5 results about "Nitrosylsulfuric acid" patented technology

The invention discloses a method for preparing p-trifluoromethoxyphenol by adopting a micro-channel reactor, and belongs to the field of fine chemical engineering. 4-trifluoromethoxyaniline and dilute sulphuric acid are pumped into the first micro-channel reactor for a reaction; then introducing inert gas, pumping the nitroso sulfuric acid solution, and carrying out diazotization reaction to obtain a diazonium salt solution; pumping the diazonium salt solution into a second micro-channel reactor, carrying out hydrolysis reaction, adding dichloroethane extract liquor into a rectifying tower after the reaction is ended, and rectifying to obtain p-trifluoromethoxyphenol; porous baffles which are inclined downwards are arranged on the inner wall of the rectifying tower in a crossed manner; a heat-conducting filler layer of 50-100 nm is arranged on the porous baffle plate; the heat-conducting filler layer is a three-dimensional net-shaped material layer which is formed by boron nitride nanosheets / titanium oxide nanorods and has a porous structure. The method is simple in process route, convenient to operate, high in controllability, high in safety, high in reaction efficiency, high in product yield, capable of effectively reducing the solid waste amount in production, energy-saving, environment-friendly and suitable for industrial production.

This application relates to the field of denitrification technology, and discloses a denitrification device for nitrifying sulfuric acid and a flue gas acid production system. The denitrification device includes: a denitrification reactor, which includes: a denitrification reactor body, which is provided with a nitrifying sulfuric acid inlet, a sulfur dioxide inlet, and a waste gas outlet, and the denitrification reactor body defines a reaction space; the reaction space is used to carry out a denitrification reaction on a mixture including nitrifying sulfuric acid and sulfur dioxide to remove nitrosylsulfuric acid from the nitrifying sulfuric acid to obtain first sulfuric acid, wherein the mass concentration of sulfuric acid in the mixture is 93% to 98%; a heater is disposed inside the denitrification reactor body for heating the mixture. Using this denitrification device to treat nitrifying sulfuric acid is low-cost and environmentally friendly.

The invention discloses a method for continuously preparing p-fluorophenol, which comprises the following steps of: salifying p-fluoroaniline and dilute sulphuric acid in a first static mixer, diazotizing the salified solution and nitroso sulfuric acid in a second static mixer to form a diazonium salt solution, injecting the diazonium salt solution and an extracting solvent into a pressurized tower reactor for hydrolysis, according to the present invention, the reaction process is simple and efficient, the whole-process continuous production can be achieved, the production risk is low, the controllability is good, the three wastes are less, the pollution is less, the investment is low, the product p-fluorophenol is rapidly separated by using the thin film flash evaporation, and the method is suitable for industrial production. The thermal decomposition of the product under the condition of high temperature and long time is obviously reduced, the total yield of the prepared p-fluorophenol is 90% or above, and the purity is 99.5% or above.

The application relates to the technical field of flue gas purification and chemical engineering, and discloses a dry absorption device and a flue gas acid-making system. The dry absorption device comprises an absorption tower and a denitration assembly connected with the absorption tower. The absorption tower comprises a demisting catcher. The denitration assembly comprises a denitration reactor. The denitration reactor comprises a denitration reactor body. The denitration reactor body is provided with a nitrate sulfuric acid inlet, a sulfur dioxide inlet and a waste gas outlet. A reaction space is defined in the denitration reactor body. The reaction space is used for making a mixture comprising nitrate sulfuric acid and sulfur dioxide to perform a denitration reaction, so as to remove nitrous sulfuric acid in the nitrate sulfuric acid and obtain first sulfuric acid. The mass concentration of sulfuric acid in the mixture is 93% to 98%. A heater is arranged in the denitration reactor body and used for heating the mixture. The dry absorption device can effectively eliminate the problem of the demisting catcher being blocked in the absorption tower. Meanwhile, the quality of finished acid can be greatly improved.

The utility model discloses a multistage rotary plate spray tower absorption device for preparing nitroso sulfuric acid, which belongs to the technical field of waste gas treatment and comprises a multistage spray system, spray towers, a gas conveying pipeline, spray units, rotary plates, a water tank and a drying tower. The gas conveying pipeline between the adjacent spray towers is a Z-shaped baffling pipeline, the center lines of the adjacent spray towers are arranged in a mutually offset manner, the rotating plates are fixedly mounted in the spray towers, each stage of spray tower is independently and fixedly connected with the spray unit, the total end of the spray unit is fixedly connected with the water tank, and the last stage of spray tower is connected with the drying tower through the gas conveying pipeline.