12 results about "Dinitrogen monoxide" patented technology

The invention belongs to the field of chemical engineering manufacturing industry, and relates to equipment and a method for producing cyclic ketone compounds by oxidizing cycloolefin by using waste gas produced by adipic acid. Raw material gas A containing nitrous oxide from an adipic acid production process production line can be subjected to oxygen removal, so that the oxygen content is less than 100ppm; the raw material gas A containing nitrous oxide from the adipic acid production line can also be purified into purer gas containing 50-99% of N2O, and the purer gas is used for reacting with the cycloolefin compound; the reaction equation is CnH2n-2 (cycloolefin) + N2O (nitrous oxide)-> CnH2n-2O (a product cyclic ketone compound) + a byproduct + N2 superscript (nitrogen), wherein n is a positive integer from 4 to 24. The device is stable in consumption quota, low in production cost and high in economic benefit compared with the prior art.

Embodiments herein relate to recycling of used lithium battery materials. In some aspects, a method may include suspending a lithium source in a solvent containing an oxidizing agent to extract lithium, forming an extracted lithium solution, separating the extracted lithium solution from residual solids of the lithium source, purifying the extracted lithium solution by precipitating and filtering impurities, and precipitating lithium in the purified lithium solution to produce lithium carbonate (Li2CO3). In some embodiments, the method may also include pre-treating the lithium source to improve the kinetics of the lithium extraction. In some embodiments, the pretreatment may include a cutting or comminution step to reduce the size of the lithium source. In some embodiments, the lithium source may include lithium ion battery waste. In some embodiments, the oxidizing agent may include sodium persulfate (Na2S2O8), potassium persulfate ((NH4) 2S2O8), ammonium persulfate (NH4) 2S2O8, hydrogen peroxide (H2O2), ozone (O3), and / or nitrous oxide (N2O).

The present invention relates to a process for removing nitrogen oxides, nitrous oxide and carbon monoxide from a gas stream (1), comprising: (a) oxidizing nitric oxide in the gas stream to form nitrogen dioxide by adding an oxygen-containing gas (3) to the gas stream (1), thereby obtaining a nitric oxide-depleted gas stream, and washing the nitric oxide-depleted gas stream with water (7) to obtain a nitric oxide-depleted gas stream (11) to remove nitrogen oxides from the gas stream (1); (b) oxidizing at least a portion of the carbon monoxide in the nitrogen oxide-depleted gas stream (11) to form carbon dioxide, thereby obtaining a carbon monoxide-depleted gas stream (19); (c) converting nitrous oxide in the carbon monoxide-depleted gas stream (19) to nitrogen and oxygen if the carbon monoxide-depleted gas stream (19) does not contain carbon monoxide, or converting nitrous oxide in the carbon monoxide-depleted gas stream to nitrogen and oxygen and / or carbon dioxide if the carbon monoxide-depleted gas stream (19) still contains carbon monoxide, or converting nitrous oxide in the carbon monoxide-depleted gas stream (19) to nitrogen and oxygen and / or carbon dioxide if the carbon monoxide-depleted gas stream (19) still contains carbon monoxide; to obtain a purified tail gas stream (25).

The invention relates to the technical field of gas impurity removal, and discloses a metal modified molecular sieve as well as a preparation method and application thereof. The method comprises the following steps: (1) mixing a metal salt, a nitrogen-containing micromolecule complexing agent, a nitrogen-containing micromolecule dispersing aid and ethanol to obtain a mixed solution, and then adding a molecular sieve for mixing to obtain a mixture; (2) drying the mixture obtained in the step (1), and then roasting; wherein the metal in the metal salt is selected from at least one of Mg, Ca, Sr and Ba; the nitrogen-containing micromolecule complexing agent is selected from at least one of 2-nitrophenol, 3-nitrophenol and 4-nitrophenol. The metal modified molecular sieve prepared by the method has very high adsorption activity on nitrous oxide, oxygen-enriched liquid air containing nitrous oxide is treated, the content of nitrous oxide can be reduced to 5 ppm or below, and the whole process is low in energy consumption, does not generate new impurities, and is green and environment-friendly.

To suppress generation of harmful substances when using ammonia as fuel in a control device and method for an internal combustion engine.SOLUTION: In an internal combustion engine having a fuel supply passage for supplying ammonia as fuel to a combustion chamber and a reformer that reforms ammonia to hydrogen by using heat of exhaust gas, when a load is raised by increasing the amount of ammonia, if thermal efficiency deteriorates, ignition timing is delayed, and when a concentration of dinitrogen monoxide in exhaust gas or a correlation value correlated with the concentration of the dinitrogen monoxide in exhaust gas reaches a preset determination value, the delay of the ignition timing is finished.SELECTED DRAWING: Figure 1

[Problem] The present invention provides a dinitrogen oxide purification system, an internal combustion engine system, and a dinitrogen oxide purification method, which make it easy to obtain sufficient effects of decomposing or reducing dinitrogen oxide.[Solution] The dinitrogen oxide purification system 10 includes an intake section 14 and a purification section 1. The intake section 14 takes in dinitrogen oxide in the presence of coexisting O2 and / or H2O. The purification section 1 decomposes or reduces the dinitrogen oxide taken into the intake section 14.

In a method for producing nitric acid, nitrogen oxides are first created in an ammonia combustion plant (2) by burning ammonia with primary air and are cooled in a condenser (3), thereby producing a solution containing nitric acid. The solution containing nitric acid is then supplied to at least one absorption tower, (4, 5), in which the nitrogen oxides are brought into contact with water and oxygen, the nitrogen-containing gas mixture reacting at least partially with the water and the oxygen, forming an aqueous solution containing nitric acid, which solution collects at the bottom of the absorption tower, (4, 5) and is then compressed and supplied back to the absorption tower (4, 5) via a line (13, 15, 21). To minimise the formation of dinitrogen monoxide during ammonia oxidation in such a plant and to increase the efficiency of the process, it is proposed in accordance with the invention to use a gas, the oxygen content of which is between 21.3 vol.% and 35 vol.% as an oxidant in the ammonia combustion plant (2). According to the invention, this oxidant is produced by introducing pure oxygen or an oxygen-rich gas into the primary air or into the ammonia combustion plant (2).

The gas decomposition device includes: a pipe through which a gas to be treated containing oxygen and dinitrogen monoxide flows; a first light source that irradiates an inside of the pipe with first light having a main emission wavelength of 160 nm or more and less than 200 nm; and a second light source that irradiates the inside of the pipe with second light having a main emission wavelength of 200 nm or more and less than 411 nm, in which the first light source and the second light source are disposed such that at least a part of the second light overlaps with at least a part of the first light, and decompose the dinitrogen monoxide.

Provided is a method for decomposing a treatment target gas, the method involving decomposing dinitrogen monoxide while suppressing emission of NOx.　This method is for decomposing a treatment target gas, the method comprising decomposing dinitrogen monoxide in the treatment target gas by providing, to the treatment target gas, energy for exciting a gas contained in the treatment target gas. The treatment target gas contains at least dinitrogen monoxide and carbon dioxide. The gas concentration of the carbon dioxide contained in the treatment target gas is higher than the concentration of each gas contained in the treatment target gas excluding the carbon dioxide.

To provide an exhaust gas purification catalyst for an ammonia engine, capable of purifying unburned ammonia (NH3) and / or nitrogen oxides (NOx) contained in exhaust gas during start-up of the ammonia engine, while suppressing emission of nitrous oxide (N2O).SOLUTION: An exhaust gas purification catalyst for an ammonia engine, comprises support particles 211 and a catalytic noble metal 212 supported on the support particles 211, wherein the support particles 211 comprise alumina support particles, and at least 90 mol% of the catalytic noble metal 212 is supported on the alumina support particles.SELECTED DRAWING: Figure 1

The present disclosure provides a method for reducing dinitrogen monoxide emission from a soil composition containing a nitrogenous fertilizer. The soil composition contains a base soil and the nitrogenous fertilizer. The method for reducing dinitrogen monoxide emission comprises mixing decomposed leaf matter with the base soil and adjusting the mixed proportion of the decomposed leaf matter to 50 vol% or more of the total of the base soil and the decomposed leaf matter.

To provide a dinitrogen oxide purification system, an internal combustion engine system, and a dinitrogen oxide purification method, which make it easy to obtain sufficient effects of decomposing or reducing dinitrogen oxide.SOLUTION: A dinitrogen oxide purification system 10 includes an intake section 14 and a purification section 1. The intake section 14 takes in dinitrogen oxide in the presence of coexisting O2 and / or H2O. The purification section 1 decomposes or reduces the dinitrogen oxide taken into the intake section 14.SELECTED DRAWING: Figure 2