311 results about "Cold trap" patented technology

The invention discloses a multifunctional integrated gas control system for a dilution refrigerator, and particularly relates to the field of refrigeration and low-temperature engineering, which comprises a liquid nitrogen cold trap, a gas buffer tank, an integrated valve box, a dilution refrigeration internal circulation pipeline, a diaphragm compressor, a roots pump, a turbo molecular pump and a vacuum suction pump set. According to the system, a highly-integrated valve box module is used and is responsible for implementing gas circuit control on different stages such as dilution refrigeration cycle starting, operation and shutdown rewarming; according to the invention, conductance optimization and heat loss reduction are carried out on gas paths with different temperature zones and different pressures, high air tightness of a full temperature zone from room temperature to extremely low temperature is ensured, the reliability and the automation degree of the dilution refrigerating machine are improved, and very positive significance is provided for practicability of a dilution refrigerating system.

The invention discloses a detection device and a detection method for dissolved gas in insulating oil. The detection device comprises a rapid degassing module and an analysis module, the rapid degassing module comprises a sample bottle, a heating oil sample pool, a stirring structure, a high-purity gas storage tank and a cold trap; the sample bottle is used for injecting an insulating oil sample to be detected; the heating oil sample pool is used for heating the insulating oil sample in the sample bottle; the stirring structure is used for stirring the insulating oil sample in the sample bottle; the high-purity gas storage tank is used for introducing inert gas into the sample bottle and accelerating discharge of dissolved gas; the cold trap is used for enriching the mixed gas discharged from the sample bottle and selectively adsorbing and enriching the target gas to be detected; and the analysis module is used for detecting the gas analyzed from the cold trap. According to the detection device disclosed by the invention, the insulating oil sample to be detected is simultaneously subjected to heating stirring, gas purging replacement and cold trap enrichment, so that the dissolved gas in the insulating oil can be quickly removed, the degassing time is shortened to be within 5min, and the degassing treatment efficiency is greatly improved.

The invention discloses a low-temperature cold trap water removal device which comprises more than two water removal channels which are connected in parallel; each water removal channel comprises a refrigeration water removal gas path and an ice melting purging gas path which are connected in series; each refrigeration and water removal gas path is also connected with an inlet of a dry gas collection gas path, and an outlet of the dry gas collection gas path is used for being connected with an analyzer; and each water removal channel is connected with a controller, and the controller is used for controlling the refrigeration water removal gas paths and the ice melting purging gas paths of the different water removal channels to operate in a staggered mode. According to the application, moisture in the gas to be dewatered can be effectively removed, frost can be timely removed, and related phenomena such as relatively large dead volume of the cold trap can be avoided.

A cooling system includes a liquid loop, a vapor compression loop, and a heat exchanger in fluid communication with each of the liquid loop and the vapor compression cycle loop. The liquid loop includes a cold sink for cooling a heat load. The vapor compression cycle loop is fluidly coupled to the liquid loop by a separator, which is configured to separate a two-phase form of a working fluid received from the cold sink into a vapor form of the working fluid and a liquid form of the working fluid.

The invention discloses an off-line carbonate cluster isotope sample preparation system and preparation method, the system adopts a main controller and a plurality of sub-controllers to work cooperatively, parameters such as temperature, pressure, gas flow direction and the like are accurately controlled, and the stability and repeatability of sample preparation are ensured; an SPR gas sensor and a fluorescent gas sensor are arranged, CO2 concentration and pressure changes are monitored in real time, accurate data support is provided for a main control machine, and dynamic adjustment and optimization are achieved; a multi-stage cold trap design is adopted, and liquid nitrogen and a methanol-liquid nitrogen mixture are combined for cooling, so that impurity gas is effectively separated, and high purity of final CO2 gas is ensured; the system adopts a modular design, is simple and convenient to operate, is easy to maintain and upgrade, and has good expansibility and universality.

The invention relates to the technical field of environment gas pretreatment analysis, and discloses a low-concentration atmosphere VOCs sampling pretreatment device and method. The pretreatment device comprises a cold trap module which at least comprises two cold trap units working independently, each cold trap unit is composed of a stainless steel pipeline and provided with a temperature control module, the temperature adjusting range is-196 DEG C to 250 DEG C, and the cold trap module is used for adsorbing VOCs and moisture in a sample at low temperature and desorbing target VOCs at high temperature; the refrigerating system comprises a semiconductor thermoelectric refrigerating device which is mixed with a mechanical refrigerating unit and is used for controlling the adsorption temperature of the cold trap module; and the flow control module is used for realizing constant-current sampling by adopting an electronic metering algorithm, and the flow regulation range is 0-100mL / min. According to the method disclosed by the invention, two-section cold trap step-by-step condensation is adopted, and water is directionally removed in combination with blowback airflow, so that the recovery rate of VOCs is increased, the residual quantity of water is lower than 50ppm, and the peak shape symmetry and data reproducibility of GC-MS detection are remarkably improved.

The utility model provides a multi-layer cold trap device. The multi-layer cold trap device comprises a first shell, a second shell, a third shell, an air inlet pipe and an air outlet pipe, wherein the second shell is arranged in the first shell, and a medium space is formed between the first shell and the second shell. A medium cavity is formed in the third shell, the third shell is arranged in the second shell, and a flowing space is formed between the second shell and the third shell. The air inlet pipe and the air outlet pipe are respectively communicated with the flowing space, so that extracted air can sequentially flow along the air inlet pipe, the flowing space and the air outlet pipe. Low-temperature media are placed in the medium space and the medium cavity at the same time, cold faces are formed on the inner wall of the second shell and the outer wall of the third shell, namely, double cold faces are formed in the flowing space, the area of the cold faces in the flowing space is enlarged, and the contact area of the cold faces and gas flowing through the flowing space is enlarged. Furthermore, gas molecules flowing through the flowing space are captured, the adsorption capacity of the cold trap is improved, and the vacuumizing efficiency is improved.

A testing device for measuring oil, gas and water contents in rock has a heating desorption unit that has a sample chamber for placing a rock sample to be detected, a crushing mechanism arranged within the sample chamber, and a heating mechanism. The heating desorption unit crushes and heats the rock sample in a sealed manner to achieve gas analysis and desorption analysis of oil and water contained therein, thus obtaining components to be detected. The device further has a cold trap collection unit in communication with the sample chamber, a light hydrocarbon capture unit in communication with the cold trap collection unit, a gas measuring unit in communication with the light hydrocarbon capture unit for measuring and calculating a gas volume; and a central control unit for controlling the testing device.

The utility model discloses a process parameter experiment and selection device for harmless treatment of chemical waste salt, which comprises a reaction furnace, a movable reaction device, a gas inlet pipe, a gas cylinder, a gas outlet pipe, a cold trap and a gas analyzer, the movable reaction device is mounted at an opening in the lower end of the reaction furnace through a sealing flange, and comprises a sample bearing part for feeding a sample into the reaction furnace; a gas inlet pipe is arranged in the movable reaction device, and the gas cylinder is connected with a gas inlet of the gas inlet pipe and used for inputting reaction atmosphere into the reaction furnace; gas generated by the reaction of the sample in the reaction furnace is output through an upper end gas outlet pipe; the cold trap is used for cooling and filtering gas generated by reaction; and the gas analyzer is connected with the cold trap and is used for performing component analysis on the gas filtered by the cold trap. According to the utility model, technological parameters of harmless treatment can be quickly determined by using a small amount of waste salt.

The invention relates to a preparation method of antimony pentafluoride, which comprises the following steps: preheating raw material gas nitrogen trifluoride, placing nitrogen trifluoride and antimony powder in a tubular furnace reactor made of a specific material, carrying out gradient heating reaction at 300-400 DEG C under the condition that the antimony powder is distributed by adopting a multi-layer nickel plate tiled structure, carrying out reaction for 10-40 seconds, and carrying out solid filtration through a filter after the reaction is completed, so as to obtain the antimony pentafluoride. And carrying out cold trap collection to obtain an antimony pentafluoride product. The diameter of the reactor is made of a nickel material or Monel to prevent corrosion of antimony pentafluoride, the number of tiled layers of nickel plates is r / 5-r / 10, the contact area is increased, the reaction yield is increased, and the utilization rate of the raw material nitrogen trifluoride is increased.

The invention discloses a method for synergistically extracting vanadium oxytrichloride, gallium trichloride and iron-titanium alloy from vanadium slag, and belongs to the field of recycling of complex multi-metal resources. The method comprises the following steps: uniformly mixing the gallium-containing vanadium slag, carbon and chlorinated waste salt according to a certain proportion, and carrying out vacuum melting treatment to obtain a Fe-Ti alloy; then chlorine is introduced for chlorination treatment, and a gaseous product is obtained; the gaseous product is adsorbed by a molecular sieve with a function of selectively adsorbing VOCl3 to obtain VOCl3, and then GaCl3 is obtained through a cold trap. According to the method, efficient collaborative conversion and recovery of multi-metal resources of vanadium, gallium, iron and titanium in the vanadium slag are achieved, and the problems that multi-metal collaborative extraction in existing vanadium slag is difficult, and the separation efficiency is low can be effectively solved.

The invention relates to the field of modern processing of traditional Chinese medicines, and particularly provides a low-temperature crushing preparation process and application of a traditional Chinese medicine composition. According to the process, medicinal materials are pre-frozen at the temperature of-40 DEG C to-30 DEG C to be subjected to glassy transition, and the synergistic effect of vortex airflow crushing and a high-frequency ultrasonic field under the protection of liquid nitrogen is combined, so that the crushing temperature is controlled to be less than or equal to-30 DEG C, and the ultrafine particle size D90 is less than or equal to 15 microns. Meanwhile, a three-stage gradient cold trap (-80 DEG C,-120 DEG C and-196 DEG C) is adopted to recover volatile components, and a surface modifier is immediately added after crushing to inhibit powder agglomeration. The process solves the problems of degradation of thermosensitive components, dissipation of volatile components, overlarge particle size and the like in traditional crushing, so that the retention rate of the thermosensitive components is greater than or equal to 95%, the volatile loss rate is less than or equal to 3%, and the dissolution rate is increased by 2.8 times or more. The obtained powder can be directly applied to acupoint application, powder inhalation and transdermal preparations, and the requirements of a novel drug delivery system are met.

The invention discloses a detection method for an ODS detection system, which comprises the following steps: S1, sample introduction trapping: a first cold trap is at a first temperature, and the first cold trap traps all ODS in a sample gas; s2, first desorption: the second cold trap is at a second temperature, the first cold trap is heated to a third temperature, ODS with the boiling point smaller than or equal to the boiling point of CO2 in the first cold trap is desorbed out, CO2 adsorption is conducted through a CO2 adsorption pipe, and the ODS desorbed out of the first cold trap after adsorption through the CO2 adsorption pipe is focused through the second cold trap; s3, secondary analysis: heating the first cold trap to a fourth temperature, analyzing the remaining ODS in the first cold trap, and focusing the remaining ODS in the first cold trap by the second cold trap; and S4, injection: heating the second cold trap to a fifth temperature, analyzing all ODS in the second cold trap, and injecting the ODS into the GCMS detection device. The method has the advantages of high test precision and high test accuracy.

The present disclosure relates to a measuring method and device for trace and ultra-trace oil content. The measuring device of the present disclosure includes a cryogenic enriching device, an extracting device and an infrared spectrometer; The cryogenic enriching device includes a Dewar container and a U-shaped pipe; The extracting device includes an extractant container, an input pipe, an outlet pipe and an extraction liquid quantitative pipe; A mass flowmeter is further disposed on the U-shaped pipe, the oil content in the gas is calculated according to the measured total mass of the gas and the oil concentration of the extraction liquid measured by the infrared spectrometer. The present disclosure further provides a measuring method, which converts the measurement of oil content in gas into the measurement of oil concentration in liquid extractant through effective extraction by liquid nitrogen cold trap enrichment mode, and adopts infrared spectrophotometry to accurately measure.

The invention discloses a method for determining carbon isotopes of low-concentration soluble organic carbon in a water body, and belongs to the technical field of organic carbon detection. The determination method comprises the following steps: combining a TOC analyzer and a stable isotope mass spectrometer, and converting DOC in a water body into CO2 gas by adopting the TOC analyzer; cO2 gas generated by the TOC analyzer is enriched for the first time through the cold trap T1; the CO2 gas frozen by the cold trap T1 is enriched for the second time through a cold trap T2; introducing the CO2 subjected to secondary enrichment into a stable isotope mass spectrometer, and determining the carbon isotope composition of the CO2. Aiming at a low-concentration DOC water body, the carbon isotope composition of DOC in the water body is determined on the basis of combination of a wet oxidation technology and stable isotope mass spectrometry detection, a wet oxidation method is used for increasing the volume of a water sample to generate more CO2 for stable isotope mass spectrometry determination, so that more accurate carbon isotope composition is obtained, and the method is efficient, time-saving, labor-saving and accurate.

The utility model relates to a cold trap device capable of generating high pressure in situ, which comprises a cold trap barrel body, an air inlet pipe, an air inlet pipe vacuum valve, an air outlet pipe, an air outlet pipe vacuum valve and a pressure gauge, and is characterized in that the cold trap barrel body is arranged in a liquid nitrogen Dewar; the device can utilize a low-temperature environment created by the liquid nitrogen Dewar to form a low-temperature space capable of effectively compressing or liquefying gas in the cold trap barrel body, so that the gas entering the cold trap barrel body is compressed or converted into a liquid state, and the internal temperature of the gas gradually rises along with the slow removal of the cold trap barrel body from the liquid nitrogen environment; the previously compressed or liquefied gas begins to expand, creating a higher pressure. External impurities are not introduced, extra energy input is not needed, energy consumption is reduced, the environmental protection performance is improved, and the operation efficiency of the whole system can be remarkably improved.

The freeze-drying system comprises a freeze-drying tank and a cold trap, an annular heat conduction clamping sleeve and a material sleeve are arranged in the freeze-drying tank, a plurality of heat conduction partition plates are arranged between the annular heat conduction clamping sleeve and the material sleeve, and the heat conduction partition plates are arranged in the circumferential direction of the annular heat conduction clamping sleeve at intervals; a material drying cavity is formed between every two adjacent heat conduction partition plates, the cold trap communicates with the material drying cavities, and a material guiding and homogenizing assembly is arranged between the material drying cavities and a feeding port of the freeze-drying tank and used for uniformly distributing materials into the material drying cavities. And a material blocking assembly is arranged between the material drying cavity and the material outlet of the freeze-drying tank. The drying device has the advantages that material accumulation can be avoided, and the drying effect is improved.

The invention relates to a synthesis method of chlorine trifluoride, which comprises the following steps: S1, connecting a cold trap with a gas outlet of a metal pipeline of a reactor, adding a metal chloride into the reactor, with the addition amount of the metal chloride being two thirds of that of the reactor, and maintaining the pressure; s2, cooling to-100 DEG C to-60 DEG C by a cold trap; s3, the metal pipeline of the reactor is heated to 850-1000 DEG C; s4, starting to introduce fluorine gas, and stopping introducing the fluorine gas when the pressure reaches 3.5 MPa; s5, after reacting for 1-2 hours, opening an outlet valve of the reactor, and collecting through a cold trap; s6, after collection is completed, the temperature of the cold trap is increased to-20 DEG C to 0 DEG C, an emptying opening is opened, and the emptying opening is closed after 5-20 min. The raw materials are simple, and the conversion rate can be effectively improved.

The application discloses a kind of electronic grade metal organic precursor vacuum rectification device and method, it is related to rectification technical field, device includes raw material tank, rectification tower, crude product tank, product tank, sampling filling glove box, vacuum pump and cold trap;The raw material tank production pipe is connected with rectification tower kettle;The rectification tower top product sampling outlet is connected with production pipeline, and production pipeline is connected with crude product tank and product tank import, and the crude product tank and product tank are connected with nitrogen and vacuum pipeline;The vacuum pipeline is connected with cold trap, and cold trap is connected with vacuum pump;The product tank feed pipeline is connected with sampling filling glove box;Method ensures that the pressure in crude product tank is lower than the pressure of crude product tank material sampling outlet and the pressure in product tank is lower than the pressure of product tank material sampling outlet.The application can effectively solve the problem that metal organic precursor is difficult to be industrialized and continuously produced in the process of rectification, with higher operating temperature, faster decomposition, lower product purity and greater difficulty in vacuum rectification.

The application relates to a method for synthesizing and refining electronic-grade hexachloroethyldisilane, and specifically, trichlorosilane raw material is mixed with protective gas into a raw material buffer tank, a mixed gas obtained through the mixing is subjected to a catalytic synthesis reaction under the irradiation of an ultraviolet light source, a product obtained through the reaction is subjected to condensation separation, gaseous trichloromethane returns to the raw material buffer tank to continuously participate in the synthesis reaction, the mixed liquid in the cold trap is warmed and vaporized, hexachloroethyldisilane is obtained through two-step refining, and the purity of the product hexachloroethyldisilane can reach the electronic grade. The application takes trichlorosilane as the initial raw material, the price of the raw material is low; the photo-catalysis is used as the synthesis process, the synthesis process is simple, the reaction yield is high, energy is saved, and the environment is protected; the two-step method is used for refining and purifying the product, the depth of the refining and the efficiency of the refining are high, large-scale production is suitable, the monopoly of foreign enterprises is broken, and the application has important significance.

The utility model provides a system for improving the vacuum degree of a single acid distillation tower. Comprising a first single acid distillation tower, a second single acid distillation tower, a first acid condenser, a second acid condenser, a third acid condenser, a first acid jet vacuum pump, a second acid jet vacuum pump, a third acid jet vacuum pump, a fourth acid jet vacuum pump, a first acid cold trap, a second acid cold trap, an acid hot well, a glycerin distillation tower, a glycerin condenser, a first oil jet vacuum pump, a second oil jet vacuum pump and a third oil jet vacuum pump. 4, an oil injection vacuum pump and an oil hot well; when vacuum is started, the first single-acid distillation tower and the second single-acid distillation tower are gathered to one pipeline and connected to the glycerin distillation vacuum system, and the vacuum degree of the single-acid distillation system is improved through the glycerin distillation vacuum system; the vacuum degree of the single-acid tower is improved, the purpose of distilling and separating high-boiling-point materials is achieved, the utilization rate of the single-acid tower is improved, the tower kettle temperature of the single-acid tower is reduced after vacuum is improved, damage of high temperature to the single-acid tower is reduced, and the natural gas usage amount of the single-acid tower is reduced.

The utility model relates to a compact integrated freeze dryer which is provided with a shell, a vacuum bin, a vacuum pump and a compressor are arranged in the shell, a freeze-drying chamber and a cold trap are arranged in the vacuum bin, the freeze-drying chamber is arranged on the upper portion of the cold trap and communicated with the cold trap, a heating device is arranged on a freeze-drying frame in the vacuum bin, and the compressor is connected with a condensation pipe in the cold trap. The vacuum pump is connected with the vacuum bin. According to the utility model, a novel heating structure is adopted, the heating device is directly arranged at the lower part of the freeze-drying rack layer plate, materials on the freeze-drying rack are directly heated, the space is effectively saved, the loss of heat transfer is reduced, the structure of the existing freeze-drying machine is integrated, the internal structure depends on the vacuum bin design, and the cold trap is arranged at the lower part of the freeze-drying chamber, so that the heat transfer efficiency is improved. And the vacuum pump and the compressor are arranged on the bottom plate at the side part of the vacuum bin, so that the whole freeze dryer is closer to a square suitable for household use, and the size of the freeze dryer is greatly reduced.

The utility model provides a vacuum tail gas cold trap, and belongs to the technical field of tail gas treatment. The problem that an existing tail gas treatment cooling effect is poor is solved. The vacuum tail gas cold trap comprises a shell with a liquid outlet in the bottom, a heat exchange pipe arranged in the shell, a barrel body fixedly connected in the shell and an air inlet pipe, an air outlet is formed in the top of the shell, an air inlet is formed in the bottom of the shell, the top of the barrel body is blocked, and an opening is formed in the bottom of the barrel body. A first gas passing channel for tail gas to pass through is arranged between the outer peripheral wall of the barrel body and the inner peripheral wall of the shell, the bottom of the gas inlet pipe is communicated with the gas inlet of the shell, the top of the gas inlet pipe extends into the top in the barrel body from the bottom of the barrel body, and a second gas passing channel for tail gas to pass through is arranged between the outer peripheral wall of the gas inlet pipe and the inner peripheral wall of the barrel body; part of the heat exchange pipe is located in the first air passing channel, and the other part is located in the second air passing channel. The vacuum tail gas cold trap has the advantage of improving the cooling effect of tail gas.

The invention relates to the field of vacuum technology and low-temperature engineering, and discloses a low-temperature cold trap device and a vacuum system.The low-temperature cold trap device comprises a shell provided with an extraction opening; the adapter piece is communicated with the shell and is provided with a channel which can be opened or closed; the condensation assembly is arranged in the shell; the cold source is arranged on the shell and exchanges heat with the condensation assembly; the driving mechanism is arranged on the shell and used for driving the condensation assembly to enter and exit from the shell along the channel. The driving mechanism drives the condensation assembly to enter and exit from the shell along the channel, the low-temperature cold trap device can be arranged in the air exhaust pipeline to achieve high cold trap working efficiency during working, the cold trap can be moved out of the air exhaust pipeline during regeneration, shutdown of the air exhaust pipeline is avoided, air exhaust work is not affected, and the service life of the low-temperature cold trap device is prolonged. Therefore, the air exhaust efficiency and the air exhaust performance of the air exhaust pipeline can be ensured.

The invention provides a detection method for improving detection of terpene substances in yeast for making hard liquor, and relates to the field of flavor analysis of fermented food. The method comprises the following steps: 1) performing crushing pretreatment on a target yeast block to obtain yeast powder; 2) taking absolute ethyl alcohol as a solvent, performing water bath rotary evaporation on the yeast powder at 40-60 DEG C, filtering after rotary evaporation, retaining solid-phase yeast powder, and performing vacuum drying to obtain a dried yeast powder sample; (3) collecting a gas-phase sample with stable components volatilized from the yeast powder sample under the conditions of water bath heating and nitrogen purging; (4) pre-concentrating the gas-phase sample by adopting a multi-stage cold trap principle, wherein the enrichment multiple of the gas-phase sample is not less than 1000 in the pre-concentration; 5) collecting the pre-concentrated gas phase sample, inputting the pre-concentrated gas phase sample into a gas chromatograph-mass spectrometer for gas chromatography-mass spectrometry, and determining the terpene substances in the yeast for making hard liquor through standard gas matching. Compared with the prior art, the method has the advantages that 12 terpene substances can be simply and efficiently detected at a time, and the detection rate of the terpene substances is remarkably increased.

The application belongs to the technical field of salt solution drying, and particularly relates to a continuous evaporation and drying device for triflic acid salt solution. The device comprises a raw material tank, a feeding pump, a recovery cold trap, a vacuum pump, a cyclone separator, two-stage thin film evaporators, a screw conveyor, a material bin and a heat conducting oil furnace, and a continuous material flow path, a gas phase condensation recovery path and a circulating heating path are formed through pipelines. The scheme limits the operation parameters of the two-stage evaporators, such as the operating pressure, temperature and scraper rotating speed, and clearly defines the heat exchange feeding design of the recovery cold trap, the gas velocity of the cyclone separator and the powder backflow structure, is suitable for multiple solvent systems and various corrosion-resistant materials, and the material bin adopts a closed structure with nitrogen protection, and multiple bins can be connected in parallel to switch feeding. The application realizes continuous drying of triflic acid salt, improves production efficiency, product quality and yield, reduces energy consumption and improves solvent recovery rate through waste heat recovery.

The utility model belongs to the technical field of photovoltaic power generation, and discloses an anti-corrosion cold shield of evaporation equipment for preparing perovskite materials by a full-dry method, the evaporation equipment comprises an evaporation source, and perovskite material molecules are evaporated by the evaporation source. The anti-corrosion cold shield comprises a vacuum cavity, a cold shield plate, a cold shield plate fixing column, a vapor chamber, a low-temperature pump, a refrigerant pipe, a vapor chamber fixing column and a cold trap. The cold shield plate comprises a plate main body, the edge of the cold plate main body is provided with a bending part, and the bending part is bent towards the low-temperature pump. The low-temperature pump is protected through the anti-corrosion cold shield plate, maintenance of the low-temperature pump is reduced, cost is saved, and efficiency is improved.

The invention belongs to the technical field of ocean in-situ monitoring, and relates to a gas measuring device and method suitable for ocean in-situ long-term monitoring. The device comprises a gas-liquid separation module, a dehumidification module, a detection module and a calibration module which are arranged in a pressure-resistant cabin, two water through holes are oppositely formed in the pressure-resistant cabin; two ends of a degassing pipe in the gas-liquid separation module are respectively communicated with the two water ports, one end of the degassing pipe is provided with a water pump, and sample gas separated by the degassing pipe enters the dehumidification module through a gas outlet; the dehumidification module comprises a Nafion tube, a cold trap and a drying tube which are connected in sequence, and a refrigeration sheet is attached to the cold trap; a gas detector in the detection module is connected with the drying pipe through a sample gas pipe, a gas pump and a normally open solenoid valve are arranged on the sample gas pipe, and gas detected by the gas detector returns to the degassing pipe through a Nafion pipe; and the calibration module is connected to the sample gas pipe behind the normally open solenoid valve. The device can accurately, stably and continuously monitor the concentration of a specified type of gas in seawater, and can meet the requirement of ocean in-situ long-term monitoring.

The application discloses a quantitative analysis method of tobacco medium-polarity VOCs, which comprises the following steps: S1, inert gas is used to purge tobacco, and meanwhile, the tobacco is heated and sampled, so that the medium-polarity VOCs in the tobacco are collected; and S2, the medium-polarity VOCs in the tobacco are enriched by using MWCNTs-COOH / rGO, then, the medium-polarity VOCs are subjected to thermal desorption, and then, the medium-polarity VOCs are subjected to secondary enrichment and secondary analysis by using a cold trap, and finally, the medium-polarity VOCs are subjected to quantitative analysis by using GC-MS. When the MWCNTs-COOH / rGO is used as the adsorption medium of the thermal desorption of the purge and trap method, the flow rate, time and secondary enrichment temperature of the inert gas purging during the enrichment of the medium-polarity VOCs in the tobacco are simultaneously controlled, so that the quantitative analysis method of the medium-polarity VOCs in the tobacco is established. The enrichment effect of the medium-polarity VOCs in the tobacco is improved, and the accuracy of the quantitative analysis of the medium-polarity VOCs in the tobacco is also improved.

1. The name of the design product: mass spectrometer cold trap. 2. The use of the design product: to provide an ultra-low temperature environment for the container, for material capture and enrichment. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.