11results about How to "Avoid environmental risks" patented technology

This invention provides a method for recovering and utilizing distillation residue after solvent removal from homohydric anhydride, relating to the field of fine chemical technology. The method includes anhydride treatment, vaporization and sublimation, dissolution and recrystallization, distillation, and water washing. In this invention, the distillation residue is anhydride-treated under high temperature and negative pressure, followed by vaporization and sublimation under vacuum to separate mechanical impurities and high-boiling substances. Then, through dissolution and recrystallization, the difference in solubility between homohydric anhydride and metahydric anhydride in polar solvents is utilized to preferentially crystallize out the homohydric anhydride. The mother liquor is distilled to remove the solvent, and then colored impurities are removed by hot water washing and activated carbon adsorption. Finally, it is cooled and crystallized to obtain trimellitic acid. The homohydric anhydride obtained by this invention has a purity ≥95% and a yield of 84-89%, and the trimellitic acid has a purity ≥97% and a yield of 81-86%. This method achieves effective recovery of high-value-added components from distillation residue, demonstrating significant economic and environmental benefits and promising application prospects.

The application discloses a kind of multistage synergic covalent grafting type hydrolysis-resistant self-cleaning PET submarine cable monofilament and preparation method, the monofilament includes three parts of core layer, skin layer and surface layer, the core layer is the high viscosity polyethylene terephthalate resin containing carbodiimide anti-hydrolysis agent;Skin layer is the modified PET resin of functional polysiloxane covalent grafting, wherein the functional polysiloxane has epoxy end group or isocyanate end group, and main chain has Si-H group;Surface layer is the fluorine-free low surface energy layer formed by polyvinyl long side chain alkane polysiloxane and residual Si-H group in skin layer through hydrosilylation reaction.The application significantly improves the durability of monofilament in humid heat environment, so that it is suitable for long-term humid heat service environment such as marine cable and industrial fabric, and can maintain stable mechanical strength and self-cleaning performance for a long time.

This invention relates to a method and system for precise ammonia injection control in a circulating fluidized bed boiler, comprising the following steps: S1, acquiring the flue gas temperature, flue gas velocity, and NOx concentration at each measuring point at the cyclone outlet, and calculating the average NOx concentration, average flue gas velocity, and average flue gas temperature; S2, based on the calculation results of S1, calculating the total amount of ammonia injected as a reducing agent, forming pre-feedback, and adjusting the total amount of reducing agent passing through the ammonia injection main valve; S3, acquiring the NOx concentration, flue gas temperature, and flue gas velocity at each spray gun, calculating the reducing agent dosage at each measuring point, forming post-feedback, and adjusting the reducing agent dosage passing through the ammonia injection branch valve on the branch where the spray gun is located at each measuring point; this method, by measuring the flue gas temperature, flue gas velocity, and NOx concentration at each measuring point at the cyclone outlet and at each spray gun, calculates the total amount of ammonia injected as a reducing agent and the amount of reducing agent used in each branch in real time, thereby adjusting the reducing agent dosage of the ammonia injection main valve and the ammonia injection branch valves of each branch, and achieving precise ammonia injection adjustment in real time.

The application relates to the technical field of sodium hypochlorite production and preparation, and particularly discloses a device for continuously preparing high-purity sodium hypochlorite, which comprises a first reaction kettle, a first water inlet pipe is connected with a water inlet of the first reaction kettle, and a first conveying pump is arranged on the first water inlet pipe; a first back pressure valve is arranged on the first water inlet pipe between the first conveying pump and the first reaction kettle; a first jacketed heat exchanger is sleeved on the outer circumferential surface of the first reaction kettle, a first jacketed heat exchanger inlet and a first jacketed heat exchanger outlet are arranged on the first jacketed heat exchanger, the first jacketed heat exchanger inlet is connected with a drain outlet of the first reaction kettle through a pipeline, the first jacketed heat exchanger inlet is connected with cooling water through a pipeline, and a second back pressure valve is arranged on the pipeline between the cooling water and the first jacketed heat exchanger inlet. The application has the characteristics of being capable of reducing by-products, improving the effective content and reducing the waste of raw material chlorine.

The invention discloses an oil sludge pyrolysis catalyst and a preparation method thereof, and belongs to the technical field of oily sludge treatment. The preparation method comprises the following steps: (1) pretreating coal coke to obtain modified coal coke; the pretreatment comprises the following steps: firstly, treating the coal coke by using organic acid, and then treating the coal coke treated by the organic acid by using alkali liquor; and (2) mixing the modified coal coke with ferric salt, and then sequentially carrying out solid-liquid separation, drying, calcining and reduction treatment to obtain the oil sludge pyrolysis catalyst. The coal coke is modified in an acid-base sequence, pore channels are opened and functional groups are increased through organic acid treatment, the pore channels are widened and heavy metal impurities are removed through alkali treatment, and the pore structure of the carrier is synergistically improved; then an iron active component is loaded, and the catalytic activity is improved through calcination and hydrogen reduction activation. When the prepared catalyst is used for oil sludge pyrolysis, the oil recovery rate can reach 94% or above, the preparation process is environmentally friendly, and resource utilization of oil sludge is achieved.

The embodiment of the present application relates to the technical field of soil remediation, in particular to a soil remediation system based on desulfurization gypsum and microorganisms, comprising: a desulfurization gypsum treatment assembly, which is used for preparing desulfurization gypsum powder and desulfurization gypsum slurry by taking desulfurization gypsum generated by a coal-fired power plant as raw material; a mineralization bacteria preparation assembly, which is used for obtaining desulfurization gypsum source functional mineralization bacteria liquid by taking desulfurization gypsum powder as an initial bacteria source; a soil plowing assembly, which is used for plowing the soil to be remediated after a spraying assembly applies desulfurization gypsum slurry to the soil to be remediated, so that the soil to be remediated is uniformly mixed with the desulfurization gypsum slurry to obtain pre-improved soil; and the pre-improved soil to which a remediation reaction liquid is applied is plowed to precipitate target heavy metal ions in the pre-improved soil. The technical scheme of the present application can improve the remediation effect of saline-alkali and heavy metal contaminated soil, and avoid the environmental risk caused by the storage of desulfurization gypsum.

The application belongs to the technical field of high polymer materials, and discloses a fluorine-free high and low temperature resistant organic silicon modified polyurethane elastomer as well as a preparation method and application thereof. The elastomer is prepared from an organic silicon modified polyurethane base and a peroxide compound solution, the mass of the peroxide compound solution is 1-5% of the mass of the organic silicon modified polyurethane base; the preparation raw materials of the organic silicon modified polyurethane base include 4,4'-dicyclohexyl methane diisocyanate, hydroxyl-terminated polybutadiene, monohydroxy polydimethylsiloxane, N1-(3-aminopropyl)-N1-dodecylpropane-1,3-diamine and 3-glycidyl ether oxypropyl triethoxysilane; the peroxide compound solution is prepared by dissolving benzoyl peroxide and dicumyl peroxide with a mass ratio of 1:0.5-1:2 in an organic solvent, stirring at room temperature until completely dissolved, and then preparing a homogeneous peroxide solution with a mass fraction of 5-20%.

The application provides a methanol control method for a marine methanol engine. The method predicts the risk of methanol leakage by analyzing the methanol escape route and gives a prediction control scheme to solve the leakage safety problem of the methanol engine in the actual working process, ensure the stable and reliable work of the methanol engine at the best, and improve the thermal efficiency. The method comprises the following steps: obtaining engine state information, methanol injection amount change trend state, engine speed difference information and engine torque difference information; comprehensively determining the engine state information, the methanol injection amount change trend state, the engine speed difference information and the engine torque difference information, and outputting the engine methanol supply state; the engine methanol supply state comprises methanol no escape, methanol imminent escape and methanol serious escape; and the methanol injection amount is subjected to feedforward control according to the engine methanol supply state.

The application discloses a kind of nanometer spray plating process of motorcycle hub, comprising the following steps: S1 substrate pretreatment: to aluminum alloy motorcycle hub is sequentially carried out oil removal cleaning, mechanical polishing, phosphating, remove surface dirt, oxide layer and impurities, obtain clean pretreatment hub;S2 primer spraying and solidification: on the surface of pretreatment hub, spray epoxy modified acrylic primer, control primer dry film thickness is 15-30 μm, after spraying, solidification treatment is carried out, obtain primer solidification hub;S3 sensitization and activation treatment: to primer solidification hub is sequentially carried out sensitization treatment, activation treatment, after treatment, using ultrapure water flush clean, obtain activated hub;S4 nanometer mirror surface spray plating: using double-end spray gun, A agent metal salt solution and B agent reducing agent solution are synchronously sprayed, A agent metal salt solution and B agent reducing agent solution are mixed at 15-25 cm from the surface of hub, and metal crystal layer is deposited on the surface of hub.

This invention discloses a method for preparing a cobalt-free black glaze for heat-resistant cookware and its decorative product. The method includes the following steps: First, raw materials are weighed according to the following mass percentages: cuprous oxide 21-39%, alumina 13-29%, silicon dioxide 32-65%, iron oxide 0.6-3.0%, and manganese oxide 0.3-2.0%. After being mixed evenly, the mixture is placed in a crucible and melted at high temperature. The melt is then water-quenched to obtain a black glass frit. Next, the black glass frit is dried, pulverized, and sieved to obtain black glass powder. Then, the black glass powder is mixed with water at a mass percentage of 100%:50-65%, and kaolin and a suspending agent or dispersant are added. The mixture is ball-milled evenly to prepare the glaze. The glaze obtained in step three is applied to the surface of a bisque-fired spodumene-based heat-resistant cookware blank. After drying, it is fired at 1210-1260℃ for 0.5-3 hours to obtain a black glaze layer. This invention has a simple process, low cost, and can be mass-produced, with broad application prospects.