96 results about "Vapor pressure" patented technology

The invention provides a cross-adsorption-temperature industrial organic waste gas adsorbent type selection method and application, two or more model adsorption materials with concentrated pore size distribution are used, and filling type adsorption with high pore volume utilization rate can be formed in pores with a specific size or below due to adsorption of volatile organic compounds (VOCs) on a porous material; and a matching relation equation between the filling type adsorption critical aperture and the adsorption partial pressure and a rule of changing along with the adsorption temperature are explored. According to the method, the partial pressure is normalized relative to the saturated vapor pressure at the respective adsorption temperature, and the parameter saturated vapor pressure related to the adsorption temperature is introduced into an equation as a variable, so that an equation of critical pore diameters suitable for adsorption of VOCs at different temperatures and concentrations is established; and a cross-adsorption-temperature industrial organic waste gas adsorbent type selection method is formed. The method provided by the invention can provide a quantitative reference basis for development of VOCs efficient adsorption materials and technologies suitable for different adsorption temperatures.

The invention discloses a method for intensifying mass transfer by electrolyzed water driven bilateral air-blowing membrane distillation, which comprises the following steps: a three-chamber device is sequentially provided with a positive chamber, a negative chamber and a concentration chamber, the positive chamber and the negative chamber are separated by a nylon diaphragm, and the negative chamber and the concentration chamber are separated by a composite membrane; the method comprises the following steps: preparing materials, wherein an alkaline solution is used as electrolyte of an anode chamber and a cathode chamber; water molecule mass transfer: liquid water molecules in the concentration chamber are driven by vapor pressure difference, and the liquid water molecules absorb heat, are vaporized, penetrate through the composite membrane, enter the cathode chamber and are condensed into a liquid state; uniformizing: uniformizing the concentration of the electrolyte in the cathode chamber by using hydrogen generated in the cathode chamber in the water electrolysis process; and air blowing operation: oxygen generated by the anode is blown into the concentration chamber after being subjected to gas-liquid separation. The problem of absorbent regeneration is solved through the electrolyte of alkaline electrolyzed water, low-value oxygen generated by the electrolyzed water is reasonably utilized, and continuous concentration of high-salinity wastewater at room temperature is realized by coupling absorption membrane distillation and bubbling membrane distillation.

The invention discloses an atomic layer deposition gas supply system for a low saturated vapor pressure precursor source, and belongs to the technical field of atomic layer deposition reaction equipment. According to the system, a mass flow controller is combined with an original gas inlet pneumatic valve, so that the gas quantity in a precursor source bottle in the deposition process is accurately controlled; the pressure in the precursor source bottle is monitored in real time through a pressure meter, so that the temperature in the deposition process is accurately controlled; in addition, specific contents of precursor source gas and auxiliary gas in source gas are monitored in real time through a gas analyzer at a source outlet, so that a system is assisted to judge whether reaction gas needs to be supplemented or not; the mass flow controller, the pressure meter and the gas analyzer are all connected with the PLC, and control of all the parts is achieved through the PLC; and gas control, pressure monitoring and component monitoring of the low saturated vapor pressure precursor source in the experiment process are realized.

The invention relates to the technical field of natural gas hydrates, in particular to a DSC (differential scanning calorimetry) correction-based multiphase flow system hydrate inhibitor loss prediction method, which comprises the following steps of: firstly, acquiring water activity and vaporization enthalpy of a sample under target salinity and ratio through two DSC tests, and regression a thermodynamic model according to the water activity and vaporization enthalpy to obtain a liquid-phase activity coefficient; the saturated vapor pressure of the inhibitor is calculated through the vaporization enthalpy obtained through DSC inversion and an anchor point method, a component distribution coefficient is obtained through combination of Poynting pressure correction and a gas phase fugacity coefficient, and a Rachford-Rice flash evaporation equation is solved to obtain an equilibrium phasor and composition; and then a first-order total mass transfer model is introduced to correct the actual vaporization loss, and droplet entrainment correlation is superposed to obtain the total flow loss of the inhibitor under the multiphase flow system. According to the method, the total flow loss of the hydrate inhibitor can be accurately calculated under the working conditions of high pressure, low temperature and salt-containing multiphase flow, so that a theoretical support is provided for adjusting an injection strategy of the inhibitor in real time.

The present invention discloses a solid-liquid phase change carbon dioxide absorbent with a controllable phase change time node and its application. This non-aqueous solid-liquid phase change absorbent is composed of 2-(2-aminoethylamino)ethanol (AEEA), 2-amino-2-methyl-1-propanol (AMP), and N-methylpyrrolidone (NMP). Among them, AEEA is used as an activator to adjust the solid phase generation time, avoiding the precipitation of products at low CO2 loads, which may cause equipment blockage; AMP is used as the main absorbent reactant to ensure the high absorption capacity and regeneration performance of the absorbent; NMP with a high boiling point and low vapor pressure is used as a solvent to ensure the use stability of the absorbent. After absorbing CO2, this absorbent can undergo controllable solid-liquid phase separation, with CO2 enriched in the solid phase. Through two-phase separation, only the CO2 solid phase needs to be used for regeneration, thus effectively reducing the regeneration energy consumption. In summary, the high-efficiency non-aqueous solid-liquid phase change CO2 absorbent of this application has the characteristic of a controllable phase change time node, can reduce the risk of equipment blockage, and has broad application prospects.

The present invention discloses a numerical simulation method for laser-induced phase explosion based on the finite element method, which relates to the technical field of high-power laser and material interaction. Laser parameters are preset to establish a numerical simulation model for nanosecond laser ablation of metals. Laser energy is used as a heat source term to generate a two-dimensional numerical grid for the calculation domain of metal ablation. Phase change heat transfer theory is used to consider the metal's phase change, phase interface movement, and particle evaporation backscattering effects to simulate the physical process and obtain the saturated vapor pressure, hot liquid pressure, and material surface temperature. Based on these saturated vapor pressure, hot liquid pressure, and material surface temperature, the numerical simulation model is discretized and solved using the finite element method. Particle tracking is used to simulate the gas-liquid phase splashing process at the moment of explosion. The present invention can accurately predict the dynamic evolution characteristics of phase explosions during laser ablation, providing important theoretical support and technical assurance for fields such as laser processing, laser propulsion, and laser micro-nano processing.

The present application relates to natural gas hydrate technical field, especially relates to a kind of hydrate inhibitor loss prediction method of multiphase flow system based on DSC correction, first by two kinds of DSC test obtains the water activity and vaporization enthalpy of sample under target salinity and proportion, and accordingly regression thermodynamic model obtains liquid phase activity coefficient;Again, the saturated vapor pressure of inhibitor is calculated with DSC inversion vaporization enthalpy and anchor point method, combined with Poynting pressure correction and gas fugacity coefficient obtains component distribution coefficient, solves Rachford-Rice flash equation and obtains equilibrium phase and composition;Subsequently, the first-order overall mass transfer model is introduced to correct actual vaporization loss, and the total loss of inhibitor flow under multiphase flow system is obtained by superimposing droplet entrainment correlation.The present application can accurately calculate the total flow loss of hydrate inhibitor under high pressure, low temperature and salt-containing multiphase flow conditions, thereby providing theoretical support for real-time adjustment of inhibitor injection strategy.

The components of salt from the granules can be efficiently extracted through evaporation. During the treatment of the granules, temperatures can be allowed to approach or exceed the boiling point of one or more of the salt components, preferably in an oxidizing medium. The temperature can be maintained high enough so that the salt content exerts an appreciable vapor pressure and can be sustained for a sufficient time to allow most, all, or substantially all of the salt content to evaporate and be carried away from the furnace in the combustion gases. The evaporated salt can then be condensed and collected.

A method for performing reproducible, accurate, and virtually temperature-independent quantitative measurements of one or more high-vapor-pressure elements in a liquid metal or alloy sample using laser-induced breakdown spectroscopy (LIBS). This method introduces one or more selectively reactive species and a virtually inert carrier gas to modify the local environment at the LIBS sampling point of the liquid metal or alloy and its surroundings. This results in a significant and immediate reduction of vapor effects on the LIBS signals of high-vapor-pressure species in molten metals or alloys, partially eliminating the temperature dependence of these elements and their dependence on spurious environmental factors, thereby reducing the associated uncertainty in LIBS measurements.

The application discloses a method for determining a reasonable displacement pressure of liquid carbon dioxide phase change displacement of coal seam gas, and specifically comprises the following steps: S1, performing an isothermal adsorption experiment on a coal sample of a target coal seam; S2, respectively calculating virtual saturated vapor pressures of CO2 and CH4 gas; S3, establishing a relationship between gas adsorption potential and gas adsorption equilibrium pressure; S4, respectively calculating densities of CO2 and CH4; S5, respectively calculating adsorption spaces of CO2 and CH4 in a coal body; S6, establishing a relationship formula between adsorption potentials of the two kinds of gas and the adsorption spaces; S7, determining a reasonable displacement pressure; S8, determining a reasonable displacement pressure; S9, calculating a CO2 percolation coefficient; S10, determining a reasonable percolation pressure; and S11, determining a reasonable injection pressure. The method provides scientific guidance for popularization and application of the liquid CO2 phase change displacement technology of CH4 in a coal seam.

The invention belongs to the technical field of chemical separation, and discloses a separation method of a high-boiling-point component in high-carbon aldehyde production. The method is characterized in that 0.05%-2.0% of functional ionic liquid is added into a rectification system, and the apparent vapor pressure of impurities is directionally inhibited and the relative volatility is remarkably improved by utilizing the selective hydrogen-bond interaction between anions of the functional ionic liquid and hydroxyl / carbonyl in the impurities. According to the method, the ionic liquid with a molecular recognition function is introduced, the phase equilibrium relation between the high-carbon aldehyde and the high-boiling-point impurities is reconstructed from the thermodynamic essence level, the inherent limitation that traditional rectification depends on weak physical property differences is broken through, efficient, low-energy-consumption and high-stability purification of the high-carbon aldehyde product is achieved, the ionic liquid can be recycled, and the method is suitable for industrial production. The invention provides a novel high-carbon aldehyde purification method which has the advantages of novel principle, simplicity and convenience in operation, high efficiency, energy conservation and industrial feasibility.

The invention relates to the technical field of temperature standard devices, and discloses an adjustable multi-fixed-point calibration device and method based on a water-gas-liquid two-phase equilibrium state, and the device comprises a sealed cavity, a pressure sensing unit, a heating adjustment assembly, a thermometer trap and a heat exchange medium. Pure water is injected through vacuum pumping to form gas-liquid two-phase balance, saturated vapor pressure is measured in real time through the pressure sensing unit, a reference temperature value is obtained in combination with the calculation module, and multi-point temperature calibration is achieved. The heating adjusting assembly performs segmented temperature control, test points are rapidly switched, and a thermometer well is filled with a heat exchange medium to ensure temperature consistency. The temperature calibration device can provide high-precision and adjustable multi-point temperature calibration, and is suitable for deviation characteristic analysis and adjustment of various thermometers.

A method for determining the vapor pressure of a fluid is provided. The method includes the following steps: providing a meter having meter electronics, wherein the meter includes at least one of a flow meter and a density meter; flowing a process fluid through the meter; providing a low-pressure location associated with the meter; adjusting the pressure of the process fluid until flash vaporization is detected at the low-pressure location; and calculating the true vapor pressure of the process fluid if flash vaporization is detected.

Various aspects of this disclosure relate to a composition, comprising a gas phase and a condensed phase, wherein the gas phase comprises a molecule; the condensed phase comprises the molecule; the gas phase has a temperature and a pressure; the molecule has a boiling point at the pressure of the gas phase; the boiling point of the molecule is less than the temperature of the gas phase; the molecule has a vapor pressure at the temperature of the gas phase; the vapor pressure of the molecule is less than the pressure of the gas phase; the condensed phase consists of one or both of a solid phase and a liquid phase; the condensed phase is suspended in the gas phase; and the condensed phase has a surface-area-to-volume ratio of at least 500 per meter.

The invention relates to the technical field of hydrogen storage and release, in particular to a hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier, which comprises a heat exchange unit, a feeding and discharging unit, a hydrogen storage unit, a hydrogen release unit and a separation unit, the heat exchange unit is connected with the hydrogen storage unit, the hydrogen desorption unit and the separation unit through pipelines and used for adjusting the temperature of materials in the units, and the feeding and discharging unit is connected with the hydrogen storage unit, the hydrogen desorption unit and the separation unit through pipelines and used for adjusting and controlling conveying of a hydrogen storage carrier and a hydrogen-rich carrier; according to the design scheme, the liquid organic hydrogen storage carrier with high saturated vapor pressure is selected, the hydrogen storage system with the low-pressure hydrogenation characteristic and the hydrogen desorption system with microwave heating serving as the only heat source are coupled, the higher energy utilization rate can be achieved, the high selectivity of the hydrogen desorption reaction process can be achieved, the separation and purification process is simplified, and the hydrogen desorption efficiency is improved. And high-purity hydrogen can be released at lower cost.

An acidic gas-absorbing liquid that reversibly absorbs and desorbs carbon dioxide, wherein the acidic gas-absorbing liquid contains an organic solvent and an amine compound, and the organic solvent has a Log S value of 0 or less and a vapor pressure of 0.1 to 300.0 Pa at 25°C.

The application discloses a tin-lead-antimony vacuum separation content prediction method fusing ANN enhanced mechanism and SVM residual compensation, and belongs to the field of non-ferrous pyrometallurgical technology.The application firstly constructs a ternary mechanism model based on gas-liquid phase equilibrium theory, and utilizes ANN to establish the complex mapping relationship between the component mass fraction, activity coefficient and pure metal vapor pressure in the mechanism model and characteristic variables;secondly, aiming at the prediction residual of the enhanced mechanism model, a data-driven residual compensation model based on SVM is constructed;finally, the Adam optimizer is used to efficiently optimize the ANN model parameters, and the particle swarm optimizer is used to globally optimize the hyperparameters of the SVM model.The application can accurately and reliably predict the tin, lead and antimony contents in the liquid phase after tin-lead-antimony vacuum separation, provides a strong reference for real-time regulation and control of tin-lead-antimony vacuum separation process parameters, and has important significance for improving the production stability and efficiency of the metallurgical separation process.

The application provides a gaseous sulfur foam flocculation precipitator and application thereof, and comprises at least one of mercaptan, thioether, ammonium sulfide, organic amine and carbon dioxide. The gaseous sulfur foam flocculation precipitator provided by the application is added in H2S gas, and the pressure is not higher than the saturated vapor pressure of each component, so that the sulfur foam can be rapidly agglomerated and large sulfur aggregation particles are formed in the process of generating the sulfur foam, and the sulfur aggregation particles are rapidly precipitated in the reaction process, thereby effectively avoiding the adhesion and blockage of the sulfur, avoiding the continuous cleaning of the reactor, and ensuring the stability of the device operation.

The present invention discloses a method and device for determining thermodynamic parameters of the PVT phase characteristics of a reservoir fluid, wherein the method comprises: determining the critical temperature and critical pressure of the reservoir fluid plus component based on the specific gravity and normal pressure boiling point of the reservoir fluid plus component; determining the eccentricity factor of the reservoir fluid plus component based on the vapor pressure of the reservoir fluid plus component; determining the binary interaction coefficient between the reservoir fluid plus component and the hydrocarbon component based on the result parameters of the reservoir fluid saturation pressure experiment; determining the volume offset term of the reservoir fluid plus component based on the result parameters of the reservoir fluid density measurement; and determining the viscosity parameters of the reservoir fluid based on the result parameters of the reservoir fluid viscosity measurement. The present invention obtains experimental data through a simple experimental process, fits the experimental data step by step, and gradually determines the thermodynamic parameters of the PVT phase characteristics of the reservoir fluid. This method can more quickly obtain the thermodynamic parameters of the PVT phase characteristics of the reservoir fluid and ensure the accuracy of the obtained parameters.

A method allows for reproducible, precise and substantially temperature-independent quantitative measurement of one or more high vapor pressure elements in a liquid metal or alloy sample using laser-induced breakdown spectroscopy (LIBS) or other similar methods. The method introduces one or more selectively reactive substances and a substantially inert carrier gas to alter the local environment at and around the sampling point of the liquid metal or alloy. This results in a significant and rapid reduction in the vapor effect of the LIBS signal on the high vapor pressure species in the metal or alloy melt, partially eliminating the temperature dependency of the high vapor pressure elements and their dependency on false environmental factors, thereby reducing the associated uncertainty in LIBS measurements.

The present invention discloses a method for releasing low saturated vapor pressure gas, comprising a high-pressure resistant aluminum bottle. A connecting sleeve is threadedly fixedly connected to the top of the high-pressure resistant aluminum bottle. High-pressure nitrogen is filled into the high-pressure resistant aluminum bottle according to the application scenario, or a piston is pushed by an electric module to increase the pressure in the high-pressure resistant aluminum bottle. This ensures that the phase change speed of the liquid tracer gas in the high-pressure resistant aluminum bottle is no longer limited by factors such as the saturated vapor pressure, the volume of the delivery bottle, and the diameter of the release channel. The speed at which the tracer gas transforms from liquid to gas is greatly accelerated, meeting the need for rapid monitoring. Under the action of high pressure, the tracer gas release rate is greatly improved. Depending on different application scenarios, while achieving the same function, the assembly and connection methods of the present invention are selected to meet two different application scenarios (in a chemical explosion environment and a slightly positive pressure environment) to achieve rapid release of low saturated vapor pressure tracer gas. The device is also reduced in size and easy to install.

The invention discloses a regulation and control method for realizing rapid and uniform temperature change of a low-temperature liquid cavitation experiment table, and belongs to the field of low-temperature liquid cavitation experiments. The implementation method comprises the following steps: constructing the relationship between the ultralow-temperature liquid environment temperature T1 and the saturated vapor pressure pv; when the ultralow-temperature liquid needs to be cooled, a target saturated vapor pressure value ptarget corresponding to the target liquid environment temperature value Ttarget is obtained according to the relation; the environment pressure is adjusted to ptarget, the ultralow-temperature liquid can automatically evaporate and absorb heat, and then the temperature T1 of the ultralow-temperature liquid is reduced to a target value Ttarget; when the ultralow-temperature liquid needs to be heated, according to the relation between the ultralow-temperature liquid environment temperature T1 and the saturated vapor pressure pv, a target saturated vapor pressure value ptarget corresponding to the target liquid environment temperature value Ttarget is obtained, and the environment pressure is stably kept at the target value ptarget; normal-temperature helium is introduced into the bottom of the ultralow-temperature liquid; and rapid temperature rise and temperature regulation and control of the ultralow-temperature liquid are realized by utilizing the principle of convective heat exchange.

Provided are a production method and a production apparatus for two-component and novel (usable even at normal temperature) one-component moisture-curing polyurethane prepolymers, which achieve diversity, compatibility between safety and environmental friendliness, further improvement in product manufacturing technology and performance (quality), energy saving, and improvement in ease of operation. 【Solution means】Regarding the above two-component and one-component types, safety was improved by using a safe monodiisocyanate with a low vapor pressure. Also, quality improvement was achieved by enhancing the accuracy of the constant reactivity ratio of the two agents. In addition, for the one-component type, a product storage machine was added to the apparatus, and continuous production of the one-component moisture-curing prepolymer and the apparatus were produced economically. As a result, it led to the development of a novel normal-temperature one-component moisture-curing product.

The application discloses a kind of low temperature heat conducting oil based on ionic liquid and preparation method, including: ionic liquid eutectic component 90-98 parts by weight, cleaning dispersant 2-10 parts;Ionic liquid eutectic component is the eutectic of binary or multi-ion liquid mixture.Formed.The application has higher safety, product toxicity is small, can obtain raw material is wide, low in price;Prepared heat conducting oil thermal stability is good, freezing temperature can be as low as-100 DEG C, low temperature viscosity is small, vapor pressure is extremely low, thermal efficiency is high, and cold quantity transmission efficiency is excellent, and low temperature performance is excellent.In addition to the above performance advantages, it also has the advantages of more than 10 years of service life, not easy to coke, and can reduce pollutant emissions, energy saving and environmental protection, widely used, can also be used as ultra-low temperature electrolyte and other low temperature working fluid, etc..

A two-phase immersion-cooling system (1), adapted for accommodating and cooling at least one heat source (H), includes a container (10), a pressure vessel (21), and a vapor compressor (22), the container includes a liquid-storing area (11) and a vapor area (12), the liquid-phase coolant (81) is configured for in thermal contact with at least one heat source and to be vaporized into gas-phase coolant (82) towards the vapor area and mixed with air (831) and water vapor (832) in the vapor area into a mixed gas (83). The pressure vessel is connected to the vapor area via a gas channel (31), the vapor compressor is disposed on the gas channel and configured to draw the mixed gas in the vapor area so as to decrease pressure of the vapor area and to inject the mixed gas into the pressure vessel so as to increase pressure of the pressure vessel.

This invention utilizes mechanical vapor compression and / or thermal vapor compression, integrating compression loops across multiple process stages. A sequential network of compressors is used to increase the pressure and condensation temperature of vapor within each process stage as an internal vapor flow, and as an inter-vapor flow branching between process stages. Because available vapor is shared between compressor stages, the number of compressors can be reduced, improving economics. By separating vapor between compressor stages to balance the vapor mass flow rate across multiple process stages in the incremental compressor stages, the entire vapor compression system can be customized to individual process energy requirements and adapt to dynamic fluctuations in process conditions.

The present invention relates to an atmosphere control device for a vacuum friction tester. The device comprises at least two compressed air circuits, a collecting air circuit, a first air circuit, a second air circuit, a liquid container, a gas mixing container, a connecting pipe, a third air circuit, a first humidity sensor, a first branch circuit, a second branch circuit, a third branch circuit, a fourth branch circuit, a mechanical pump, a gas concentration sensor, a second humidity sensor, an ionization vacuum gauge, a first thermal conductivity vacuum gauge, a vacuum partial pressure gauge, a first baffle valve, a second baffle valve, a turbomolecular pump, a third baffle valve, a plug valve, and a second thermal conductivity vacuum gauge. The device is capable of controlling the humidity of the air atmosphere, the vacuum level of different single gases, the vacuum level of volatile liquids with different saturated vapor pressures, and atmospheric pressure mixing and vacuum level control of mixed gases of different proportions, thereby facilitating testing under different working conditions.

The invention relates to the technical field of liquid density measurement, in particular to a closed density sensor which comprises a pipe body, a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are fixedly installed on the two sides of the pipe body, and a backpressure adjusting assembly and a second detection assembly are fixedly arranged on the side face of the second connecting pipe. A rectification one-way assembly and a first detection assembly are fixedly arranged on the side face of the first connecting pipe, the second detection assembly and the first detection assembly are the same in structure, the backpressure adjusting assembly comprises a valve body, and a mounting cavity, a matching cavity and a guiding cavity are formed in the valve body. By arranging the back pressure adjusting assembly, the fluid pressure in the whole measuring pipe section is actively maintained to be a set value higher than the liquid saturated vapor pressure and the gas precipitation critical pressure, precipitation of dissolved gas is prevented from the physical source, it is ensured that pure single-phase liquid exists in the measuring cavity all the time, and the measuring accuracy is improved. Therefore, signal fluctuation caused by bubbles is eliminated, and a stable differential pressure signal of real liquid density is reflected.

A metal vapor pressure detection device and detection method includes a metal vapor pressure detection mechanism (3) arranged outside the metal vapor pressure detection chamber (1); the metal vapor pressure detection mechanism (3) includes a displacement generation system and a displacement detection system arranged in the displacement generation system; the displacement generation system includes a displacement slider sleeve (5), a displacement slider (4) arranged in the displacement slider sleeve (5), and a pressure balance spring (6) connected to the displacement slider (4). In the metal vapor pressure detection device, the metal vapor pressure can be directly obtained, providing a basis for the online control and adjustment of the metal vapor pressure.