7results about "Nitrogen dioxide" patented technology

Disclosed is an apparatus for conversion of ammonia into oxides of nitrogen which may comprise an adiabatic burner (108), a set of platinum / rhodium alloy catalytic gauzes (102A), (102B), and (102C), a waste heat recovery boiler (WHRB) (110), an absorption tower (302A), (302B), (302C), (302D) and (302E), a NaOH tank (306) and a surge tank (304). Further, the adiabatic burner may be configured to carry out catalytic oxidation of air and ammonia, using catalytic gauzes (102A), (102B), and (102C) of platinum / rhodium alloy. Further, the mixture of air and ammonia may be selectively oxidized to oxides of nitrogen, which may be absorbed in an alkali medium in the absorption tower (302A), (302B), (302C), (302D) and (302E), to yield sodium nitrites and nitrates.

The invention discloses a production process and device for preparing liquid nitrogen tetroxide by recycling nitric oxide. Nitrogen oxides in the tail gas are respectively absorbed by water and alkali liquor to prepare a nitric acid solution and a sodium nitrate-nitrous acid solution; a dilute nitric acid solution and a sodium nitrate and nitrite solution are respectively stored and then mixed to enter a nitric oxide generation tower for reaction to generate nitric oxide gas and a sodium nitrate aqueous solution. The nitric oxide gas is lightly oxidized by using oxygen in the nitric oxide generation tower, then enters the oxidation absorption tower and is heavily oxidized by using concentrated nitric acid, so that the nitric oxide gas is completely converted into nitrogen dioxide gas, and the concentrated nitric acid is used for absorption at the upper section of the oxidation absorption tower to form fuming nitric acid. Fuming nitric acid is heated by steam, and liquid nitrogen tetroxide is produced after condensation. The non-condensable gas contains a small amount of nitrogen oxides, and then passes through a denitration device. By adopting the device and the process, the nitrogen oxide in the recovered waste gas can be effectively ensured to be prepared into liquid nitrogen tetroxide, and the content of the nitrogen oxide in the waste gas outlet is reduced.

The application relates to the technical field of nitrite synthesis, and discloses a synthesis method and a synthesis device of alkyl nitrite. The synthesis method comprises the following steps: firstly, mixing gaseous nitric oxide and gaseous oxygen to obtain a mixture through a first reaction; and then, mixing the mixture with alkyl alcohol to obtain alkyl nitrite through a second reaction. The synthesis method greatly shortens the reaction time, increases the yield of alkyl nitrite, does not have a complicated post-treatment process and a large amount of by-product nitric acid, and is beneficial to cost saving and time saving.

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.

According to a first aspect of the present invention, there is provided an apparatus for forming NOx from nitrogen and oxygen, the apparatus comprising: a gliding arc discharge, GAD, device arranged to generate a plasma; a passageway including an inlet for a feed gas comprising nitrogen and oxygen and an outlet for the NOx, wherein the passageway extends, at least in part, through the GAD device wherein, in use, the nitrogen and oxygen are reacted in the generated plasma, thereby forming the NOx from at least some of the nitrogen and oxygen; and a post-discharge container for adjusting the NO2 / NO ratio in the formed NOx to from 1:2 to 2:1.

The present disclosure provides a static mixer for mixing two or more fluids together. The static mixer comprises a tubular body defining a mixing chamber in which spheroidal bodies are positioned. The spheroidal bodies are arranged sequentially within the mixing chamber, and their size and shape is selected so that they maintain a staggered formation. The tubular body can receive a flow of the two or more fluids at one end and convey them towards an opposite end where a mixed product can be provided. The arrangement of the spheroidal bodies can induce turbulence in the flow of the two or more fluids to mix them as they meander around the spheroidal bodies. The present disclosure further provides a method for mixing two or more fluids by the static mixer.

The invention relates to the technical field of nitric acid production, in particular to an NO oxidation catalyst, application thereof and a nitric acid preparation method. According to the present invention, through the cooperation of the specific content of the palladium simple substance in the active component of the catalyst and the transition metal oxide, the high NO conversion rate of the catalyst at the temperature of 200-300 DEG C during the catalytic oxidation process of the high NO concentration process gas is ensured, the NO conversion rate attenuation rate is less than 0.01% / h, the NO oxidation reaction heat can be utilized to produce the by-product steam, and the production cost is reduced. The reaction heat is prevented from being cooled and wasted by circulating water, the water amount of circulating cooling water in a low-temperature section in the nitric acid process is reduced, high-grade heat byproduct steam can be effectively utilized, the heat recycling grade and the utilization rate in the nitric acid production process are improved, and huge economic value is achieved.