376 results about "Desorption" patented technology

The invention discloses a cumulative environmental risk early warning analysis method and system for soil heavy metal pollution, particularly relates to the technical field of soil environment monitoring, and is used for solving the problems that the existing risk assessment of leakage from heavy metal pollution to underground water is incomplete and insufficient in accuracy. Heavy metal concentration depth distribution data are obtained by measuring heavy metal concentrations in soil at different depths; judging whether a heavy metal pollution risk influencing underground water exists or not according to the data; when the risk exists, analyzing the dynamic influence of surface charge change of soil particles on heavy metal adsorption and desorption behaviors by adopting Gaussian process regression, analyzing the retention effect of the heavy metal in a fracture network through a random walk model, and evaluating the delay influence of the retention effect on the migration rate and path of the heavy metal; and finally, according to the generated heavy metal underground leakage risk assessment result, the groundwater pollution risk is graded, and the accuracy of groundwater pollution risk assessment can be effectively improved.

The invention relates to the technical field of CO2 capture and separation, and particularly discloses an anhydrous absorbent with a self-extraction function as well as application and a recovery method. The anhydrous absorbent is synergistically composed of a mixed amine absorption enhancer with specific composition and a hydrophobic organic solvent, wherein the mixed amine absorption enhancer comprises primary amine, secondary amine and tertiary amine. The mixed amine absorption accelerant combines the advantages of high reaction activity of primary amine, low regeneration heat of secondary amine and high absorption capacity and strong hydrophobicity of tertiary amine, so that the anhydrous absorbent shows excellent self-extraction capacity in the adsorption and desorption processes of acid gas, particularly, the anhydrous absorbent after absorbing the acid gas forms a less-water CO2 rich phase, and the CO2 rich phase has excellent self-extraction capacity. And due to the characteristic of less water, sensible heat and latent heat of vaporization required by a rich phase in a CO2 desorption stage are remarkably reduced, so that the problem that the energy consumption is too high in the regeneration process of the existing water-based absorbent is effectively solved.

The invention belongs to the technical field of oil-gas field development, and particularly relates to a method for testing the content of adsorbed gas in a coal bed gas diffusion process. The problem that the desorption degree of coal bed gas cannot be clearly known at present is solved. According to the technical scheme, high-temperature and high-pressure isothermal adsorption experiments under the condition of different gas proportions are carried out, methane adsorption-desorption capacity of mixed gas of different proportions under different partial pressures is determined, gas diffusion experiments are carried out to evaluate gas migration capacity in the diffusion process and methane gas partial pressure distribution in a sample, and different experiment results are synthesized to determine the methane gas content of the sample. The desorbed gas content in the coal bed gas diffusion process can be calculated; according to the new method, the proportion of the methane desorption gas amount in the coal bed gas development process can be calculated, and the desorption degree of the adsorbed gas of the coal bed reservoir is evaluated.

The utility model relates to the technical field of waste gas treatment, in particular to a device for continuously and circularly adsorbing and desorbing VOCs waste gas in CEC tail gas. The device comprises a condensation separation unit and an adsorption and desorption unit which are sequentially communicated, the condensation separation unit comprises a condenser and a gas-liquid separator which are sequentially communicated through a pipeline; a discharge port of the condenser is connected to an upper feed port of the gas-liquid separator, and an upper gas outlet of the gas-liquid separator is connected to the adsorption and desorption unit; the adsorption and desorption unit comprises a fluidized bed adsorption tower and a desorption tower, and a discharge port in the bottom of the fluidized bed adsorption tower is connected to an adsorbent feed port in the bottom of the desorption tower; an adsorbent discharge port in the top of the desorption tower is connected to an upper feed port of the fluidized bed adsorption tower; and an upper gas outlet of the gas-liquid separator is connected to a gas inlet of the fluidized bed adsorption tower. According to the device disclosed by the utility model, the continuous cycle operation can be realized in the adsorption and desorption processes, the regeneration temperature and pressure of the adsorbent are adjustable and controllable, the adsorption efficiency is high, and the efficient removal of VOCs impurities can be ensured.

The present invention belongs to the field of shale gas technology, and in particular to a shale gas rapid desorption test device and method. Aiming at the problem that shale gas molecules have strong adsorption force and are difficult to desorb, and the shale itself has low permeability, resulting in a long experimental time for shale gas desorption test, the following scheme is proposed, including a main box, wherein a crushing and screening module is arranged inside the main box, and the crushing and screening module includes a base and a fixed cylinder, the base and the fixed cylinder are fixedly connected to the bottom inner wall of the main box, the inner wall of the fixed cylinder is slidably connected to a mounting cylinder, an acceleration module is arranged on the mounting cylinder, and a tray is fixedly connected to the bottom inner wall of the mounting cylinder. A shale gas rapid desorption test device and method disclosed by the present invention can make shale sample particles vibrate in the vertical direction during desorption, and at the same time, stirring with a stirring paddle can make the gas inside the shale sample more fully contact the desorption environment, thereby accelerating the desorption process.

An integrated system for adsorbing carbon dioxide (CO2) in the air is described. The system includes: an adsorber that adsorbs the CO2 from the air using a sorbent; and a desorber, coupled to the adsorber, that desorbs the adsorbed CO2 from the sorbent (e.g., in an energy-efficient manner, such as without using steam) into an output of the system. In contrast with other approaches, the system may continuously move the sorbent, as an ensemble, through the system. Thus, the system may concurrently (and continuously) perform adsorption and desorption. Moreover, the sorbent may include a cost-effective and robust free-standing bulk solid. This may allow the sorbent to be used in multiple cycles or transits through the system. Furthermore, after the multiple cycles, the sorbent may be replaced while the system is operating, and the used sorbent may be recycled for subsequent reuse in the system.

The invention relates to the field of cavity ring-down, in particular to a cavity ring-down spectrum detection system and method, and the system comprises a detection unit, a gas path system, a constant temperature control unit and a control and processing unit. The gas path system can be used for filling inert protective gas into the ring-down cavity and maintaining a micro-positive pressure state in a non-measurement period of the detection system, so that external pollutants and water vapor are effectively prevented from invading, and lens pollution and internal adsorption are reduced; the constant-temperature control unit is used for carrying out overall temperature control on the ring-down cavity and the gas path system and inhibiting signal drift caused by water molecule adsorption / desorption; and the gas path system adopts a low-adsorption material, a dead-cavity-free structure and a low-leakage sealing joint, so that the memory effect and the leakage risk are further reduced. The invention also provides a corresponding detection method which comprises the steps of micro-positive pressure maintenance, constant temperature control, strong purification, sample measurement and the like. According to the system and the method, the measurement precision and the stability are remarkably improved, the maintenance frequency and the startup purging time are reduced, and the maintenance requirement is reduced.

A graded tar recovery system relates to the field of tar recovery. The graded tar recovery system includes a heat exchanger and a tar adsorption and desorption integrated rotary device. The heat exchanger is provided with a baffle and a heat exchange tube. The tar is separated under the indirect cooling of the heat exchanger and the inertial separation of the baffle. The adsorption and desorption integrated rotary device includes four turntables with the same mechanism. Each turntable rotates in an adsorption zone and a desorption zone with different temperatures under the drive of a belt. The adsorbent absorbs the tar to separate the tar from the coal gas. The adsorbent that adsorbs the tar sequentially desorbs and recovers the tar with different boiling points in the desorption zone with different temperatures. The system can realize the classified recovery of tar with different boiling points without generating chemical wastewater, is green and environmentally friendly, and also improves the recovery efficiency.

The invention provides a method for determining the residual yield of shale gas based on methane carbon isotope change in desorption gas. The method comprises the following steps: S1, putting a shale sample into a desorption tank filled with saturated salt water, and sealing; s2, placing the desorption tank in water, recording the volume of desorption gas according to the desorption time by using a drainage method, and collecting the desorption gas; s3, according to the analytic gas collected in each analytic time period, calculating accumulated total analytic gas, and calculating the proportion of the analytic gas in each analytic time period to the total analytic gas to obtain a stage accumulated analytic rate; s4, measuring the ratio of methane carbon isotope delta 13C in the desorption gas when the desorption rate is accumulated in each stage; and S5, establishing a change curve of the stage cumulative analysis rate of the shale gas and the methane carbon isotope delta13C so as to obtain a model for predicting the shale gas productivity stage. The invention provides a non-destructive and direct gas potential measurement means, which is high in accuracy and can be well adapted to shale gas prediction.

Systems and methods for modeling gas desorption in a subterranean reservoir include measuring a gas sorption parameter using a crushed core sample from the subterranean reservoir; computing a gas storage capacity of the subterranean reservoir at an initial reservoir pressure based on the gas sorption parameter; generating a three-dimensional (3D) distribution of total organic carbon (TOC) in the subterranean reservoir; estimating a 3D distribution of original adsorbed gas in place of the subterranean reservoir by correlating the gas storage capacity with the 3D distribution of TOC; and predicting the amount of gas desorbed from the subterranean reservoir as the reservoir is depleted.

The invention relates to the field of coal seam anti-reflection, and particularly discloses a coal seam carbon dioxide and static expanding agent synergistic anti-reflection system and method. Slurry prepared by mixing a static expanding agent and water is injected into the expansion fracturing drill hole, in the process that the static expanding agent is subjected to hydration reaction and generates expansion stress, carbon dioxide gas is injected into the expansion fracturing drill hole through the carbon dioxide gas injection pipe, carbon dioxide and the hydration product of the static expanding agent are subjected to carbonization reaction to generate larger expansion stress, and the expansion fracturing drill hole is formed. Expanding the coal body fractures to form expansion fractures; the carbon dioxide is driven by differential pressure to seep into a coal matrix along expansion fractures, and adsorbed gas is driven to be desorbed into a free state through a competitive adsorption effect; and under the combined action of extraction negative pressure and carbon dioxide displacement, the free-state gas moves from the fracture channel to the extraction drill hole, and extraction is conducted through the gas extraction system. Carbon dioxide and the static expanding agent cooperate to improve permeability of the coal body, the displacement effect of carbon dioxide on gas is promoted, and the gas extraction effect is improved.

The invention discloses a capture method for self-adaptive carbon dioxide concentration regulation and control, and belongs to the technical field of gas separation and capture. The method comprises the following steps: monitoring carbon dioxide concentration in real time through a gas sensor; dynamically adjusting adsorption parameters according to the concentration change, wherein the adsorption parameters comprise three working states including a low-flux adsorption mode, a self-adaptive adjustment mode and an enhanced capture mode; when the concentration is low, the airflow speed is reduced to 0.1-0.5 m / s; when the concentration is medium, the airflow speed is dynamically adjusted and the temperature of the adsorption bed is controlled through a PID controller; when the concentration is high, measures such as pressure increasing, temperature reducing or high-capacity adsorbent switching are taken; in the desorption stage, carbon dioxide is released in a variable-temperature or variable-pressure mode. The method solves the problems that an existing carbon dioxide capture system is low in energy efficiency due to fixed parameter control and cannot automatically adjust the adsorption rate under the concentration fluctuation working condition, the operation parameters can be automatically optimized according to the environment concentration change, and the capture efficiency and the energy utilization rate are remarkably improved.

The utility model relates to the technical field of waste gas treatment, in particular to molecular sieve desorption waste gas treatment equipment which comprises a base, an absorption mechanism is fixed at the top of the base and provided with an adsorption wheel mechanism, the absorption mechanism comprises an absorption shell, and the absorption shell is connected with the base in a sealed mode. The rotary motor drives the sliding columns to slide in the first sliding rail, the second sliding rail, the third sliding rail and the fourth sliding rail respectively, so that rotation of the limiting wheel is achieved; the limiting wheel rotates to drive the adsorption turntable to rotate, so that the first adsorption chamber, the second adsorption chamber, the third adsorption chamber and the fourth adsorption chamber can be replaced at any time, different adsorption chambers can be switched and adjusted to perform waste gas adsorption treatment, the situation that the machine is stopped to replace molecular sieve particles and the waste gas adsorption continuity is influenced is avoided, and the waste gas purification efficiency is improved.

The invention relates to a shale or coal rock gas evaluation method based on a gas-water two-phase flow isotope fractionation model. The shale or coal rock gas evaluation method comprises the following steps: 1, collecting data; 2, establishing a gas well model; 3, establishing a control equation set; 4, coupling the influence of the real gas effect and the effective stress; 5, establishing a gas transmission model and a relative permeability model; 6, establishing a relation between capillary pressure and saturation; 7, considering critical desorption pressure; 8, setting boundary conditions of initial conditions; 9, solving a control equation set; 10, calculating production dynamic parameters and isotope values; 11, performing history fitting; 12, verifying historical fitting quality; 13, predicting productivity; 14, calculating a gas dynamic output proportion; 15, identifying a fractionation inflection point and gas production mechanism conversion; by coupling gas-water two-phase flow, multiple gas transmission mechanisms, stress sensitivity and methane isotope competitive adsorption theories, yield prediction of the deep reservoir and quantitative evaluation of the dynamic proportion of produced gas are realized.

The invention relates to a system (100) for reducing carbon dioxide from ambient air, comprising a first device (12, 12a) for adsorbing the carbon dioxide using a free-flowing adsorption material (1), wherein the first device (12, 12a) has a feed area (16) for feeding the adsorption material (1) and a discharge area (18) for removing the carbon dioxide-enriched adsorption material (1) from the first device (12, 12a), wherein the first device (12, 12a) is configured to carry out the adsorption of the carbon dioxide under a first pressure (p1), in particular atmospheric pressure, and comprising a second device (32) for desorbing adsorbed carbon dioxide from the carbon dioxide-enriched adsorption material (1), wherein the second device (32) is configured to carry out the desorption under a second pressure (p2) reduced compared to the first pressure (p1).

The application discloses a kind of gas-liquid two-phase flow numerical simulation method considering coalbed gas desorption lag, comprising the following steps: using well logging, indoor experiment means to obtain productivity calculation parameter;Desorption equation of matrix system is defined in combination with desorption lag effect, diffusion equation;Gas-water two-phase percolation equation of fracture system is defined, and desorption equation of matrix system, diffusion equation is combined, and double medium gas-water two-phase coupling flow equation set is formed;The porosity and permeability change of matrix system and fracture system in production process is calculated respectively, and the physical property change equation set of double medium is deduced;Using the numerical solver of COMSOL, the coupling equation set is solved using iterative method, and the gas production and water production are calculated.The application is simple to operate, can more scientific and reasonable assess the influence of coalbed gas desorption lag effect on gas well productivity, while greatly reducing the cost and time of gas well numerical simulation calculation, and also has important inspiration for other unconventional gas reservoir development affected by desorption lag.

The invention discloses a method for recovering precious metal from refining wastewater, and relates to the technical field of wastewater resourceful treatment. Comprising the following steps: adding a porous carbon-based composite material into the acidic silver-containing refining wastewater, and stirring for adsorption to obtain an adsorption solution; the porous carbon-based composite material adsorbing the silver ions is recycled in a filtering or centrifugal separation mode; the porous carbon-based composite material adsorbing the silver ions makes contact with a desorption agent, desorption treatment is conducted, and a regenerated porous carbon-based composite material and a silver-containing desorption solution are obtained through separation; and a reducing agent is added into the silver-containing desorption solution, and silver ions are reduced into elemental silver to be recycled. The precious metal silver in the refining wastewater is recovered by adopting an adsorption method, and the recovery rate of the silver is relatively high.

The invention discloses a real-time monitoring data control method for adsorption separation and an adsorption separation device, and relates to the technical field of adsorption and analysis regulation and control. The method comprises the following steps: setting a first cleanliness threshold value of finished gas and a second cleanliness threshold value of desorption gas; according to the current state of the first cleanliness and the current state of the second cleanliness, the regeneration medium flow of the analysis process is dynamically adjusted; or when the first cleanliness reaches the first cleanliness threshold value and the second cleanliness reaches the second cleanliness threshold value, the current adsorption process is ended, and the working mode is switched; if the second cleanliness does not reach the threshold value, the regeneration medium flow is increased until the switching condition is met. Saturation regulation is carried out by monitoring the dual states of the finished gas and the desorption gas in real time, actual working condition fluctuation can be responded in a self-adaptive mode, the quality stability of the finished gas is guaranteed, meanwhile, the problem that regeneration is insufficient or regeneration media are excessively consumed is solved, and operation energy consumption is remarkably reduced.

The invention provides an adsorption process for recovering ethylene from refinery dry gas through combination of MOF and zeolite, raw material gas is refinery dry gas, a main body contains hydrogen, carbon dioxide, C1-C3 low-carbon hydrocarbon gas and the like, the content of C2H4 is about 10%, a pre-decarburization process and an associated bed process are introduced, the adsorption capacity of an adsorbent is protected, and the content of ethylene is reduced. The non-compliant purity ethylene gas in the pressure swing adsorption process is re-enriched and recovered through an associated bed; in the initial stage of adsorption separation, after CO2 is removed through a customized or commercialized adsorbent, C2H4 enrichment and purification are directly carried out, and by introducing an associated bed, ethylene in gas passing through the adsorption process and ethylene gas in the preliminary desorption process of the adsorption bed are captured again, so that the ethylene recovery rate in the process is improved.

Contaminant recovery system and method for purifying a process gas containing at least one adsorbable contaminant. A first rotary concentrator has an adsorption zone having at least one filter element for adsorbing at least one adsorbable contamination from a process gas containing the at least one adsorbable contamination, and a desorption zone. An inert desorption carrier gas closed loop stream is in fluid communication with the desorption zone, a condenser, and a heat source for heating the carrier gas to a temperature effective for desorbing the at least one adsorbable contamination in the desorption zone. A second rotary concentrator may be included downstream of the first rotary concentrator.

The invention belongs to the technical field of oil and gas exploitation, and relates to a nanometer desorbing agent for a gas well and a preparation method thereof.The desorbing agent is prepared by using biochar subjected to special pretreatment as a core carrier, loading bimetallic oxide nanoparticles in a specific proportion and carrying out surface modification with an environment-friendly surface active agent. Through the synergistic effect of the nanometer size effect, the catalysis / electron transfer effect of the metal oxide, the physical adsorption and pore transport effect of the biochar and the interfacial tension reduction effect of the surfactant, the adsorption energy barrier of gas molecules such as methane on the rock surface is remarkably reduced, and efficient desorption of the gas molecules is promoted. Meanwhile, all the components and the preparation process are environment-friendly and harmless to a human body.

The invention provides a thermal response hydrogel construction method based on solid-liquid interface repulsive force and water content, which comprises the following steps: establishing a coarse graining model of a thermal response polymer network and a water molecule system, and constructing a three-dimensional polymer gel network by adjusting the number of polymer chain monomers and the proportion of a cross-linking agent; constructing a simulation box according to the network geometric dimension and filling the simulation box with water beads; defining interaction parameters among beads under the dissipative particle dynamics model, performing molecular dynamics simulation, counting the mass center of a polymer skeleton and the number of water beads adjacent to an interface, and calculating the equilibrium moisture content; establishing a solid-liquid interface model, and calculating an equilibrium distance and interaction energy between a water bead plane and a polymer skeleton plane at the adsorption temperature; the network polymerization degree is optimized by adjusting the number of polymer chain monomers, and the optimal design of the thermal response desorption performance is achieved. The method provided by the invention is suitable for macroscopic hydrogel structure evaluation, can quickly obtain equilibrium moisture content and interfacial interaction energy, and guides reasonable proportioning and preparation of the hydrogel.

The invention discloses an active treatment method for multi-source residual coal gas of a waste mine, which comprises the following steps: firstly, hydraulic fracturing pressure relief permeability improvement and overlying strata separation layer grouting reinforcement are cooperated, the hydraulic fracturing pressure relief permeability improvement establishes a netted fracture network in a coal body to realize permeability improvement, and the overlying strata separation layer grouting reinforcement compacts goaf gangue through grouting and reinforces an overlying strata to form a continuous bearing consolidation body; and therefore, a pressure relief and permeability increasing-strengthening and reinforcing integrated structure is formed, a stable structure and a penetrating seepage network are provided for subsequent displacement and gas extraction, and the subsequent gas extraction efficiency is guaranteed. Then low-temperature liquid CO2 is injected into the coal seam through the injection well, gas displacement and desorption are conducted on gas adsorbed in the coal seam under the action of phase change and competitive adsorption, expansion and development are conducted on fractures to enable permeability to be secondarily enhanced, and meanwhile part of CO2 obtained after displacement is retained and sealed in a coal body and a goaf; on the premise that the gas extraction concentration and efficiency are effectively improved, CO2 can be stored, and the dual effects of resource utilization and carbon storage are achieved.

A new method for extracting lithium from salt lake brine, comprising the following steps: a salt lake old brine raw material, desorption liquid, low-magnesium water, and adsorption tail liquid pass through an old brine feeding pipe (2), a desorption liquid feeding pipe (4), a low-magnesium water top desorption liquid feeding pipe (3), and an adsorption tail liquid top desorption liquid feeding pipe (11), respectively, which are located above and below a rotary disc of a multi-way valve system (1); and after respectively entering corresponding adsorption columns (6) by means of a duct and channel within the multi-way valve system (1), the entire process procedure is completed from an adsorption tail liquid discharge pipe (7), a qualified desorption liquid discharge pipe (10), a lithium-containing old brine discharge pipe (8), and an adsorption tail liquid top desorption liquid discharge pipe (5); and the adsorption columns (6) are connected in series or in parallel by means of channels located in the multi-way valve system (1). The feature in which a multi-way valve device is simple and easy to operate is utilized, and in comparison with a fixed bed operating system, the utilization rate of lithium adsorbent may be increased by over 20%, the utilization efficiency of the lithium adsorbent may be increased by over 40%, and production costs may be reduced by 30-50%. Therefore, the stability of a qualified desorption liquid is improved, stable production is guaranteed, and year-round constant operation may be achieved.

The invention discloses a gas concentration-oxidation-heat regeneration system and method, and relates to the technical field of coal mine energy conservation and emission reduction, the gas concentration-oxidation-heat regeneration system comprises a chemical adsorption device which is communicated with low-concentration gas and is used for adsorbing and dedusting the low-concentration gas, and a physical adsorption device which is communicated with the chemical adsorption device and is used for adsorbing and dehumidifying the low-concentration gas, the chemical adsorption device and the physical adsorption device are communicated with the oxidation device through the chemical desorption device and the physical desorption device respectively, the oxidation device is communicated with the waste heat utilization device, and low-concentration gas is subjected to dust removal treatment while methane adsorption is completed through the chemical adsorption device; the physical adsorption device is used for completing methane adsorption and dehumidifying low-concentration gas at the same time, and desorbing is completed and concentrated methane after desorption is subjected to oxidation and waste heat utilization at the same time, so that dust removal, dehumidification, concentration, oxidation and waste heat utilization of the device form a whole, the structure of the device is simplified, and the low-concentration gas is fully utilized.

The invention discloses a purging method which is applied to a pressure swing / temperature swing adsorption method, and the purging method comprises the following steps: at least blowing high-purity gas into an adsorption tower from one end of the adsorption tower, so that when the pressure swing / temperature swing adsorption reaches a stable state, the gas distribution in the adsorption tower is changed from a first state to a second state; in the first state, the concentration of target gas adsorbed in the molecular sieve is not less than a first threshold value; in the second state, the concentration of the target gas adsorbed in the molecular sieve is not less than a first threshold value, the concentration of the target gas in the mixed gas outside the molecular sieve is not less than a target gas concentration expected value in the desorption gas, and the desorption gas in the mixed gas at the two ends of the molecular sieve bed layer is not less than a second threshold value; the target gas concentration in the mixed gas at at most one end is not greater than a first preset value. According to the invention, the concentration of the target gas in the desorption gas can be effectively improved.

The invention provides a successive extraction analysis method and system for shale oil adsorption layer thickness, and belongs to the field of shale oil exploration and developing.The successive extraction analysis method comprises the steps that a first solvent and a second solvent are adopted to conduct successive extraction on a shale core, and free shale oil and adsorbed-mutually soluble shale oil are removed in sequence; respectively carrying out an N2 isothermal adsorption-desorption experiment on the core sample extracted each time, and determining a first pore diameter of shale and a second pore diameter of shale; and based on the positive correlation between the first pore diameter of the shale and the second pore diameter of the shale, determining the adsorption layer thickness of the shale oil in the target area. The measurement system can comprise a successive extraction subsystem, an N2 isothermal adsorption-desorption measurement subsystem and a positive correlation analysis subsystem. According to the method provided by the invention, real and accurate determination of the shale oil nano adsorption layer under geological conditions can be realized from the perspective of experimental actual measurement.

The invention discloses an experimental device for cyclic absorption and desorption of ammonia-containing mixed gas and an ammonia separation method.The device comprises an absorption tower system, a desorption tower system, an absorbent configuration system, a vacuum system, an analysis system and a control system, and the absorption-desorption performance of an absorbent can be evaluated by regulating and controlling parameters such as pressure, temperature and flow. The absorption tower system adopts a sleeve type structure and is provided with a preheater, and the desorption tower system realizes ammonia gas separation under a vacuum condition; the absorbent configuration system is suitable for absorbents with different viscosities, and the vacuum system is used for recovering high-purity ammonia gas. The ammonia separation method comprises the following steps: the ammonia-containing mixed gas is in countercurrent contact with the eutectic solvent in the absorption tower, and the rich solution is subjected to vacuum desorption by the desorption tower to be regenerated into the barren solution for recycling. The problems that a traditional solvent absorption method is irreversible and high in corrosivity are solved, efficient separation and recycling of low-concentration ammonia are achieved, and the net value and yield of ammonia synthesis reaction are increased.

The invention discloses a cyclic regeneration treatment method of stainless steel pickling waste liquid, which realizes full-flow recycling of the pickling waste liquid by constructing a closed-loop system of pretreatment, adsorption, desorption, recovery, regeneration and circulation. A molecularly imprinted polymer adsorption technology is adopted, targeted capture of Cr < 3 + >, Ni < 2 + > and Fe < 2 + > / 3 < + > is achieved through specific recognition sites, and the bottleneck that a traditional adsorbent is poor in selectivity is broken through; the supercritical CO fluid extraction technology utilizes the characteristics of high diffusivity and low surface tension, efficient desorption of metal ions is achieved under mild conditions, and secondary pollution caused by a traditional organic solvent is avoided. A technical closed loop is formed among the steps through parameter synergy and substance circulation, and finally the dual purposes of full-amount regeneration of the pickling waste liquid and efficient recovery of metal resources are achieved.

The present invention belongs to the field of shale oil exploration and development. Provided are a successive-extraction analysis method and system for the thickness of a shale oil adsorption layer. The successive-extraction analysis method comprises: using a first solvent and a second solvent to perform successive extraction on the core of shale, and sequentially removing free shale oil and adsorbed-miscible shale oil; for a core sample obtained by means of extraction each time, respectively carrying out an N2 isothermal adsorption-desorption experiment, so as to determine a first pore diameter of the shale and a second pore diameter of the shale; and on the basis of a positive correlation between the first pore diameter of the shale and the second pore diameter of the shale, determining the thickness of an adsorption layer of shale oil in a target area. A determination system may comprise: a successive extraction subsystem, an N2 isothermal adsorption-desorption determination subsystem, and a positive-correlation analysis sub-system. By means of the method provided in the present invention, the realistic and accurate determination of a shale oil nano-adsorption layer under geological conditions can be implemented from the perspective of experimental measurement.