116 results about "Desorption time" patented technology

The invention relates to a device and a method for recovering oil gas by adopting a condensation-adsorption combined technology. The whole technical proposal is characterized in that a mixed gas of various oil gases and air generated during various storage and transportation processes enters a condensing unit with an integrative structure which consists of an evaporator, a compressor, a condenser and an oil water separator through a gas collecting tube; when being condensed to the temperature of about minus 5-5 DEG C, most of components over C5 are condensed and liquefied, and are delivered to a storage tank through a valve and an oil return pipe, or used directly; the rest small part of oil gas mixture passes through the valve and is delivered to an adsorption system by a vacuum pump P1 for further adsorption treatment; after being adsorbed and analyzed alternately by an adsorber A and an adsorber B, stripping gas containing oil gas is delivered to the storage tank by a vacuum pump 2 and the valve, or used directly; the effluent gas with the oil gas approximate to zero enters the atmosphere through an emptying pipe; the sorbent used by the two adsorbers is a phi3 cylindrical-shaped active carbon which is specially researched and used for the recovery of oil gas, and carry out vacuum desorption alternately under the action of the vacuum pump p2; and the desorption time is set to 15-20 minutes. The recovery rate of oil gas by utilizing the device and the method can reach over 98 percent, and the device and the method have the advantages of low cost and being beneficial to environmental protection.

The invention provides a method for determining lost gas content in gas content of shale. The method comprises steps as follows: core samples are acquired from a shale gas underground site, lifted to the ground and placed into an analyzer, multiple parameters are acquired, the zero time, the lost time correction and the core sample weight are calculated before desorption of the core samples, the core samples are desorbed in the analyzer, data acquired during desorption are processed, the square root of acquired desorption time is used as a horizontal ordinate, the acquired desorbed gas content is used as a vertical coordinate, a fitted curve of the desorbed gas content is drawn, and the intercept value of the vertical coordinate of the fitted curve is the lost gas content.

The method for activated carbon fiber variable voltage desorption gas relates to a method of desorption gas by using activated carbon fiber. The method solves the problem of high energy consumption in the prior art. The method comprises: the two ends of an adsorbent bed are sequentially switched on 4-6V of alternating voltage to be heated for 28-32s, 8-12V of alternating voltage to be heated for 28-32s, 13-17 V of alternating voltage to be heated for 28-32s, 18-22 V of alternating voltage to be heated for 28-32s and 13-17 V of alternating voltage, and is then continuously heated by changing the 13-17 V of alternating voltage into 4-6V of alternating voltage when the temperature reaches 70-72 DEG C; the temperature of the carbon fiber is kept within the range of 69-71 DEG C for 8-12min, and the gas with the mass percent of 90-99% can be obtained by desorption. The method has short desorption time, low energy consumption, and simple operation and technique.

The invention relates to a method for gathering carbon dioxide, in particular to a method for gathering carbon dioxide by using high-stability alkaline ionic liquid, wherein carbon dioxide gas is absorbed by taking alkalescent quaternary phosphonium type ion liquid as an absorbent; the absorption pressure is 0.0001-0.2MPa; the absorption temperature is 10-70 DEG C; the absorption time is 0.1-2h; the absorbed carbon dioxide can be desorbed easily; the desorption temperature is within 80-150DEG C; and the desorption time is within 0.1-3h. In the invention, the high-stability alkaline ionic liquid is applied to the chemical gathering of carbon dioxide so that a high-capacity, low-energy consumption and recyclable gathering method of carbon dioxide is realized and a potential method is provided for the industrial gathering of carbon dioxide.

The invention relates to a process for adsorbing and recycling palladium in waste liquor containing palladium by ion exchange resin, belonging to the technical field of the separation method utilizing the ion exchange resin as sorbent to treat liquid. The step of the process is to dispose weakly acidic acrylic acid type cation exchange resin as absorption bed layers and utilize the absorption bed layers to absorb the waste liquor containing palladium, absorption time is 40-60 minutes, and operation temperature is 25-85DEG C. Utilizing hydrochloric acid to desorb the waste liquor containing palladium, desorption time is 60-80 minutes, and the operation temperature is 25-85DEG C. Evaporating, concentrating and crystallizing the desorption liquor containing palladium after desorbing, and at last, recycled palladium compound PdCl2 is obtained. The process also can employ repeated cycle to absorb and desorb 2-8 times. The recovery rate of palladium can reach above 72% by employing the process of the invention. Recovery cost is low. The required equipment and technique is simple, and the operation is easy. Resin is easy to regenerate, and the resin after desorption can be used in repeated cycle.

The invention discloses an automobile engine charcoal canister desorption device. The automobile engine charcoal canister desorption device comprises a fuel tank and an air-in pipe, wherein a charcoal canister is connected between the fuel tank and the air-in pipe, an air filter, a supercharger, an intercooler and a pressure stabilizing cavity are sequentially connected to the air-in pipe in the air-in direction, a fuel air inlet of the charcoal canister is connected with the fuel tank, an air through hole of the charcoal canister is communicated with the pressure stabilizing cavity, and a desorption opening of the charcoal canister is communicated with the air-in pipe between the supercharger and the air filter. A pressure source and hot air on a super-charged engine are utilized to carry out charcoal canister desorption, a pressure difference in the desorption process is greatly improved, desorption air flow is increased under the condition of same desorption time, and the charcoal canister desorption efficiency is improved. The high air temperature in the pressure stabilizing cavity is favorable to the accomplishment of the fuel steam desorption process in charcoal powder, so that the charcoal canister desorption efficiency is further improved. As air in the pressure stabilizing cavity passes the filter, the service life of the charcoal powder is improved through the utilization of clean air in desorption. The work capability of the charcoal canister on the whole vehicle is improved.

The invention provides a vacuum pressure swing adsorption system, which comprises six adsorbers, two groups of independent blowers and three groups of independent vacuum pumps, wherein each group of blowers are connected with the inlet ends of four adsorbers respectively, each group of vacuum pumps are connected with the inlet ends of two adsorbers respectively, the inlet end of each adsorber is communicated with the atmosphere, the outlet ends of the two adsorbers connected with the each group of vacuum pumps are connected, and the outlet end of each adsorber is connected with a product gas tank. The vacuum pressure swing adsorption system cyclically executes the following steps of: adsorption, forward pressure release, vacuum desorption and pressure charge, wherein the ratio of the execution time of the adsorption step to the execution time of the vacuum desorption step is less than 1. The system can enlarge oxygen production scale, reduce the air quantity of the blowers, prolong the vacuum desorption time and reduce the pumping speed of the vacuum pumps so as to reduce energy consumption of the system and save the cost.

The invention relates to a method for calculating gas loss according to a relation between an accumulated desoprtion value and the time. A large quantity of experiments show that the relational equation between the accumulated desorption value in the initial stage after pressure of coal cuttings is released is V=A(t / T)<n>, but the power exponent n is not a constant, is related to the gas pressure and is changed along with the time; accurate determination of the power exponent n of the accumulated desorption value is a key for calculation of the gas loss. In order to accurately calculate the gas loss, the method comprises the steps of 1, firstly evaluating the gas pressure of a coal seam through on-site measurement; 2, recording the observation time t, the accumulated desorption value Vt with the time t, the total desorption time T and the loss time t0 during the on-site measurement of the gas content; 3, measuring the value of n in a lab under a condition of the gas pressure of the coal seam to be measured: obtaining a unitary regression relational equation between lnVt and ln[(t+t0)n-t0n] through Excel by a least square method, wherein an intercept is ln(A / Tn), and substituting the n value and the T value to obtain an A value; and 4, substituting the A value, the T value the n value into V=A(t0 / T)<n> to obtain the gas loss V.

The invention discloses a magnetic pole protective coating vacuum desorption dipping solidification system, a vacuum desorption apparatus and a technology. According to the vacuum desorption technology, before injection of a dipping liquid, vacuum-pumping desorption is performed on an enclosed system formed by a magnet yoke in a magnetic pole and a vacuum bag, and a function relational expression of a degree of vacuum or pressure in the enclosed system is established so that a vacuum desorption process is controlled, wherein parameters of the functional relational expression comprise an average air exhaust volume flow of a vacuum pump, continuous time of vacuum-pumping, initial pressure in the enclosed system and initial volume of the enclosed system. In the desorption dipping system and system, the function relational expression provides a vacuum desorption standard, desorption time can be better grasped, and an effect of mutual examination with detected pressure is formed.

The present invention relates to the extraction method of Jinggang adriamycin. In the method, Jinggang adriamycin fermentation liquid is heated to the temperature between 100 DEG C and 120 DEG C for 5 minutes to 60 minutes. Then the Jinggang adriamycin fermentation liquid is filtered. The filtrate experiences the ion exchange and adsorption through the extra-large positive ion resin adsorption net. And then 0.1-1.5mol per L ammonia solution is used as eluant which cleans the extra-large positive ion resin adsorption net of Jinggang adriamycin. The eluant is collected and vaporized under low pressure to get rid of ammonia gas. After that, crud Jinggang adriamycin A product is achieved, which is further processed to generate Jinggang adriamycin. The method is of short technological process, large absorption quantity, short desorption time, little wastewater emission and low cost.

The invention relates to a method for catching carbon dioxide by adopting alcohol amine type ion liquid, which is used for catching carbon dioxide gas by using alcohol amine type ion liquid based on metallic cation chelate as absorbing agents. The absorption pressure is 0.0001 to 0.2MPa, the absorption temperature is 30 DEG C to 120 DEG C, the absorption time is 0.1 to 2 hours, the desorption temperature is between 80 DEG C and 150 DEG C, and the desorption time is between 0.1 hours and 3 hours. The method has the advantages that the ion liquid is easy to prepare, the stability is good, the absorption capacity is high, the desorption is easy, and the like. The method belongs to a carbon dioxide catching method with the industrial application potential.

The invention discloses a coordination polymer porous material MAF-X8 and a preparing method and an application thereof. The chemical formula of the coordination polymer porous material MAF-X8 is [Zn (mpba)], wherein the [Zn (mpba)] represents negative ions obtained by removing protons of an organic ligand 2-(3,5-Dimethyl-1H-pyrazol-4-yl) benzoic acid (H2mbpa). MAF-X8 crystals are in an orthorhombic system, an Ibca space group, and in a three-dimensional frame structure with a single-dimensional pore passage formed through the bridging of mbpa2-ligands and quadridentate Zn2+ ions and with a pore rate of 50%, the Langmuir specific surface is larger than 1300m2 / g, and good ghermal stability and chemical stability are provided. Particularly, the coordination polymer porous material MAF-X8 can be conveniently manufactured into thin films to be applied in solid phase micro extraction (SPME), and shows high accumulation ability and adsorption selectivity to non-polar benzene series, and has short adsorption and desorption time, low detection limit, wide linear range and the like simultaneously.

The invention discloses a normal temperature and pressure quick desorption electrolysis method of gold loaded carbon, comprising the following steps: a desorption agent containing 2-5% of sodium hydroxide and 5-10% of an auxiliary desorption agent isopropanol is subjected to heating cycle in an entire process system through pumps; the desorption temperature is 80 DEG C and the pressure is 0.1MPa; the gold loaded carbon is desorbed so that the gold enters eluent in the form of complex ions to obtain pregnant solution; the pregnant solution enters an electrolyzer and undergoes electrochemical reaction in the presence of applied voltage so that the gold is deposited and precipitated at the cathode, thus recycling the gold; electrolyzed desorption solution reaches the desorption temperature of 80 DEG C after a heater supplies energy and then circularly passes through the gold loaded carbon to elute the gold in cycles until the concentration of the gold in the pregnant solution is lower than 1-2g / L, then the desorption electrolysis process is completed; the desorption time is only 8-10h; the desorption solution can be reused and can be replenished with the sodium hydroxide and the auxiliary desorption agent isopropanol each time according to the conditions to ensure the concentration of the desorption solution; after being cycled for multiple times, the desorption solution is recycled or processed by purification devices; the desorption solution contains no cyanide, thereby realizing efficient, environment-friendly and clean production.

The invention relates to an organic waste gas purification system comprises a gas inlet device; the gas inlet device is connected with at least more than two zeolite boxes each comprising a box body; the box bodies are each filled with a zeolite filter material; the zeolite boxes are each connected with an exhaust device and a catalytic oxidation device. Three combined processes of zeolite adsorption concentration, hot air oxygen-free desorption and oxygen addition catalytic combustion are adopted for purifying organic waste gas, so the organic waste gas is adsorbed, the saturated-adsorption zeolite filter material is subjected to desorption treatment, and desorbed high-concentration organic waste gas is subjected to catalytic oxidation; the whole circulation purification system is controlled by PLC, the adsorption and desorption time and the catalytic combustion time of the system are controlled according to the concentration of the waste gas of an inlet, the volume of the entering waste gas is calculated, and the time of the zeolite able to adsorb the waste gas is calculated; and the organic waste gas purification system has the advantages of intellectualization, high efficiency and security.

The invention provides a regeneration method of organic adsorbed saturated active carbon. The adsorbed saturated active carbon flows in a gasification cracking furnace to be regenerated; the process is divided into three phases when the adsorbed saturated active carbon flows to a furnace tail from a furnace head of the gasification cracking furnace: a drying phase: the drying temperature is 80-150 DEG C and the drying time is 3-20 minutes; a desorption phase: the desorption temperature is 350-700 DEG C and the desorption time is 20-150 minutes; an activation phase: the activation temperature is 750-1200 DEG C and the activation time is 5-150 minutes, water steam is introduced at the activation phase, and the ratio of the introduction amount of the water steam to the weight of the active carbon is 100-500ml / min to 1kg. The regeneration method has the advantages of capability of realizing continuous production, high heat source utilization rate, stable regeneration performance of the active carbon, high yield, no pollution, small labor intensity and the like.

The invention provides a method used for detecting perfume component migration of main stream smoke gas phase composition of flavored cigarettes. The method comprises following steps: firstly, suction of flavored cigarette samples is carried out; Cambridge filter is used for collecting main stream smoke gas particle phase matters, series connection of a thermal desorption sampling pipe is carried out, and a thermal desorption device and a gas chromatograph-mass spectrometer are adopted for detection analysis, wherein sampling pipe desorption temperature is controlled to be 320 to 340 DEG C, desorption time is controlled to be 30 to 50min, desorption flow speed is controlled to be 50ml / min, inlet shunt rate is controlled to be 150ml / min, outlet shunt rate is controlled to be 100ml / min, temperature programming is performed as following: a temperature of 40 DEG C is maintained for 33min, the temperature is increased to 80 DEG C at a rate of 2 DEG C / min, the temperature of 80 DEG C is maintained for 10min, the temperature is increased to 250 DEG C at a rate of 10 DEG C / min, and the temperature of 250 DEG C is maintained for 30min. The method can be used for migration detection analysis of perfume components of flavored cigarettes, and controlling flavored cigarette quality and adjusting smoke flavor preferably.

The embodiment of the invention discloses a method and device for testing gas containing data of rock. The method comprises the steps of placing the rock to be tested into a desorption device for natural desorption, and monitoring desorption rate; obtaining the function relationship between the desorption rate and desorption time through fitting, and calculating the volume of lost gas according to the function relationship; conducting natural desorption till it is monitored that gas in the rock to be tested is completely desorbed, and measuring the volume of desorbed gas obtained from natural desorption and fast desorption; adding the volume of the lost gas and the volume of the desorbed gas together to obtain total volume, and then obtaining the gas content of the rock to be tested through calculation. By the adoption of the embodiments of the invention, testing processes can be effectively simplified, and the accuracy of a test result is improved.

The invention discloses a hole bottom gas content measuring device and method. The hole bottom gas content measuring device comprises a gas flow speed changing unit (5) and a differential pressure gauge (3), wherein the inside of the gas flow speed changing unit (5) is provided with the differential pressure gauge (3) with a data storage function, a first pressure measuring hole (1) of the differential pressure gauge (3) is communicated with the front section of the gas flow speed changing unit (5), and a second pressure measuring hole (2) of the differential pressure gauge (3) is communicatedwith the middle section of the gas flow speed changing unit (5). The hole bottom gas content measuring method comprises the steps of 1, measuring a pressure different delta P through the hole bottomgas content measuring device; 2, computing the density of flows at every pressure measuring hole, and according to the sectional area of every pressure measuring hole, computing the emission rate of gas at the front end of a measuring point; 3, according to the relation of gas desorption to time, deducing coal bed original gas content. The hole bottom gas content measuring device and method can solve the problems of desorption time defining difficulty and gas desorption loss of coal samples exposed in air in existing drilling hole sampling technology; meanwhile, the h hole bottom gas content measuring device and method is simple in drilling tool structure and simple in measuring method.

The invention discloses a method for preparing glutamic acid surface molecularly imprinted polymer silica microspheres. The method includes the steps that a dilute hydrochloric acid soaking method is adopted, impurity removal is conducted on the surfaces of the silica microspheres, and activated silica microspheres are obtained; surface silanization modification is conducted on the activated silica microspheres, and silanization silica microspheres are obtained; RAFT functionalized processing is conducted on the silanization silica microspheres, and RAFT functionalized silica microspheres with the surfaces grafted with double sulphur ester bonds are obtained; template molecules and functional monomers are fully and uniformly mixed, then a cross-linking agent, initiator and the RAFT functionalized silica microspheres are added, a polymerization reaction occurs, and the molecularly imprinted polymer silica microspheres with the surfaces wrapped by the template molecules are obtained; elution is conducted to remove the template molecules. The surface molecularly imprinted polymer silica microspheres prepared through the method are uniform in wrapping and stable in performance, absorb L-glutamic acid selectively under a water environment and have the advantages of being short in absorption / desorption time and simple in operation.

The invention relates to a device for measuring electrostatic adsorption force and desorption time of an electrostatic chuck, and aims at providing a device capable of being used for accurately measuring the electrostatic adsorption force intensity and the wafer desorption time of the electrostatic chuck. The device comprises a vacuum cavity, the electrostatic chuck (10), a measuring system (14) and a motive power system, wherein the electrostatic chuck is arranged in the vacuum cavity, the measuring system is arranged in the vacuum cavity and is positioned under the electrostatic chuck, the motive power system is arranged on the vacuum cavity, and the motive power system is used for driving the electrostatic chuck to move so that the measuring system and the electrostatic chuck generate relative movement. In the traditional measuring mode, the loss of the effective acting area of plasmas above a wafer is caused, so the electrostatic force measurement in the plasma environment is greater. The device has the advantages that a force sensor is arranged under the wafer, the defects of the traditional measuring mode are overcome, and the device can be widely applied to the test of semiconductor industry electrostatic chuck devices.

The invention relates to structural identification of a small molecule peptide derived from broad beans and application of the peptide to promotion of lactic acid bacteria growth. The broad bean peptide provided by the invention has a structure of Ser-Ala-Gln tripeptide (lactic acid bacteria growth-stimulating peptide (LGSP)). The peptide is prepared by a method including the steps of: taking broad bean protein as the raw material, using a single alkali protease to conduct controlled hydrolysis, employing a pH-stat technique to monitor the DH value, and utilizing Sephadex G-25 and high performance liquid chromatography to perform separation and purification so as to obtain a single component, employing matrix assisted laser desorption time-of-flight mass spectrum MOLDI-TOF-MS to carry out molecular weight analysis and amino acid sequence identification, thus identifying the broad bean growth promoting peptide sequence Ser-Ala-Gln. The lactic acid bacteria growth promoting peptide derived from broad beans prepared by the invention has a small molecular weight, is easily absorbed by the intestinal tract directly, and can increase the number of beneficial bacteria in the intestinal tract. New functions and nutritional properties of broad bean peptide are found, and the added value of broad bean utilization is improved.

The invention discloses a shale loss gas calculation method and system. The method comprises the steps that based on coring and well drilling and completion data, obtaining the core pore structure, the gas reservoir pressure, the core drill lifting time, the desorbed core quality, the shale gas accumulated desorbed gas amount and the accumulated desorption time of a shale gas reservoir; acquiringa shale gas desorption rate based on the shale gas accumulated desorption gas amount and the accumulated desorption time; and based on the gas reservoir pressure, the core pore structure and the shalegas desorption rate, obtaining the content of the shale lost gas under the ground condition. The method has the advantages that the shale lost gas content can be more accurately calculated, and the lost gas content is calculated based on the gas reservoir pressure condition, so that the reliability and accuracy of obtaining the lost gas content are improved, and reliable guarantee is provided forshale gas reservoir reserve calculation and productivity prediction and evaluation.

The invention discloses a solid-phase micro-extraction determination method for trace aromatic amine in urine. The method comprises the following step of carrying out qualitative and quantitative analysis on the trace aromatic amine in the urine by adopting a headspace solid-phase micro-extraction and gas chromatography-mass spectrometry / mass spectrometry (GC-MS / MS for short) technology. The method is characterized in that a coating material of solid-phase micro-extraction fibers is a composite material (JUC-Z2 / Gel for short) formed by a covalent organic framework JUC-Z2 and gel; the extraction temperature is 70 to 90 DEG C, the stirring speed is 400 to 600r / min, the extraction time is 30 to 50min, the desorption temperature is 230 to 260 DEG C and the desorption time is 0.5 to 1min. According to the method disclosed by the invention, the solid-phase micro-extraction fibers, which are specially manufactured and are attached with a JUC / Z2-Gel coating, are used for carrying out extraction and concentration pre-treatment on a sample; the method has the technical characteristics of convenience for operation, high sensitivity, good recovery rate and the like.

The invention discloses a one-step validamycin extraction method from macroporous weak acid absorption resin. The method comprises the following steps: isoelectrofocusing a validamycin fermentation broth, filtering before cooling, adjusting a pH value of filtrate to 7 to 9, cooling to a room temperature, absorbing with the macroporous weak acid absorption resin, and washing with deionized water to be neutral; then, desorbing with 1.0 to 2.0mol / L of ammonia and concentrating collected eluate by decompression until the concentration of validamycin is 10 Baume so as to obtain a validamycin aqueous solution; and absorbing with activated carbine, discoloring and concentrating to 15 Baume to 20 Baume and spraying and drying in vacuum at 40 DEG C to 70 DEG C to obtain validamycin powder which contains about 65 percent of validamycin A. The method has the advantages of short technological flows, great absorption, short desorption time, high extraction yield, little wastewater and waste gas emission and low cost.

The invention discloses an oil gas recovery device and a method of coating adsorption combination technology, belonging to a technology method combing film separation technology with film adsorption technology to recover and treat oil gas. In the method, mixed gas of various oil gases and air, produced in various storing and transporting processes, is sent into an oil gas separator via a gas header to be preliminarily separated, and mixed gas of granule oil gas and air enters a film separator for further separation under the action of the differential pressure of a vacuum pump P1; air which isseparated from the film separator and contains a small amount of oil gas enters an absorber A or an absorber B for adsorption processing; adsorbed air almost containing no oil gas is discharged intoatmosphere via a discharging port. In addition, large-grain oil drops separated by the separator, penetration gas enriched by the film separator and desorption gas which is desorbed from the absorberA or the absorber B are sent into an underground storage tank via an oil return pipe or directly used. Adsorbent in two absorbers is cylindrical activated carbon specially used for recovering oil gas,two absorbers alternately perform vacuum desorption under the action of a vacuum pump P2 with desorption time being15-20 minutes. The oil gas recovery rate of the invention can reach more than 98%, has almost zero discharge of oil gas in effluent gas and can obtain obvious environment benefit and economic benefit.

The invention discloses a process for extracting astaxanthin from prawn shells. The process specifically comprises the steps of soaking prawn shells in hydrochloric acid solution, taking the prawn shells out, washing the prawn shells with water to neutral, and conducting drying and smashing to obtain prawn shell powder; conducting desorption on the prawn shell powder with 70-100 v / v% ethyl alcohol serving as the desorption agent, then adding sig water for extraction at 70-80 DEG C, collecting extracting solution, conducting extraction with an organic solvent, and conducting drying to obtain astaxanthin. During desorption, the ratio of the volume mL of the desorption agent to the mass g of the prawn shell powder is larger than or equal to 8, and desorption time is longer than or equal to 25 min. Sodium hydroxide solution, potassium hydroxide solution or calcium hydroxide solution of 0.5-1.5 mol / L serves as the sig water, and the ratio of the usage amount mL of the sig water to the mass g of the prawn shell powder is larger than or equal to 20. Each time of extraction is longer than or equal to 4 min. According to the method, the prawn shells are treated with ethyl alcohol, consumption is low, cost is low, extraction time is short, extraction rate is high, and the extracting solution is transparent and low in impurity content.

The invention discloses a molecular sieve oxygen generation machinegenerator, and a control system and method thereof. The control system of the molecular sieve oxygen generation machinegenerator comprises a two-position four-way electromagnetic valve, a pressure sensor, a flow rate meter and a control circuit, wherein the two-position four-way electromagnetic valve is used for controlling the pressurization adsorption time and pressure reduction desorption time of a molecular sieve adsorption tower according to the control instruction of the control circuit; the pressure sensor is used for measuring the real-time gas pressure value in the gas conveying pipeline inside the molecular sieve oxygen generation machinegenerator; the flow rate meter is used for measuring the real-time gas flow rate value of the oxygen outlet end of the molecular sieve oxygen generation machinegenerator; the control circuit is respectively separately connected with the two-position four-way electromagnetic valve, the pressure sensor and the flow rate meter through signals, and is used for outputting a control instructioncontrolling the opening and closing time of the two-position four-way electromagneticvalve according to the real-time gas flow rate valve and the real-time gas pressure value for controlling the opening and closing time of the two-position four-way electromagnetic valve; the pressurization adsorption time and the pressure reduction desorption time of the molecular sieve adsorption tower are controlled by controlling the opening and closing time of the two-position four-way electromagnetic valve.

The invention discloses an oxygen preparation device. The oxygen preparation device comprises a filtering mechanism, an air compressor, a temperature and humidity adjusting mechanism and an oxygenation mechanism which are sequentially connected via air pipelines, wherein the oxygenation mechanism comprises two parallel molecular sieve columns and a sealing casing; the two molecular sieve columns are arranged in the sealing casing in parallel, and the molecular sieve columns is connected with a desorption pipeline; each molecular sieve column comprises a net cylinder, molecular sieve particlesare stacked in the corresponding net cylinder, a sealing adjusting cylinder is sheathed at the exterior of each net cylinder, and comprises a fixed cylinder part and a movable cylinder part, and eachmovable cylinder part is rotationally connected with the corresponding fixed cylinder part by using the center axis of the sealing adjusting cylinder as the rotation axis; each movable cylinder part is provided with an absorption position and a desorption position in the movement travel, and at least one part of the movable cylinder part is overlapped on the fixed cylinder part to expose the net cylinder at the desorption position. The oxygen preparation device has the advantage that the air contract area is greatly increased in the desorption process, and the air movement path is shortened, so that the desorption time is shortened.

Methods and systems for delivering a liquid sample to an ion source for the generation of ions and subsequent analysis by mass spectrometry are provided herein. In accordance with various aspects of the present teachings, MS-based systems and methods are provided in which the flow of desorption solvent within a sampling probe fluidly coupled to an ion source can be selectively controlled such that one or more analyte species can be desorbed from a sample substrate inserted within the sampling probe within a decreased volume of desorption solvent for subsequently delivery to the ion source. In various aspects, sensitivity can be increased due to higher desorption efficiency (e.g., due to increased desorption time) and / or decreased dilution of the desorbed analytes. The methods and systems described herein can additionally or alternatively provide for the selective control of the flow rate of the desorption solvent within the sampling interface so as to enable additional processing steps to occur within the sampling probe (e.g., multiple samplings, reactions).