3097 results about "Liquid ammonia" patented technology

The invention relates to a system for comprehensively utilizing LNG cold energy for power generation and cold supply. The system comprises a LNG supercharging gasification direct expansion power generation system, a mixed working medium Rankine cycle power generation system, a liquid ammonia refrigeration house cold supply system and an ethylene glycol ice storage bath air conditioner cold supplycirculation system. The cold energy released in the LNG gasification process is utilized; high-grade electric energy is generated through LNG supercharging gasification direct expansion power generation and mixed working medium Rankine cycle power generation; cold is supplied to a refrigeration house through the cold energy released in the LNG gasification process for ammonia recycling; and cold is supplied to an air conditioner through the cold energy released in the LNG gasification process for ethylene glycol ice storage bath recycling. By means of the system, gradient utilization of the LNG cold energy is achieved, and the cold energy utilization efficiency is high.

The invention relates to a method for synthesizing taurine, comprising the following steps: (1) according to the amount ratio of materials of 1:1 to 1:1.2, epoxy ethane and sodium bisulfite are subjected to addition reaction under 0.05 to 0.1MPa, with pH value of 6.5 to 7.5 and at a temperature between 75 and 85 DEG C to form hydroxyethyl sodium sulfonate; (2) the hydroxyethyl sodium sulfonate and liquid ammonia are subjected to ammonolysis reaction under 14 to 21MPa and at a temperature between 160 and 280 DEG C to generate sodium taurate, and the mass concentration of ammonia in the reaction liquid is 20 to 30 percent; and (3) neutralization: namely, the sodium taurate is neutralized by sulphuric acid to generate the taurine. The method for synthesizing the taurine has the advantages of short time, high yield and lower cost, and is easy for industrialized production.

The invention relates to a method for preparing taurine, comprising the following steps: epoxy ethane and sodium bisulfite are reacted under 0.05 to 0.1MPa, with pH value of 6.5 to 7.5 and at a temperature between 75 and 85 DEG C to form hydroxyethyl sodium sulfonate; the hydroxyethyl sodium sulfonate and liquid ammonia are subjected to ammonolysis reaction at under 14 to 21MPa and at a temperature between 160 and 280 DEG C to form ammonolysis solution containing sodium taurate; and the ammonolysis solution is evaporated to remove ammonia, neutralized by sulphuric acid, concentrated, crystallized, separated, pre-dried in a boiling drying device or a vibration fluidization drying device, and then added into a microwave drying device to be dried and sterilized to obtain the taurine. The method for synthesizing the taurine has the advantages of short time, high yield and lower cost, and is easy for industrialized production. The water content of a taurine wet product can be reduced to below 0.30 percent through combined application of pre-drying of the boiling drying device or the vibration fluidization drying device and microwave drying, and simultaneously the device has the function of sterilizing.

The invention relates to a process of producing small molecular weight polyether amine by a continuous method. A continuous method fixed bed process is adopted, polyether, liquid ammonia and hydrogen are used as raw materials, 2-6 reactors which are fixed bed reactors or tubular reactors are connected in series and each reactor is internally filled by a Raney metal catalyst or a supported metal catalyst, respectively; under the reaction condition of certain temperature, pressure and molar proportion, the raw materials are sequentially reacted through the reactors to obtain polyether amine, the molecular weight of which is 100-1000. The process provided by the invention is simple in step. Multiple reactors and a compound catalyst system are adopted, so that the influence of generated water in the reaction to the catalyst efficiency is effectively reduced, and the yield and the conversion ratio of reaction are improved.

The invention discloses a gasification wastewater disposing method and device through single-tower pressurizing stripping, which comprises the following steps: entering the extracted of acid gas or ammonia gas of cold and hot coal gasification wastewater from band lateral line in the stripping tower from top and upper top; blending gas; dividing phases; washing; separating light oil and acid gas; preparing liquid ammonia through two-grade concreting and refining; separating crude phenol and organic solvent from bottom of tower through inversed-extracting autoclave liquid and organic solvent; recycling organic solvent through stripping. The gasification disposing device contains oil acid gas/ammonia stripping tower, extracting tower, acid gas washing tower, solvent stripping tower, solvent recycling tower, oil-water separator, dephlegmator, pump and reservoir.

Energetic materials, such as nitrocellulose, TNT, RDX, and combinations thereof, optionally in combination with chemical warfare agents, such as mustard gas, Lewisite, Tabun, Sarin, Toman, VX, and combinations thereof, are destroyed when chemically reacted according to the method of the invention. The method comprises reacting the energetic materials and chemical warfare agents, of present, with solvated electrons which are preferably produced by dissolving an active metal such as sodium in a nitrogenous base such as anhydrous liquid ammonia.

The invention discloses a boiler denitration control method based on outlet NOx content control and a system thereof. Two PID controllers are used to adjust an ammonia spraying amount so as to finally control a NOx content of a boiler outlet. During a control process, an inlet flue gas NOx flow E needs to be determined in real time and the E satisfies the following equation: E=DFGA*D, wherein the D is the NOx content (concentration) of the boiler inlet; the DFGA is an inlet flue gas amount; and the DFGA satisfies the following equation: DFGA=x*F(x). An output signal of a second PID controller is u2. The u2 expresses an opening degree of an ammonia spraying regulating valve. The opening degree of the ammonia spraying regulating valve is adjusted according to the u2 and the boiler denitration control is realized. The boiler denitration control method based on the outlet NOx content control and the system are easy to perform. Liquid ammonia consumption and a chimney NOx concentration can be greatly reduced.

The invention provides a method for modifying cotton and long vegetable fiber or yarn by ammonia liquid, which comprises the following steps: firstly, drying pre-treatment of raw materials; secondly, ammonia leaching of the raw materials in a hermetical treatment tank; thirdly, spin-drying of the raw materials subjected to ammonia leaching when a creel is twirled; fourthly, drying of the raw materials subjected to spin-drying by ammonia flow when the creel rotates slowly; fifthly, flushing of the raw materials which are dried by the ammonia flow by airflow when the creel rotates slowly; and so on. The method keeps the inherent advantages of the cotton, the long vegetable fiber and the yarn, overcomes the defects of the cotton, the long vegetable fiber and the yarn, increases softness, crimp tendency and fluffiness of the cotton, the long vegetable fiber and the yarn, improves the dye-uptake rate, the leveling property and the showy dye level, and further solves the problems of energy conservation, efficiency improvement and environmental protection.

The invention discloses a technology for preparing liquefied natural gas and liquid ammonia by using coke oven gas. The coke oven gas is subjected to the steps of compression, purification, methanation, cryogenic separation and liquefaction of synthetic natural gas, variable pressure adsorptive separation and liquid ammonia preparation with hydrogen rich gas, so that the liquefied natural gas (LNG) of which methane purity is more than 99 percent and the liquid ammonia reaching national first level standard are obtained. By the technology, the hydrogen byproduct of the coke oven gas for preparing the LNG is fully utilized; effective ingredients of the coke oven gas such as H2, N2, CH4, CO and CO2 are furthest utilized; the CO and the CO2 are methanated, so that the yield of the CH4 is improved by about 1/3; the liquefied CH4 is used as the LNG and sold; and the rest nitrogen-containing hydrogen-rich gas is used as a raw material for synthesizing ammonia, so that the additional value of the coke oven gas is improved, and reliable raw material guarantee is provided for developing downstream products with high additional values and prolonging the product chain.

The invention discloses a method used for producing sulfur-based urea compound fertilizer from ammonia desulphurization by-products. The method comprises following steps: sulfur dioxide-containing tail gas is delivered into a desulfurizing tower; ammonium hydroxide or liquid ammonia is sprayed so as to absorb sulfur dioxide, ammonium sulfite is oxidized with air, and an obtained product is subjected to concentration so as to obtain an ammonium sulfate slurry, and the ammonium sulfate slurry is subjected to solid-liquid separation so as to obtain an ammonium sulfate wet material; the ammonium sulfate wet material is delivered into a molten urea groove via a conveyor, solid urea is delivered into the molten urea groove via another hopper, and an obtained mixture is subjected to heating melting, or liquid urea is added directly; fluidization granulation is carried out, wherein dried seed crystal is delivered into a fluidized bed through one end, and is driven to flow to the other end of the fluidized bed in the fluidized bed; a mixed ammonium sulfate-urea composite solution is pumped into the fluidized bed, and multistage spraying is carried out; the sulfur dioxide-containing tail gas is delivered into the fluidized bed or/and fluidized drying with hot air is carried out, and semi-finished product sulfur-based urea compound fertilizer is obtained via seed crystal growth; and a obtained fluidization tail gas is subjected to dust separation, and is delivered into an ammonia desulphurization tower. According to the method, ammonium sulfate low in additional value is changed into sulfur-based urea high in additional value at low investment and operation cost.

The invention discloses a method for suppressing and slowing coking in ethylene cracking furnace tube comprising the steps of, (1) atmosphere processing, using the gaseous mixture produced from liquid ammonia decomposition as reducing gas to process the boiler tube atmosphere, (2) alloying treatment, preparing the alloy powder and adhesive into pulp, coating onto the surface of the processed furnace tube, drying and solidifying at 50-120 deg. C, placing into heating-furnace for diffusion treatment, cooling the furnace tube after the completion of the treatment, and removing the alloy powder coating on the furnace tube surface.

A fracturing fluid that includes the combination of liquid ammonia and a proppant, and a method for fracturing an underground formation by pumping this fracturing fluid into a wellbore that extends to the formation. The process includes generating pressure in the wellbore, creating fractures in the formation using the liquid or gelled ammonia and proppant slurry, and releasing pressure from the wellbore. The ammonia released from the liquid or gelled ammonia helps stabilize clays in the formation and the proppant helps to maintain the fractures in the formation.

The invention discloses a pure cotton bleached thermal smelting adhesive lining with extremely low washing shrinkage. The adhesive lining is characterized in that the warp-wise and zonal washing dimensional change rate is larger than or equal to minus 0.5%; the quantity of the formaldehyde released by the interlining is less than or equal to 35mg/kg; and the peeling strength is larger than or equal to 12N; the warp-wise and zonal dry heat dimensional change rate is larger than or equal to minus 0.8%. The production method of the invention comprises the following steps in sequence: overedging,singeing, bleaching, stoving, re-bleaching, liquid ammonia finishing, shrink resistant finishing, powder point coating and compressive shrinkage. The invention has the following advantages: the warp-wise and zonal washing dimensional change rate is large; the peeling strength is high; the environmental-friendly performance is good; and the production method can be easily operated.

The invention discloses a method for recycling and reusing all components of an LED-MOCVD (Light Emitting Diode-Metal Organic Chemical Vapor Deposition) preparation process tail gas through pressure swing adsorption in a whole temperature process. The method comprises procedures of pretreatment, medium-temperature pressure swing adsorption concentration, variable-temperature adsorption purification, pressure swing adsorption (PSA) hydrogen refining, hydrogen purification, condensation, freezing or ammonia gas distillation, liquid ammonia gasification, pressure swing adsorption ammonia extraction and ammonia gas purification, and hydrogen or ammonia-containing waste gases of the LED-MOCVD preparation process are purified till standards of electron-scale hydrogen (of which the purity is greater than or equal to 99.99999%v/v) and an electron-scale ammonia gas (of which the purity is greater than or equal to 99.99999%v/v) used in the LED-MOCVD preparation process, then recycling and reuseof waste gases are achieved, the hydrogen yield is greater than or equal to 75-86%, and the ammonia gas yield is greater than or equal to 70-85%. By adopting the method, the technical difficulty thata normal-pressure or low-pressure waste gas in the LED-MOCVD preparation process cannot be recycled or reused in the LED-MOCVD preparation process can be solved, and blanks of green and circular economic development of the LED industry can be made up.

The invention belongs to the technical field of coal chemical industry and particularly relates to a process for coproducing gasified synthetic ammonia and liquefied natural gas (LNG). The invention provides a method and equipment for coproducing the LNG and the synthetic ammonia by using raw coal gas generated by a high-temperature entrained bed; the desulphurization and the decarbonization are carried out by using a mature and advanced physical and chemical absorption process, methane is obtained by using an advanced methanation conversion technology, then, a deep cooling technology is adopted to produce liquid methane and hydrogen through staged cooling and washing separation, the produced liquid methane is outputted as a product, i.e. the LNG, meanwhile, the produced hydrogen is mixed with nitrogen to form a synthetic gas, and the synthetic gas is conveyed to an ammonia synthesizer for the production of the synthetic ammonia after the cold energy is recovered. The coproduction of natural gas and liquid ammonia is achieved, the equipment has corresponding capability for load adjustment, and the emission of vent gas in synthesis is not needed, so that the raw coal gas is maximally used in the production of products.

The invention provides a non-iron finish method for pure cotton or polyester fabrics. The non-iron finish method for pure cotton or polyester fabrics is characterized in that the technological processes sequentially include fabric preparing, liquid ammonia finishing, acid washing, pre-softening, preshrinking, moist crosslinking agent applying through a foaming machine, storage reacting, washing, tentering and forming, preshrinking and inspecting and packaging; the concentration of an acid catalyst MC1 in auxiliaries for the acid washing process is 50g/l, the pH valve of a cloth cover is controlled to be 4-5, and the cloth cover is then subjected to alkaline neutralization to control the pH value to be 6-7; and the foaming machine is used to apply a moist crosslinking agent, the moist crosslinking agent comprises the following components according to weight ratio: 220-260g/l of resin carboxymethyl cellulose (CMC), 110-130g/l of catalyst MC1, 20-30g/l of fiber protective agent HDP, 10-30g/l of softening agent RPU-N, 1-2g/l of hydrochloric acid and the balance of water, the temperature of a drying room is controlled between 80-100 DEG C, the temperature of the cloth cover is controlled between 35-40 DEG C, the humidity of a doffing is between 6-8%, and finally, the fabrics are wound on the doffing.

The invention discloses a semi-continuous preparation method of poly p-phenylene terephthalamide resin which comprises the steps of, proceeding pre-polycondensation to p-phenylene diamine and part of the paraphthaloyl chloride into the dissolvent architecture of solvent and assisting solvent, charging in pre-polymerization member and the remaining paraphthaloyl chloride powder into double bolt extrusion machine, letting in dried liquid ammonia to neutralize the hydrogen chloride gas produced in the reaction, and charging macromolecular addictive polyvinylpyrrolidone into the double bolt extrusion machine to obtain the polymer.

The invention provides a production method for continuously synthesizing polyether amine through a static bed, and relates to the technical field of gydrogenated (amination) ammoniation of polyether polyol, long-chain fatty alcohol or aromatic alcohol compounds. The method comprises the steps of carrying out uniform spray mixing on polyether polyol and liquid ammonia and then mixing the mixture with hydrogen; carrying out hydrogen-present ammoniation reaction on a static bed reactor containing nickel/copper/lanthanum-loaded activated framework catalyst at the temperature 130 DEG C-280 DEG C and at the pressure of 3.0MPa-15.0MPa; and carrying out gas-liquid separation on reactants, dehydrating and deaminating a liquid material by virtue of an evaporator, continuously discharging, thereby obtaining polyether amine. The production method disclosed by the invention is a production method for continuous synthesis of polyether amine, which easily realize automation control.

The method of comprehensively utilizing phosphate fertilizer by-product includes utilizing ammonium fluoride solution of 3-14% concentration to absorb side product fluorine containing tail gas ammonium fluorosilicate solution; adding iron scrap or iron salt to fluorosilicic acid as one other by-product to eliminate phosphorus; adding liquid ammonia, ammonia water or ammonium bicarbonate; filtering, washing, and eliminating silica precipitate; returning ammonium fluoride solution to phosphate fertilizer absorbing system, concentration and drying to obtain ammonium hydrogen fluoride; reacting solid ammonium hydrogen fluoride and sulfuric acid at high temperature to obtain HF gas, absorbing HF gas to obtain hydrofluoric acid, purification and condensation to obtain anhydrous HF; and mixing the mixture of ammonium sulfate and ammonium bisulfate with ammonium bicarbonate or ammonia in a mixer, curing and crushing to ammonium sulfate fertilizer.

An o-chloroaniline production method takes o-nitrochlorobenzene as raw material and is characterized in that the o-nitrochlorobenzene is dissolved in alcohol solvent in the presence of catalyst and additive and reacted with hydrogen at 10-120 DEG C and under 0.3-4.0 MPa; the reaction process is continuous reaction; after the completion of the reaction, the o-chloroaniline is obtained through treatment, wherein, the catalyst can be selected from one of the following: Ni/Al2O3, Raney Ni, Pt/C and Pd/C; while the additive can be selected from one, or two, or three of the following compounds: cyclohexylamine, ethylenediamine, ethanolamine, diethanolamine, triethanolamine, pyridine, liquid ammonia, ammonium bicarbonate, ammonium carbonate, sodium carbonate, sodium bicarbonate, potassium bicarbonate, potassium carbonate, potassium hydrogen phosphate, potassium dihydrogen phosphate, sodium hydrogen phosphate and sodium dihydrogen phosphate; the dosage of the catalyst takes up 0.05% to 20% of the mass of the o-nitrochlorobenzene; the dosage of the additive takes up 0. 5% to 20% of the mass of the o-nitrochlorobenzene; the alcohol can be methanol or ethanol; the dosage of alcohol takes up 30% to 150% of the dosage of the o-nitrochlorobenzene; the continuous reaction is realized through 1 to 6 tank reactors which are connected in series.

The invention provides a cellulose fiber liquid ammonia dyeing method, which concretely comprises: adopting a cation modification agent and NaOH to treat cellulose fibers, sequentially carrying out hot water washing, cold water washing and acid washing, carrying out water washing to achieve a neutral state, and drying to obtain cationization cellulose fibers; and dissolving a dye capable of being dissolved in liquid ammonia in liquid ammonia, and immersing the prepared cationization cellulose fibers into the liquid ammonia dyeing solution to dye under a certain condition to obtain the dyed subject, wherein the condition comprises that a dye use amount is more than or equal to 10% (o.m.f), a bath ratio is more than or equal to 1:20, and a dyeing time is more than or equal to 20 seconds. With the present invention, problems of high production process energy consumption and heavy water pollution in the existing cellulose fiber dyeing are solved, a dye uptake rate and a color fixation rate of the dye in liquid ammonia dyeing are increased, a dye use amount is saved, advantages of less dyeing process steps, short dyeing time, recycling of dyed dye, environmental pollution reduction, and the like are provided, and waterless dyeing requirements during a fiber dyeing process can be achieved.