132 results about "Chemical equilibrium" patented technology

High-purity polysilicon granules are prepared by depositing reaction gas on silicon granules in a fluidized bed reactor having:

• • a reactor space comprising at least two zones lying one above the other, the lower zone weakly fluidized by introduction of a silicon-free gas into silicon granules in the lower zone by a plurality of individual dilution gas nozzles, and a second, reaction zone directly abutting the lower zone,

the reaction zone heated via its outwardly bounding wall,

introducing silicon-containing reaction gas as a vertical high speed gas jet into the reaction zone by reaction gas nozzle(s), forming local reaction gas jets surrounded by bubble-forming fluidized bed, gas decomposing leading to particle growth,

wherein the reaction gas has fully or almost fully reacted to chemical equilibrium conversion before reaching the wall or bed surface.

The invention discloses a low temperature Claus sulfur recovery process. The process mainly comprises a thermal reaction section, a catalytic reaction section and a tail gas incineration section, wherein in a combustion furnace of the thermal reaction section, partial hydrogen sulfide reacts with oxygen to be converted into sulfur dioxide, the hydrogen sulfide and the sulfur dioxide undergo a Claus reaction to generate sulfur, and process gas after sulfur separation enters the catalytic reaction section; in the reactor of each stage of the catalytic reaction section, the hydrogen sulfide and the sulfur dioxide under conventional Claus reaction, catalyst reactivation, sub-dewpoint and sub-solid point low temperature Claus reaction in sequence; after the catalyst reaction section, the tail gas which is subjected to sulfur separation enters the tail gas incineration section, and the tail gas is incinerated and exhausted in the tail gas incineration furnace. The process adopts a lower reaction temperature, contributes to performance of chemical equilibrium towards the direction of sulfur generation, so that conversion rate and recovery rate of sulfur are improved. Moreover, the process has the advantages of simple process flow, relative small equipment and investment, low operation cost and more contribution to environmental protection. The invention also discloses a device for the low temperature Claus sulfur recovery process.

A formulation of phenyloin suitable for topical application to a wound comprises a reservoir of phenyloin entrapped within a stabilising matrix, and an amount of dissolved phenyloin, wherein the dissolved phenyloin is in chemical equilibrium with the phenyloin entrapped within the stabilised matrix. The stabilised matrix may comprise a gel matrix, especially a gel matrix in which the polymer of the gel forms ion-pairs with the phenyloin. Also described are methods of treating a wound in diabetic and non-diabetic patients using a formulation according to the invention.

The invention belongs to the field of wastewater treatment technologies and resource recycling and relates to a device and method for recovering ammonia during wastewater treatment. In the invention, on the basis of chemical equilibrium and the difference of boiling points of NH3 and H2O, a principle that ammonia volatilizes and water does not volatilize when the temperature is controlled at 40-60 DEG C and the vacuum degree is controlled at 0.04-0.06MPa is adopted, and processes of vacuum and bubbling reinforced stirring and falling film heating are utilized under a lower temperature by utilizing a vacuum falling film bubbling and deaminizing device to enlarge the contact surface between a gas phase and a liquid phase and enhance the removal effect of ammonia nitrogen, and the volatilized ammonia is recovered by utilizing the negative pressure to avoid air pollution. By means of the method and the device disclosed by the invention, the advantages of high recovery rate, low energy consumption, convenience for operation and capability of continuous and intermittent production are achieved.

The invention relates to a preparation method of a plasticizer, particularly a preparation method of a plasticizer diethylene glycol dibenzoate, which comprises the following steps: heating benzoic acid and diethylene glycol until the benzoic acid is dissolved, adding a catalyst to carry out reflux reaction, starting a vacuum pump, heating to 200-220 DEG C, keeping the temperature to react under reduced pressure, and stopping the reaction when no water is distilled out, thereby obtaining a diethylene glycol dibenzoate crude product; and cooling the obtained diethylene glycol dibenzoate crude product, neutralizing with an Na2CO3 water solution to remove excessive benzoic acid, washing, separating out the ester layer, and dehydrating by vacuum distillation to obtain a colorless transparent oil liquid which is the plasticizer diethylene glycol dibenzoate product. The technique is simple, does not use any water-carrying agent, continuously distils out water in the reaction under negative pressure, breaks the chemical equilibrium of the esterification reaction, shortens the reaction time, greatly enhances the benzoic acid conversion rate, has the advantages of high esterification rate (up to higher than 98%), favorable catalyst selectivity, fewer side reactions, light product color and no need of activated carbon for decolorization, and is suitable for industrial production and environment-friendly.

The disclosure provides for a chemical reaction-based thermal management system and method. The system comprises a heat source for heating a first flow element, a heat exchanger for transferring heat from the first flow element to a reaction mixture flow, and a heat sink comprising one or more endothermic chemical reactions to absorb heat from the heat exchanger. The system further comprises a reactor element for approaching chemical equilibrium of the reaction mixture flow, a product removal element for removing one or more products from the one or more endothermic chemical reactions, and a plurality of driver elements for moving the first flow element and for moving the reaction mixture flow.

The object of the invention is to provide a method for synthesizing dichloropropanol with glycerin and hydrochloric acid. After pretreated industrial hydrochloric acid or pretreated industrial by-product hydrochloric acid or reagent hydrochloric acid is mixed with glycerin and catalyst in a batching tank, continuous Put it into a reactor equipped with a fractionation device on the top, continue heating under normal pressure for chlorination reaction, the temperature is controlled at 100-200°C, while continuously performing chlorination reaction, continuously distill the material in the reactor, and the product dichloro Propanol and water are continuously taken out from the reaction system after being condensed into liquid by the condenser; the same pretreatment method of industrial hydrochloric acid and industrial by-product hydrochloric acid of the present invention is to add one or more phosphorus-containing and/or sulfur-containing hydrochloric acid to the hydrochloric acid to be treated. Alkali metal and/or alkaline earth metal salts of inorganic acids, added in an amount of 0.1 to 15% of the weight of the hydrochloric acid to be treated, stirred at a temperature of 0 to 100°C for 0.5 to 15 hours; And the by-product hydrochloric acid provides a good outlet, which is conducive to reducing the production cost of dichloropropanol.

The invention discloses a real-time determining method and system for carbon content and a temperature value of molten steel in a steelmaking later stage. The method comprises the following steps of collecting spectral information of flame at the furnace mouth in real time in the steelmaking later stage; and inputting the spectral information into a pre-established second prediction model to obtain a real-time value of the carbon content and the temperature value of the molten steel, wherein the second prediction model is a real-time prediction model obtained due to training by taking the pre-acquired spectrum information and the carbon content and temperature value of the molten steel corresponding to the spectrum information as samples, taking the spectral information as input, and taking the real-time carbon content and temperature value of the molten steel corresponding to the spectrum information as output; and the real-time carbon content and temperature value of the molten steelcorresponding to the spectrum information is derived by using a material balance and chemical balance principle after obtaining the carbon content and the end temperature value of the end molten steel. The method and system provided by the invention can improve the prediction reliability and accuracy of the carbon content and temperature value of molten steel of small and medium-sized convertersin which the sub-gun cannot be installed.

The invention discloses a method which is suitable for softening and dealing with industrial circulating cooling water by micro-basification. Nanofiltration process equipment is adopted for removing the multivalent ions such as Ca<2+>, Mg<2+>, SO4<2+>, and the like, in the water and some Na<+> ions are preserved, or the combination of cation-exchange resin weak-acid and nanofiltration is adopted for removing the multivalent ions such as Ca<2+>, Mg<2+>, SO4<2+>, and the like, in the water and some Na<+> ions are preserved; anion resin of OH-type/CO3-type/HCO3-type is adopted for removing the left superacid anions in the water, and the superacid anions are exchanged by OH<->/CO3<2->/HCO3<->, and the producing water is alkaline. The alkaline producing water reacts with the CO2 in the air to realize chemical equilibrium, and dilute solution with buffering is formed, the pH value of the circulating cooling water is adjusted to alkalescency ranging from 8.3 to 9.2, and softening and micro-basification treatment of the circulating cooling water is realized. The method of the invention can realize that various additionally added chemical agents such as antiseptic, corrosion inhibitor, scale inhibitor, water stabilizer, bactericidal algicide, and the like, are avoided for use in the circulating cooling water system, and has the technical effects of corrosion prevention, scaling prevention and microbial contamination prevention as well as comprehensive economic benefit that discharge of enriched water and chemical substance is reduced.

A method for preparing high-purity isobutene from raffinate C4 by means of separation belongs to the technical field of isobutene preparation, and includes the steps: by combining a fixed bed reactor with a catalysis rectifying column and utilizing macro-porous sulfoacid cation exchange resin as catalyst, mixing C4 with water, then sequentially carrying out hydration reaction in a hydration reactor and a hydration rectifying column to generate tert-butyl alcohol, refining tert-butyl alcohol aqueous solution by a tert-butyl alcohol separating column, and sequentially carrying out dehydration reaction in a dehydration reactor and a dehydration catalysis rectifying column to generate the isobutene. The method adopting the catalysis rectifying technology breaks through chemical equilibrium limitations, conversion rate of the isobutene in the hydration reaction and the tert-butyl alcohol in the dehydration reaction is increased, selectivity of the isobutene in the hydration reaction and the tert-butyl alcohol in the dehydration reaction is enhanced, process is simplified, equipment investment cost is lowered, the catalysis reaction and a rectifying process are coupled, energy consumption during production is reduced, and operating cost is lowered.

The invention discloses a high-enthalpy shock tunnel total temperature measurement method and belongs to the technical field of wind tunnel tests. According to the invention, the sound velocity of theplenum gas is measured through the photoinduced transient grating spectrum technology, and then the temperature, namely the total temperature, of the plenum gas of the high-enthalpy shock tunnel is calculated through numerical iteration according to the plenum gas pressure of the high-enthalpy shock tunnel and the chemical equilibrium theory.

A method of forming an annealed high-K metal oxide transistor gate structure is disclosed. A metal oxide layer is formed over a semiconductor substrate. The metal oxide layer undergoes a buffered annealed process in an oxygen atmosphere to anneal the metal oxide layer at or below the thermodynamic chemical equilibrium of SiO/SiO₂ and at or above the thermodynamic chemical equilibrium of the metal oxide layer.

The invention provides a simulation and evaluation method and system for an under-salt dolomite water-rock reaction. The method comprises analyzing stratum water of a research area; stratum water classification is carried out by using a Sulin method; formulating experimental fluids, preparation of dolomite core sample, dolomite water rock reaction test is performed; the dolomite water-rock reaction is judged to reach chemical equilibrium; the method comprises the following steps: determining the fluid flow rate of the dolomite water rock reaction, carrying out the under-salt dolomite water rock reaction by using the prepared experimental fluid and a dolomite rock core sample, analyzing and calculating the changes of mineral components, corrosion and precipitation, and quantitatively evaluating the influence of the under-salt dolomite formation water on the corrosion and precipitation of the dolomite. According to the method, the quantitative evaluation of the reaction between the dolomite and the corresponding formation water under the geological background of the subsalt dolomite reservoir can be realized; the specific influence of stratum water attributes in the dolomite water-rock reaction process can be analyzed, control factors beneficial to formation and storage of under-salt dolomite pores are defined, and an analysis basis is provided for large-scale and efficient under-salt dolomite reservoir distribution and prediction.

The invention discloses a coal-fired boiler energy efficiency on-line monitoring method based on chemical balance. The coal-fired boiler energy efficiency on-line monitoring method comprises steps of monitoring a boiler working medium parameter, calculating to obtain boiler effective heat, monitoring a boiler smoke parameter, an ash parameter and a wind supply parameter, calculating total quantities of C,H and S which are generated through boiler combustion through chemical equilibrium, using combustion heat of C, H and S to calculate total heat inputted into the boiler, calculating heat efficiency of the boiler in real time according to effective heat and total heat of the boiler, and calculating boiler combustion efficiency in real time according to concentration of CO2 and CO. The beneficial effects of the coal-fired boiler energy efficiency on-line monitoring method are that: all data is obtained through testing online in real time, boiler heat efficiency can be calculated in real time through a chemical equilibrium theory, boiler heat efficiency and combustion efficiency can be monitored online, and a boiler real time energy efficiency level and a combustion level can be reflected accurately.

The present invention relates to a computational tool that allows to evaluate the degradation of cement-based materials under various types of chemical attacks such as sulfates, chlorides, and plain water. It is based on the physical principles of ionic mass conservation and chemical equilibrium between a solution and different solid phases. The effect of the dissolution or the precipitation of solid phases on the transport coefficients is considered. A method for determining an ion concentration in solution of at least two ions capable of undergoing transport in a cement-based material under a chemical attack and a solid phase profile for at least one component of said cement-based material is provided. A method for determining a diffusion coefficient for each of at least two ions capable of undergoing transport in a cement-based material is also provided.

The invention discloses a preparation method of N2O3, comprising the following steps: a) oxidizing the gases containing NO to generate a gas mixture basically formed by N2O4, NO2 and NO; and b) carrying out chemical balance adjustment on the gas mixture generated in the step a) to obtain a gas mixture basically formed by NO and NO2 in molar ratio of 1:1. The invention also provides a reaction device implementing the method, comprising i) a plug flow isothermal reactor and ii) a perfectly mixed isothermal reactor. The invention has the advantages of moderate operation conditions, short reaction time, high product purity, strong suitability to the raw materials, etc. The gas mixture generated by the method of the invention reacts with C1-C4 alkanol to obtain C1-C4 alkyl ester.

The invention discloses a faintly acid suspension liquid for removing anodic oxide film of titanium and titanium alloy, which is prepared by formula solid powder and distilled water by a mass ratio of 1:(0.2-1),wherein the Potential of Hydrogen (pH) is in a range between 3 and 6, fluorides of the formula solid powder are in an amount of 50wt.% to 80wt.% , solid acid is in an amount of 10wt.% to 50wt.%, stimulating materials are in an amount of 5wt.% to 50wt.%. A trace of Hydrogen Fluoride (HF) retreating film is produced on the basis of the principle of chemical equilibrium mobile on the faintly acid condition, therefore, the preparing method is simple and effective, convenient to refill, and has a continuous controllability , no erosion to matrixes and no harm to human bodies.

The invention provides a synthetic method of AMPS (2-Acrylamide-2-methylpropanesulfonic acid), which comprises the following steps of: contacting acrylonitrile and sulfuric acid with isobutene to generate a pasty product; and separating the pasty product to obtain AMPS. The method is characterized in that: at least part of acrylonitrile is from waste liquid produced during the process in which acrylonitrile is taken as a raw material to synthesize AMPS. According to the synthetic method of AMPS, provided by the invention, acrylonitrile waste liquid with a certain proportion is directly taken as a reaction solvent and a reactant for synthesizing AMPS, so that the process of rectification recovery is reduced or completely given up, and the energy consumption is greatly reduced; and simultaneously, as the acrylonitrile waste liquid contains a reaction byproduct, in terms of chemical equilibrium, the side reaction can be prevented from occurring. Thus, compared with the prior art, the method provided by the invention can improve the yield of the product of AMPS.