219 results about "Ammonium carbamate" patented technology

The present invention relates to a variety of conductive ink compositions comprising a metal complex compound having a special structure and an additive and a method for preparing the same, more particularly to conductive ink compositions comprising a metal complex compound obtained by reacting a metal or metal compound with an ammonium carbamate- or ammonium carbonate-based compound and an additive and a method for preparing the same.

The present invention relates to a variety of conductive ink compositions comprising a metal complex compound having a special structure and an additive and a method for preparing the same, more particularly to conductive ink compositions comprising a metal complex compound obtained by reacting a metal or metal compound with an ammonium carbamate- or ammonium carbonate-based compound and an additive and a method for preparing the same.

The invention discloses a latent epoxy resin curing-foaming agent and a method for preparing the same and belongs to the technical field of plastic additives. A commercialized amine curing agent for epoxy resin is utilized to absorb and fix carbon dioxide, so as to synthesize a series of novel alkyl ammonium carbamate compounds or alkyl ammonium carbonate compounds. The alkyl ammonium carbamate compounds or the alkyl ammonium carbonate compounds are stable at normal temperature and can release carbon dioxide gas and the amine curing agent again when heated, so as to effectively foam and cure the epoxy resin, and the latent epoxy resin curing-foaming agent is environmentally friendly.

The invention relates to a polyurethane foam material with carbon dioxide as an environment-friendly latent foaming agent. The latent foaming agent is prepared from, by weight, 50-90 parts of polyether polyol, 10-50 parts of dihydroxyethyl ammonium carbamate, 125-212 parts of isocyanate, 2-5 parts of foam stabilizer and 0.5-1 part of catalyst. The preparing method of the polyurethane foam material includes the following steps that dihydroxyethyl ammonium carbamate is prepared; polyether polyol, dihydroxyethyl ammonium carbamate, foam stabilizer and catalyst are added into a plastic beaker to obtain a uniform mixture; isocyanate is added, and foaming is carried out freely at the normal temperature. The preparing method has the advantages that diethanol amine reacts with carbon dioxide to fix carbon dioxide so as to prepare dihydroxyethyl ammonium carbamate, the dihydroxyethyl ammonium carbamate serves as the environment-friendly latent foaming agent to prepare rigid polyurethane foam, which achieves environment protection and environment friendliness, and the rigid polyurethane foam is good in performance.

The invention discloses a method for preparing a SiBCN(O) ceramic material, which relates to a method for preparing a multivariate ceramic material and solves the problems of high cost, poor safety and complicated operation of an organic precursor method for preparing the SiBCN ceramic material. The method comprises the following steps of: stirring a mixture of a silicon source, a boron source and a solvent for 48-60 hours in a reaction kettle and then adding ammonium carbamate; raising the temperature in the reaction kettle, preserving the temperature and cooling; carrying out vacuum filtration to obtain a SiBCN quaternary ceramic precursor; pyrolyzing the SiBCN quaternary ceramic precursor for 1-3 hours under the condition of inert gas shielding; and cooling the pyrolyzed precursor to room temperature to obtain the SiBCN(O) ceramic material. The process of preparing the SiBCN(O) ceramic material has no drastic exothermic reactions, the reactions are mild, and operations are simple. Raw materials adopted by the method have low toxicity, low price, low manufacturing cost, no influence on the health of operating personnel and good safety.

The invention discloses an olive-shaped ternary material precursor and a preparation method and application thereof, A lithium ion battery cathode material belong to that technical field of lithium ion battery cathode materials, NixCoyMnzCO3, wherein 0 & lt; x & lt; 1, 0 & lt; y & lt; 1, 0 & lt; z & lt; 1, x+y+z=1, the length of the olive-shaped ternary material precursor is 6-25 mu m, the diameter is 3-15 mu m, the shape of the olive-shaped secondary particles is olive, and the olive-shaped secondary particles are compactly superposed. The preparation method of the precursor provided by the invention can not only prepare an olive-shaped nickel-cobalt-manganese ternary carbonate precursor material with uniform particle size, By controlling the reaction parameters, polyvinylpyrrolidone, polyethylene glycol or polyacrylamide as dispersant, ammonium carbamate, urea, biuret, triuret, acetylurea or diacetylurea as precipitant, the olive-like secondary particle size of the precursor can be easily controlled. A large amount of sodium hydroxide and ammonia wat are not required to be consume, that cost is relatively low, and the process is more environmentally friendly.

A system and method for acid gas separations using porous frameworks of metal atoms coordinatively bound to polytopic linkers that are functionalized with basic nitrogen ligands that expose nitrogen atoms to the pore volumes forming adsorption sites. Adjacent basic nitrogen ligands on the metal-organic framework can form an ammonium from one ligand and a carbamate from the other. The formation of one ammonium carbamate pair influences the formation of ammonium carbamate on adjacent adsorption sites. Adsorption of acid gas at the adsorption sites form covalently linked aggregates of more than one ammonium carbamate ion pair. The acid gas adsorption isotherm can be tuned to match the step position with the partial pressure of acid gas in the gas mixture stream through manipulation of the metal-ligand bond strength by selection of the ligand, metal and polytopic linker materials.

The present invention relates to a process for preparation of silver oxide with various shape and size using a silver complex compound having a special structure. The present invention includes 1) step of preparing a precursor solution including a silver complex compound obtained by reacting a silver compound with one or more mixture selected from the group consisting of an ammonium carbamate-based compound, an ammonium carbonate-based compound or an ammonium bicarbonate-based compound in the presence of a solvent; and 2) step of preparing silver oxide by reacting the precursor solution including the silver complex compound of step 1) with an oxidant. The shape and particle size of the silver oxide prepared according to the preparation process of the present invention can be changed.

The invention relates to a method for generating ammonium bicarbonate by using ammonia water to absorb carbon dioxide in flue gas. The method divides a spray tower into two stages. Flue gas in the first stage of the spray tower contacts 6 to 18 percent of ammonia water in a converse manner to generate ammonium carbamate or ammonium carbamate and ammonium carbonate; in the second stage of the spray tower, the flue gas contacts absorption liquid coming from the bottom of the first stage of the spray tower and containing ammonium carbamate and ammonium carbonate in a converse manner to further generate ammonium bicarbonate. At last, the gas is discharged from the top of the tower. The method has the advantages of greatly reducing the content of ammonia in the flue gas from which CO2 is removed, secondary pollution as well as operation cost.

The invention discloses a gas self-production agent, a use of the gas self-production agent, and a self-produced gas foam acidizing method for oil wells and water wells. The gas self-production agent can produce gas in an acid environment or at an oil well bottom temperature. An active ingredient of the gas self-production agent is ammonium carbamate. The gas self-production agent has the advantages of low requirement on gas production conditions, large gas yield, simplification of foam acidizing processes for oil wells and water wells, reduction of a foam acidizing cost, and improvement of acidizing effects.

The invention relates to the field of urea production, and particularly relates to a urea synthesis device and a urea synthesis method. The urea synthesis device comprises a horizontal condenser and a horizontal reactor, wherein the inlet of the horizontal condenser receives liquid ammonia and an ammonium carbonate solution from a high-pressure ammonia pump and a high-pressure ammonium carbamate pump and ternary-substance series mixed gas of NH3, CO2 and water from a stripping tower, the liquid ammonia, the ammonium carbonate solution, the ternary-substance series ternary system mixed gas of NH3, the CO2 and the water enter the horizontal condenser for condensation and generate chemical reaction, and NH3 and CO2 react to generate ammonium carbamate; the horizontal reactor is connected with the horizontal condenser and used for dehydrating ammonium carbamate to generate urea; the stripping tower is connected with the horizontal reactor and a CO2 compressor and is used for heating, decomposing and stripping a mixed urea solution from the horizontal reactor so that the ammonium carbamate is decomposed into the NH3 and the CO2 and free NH3 and CO2 and water are stripped out. The urea synthesis device provided by the invention enhances the urea synthesis transformation ratio and reduces the energy consumed for conveying material, the construction investment and the urea production cost by adopting the horizontal reactor and the horizontal condenser.

The invention belongs to the field of urea preparation, and particularly relates to an energy-saving urea production system and a production process thereof. The system comprises a CO2 compressor, an ammonium carbamate pump, a liquid ammonia pump and a urea synthesizer. The system is characterized in that the CO2 compressor is connected with the ammonium carbamate pump and the liquid ammonia pump, the liquid ammonia pump is connected with the urea synthesizer, a falling-film countercurrent medium-pressure decomposing tower and a heater, an ammonium carbamate condenser, an ammonium carbamate separator, a three-stage medium-pressure absorption tower and an evaporative ammonia refrigeration recoverer, a liquid ammonia buffer tank, an inert gas scrubber, a tail-gas ammonia cleaning fine purifier, a low-pressure decomposing tower and a heater, a dimethyl liquid preheater, a horizontal low-pressure absorber, a falling film type pre-evaporator, a one-stage evaporator and a one-stage evaporative condenser, a two-stage evaporator and a two-stage evaporative condenser, and a process wastewater desorption and hydrolysis tower are sequentially connected behind the urea synthesizer in sequence. The energy-saving urea production system has the advantages of low investment, low energy consumption, simple operation, high elasticity and the like, thereby the process technology has considerable economic benefit and social benefit.

A system and method for acid gas separations using porous frameworks of metal atoms coordinatively bound to polytopic linkers that are functionalized with basic nitrogen ligands that expose nitrogen atoms to the pore volumes forming adsorption sites. Adjacent basic nitrogen ligands on the metal-organic framework can form an ammonium from one ligand and a carbamate from the other. The formation of one ammonium carbamate pair influences the formation of ammonium carbamate on adjacent adsorption sites. Adsorption of acid gas at the adsorption sites form covalently linked aggregates of more than one ammonium carbamate ion pair. The acid gas adsorption isotherm can be tuned to match the step position with the partial pressure of acid gas in the gas mixture stream through manipulation of the metal-ligand bond strength by selection of the ligand, metal and polytopic linker materials.

Systems and methods for producing urea are provided. A method for producing urea can include exchanging heat from a syngas comprising hydrogen and carbon dioxide to a urea solution comprising urea and ammonium carbamate. The heat transferred can be sufficient to decompose at least a portion of the ammonium carbamate. In one or more embodiments, the syngas can be reacted with liquid ammonia to provide a carbon dioxide lean syngas and an ammonium carbamate solution. The ammonium carbamate solution can be heated to a temperature of about 180° C. or more. At least a portion of the ammonium carbamate in the heated ammonium carbamate solution can be dehydrated to provide the urea solution.

The invention discloses a preparation method of a peel-off type bentonite supported silver phosphate catalyst. The preparation method comprises the steps of adding dry bentonite powder to a cation surface active agent solution, stirring and standing to form a cation modified bentonite suspension; dissolving ammonium carbamate in methyl alcohol and adding silver oxide, stirring and gradually dissolving the silver oxide to form an organic complex of silver; adding the organic complex of silver into the cation modified bentonite suspension, stirring, performing precipitating separation and drying; putting the dried product in a microwave oven, and carrying out microwave irradiation; and adding the product irradiated by microwave to a phosphoric acid solution, stirring, performing precipitating separation and drying to obtain a peel-off type bentonite supported silver phosphate catalyst. As the bentonite is in a peel-off state, a large bentonite inner surface area becomes an external surface area; the silver phosphate supported on the surface is easily illuminated in a photo-catalytic process and easily contacted with organic matters to be processed, so that mass transfer is facilitated.

The invention relates to a method for forming self-assembly inhibitory film on surface of a copper electrode, belonging to the corrosion prevention technology of nonferrous metals; the method comprises the following steps: adopting analytical purity ammonium pyrrolidine dithiocarbamate (APDTC) to prepare 0.001-0.01mol/L of APDTC water solution, and immersing a pretreated copper electrode in the solution at 20-30 DEG C for 0.5-8h to absorb a layer of APDTC self-assembly inhibitory film on the surface of the copper electrode. Alternating current impedance test results show that the inhibition efficiency of the copper electrode which is treated through self-assembly in 0.01mol/L of APDTC water solution for 4-8h, in 0.5mol/L of HCl solution can reach above 95%.

The invention relates to a method for synthesizing cyanic acid or melamine by utilizing ammonia gas and carbon dioxide. The method comprises the following steps: directly reacting by taking ammonia gas and carbon dioxide as raw materials or taking ammonium bicarbonate, ammonium carbonate and ammonium carbamate as the raw materials in the presence of a catalyst or no catalyst under the conditions that the temperature is 200-300 DEG C and the pressure is 0-30MPa to obtain a cyanic acid or melamine product. By using the method disclosed by the invention, a series of problems during the synthesis process of urea are avoided, synthesis production cycle energy consumption, consumption of manpower and physical resources of cyanic acid or melamine are reduced, and production cost is lowered.