67 results about "Urea" patented technology

An engine controller determines the cost of operating a combustion engine and the cost of operating an emissions after-treatment device. Accordingly, the engine controller adjusts parameters for operation of the engine and the after-treatment device to ensure cost-effective use of the engine and the after-treatment device while complying with exhaust emissions requirements. In particular, the engine controller receives the price of fuel consumed by the engine and the price of reductant used by the after-treatment device to determine the respective cost of operation. Specifically, the fuel is diesel fuel used in a diesel engine; the reductant is urea use in a urea-based Selective Catalytic Reduction (SCR) system; and the regulated exhaust emissions is nitrogen oxide (NOx) emissions. The engine operating parameters may include cooled exhaust gas recirculation airflow, fuel injection timing, fuel injection pressure, and air-to-fuel ratio. The SCR system operating parameters may include the volume of urea injected.

A one-step process for preparing both cyanuramide and the ammonium hydrogen carbonate/sodium carbonate and ammonium chloride features that the synthetic amonia is directly delivered to the cyanuramide preparing step, where it is preheated to 350-400 deg.C and used as gas carrier of fluidized bed, and the gas from liquid urea washing tower is divdied into two channels, one returning back to crystallizer and used as cold gas and another being directly used to prepare ammonium hydrogen carbonate/sodium carbonate and ammonium chloiride. Its advantages are low cost and high catalytic efficiency.

A method of selection for type II methanotrophs is provided that includes enriching a microbial feedstock using a non-sterile bioreactor with a methane source and a nitrogen source, where the microbial feedstock includes a mixture of Type I and Type II methanotrophic cells, where an inhibited growth of the Type I methanotrophic cells and an enhanced growth of the Type II methanotrophic cells forms. The method further includes exposing intermittently the enriched microbial feedstock to i) nitrate, ii) urea, or i) and ii), where enhanced growth of the Type II methanotrophs is established, and exposing the Type II methanotrophs to an unbalanced growth condition where production of polyhydroxybutyrate is induced.

An exhaust gas treatment device comprises a casing and a tail gas treatment module located inside the casing, wherein the casing comprises a mixing cavity, a splitting cavity and a distributing cavity; the exhaust gas treatment device further comprises a conical mixer located inside the mixing cavity and a mixing pipe located in the splitting cavity, and the conical mixer comprises a plurality of conical swirl plates and a plurality of openings corresponding to the conical swirl plates. Therefore, on one hand, urea can be laid on the pipe wall of the mixing cavity so as to increase the evaporation area and dwelling time of the urea and improve the mixing effect; on the other hand, exhaust gas can flow more smoothly, the local pressure loss can be reduced, and the back pressure can be reduced.

In a process for the production of urea, substantially pure ammonia and carbon dioxide are reacted in a reaction space (1) from which comes out a reaction mixture subjected to stripping (2) to obtain a partially purified mixture sent to a urea recovery section (3, 4, 7, 8). From the recovery section (3, 4, 7, 8) it is obtained a dilute carbamate solution, which is subjected to stripping (9) with recycling of vapors to the reaction space (1) after condensation (6). This process achieves high conversion yield with reduced energy consumption and low implementation costs.

A urea solution apparatus for a vehicle may include a urea solution storage tank installed in a side of a lower part in a rear part of a car body, and a urea solution pipe configured to inject a urea solution into the urea solution storage tank, wherein the urea solution pipe is connected to the urea solution storage tank in such a way that a urea solution injection nozzle of the urea solution pipe is located in a space in which a fuel inlet hole is provided.

The invention provides a multifunctional organic/inorganic compound fertilizer and a preparation method thereof. The compound fertilizer is composed of the following raw materials by weight percent: 25-30% of urea, 5-10% of monoammonium phosphate, 10-18% of potassium sulphate, 27-32% of humic acid, 1.5-3% of zinc sulfate, 0.1-0.3% of microorganism bacterial liquid, 12-20% of diatomite and 1.9-2.7% of sophorolipid, wherein humic acid is obtained from decomposed coal through activation treatment. During preparation, urea, monoammonium phosphate, potassium sulphate, humic acid, zinc sulfate, microorganism bacterial liquid, diatomite and sophorolipid are added to a mixing crusher for crushing, so that a powdery mixture is obtained; the powdery mixture is added to a drum coating-pelleting-drying-cooling integrated machine to be pelleted, dried and cooled so that a granular mixture is obtained; the microorganism bacterial liquid and the diatomite are mixed and then sprayed to the mixture so that a crude product of the multifunctional organic/inorganic compound fertilizer is obtained; and finally, the crude product is added to a vibrating sieve for screening and then the obtained oversize is the multifunctional organic/inorganic compound fertilizer.

The invention relates to a germicide for treating fruit tree putridness, which is prepared by mixing 200-400 portions of 25% hydrogen peroxide, 2-5 portions of glacial acetic acid, 5-10 portions of Chinese medicinal herb extract, 5-10 portions of ultramide and 0.01-0.05 portion of indoleacetic acid, wherein the Chinese medicinal herb extract can be capsule of weeping forsythia, flavescent sophora root, or spatholobus stem extract.

The invention discloses an online diesel exhaust fluid solution concentration monitoring system for an automobile SCR (Selective Catalytic Reducer) system. The online diesel exhaust fluid solution concentration monitoring system comprises a power module, a coil design module and a data acquiring and processing module, which are sequentially connected through SMA (SubMiniature version A) connectors, wherein the coil design module comprises a transmitting coil, a urea tank and a receiving coil; the urea tank is used for being filled with a urea solution; the transmitting coil and the receiving coil are arranged at the outer side of the urea tank; the transmitting coil is connected with the power module through the SMA connector; the receiving coil is connected with the data acquiring and processing module through the SMA connector. The online diesel exhaust fluid solution concentration monitoring system avoids the contact between the measuring coil and the urea solution, adopts a self-resonance mode of the coil, and improves the sensitivity of the voltage at the two ends of the coil on change of concentration of the urea solution. The invention further discloses a monitoring method of the online diesel exhaust fluid solution concentration monitoring system for the automobile SCR system.

The invention discloses a pyridine.benzene thiamethoxam acyl fertilizer, which is prepared from pyrazosulfuron with herbicidal activity, mefenacet pesticide and a nitrogen fertilizer carrier by combination, wherein the weight ratio of the pyrazosulfuron to the mefenacet is 1-(20-30); and the nitrogen fertilizer carrier is composed of urea, ammonium chloride and packing. The production method of the fertilizer is also disclosed by the invention; water is taken as a solvent; fertilizer granules are prepared by a spray coating method; and the production method is short in technological process, small in environmental pollution, stable in quality, and good in application prospect; the obtained fertilizer granules are suitable for fertilizing and weeding of a paddy field, and the targets of saving work, time and labor can be achieved.

The invention discloses a thermoplastic starch-polyvinyl alcohol composite plastic film, and relates to the technical field of film production. The composite plastic film is made by using the following raw materials, by mass, 80-100 parts of (self-made) thermoplastic starch, 40-55 parts of polyvinyl alcohol, 10-15 parts of acrylic acid, 5-10 parts of benzoyl peroxide, 7-12 parts of oxidized polyethylene wax, 4-8 parts of hydroxyethyl cellulose, 5-12 parts of calcium stearate, 5-15 parts of iron oxide, 3-6 parts of gelatin, 5-10 parts of urea, and 8-15 parts of polyethylene glycol. The composite plastic film made in the invention reserves the good biodegradation performance of starch and effectively improves the mechanical performances of a plastic film, and a covalent bond introduced due to the addition of a cross-linking agent can substitute a hydrogen bond in order to improve the mutual crosslinking among starch, polyvinyl alcohol and other raw material molecules.

The invention relates to the technical field of inorganic materials, and discloses a preparation method for a ferrous carbonate/graphene composite material. The preparation method comprises the steps of: I. mixing graphene materials, water-soluble ferrite, urea and water to form a suspension, wherein the mass ratio of the graphene materials to the water-soluble ferrite is (0.02-0.2):1, and the amount-of-substance concentration ratio of the urea to the water-soluble ferrite is (20-100):1; II. putting the suspension into a reaction kettle, controlling the temperature to be 100-180DEG C, and carrying out hydrothermal reaction for 4-12h to obtain the ferrous carbonate/graphene composite material. The invention further provides a lithium ion battery prepared by taking the ferrous carbonate/graphene composite material as a negative electrode material. By being synthesized through low-temperature hydrothermal reaction, the ferrous carbonate/graphene composite material is high in specific capacity and good in cycling performance, and has excellent development prospects after being applied to the negative electrode materials of the lithium ion battery.

The invention is to disclose a medicine of external use for treating skin disease And its preparation method, said medicine includes materials according to part by weight as follows: egocort 6-9 ; camphor 80-120;menthol 80-120;triamcinolone acetonaide acetate 8-12;carbamide 800-1200;aspirin 440-4400.

The invention discloses a method for preparing a bamboo mat used for external cable packaging. The method includes the following steps that branches and leaves of bamboo are removed, the bamboo is split to form bamboo chips, and the bamboo chips are dried to obtain pretreated bamboo; the pretreated bamboo is placed into a hydrochloric acid solution and subjected to standing, then filtering and natural air drying are conducted, and a product is placed into a sodium hydroxide solution and subjected to standing, so that a material A is obtained; the material A is carbonized, and then a product is delivered to a hot press to be flattened to form a material B; and the material B is delivered into an ethanol solution, cocamidopropyl betaine and butyl titanate are added into the ethanol solution and stirred, hydrochloric acid, urea, citric acid complexing silver nitrate and microcrystalline wax are added, and then heated stirring, filtering, washing, drying and knitting are conducted, so that the bamboo mat used for external cable packaging is obtained. The method can completely kill bacteria and eggs in bamboo and effectively soften a bamboo fiber bundle, so that the stability of the formed bamboo mat in use is guaranteed; meanwhile, the sterilization and antibacterial effects of bamboo fibers are effectively improved, the bamboo fibers are prevented from absorbing moisture and gas in air, and the effects of corrosion prevention and deformation prevention are achieved.

The invention relates to chemical production equipment and a process, in particular to a supercritical carbon dioxide extraction process flow in combination with a urea production system. The process flow is characterized by forming a fluid source compressor set for supercritical carbon dioxide extraction by combining an original or new carbon dioxide compressor in the urea production system according to the process conditions of supercritical carbon dioxide extraction: singly using the carbon dioxide compressor operating in the urea production system, or singly using the standby carbon dioxide compressor, or singly using the new carbon dioxide compressor or selecting to use one of the different combinations of the three kinds of carbon dioxide compressors to compress and use surplus carbon dioxide in the system as the supercritical fluid source of supercritical carbon dioxide extraction and introducing the surplus carbon dioxide into a supercritical carbon dioxide extraction system to form the supercritical carbon dioxide extraction process flow. The process flow fully uses the surplus material and human resources, improves the production efficiency, reduces the disposable investment, lowers the operation, maintenance and management cost and realizes energy saving, emission reduction and consumption reduction.

The invention relates to a double-cyclone urea mixing device. The wall of a mixing cylinder is fixed with an injection base, and a front cyclone partition plate and a rear cyclone partition plate arefixed in the mixing cylinder; the front end part of a cyclone mixing pipe is fixed with the front cyclone partition plate, and the rear end part of the cyclone mixing pipe is fixed with the rear cyclone partition plate; front cyclone holes are formed in the front cyclone partition plate between the cyclone mixing pipe and the mixing cylinder, and front cyclone lugs are fixed on the front wall surface of the front cyclone partition plate corresponding to the positions of the front cyclone holes; rear cyclone holes are formed in the rear cyclone partition plate between the cyclone mixing pipe and the mixing cylinder, and rear cyclone lugs are fixed on the front wall surface of the rear cyclone partition plate corresponding to the positions of the rear cyclone holes; and the cyclone mixing pipe is provided with a flow guide opening, and a flow guide fin is fixed on the excircle of the cyclone mixing pipe corresponding to the position of the flow guide opening. The invention has the advantages of ingenious and efficient structure, full mixing of ammonia gas and tail gas, mixing time saving, great improvement of gas mixing efficiency and guarantee of tail gas treatment effect.

The invention relates to a lime nitrogen multifunctional particle type soil amendment and a preparation method thereof. The soil amendment raw material comprises the following components: lime nitrogen, auxiliary materials and hot melting adhesives, wherein the auxiliary materials contain brown coal, fulvic acid and zeolite powder, wherein the hot melting adhesives contain urea, polyphosphoric acid and solid paraffin. The lime nitrogen and the auxiliary materials are mixed uniformly and are heated to 80-90 DEG D by heating, the hot melting adhesives are added and heated to 115-125 DEG C, after uniformly stirring, a steel band type granulator is used for granulation and condensation, and the lime nitrogen multifunctional particle type soil amendment is obtained. According to the invention, the composite hot melting adhesives are used as water-retaining agent and chelating agent, the auxiliary materials are used as neutralizer, activator and synergist; after continuous granulation, the product has a low water content, thereby solving the volatilization problem of the lime nitrogen; the prepared lime nitrogen multifunctional particle type soil amendment has a high biological energy and good application effect.

The invention relates in particular to a reservoir for a urea-based reducing agent, with an integrated electric heating element, usable on a heat engine vehicle for pollution control. The heating element (10) provided to thaw the reducing agent (6) is placed inside a cavity (16) delimited by a bowl (13), itself placed inside the reservoir (1). The cavity (16) of the bowl (13) communicates with the inner volume (5) of the reservoir by a valve (20). A suction pipe (12) for the reducing agent is submerged in the cavity (16) of the bowl (13), the starting point (18) of said pipe being situated near the heating element (10). Operation is thus guaranteed when the vehicle is under sloping and inclined conditions, and also in case of freeze.

The invention relates to the technical field of sewage treatment, in particular to a method for producing organic fertilizer from wastewater produced in a process for extracting chlorophyll from silkworm excrement. The organic fertilizer is prepared from raw materials as follows: 80.47-88.9 parts of silkworm excrement wastewater, 1-3 parts of urea, 0.3-1.2 parts of potassium fulvate, 0.3-1.5 parts of enzymes, 1-2 parts of compound amino acid, 0.2-0.3 parts of multivitamins, 0.1 parts of nitrogen fixing, phosphate solubilizing and potassium releasing bacteria, 0.1 parts of trichodermin, 0.1 parts of polypeptin, 0.1 parts of phytohormone, 3-10 parts of silkworm excrement micro powder, 3-6 parts of an emulsifier, 0.2-1 part of a thickening agent and 0.4 parts of a preservative. The wastewater produced in the process for extracting the chlorophyll from the silkworm excrement is utilized as the raw material and contains multiple nutritive substances capable of being absorbed by plants, so that the problem that a large amount of wastewater produced in the process for extracting the chlorophyll from the silkworm excrement is difficult to treat is solved, meanwhile, the water resource is saved, and requirements of energy conservation and environmental production are met.

The invention discloses a diminazene aceturate production method. The method comprises the following steps: reacting p-nitrobenzamide with triethylamine and thionyl chloride to synthesize p-nitrobenzonitrile, and carrying out addition, amination, reduction, diazotization, coupling and salt formation on p-nitrobenzonitrile to obtain diminazene aceturate. P-nitrobenzamide is adopted as a raw material to synthesizes p-nitrobenzonitrile, so high temperature reaction is avoided, and industrial production is facilitated; the addition of urea in the diazotization and coupling reactions is in favor of improving the yield; a reaction product obtained after the coupling reaction undergoes water supply and direct pH adjustment without filtering, heating, dissolving or cooling steps, so the reaction steps are simplified, and the reaction time is shortened; and water and methanol are used as solvents in the salt formation, so the volatilization of methanol is reduced, and the crystal form of diminazene aceturate is obviously improved.

The invention discloses a low-temperature denitrification catalyst, which comprises a carrier and active components supported on the carrier, wherein the carrier is titanium dioxide, the active components are cerium and neodymium, and a molar ratio of cerium to neodymium to titanium is (0.1-0.3):(0.2-0.4):1. The invention further discloses a preparation method of the low-temperature denitrification catalyst, wherein the preparation method comprises: respectively dissolving formula amounts of cerium nitrate, neodymium nitrate and a titanium source with deionized water, completely mixing to obtain a mixed precursor solution, adding 4-6 wt% of urea, and stirring uniformly to obtain a catalyst combustion liquid; slowly heating the catalyst combustion liquid to a temperature of 250-400 DEG C inan air atmosphere, and maintaining the temperature for 0.5-2 h to obtain an initial product; and calcining the initial product for 4-6 h at a temperature of 400-550 DEG C to obtain the low-temperature denitrification catalyst. According to the present invention, the prepared low-temperature denitrification catalyst has characteristics of high denitrification activity, good nitrogen selectivity, strong water resistance, and strong sulfur dioxide resistance; and the preparation method has characteristics of simplified preparation process, low energy consumption, high utilization rate, environment protection and no pollution.

The invention belongs to the field of medicinal chemical synthesis and in particular relates to a method for preparing 4-amino-2,6-dihydroxypyrimidine by virtue of a dry frying process. The method forpreparing 4-amino-2,6-dihydroxypyrimidine by virtue of the dry frying process comprises the following concrete steps: by taking sodium methoxide dry powder, urea and methyl cyanoacetate as raw materials, reacting under certain conditions, heating at a certain temperature, steaming out generated methanol, and finally generating 4-amino-2,6-dihydroxypyrimidine. According to the invention, yield of4-aminopyrimidine obtained through cyclization reaction can reach 80-85%, and product purity is more than 99%. Compared with a liquid-phase cyclization method, the method provided by the invention hasthe advantages that reaction yield can be improved by more than 15%, reaction period is reduced to be 2-3 hours from the original more than 8 hours, and no water methanol is produced, so that pollution of organic wastewater is greatly reduced, preparation cost and energy consumption of 4-amino-2,6-dihydroxypyrimidine are greatly reduced, and the method provided by the invention is hopeful to being applied to industrial production.

The invention discloses organic fertilizer for improving soil. The organic fertilizer is prepared from the following raw materials in parts by weight: 50 to 60 parts of clay, 20 to 26 parts of ammoniated lignite, 16 to 21 parts of beef bone powder, 14 to 18 parts of wheat bran, 26 to 31 parts of soybean meal, 17 to 22 parts of refined bentonite, 10 to 14 parts of turf, 30 to 45 parts of water hyacinth, 11 to 15 parts of lignin, 9 to 13 parts of humic acid, 16 to 20 parts of calcium, magnesium, phosphorus and potassium fertilizer, 7 to 9 parts of zinc oxide, 7 to 9 parts of calcium chloride, 7 to 9 parts of ammonium chloride, 12 to 16 parts of urea, 13 to 18 parts of ferrous chloride and 4 to 8 parts of brassinolide. After the organic fertilizer for improving the soil, disclosed by the invention, is applied to a sand land, the soil can be improved after the organic fertilizer permeates into the land; meanwhile, nutrients of the fertilizer are slowly absorbed by crops and the organic fertilizer has the advantages of remarkable soil improvement effect, promotion of growth of the crops, greenness and environment protection.