed and suspended in the conduit by virtue of the suspensions. By utilizing bio-printing technology, built-in microfilaments of a tissue engineering nerve graft can be stably and uniformly distributed in the conduit by utilizing the supporting force of the suspensions, and each fiber scaffold has an independent space to guarantee that nerve cells can directionally grow along the fiber scaffolds and cannot have error bridging, so that the success rate of operations can be greatly improved.

The invention discloses a high-purity nickel-based high-temperature alloy and a preparation method of spherical powder of the high-purity nickel-based high-temperature alloy. The alloy comprises the following steps of selecting high-purity metal ingredients, smelting in a vacuum induction suspension smelting furnace, realizing pure smelting by controlling parameters such as smelting vacuum degree, refining temperature, time and the like, then pouring to obtain a steel ingot, and preparing the steel ingot into a bar; carrying out smelting, atomizing and powdering on the bar through EIGA and PREP technologies to obtain spherical metal powder; adopting vibrating screening and airflow classification, and classifying spherical powder under the protection of inert gas. According to the method, the content of nonmetal impurities is effectively controlled through raw material smelting control, atomization process control and post-treatment control, so that chemical elements of the powder have extremely high purity, and the high-purity high-temperature alloy spherical powder is not prone to generating cracks and other defects in the subsequent laser additive printing and laser cladding process and is good in binding force, high in strength, good in toughness and good in mechanical property, and the powder can be used for repairing high-end parts.

The invention discloses a light heat-insulation noise-reduction SiO2 aerogel material and a preparation method thereof, and belongs to the technical field of high-performance porous materials. The preparation method comprises the following steps: carrying out an acid-base two-step method and standing replacement on a trifunctional silicon source and a cationic surfactant in a water solvent to obtain an aerogel material; wherein the molecule of the trifunctional silicon source comprises a non-polar group which does not participate in hydrolytic condensation and three alkoxy groups which participate in the hydrolytic condensation. In the preparation method designed by the invention, water is used as a solvent, a surfactant is added to reduce the surface tension of the solvent, and an ordered assembly is formed in an aqueous solution to provide a micro-reaction container for a hydrophobic trifunctional silicon source; therefore, the prepared SiO2 aerogel material has the advantages of low density, low heat conductivity coefficient, high transparency and the like.

The coenzyme Q10 synthesizing process with coenzyme Q0 hydroquinone and isodecyl alcohol deca-isopentyl alcohol of purity not lower than 95 % as material includes dewatering and condensation reaction at room temperature under the catalysis of trifluoro methane sulfonic acid in no oxygen environment to obtain coenzyme Q10 hydroquinone, the oxidation of the reacted product without passing through any treatment with hydrogen peroxide and water solution of ferric trichloride to obtain crude coenzyme Q10 product, and crystallization of the crude coenzyme Q10 product in acetone to obtain yellow coenzyme Q10 product powder in content over 99 % and yield over 65 %. The present invention has simple operation, easy purification of the product, high yield, mild reaction condition, safe and controllable production process and industrial production value.

The invention discloses a preparation method of 1H-1, 2, 3-triazole. The preparation method comprises the following step: performing a reaction on a compound A and sodium nitrite in a solvent I, wherein the compound A is 1,2-diamido-ethylene, 1,2-diamido-ethylene salt or a mixture of 1,2-diamido-ethylene and 1,2-diamido-ethylene salt. Compared with the prior art, the preparation method has the beneficial effects that (1) a production line is short, the conversion rate of a target product is high, the utilization ratio of atoms is high, and the atom economy is high; (2) the molar yield is high, and the total molar yield is above 90%; (3) the solvent can be recycled and reused, and the discharge amount of waste water is very small; and (4) a production process is safe and controllable.

The invention discloses transparent polystyrene with the capacity scale of 50,000 tons or above as well as production equipment and process of the transparent polystyrene. The main component of the obtained transparent polystyrene product is as follows: n is the degree of polymerization, and the range of the n is 600-7000, and the n is different along with different types of products. The transparent polystyrene has good transparency, the Vicat softening point is 85-106 DEG C, the tensile strength of the transparent polystyrene is 40-55 Mpa at normal temperature, and the transparent polystyrene is a thermoplastic material. The molecular structure contains a small amount of macromolecules with a special structure, and a considerable amount of hydrocarbon micromolecules are contained in gaps of the macromolecules, so that certain slippage can be generated among the macromolecules, and the material has good transparency and mechanical properties compared with products obtained by other process production methods. The process waste water is basically not generated in the production process, all the raw materials are recycled, a small amount of generated process waste gas reaches the standard and is discharged after being condensed and adsorbed by special equipment, and good environment-friendly, energy-saving and consumption-reducing effects can be achieved.

The invention discloses a treatment method for waste gas generated in the process of producing epoxy chloropropane through chloropropene epoxidation. The method comprises the following steps: treatingwaste gas generated in the process of preparing epoxy chloropropane through epoxidation reaction of a reaction control phase transfer catalyst, hydrogen peroxide and chloropropene, wherein the wastegas contains nitrogen, oxygen, chloropropene and water vapor; the nitrogen is added into a gas-phase buffer tank (V1)at the top of a reactor (R1)to dilute tail gas, the diluted tail gas passes througha first-stage condenser (E1), a second-stage condenser (E2)and a third-stage condenser (E3)to recover condensed chloropropene and condensate water and then enters a membrane filter (M1)to filter a chloropropene-containing gas, and the chloropropene-containing gas is compressed to recover the chloropropene; an inorganic matter-containing gas filtered by the membrane filter (M1)is condensed by a four-stage condenser (E4)to recover trace chloropropene in the inorganic matter-containing gas so as to reach the emission standard.

A device for producing expandable polystyrene by a bulk method comprises a polymerization reaction unit which is connected with a heating devolatilization device through a discharge pump; the upper end of the heating devolatilization device is connected with a condenser and a vacuum liquid collection tank; and the lower part of the heating devolatilization device is connected with a mixer, a melt heat exchanger, a pump and a high-pressure underwater pelletizing system through a pump. The device can be used for producing flame-retardant expandable polystyrene (EPS) and can also be used for producing graphite expandable polystyrene (EPS). The materials in the polymerization reaction unit comprise the following components in parts by weight: 80-95 kg of styrene, 2-10 kg of a solvent and 0.5-8 kg of an auxiliary agent. The particle size of the obtained expandable polystyrene EPS ranges from 0.7 mm to 1.0 mm, residual monomers are low, waste water is little, and the environment-friendly effect is good.

A low-energy-consumption device for producing expanded polystyrene through a bulk method comprises a polymerization reactor (1), the lower end of the polymerization reactor (1) is connected with a mixer (5) through a discharging pump (4), and then the polymerization reactor (1) is sequentially connected with a plug flow reactor (6), a static mixer (7), a plug flow reactor (8), a pump (9) and a high-pressure underwater pelletizing system (10) through pipelines. When the front end of the mixer (5) is provided with an interface for adding a molten flame retardant master batch, flame-retardant expandable polystyrene (EPS) can be produced; when the front end of the mixer (5) is provided with an interface for adding molten graphite master batches, graphite expandable polystyrene (EPS) can be produced. The size of the obtained expanded polystyrene particles can be strictly controlled between 0.7 mm and 1.0 mm, the expanded polystyrene particles have good impact resistance and tensile strength, and the unit energy consumption is reduced to one third.

The invention discloses an industrial-scale high-performance high-impact polystyrene production device and a production process. A pre-polymerization reaction device in the production device is a pre-polymerization reaction kettle group which is formed by combining four full mixing flow reaction kettles with stirring in a specific series-parallel connection manner; the prepolymerization reaction kettle group comprises two groups of parallel two-stage prepolymerization kettles, and each group of two-stage prepolymerization kettles consists of a first-stage prepolymerization kettle and a second-stage prepolymerization kettle which are connected in series. The production process is a styrene and rubber mixed solution graft copolymerization reaction process formed by combining four prepolymerization kettles; in the prepolymerization reaction, two groups of parallel two-stage prepolymerization kettles are adopted for feeding at the same time; by controlling different process conditions of each group of kettles, the reaction of each group of two-stage prepolymerization kettles reaches the styrene reaction conversion rate and the rubber grafting rate which meet specific requirements; and mixing the two groups of materials in a plug flow reactor, and further polymerizing to obtain the dispersed phase particle modified high-performance high-impact polystyrene with a submicrostructure with specific particle size and particle size distribution.