45results about How to "Solve serious corrosion problems" patented technology

The invention provides a chemical stripping solution and a stripping method, belonging to the technical field of stripping. The chemical stripping solution comprises sulfuric acid, hydrogen peroxide and a water solution of corrosion inhibitors, wherein the corrosion inhibitors are organic matters containing nitrogen or sulfur and the like or are high-polarity organic compounds containing -COOR, -COOH, -CHO, triple bonds (Cis equivalent toC) or poly-hydroxy-OH and the like. The stripping solution has high stripping speed and can strip nickel and copper plated layers with thickness of 0.2mm within two minutes at an appropriate temperature.

The invention provides a polypropylene-based microcellular foaming wood-plastic composite material and a production method thereof, belonging to the technical field of a wood-plastic composite material. The polypropylene-based microcellular foaming wood-plastic composite material is characterized by being prepared from the following raw materials in parts by weight: 70 parts of polypropylene, 30 parts of low-density polyethylene, 30-70 parts of biomass powder, 3-7 parts of nanometer calcium carbonate, 2-8 parts of compatilizer, 0.5-2.5 parts of foaming agent and 2-8 parts of lubricant. The problem of severe corrosion of a material cylinder and a screw of an extruder can be effectively solved by adjusting the ingredient formula of the property components and the processing agents, so that the service life of the extruder is prolonged. Furthermore, the continuous and uniform microcellular foaming wood-plastic composite material is obtained, the material density is reduced, and the application range of the material is enlarged. Therefore, the biomass powder is widely recycled, the waste material is recycled, and the environment is protected.

The invention discloses a control method for cathode protection of high-voltage direct-current transmission grounding electrodes. Improvement is performed on the basis of a direct-current transmission project constant current control manner, according to forward current detection results of the grounding electrodes, first-electrode current value deviation changes to be positive and negative alternately, alternate cathode protection of the sending end and receiving end grounding electrodes is achieved, corrosion losses of the grounding electrodes are reduced, the service life of the grounding electrodes is greatly prolonged, and the problem that the grounding electrodes are seriously corroded due to unbalanced current and the like is solved. The existing high-voltage direct-current transmission project constant current control manner is used, the manner is finely adjusted, the investment cost of a control protection system is not increased, the corrosion losses of the grounding electrodes can be greatly reduced, the service life of the grounding electrodes is prolonged, and the control method can be applied to a practical high-voltage direct-current transmission project.

The invention provides a preparation method for an environment-friendly chemical deplating agent applied to copper plating and nickel plating. The environment-friendly chemical deplating agent is an aqueous solution comprising sulfuric acid, hydrogen peroxide and corrosion inhibitor, wherein the corrosion inhibitor is organic matter containing nitrogen or sulfur and the like or a high-polarity organic compound containing -COOR, -COOH, -CHO, triple bonds (C is equivalent to C) or multiple hydroxyl -OH and the like. In addition, potential differences exist between a cathode and an anode, the potential differences can be eliminated or reduced through the action of an electron-poor group and an electron-rich group of the organic matter, and therefore corrosion can be reduced or corrosion can be temporarily stopped. The deplating liquid is high in deplating speed, at the appropriate temperature, a 0.2 mm-thick nickel coating and a 0.2 mm-thick copper coating can be deplated within 2 minutes, and the waste deplating liquid obtained after deplating is completed facilities recovering of metal copper and nickel.

The invention belongs to the field of nuclear reactor engineering, in particular to a follower component driven by a driving mechanism in a pressure shell and a water reactor adopting the same. The invention realizes the spectral shift control of a reactor and compansates the decrease of reactivity in a burn-up process by a depleted uranium (or thorium) compound follower, and adopts a dense weir and residential uranium compound fuel postprocessed by partially utilizing natural uranium and spent fuel, thereby greatly saving nuclear fuel and decreasing fuel cycle cost. A driving mechanisms driving a great amount of follower components are arranged in the pressure shell, so as to prevent the joint sections of the driving mechanism from penetrating through the upper sealing head of the pressure shell, carry out the spectral shift control under the condition without influencing the reliability of the pressure shell, lower the boron concentration of the water reactor in water in an operation process, avoid the occurrence of the problem of serious corrosion of the joint sections and the upper sealing head of the driving mechanism due to the penetration of boric acid through the upper sealing head of the pressure shell, reduce the possibility of elastic rod accidents and improve the safety.

The invention belongs to the field of fine chemical engineering, and in particular relates to a method for clean preparation of an alkyl substituted diamine fluorene compound. The alkyl substituted diamine fluorene compound is prepared by taking 9-fluorenone and alkyl substituted aniline as raw materials and zirconium solid super acid as a catalyst for catalysis. The alkyl substituted diamine fluorene compound prepared by adopting the method provided by the invention has a yield of 85% and purity of 98.5-99.5%, a solvent after using can be recycled without further treatment, and the catalyst can be reused for more than 5 times. The method disclosed by the invention is mild in reaction condition, simple and convenient to operate, high in yield and low in cost, the three-waste quantity is greatly reduced compared with that of the conventional inorganic acid and organic acid methods, the environmental pollution is small, and meanwhile, and the problems of high energy consumption and low yield of other types of solid acid such as a multi-fluorine sulfonic acid polymer loaded aluminum oxide catalyst, ferric solid super acid, titanium solid super acid and tungsten solid super acid are solved, so that the method is a clean method suitable for large-scale industrial production.

The invention relates to a high-pressure splitting extrusion powder-mixing permeation-assisting in-situ remediation method for low-permeability polluted soil. The remediation method comprises the following steps: confirming a to-be-remedied area of soil; setting one or more remediation grids according to the size of the to-be-remedied area of the soil; arranging liquid injection wells at the four top corners of the repairing square grids; arranging an extraction well in the center of the repair grid; and mounting aliquid injection device at the liquid injection well, and mounting a negative pressure extraction device at the extraction well for liquid injection and extraction. Water and gas are injected into the polluted soil body through high-pressure jet grouting under high pressure, the original structure of the polluted soil body is destroyed, and a mud cake-shaped structure is formed, so that plant ash and sand are injected to be evenly mixed into the polluted soil body, the grain composition of the soil body is changed, and the permeability coefficient of the soil body is increased; and the chemical agent permeation rate is increased, the reaction rate and the permeation range are increased, the remediation range is increased, the remediation period is greatly shortened, the chemical agent dosage, the permeation path and the permeation range can be controlled, and secondary pollution is avoided.

The invention provides a catalyst used for preparing amino acid salt through low-temperature oxidative dehydrogenation by using amino alcohol, which uses Cu/ZrO2 as a main catalyst and Pd as a cocatalyst. The catalyst has good low temperature activity, high selectivity and stability and simple preparation conditions and can be used in industrial production of amino acid salt preparation. The aminoalcohol and alkali metal hydroxides are used as the raw materials to generate the amino acid salt through reaction in the presence of the catalyst under the conditions of low reaction temperature of140-180 DEG C and reaction pressure of 0.5-1.0MPa. The technical scheme adopted by the invention better solves the problem that the production equipment is severely corroded under the high temperatureand strong alkali reaction conditions.

The present invention relates to a process for preparing orthoformate by taking advantage of hydrocyanic acid, as by-product in production of acrylic nitrile, and apparatus therefore. The hydrocyanic acid, as by-product in production of acrylic nitrile, is adopted as a starting raw material and, together with alkyl alcohol and halogen hydride, is dissolved in an indifferent solvent; then after halogenation, salt forming and alcoholysis reactions, crystal separation and distillation rectification, the orthoformate is obtained. By adopting a reactor equipped with stirring, built-in plastics bundled tubes or metal dish tube heat interchanger to resolve the heat exchange problem existing in the aggregation exothermic halogenation and salt forming reactions, the present invention prevents blasting boiling and exploding accident states from appearing during the course of reaction, facilitates placidity and controllability of the reaction temperature, and achieves the requirement for safe reactions.

An electro-galvanizing brightening agent is characterized by comprising, in weight percentage, 49%-51% of 1-benzyl pyridinium-3-carboxylate, 19%-21% of choline chloride, 14%-16% of urea and 14%-16% of 2.4-dichlorobenzaldehyde. The electro-galvanizing brightening agent solves the problem of poor brightness of an alkaline electro-galvanized coating, and accordingly solves the problem that equipment is seriously corroded by current acid electro-galvanizing.

The invention provides a process and a system for producing ammonium sulfate by deaminizing coke oven gas with an ammonium sulfite method. The process for producing the ammonium sulfate by deaminizingthe coke oven gas with the ammonium sulfite method comprises the following steps of using ammonia in the coke oven gas and sulfur dioxide generated by sulfur paste, generated by the wet oxidative desulfurization on the gas with an ammonia method, or an acid gas, generated by desulfurization with an absorptive method, through incineration as raw materials, absorbing the ammonia in the coke oven gas by adopting an ammonium sulfite solution as a solvent, regenerating the ammonium sulfite solution through absorbing the sulfur dioxide in flue gas generated by the incineration of the sulfur paste or the acid gas, and converting ammonium sulfite generated by absorbing the ammonia and the sulfur dioxide into ammonium sulfate through oxidation. The problem that a device in a process of washing theammonium with sulfuric acid is seriously corroded is solved. According to the process, cooling water absorbs sulfur trioxide to generate the sulfuric acid which can be used for replacing sulfuric acid which is needed to be purchased when the ammonium sulfate is produced; and the resource is comprehensively utilized. The invention also discloses the system for producing the ammonium sulfate by deaminizing the coke oven gas with the ammonium sulfite method. The system has the advantages of being low in investment, low in energy consumption and easy to popularize.

The invention provides a flue gas pipeline, a preparation method of the flue gas pipeline and a waste incineration flue gas recovery device. The flue gas pipeline comprises a pipeline body and a Ni-Crnano coating, and the Ni-Cr nano coating is arranged on the inner surface of the pipeline body. The anti-corrosion performance of the surface of the waste incineration flue gas pipeline can be effectively improved through the Ni-Cr nano coating, therefore the problem that flue gas generated by waste incineration has serious corrosion to the flue gas pipeline is solved, and the stability and service life of flue gas recovery and purification device are increased.

The invention discloses a conveying hose system for a salt field. Conveying hoses are polyurethane hoses and are connected with a salt collecting vehicle, a pump on the salt collecting vehicle is connected with a transition pipe through a slewing bearing, the transition pipe is connected with the conveying hoses through a quick connector, and the two conveying hoses are also connected through a quick connector.

The invention discloses a method for preparing p-nitrobenzoic acid by using polystyrene foam, which comprises the following steps: (1) defoaming treatment; (2) microwave digestion; (3) catalytic oxidation; (4) product separation and purification. The present invention utilizes polystyrene foam to prepare the method for p-nitrobenzoic acid, which is simple and convenient to operate and easy to realize. It takes waste polystyrene foam as raw material and utilizes the method of nitric acid digestion and oxygen oxidation to turn waste into wealth on the one hand, The cost of raw materials is reduced, and on the other hand, the problem of severe corrosion caused by the direct use of nitric acid oxidation is effectively solved, and the product has high purity, high yield, and easy separation and treatment of the product.

The invention belongs to the technical field of corrosion resistance of plate heat exchangers, and provides a plate of a corrosion-resistant plate heat exchanger and a corrosion-resistant treatment method of the plate. A binding layer and a corrosion-resistant layer are sequentially sprayed on the surface of the plate; the binding layer is prepared from polyvinyl alcohol, xylene and talcum powder,wherein the mass ratio of the polyvinyl alcohol to the xylene to the talcum powder is 30:(5 to 10):(10 to 15). According to the corrosion-resistant plate heat exchanger, the surface of the plate andthe surface corrosion-resistant layer are tightly bound by the binding layer, so that the plate has the excellent property of acid-alkali corrosion resistance. The corrosion-resistant treatment methodhas the characteristics that the material price is low, manufacturing is easy and the property is stable.

A process for concentrating the wet-method phosphoric acid and other inorganic acids by vacuum (or ordinary-pressure) evaporation is disclosed. A certain quantity of kerosene or xylene is added to the concentrating tower while a certain temp is held. The diluted acid is dropped in the kerosene. In the falling procedure of acid drops, they suck heat from kerosene and evaporate along with the light component of kerosene. After condensed, the oil and water are naturally separated as the phosphoric acid is not soluble to kerosene. Said separated oil can be cyclically used.

An electronic device (200) and a control method of a USB Type C interface (201), which can solve the problem of severe corrosion of the USB Type C interface (201) in a standby state. The electronic device (200) includes a USB Type C interface (201), a switch assembly (202), a first signal path (203) and a second signal path (204); wherein, the USB Type C interface (201) is used to connect the USB Type C equipment (205); the switch assembly (202) is connected to the USB Type C interface (201); the switch assembly (202) is connected to the first signal path (203); the switch assembly (202) is connected to the second signal path (204); when the USB When the Type C interface (201) is connected to the USB Type C device (205), the first signal path (203) is connected to the USB Type C interface (201) through the switch assembly (202), and the first tube of the USB Type C interface (201) The level of the pin (201a) is the first level; when the USB Type C interface (201) was disconnected from the USB Type C device (205), the second signal path (204) was connected to the USB Type C device through the switch assembly (202). C interface (201), the level of the first pin (201a) of the USB Type C interface (201) is the second level; the first level is greater than the second level.