Circulating nitrogen blowing experiment device

Abstract

The utility model provides a circulating type nitrogen blowing experiment device which is characterized in that a gas outlet of a nitrogen generating device is communicated with a peristaltic pump through a gas inlet pipe, a hose at the other end of the peristaltic pump is connected to the top of a sealed reactor, and the side surface of the sealed reactor is connected with a gas filtering device through a gas outlet pipe; the nitrogen circulating device comprises a circulating pump and a circulating pipe, one end of the circulating pipe is connected with the gas filtering device, the other end of the circulating pipe is connected with the gas inlet pipe of the peristaltic pump, and the circulating pump is arranged on the circulating pipe and conveys filtered nitrogen back to the gas inlet pipe; a first fixing frame and a second fixing frame are arranged on the upper portion and the lower portion in the sealed reactor respectively, a plurality of inserting holes are formed in the first fixing frame and used for fixing nitrogen blowing needles, a plurality of inserting holes are formed in the second fixing frame and used for fixing test tubes, the fixed nitrogen blowing needles correspond to the lower test tubes one to one, and a constant-temperature metal bath is arranged at the bottommost portion of the sealed reactor. By utilizing the device, simultaneous nitrogen blowing of a plurality of groups of samples can be carried out, cyclic utilization of nitrogen is realized, and the experiment cost is reduced while the nitrogen blowing efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of experimental equipment, and particularly relates to a circulating nitrogen blowing experimental device. Background Art

[0002] The nitrogen blowing technology is a technology that uses nitrogen to evaporate the solvent on the surface of liquid reagents. By introducing nitrogen into a container to form an air flow, the solvent on the surface of the liquid reagent in the container is evaporated, so as to realize the concentration of samples or the removal of solvents. This technology is widely used in industries such as pesticide residue analysis, commodity inspection, food, environment, pharmacy, biological products, etc. and sample preparation in liquid phase, gas phase and mass spectrometry analysis. The nitrogen blowing technology mainly uses the rapid flow of nitrogen to break the gas-liquid equilibrium above the liquid, so that the liquid evaporation speed is accelerated. At the same time, the temperature is increased by dry heating or water bath heating methods (the boiling point of the target substance is generally higher than that of the solvent), so as to achieve the purpose of anaerobic concentration of samples and keep the samples purer. In addition, nitrogen, as an inert gas, can play a role in isolating oxygen and preventing sample oxidation.

[0003] However, in the traditional equipment during the nitrogen blowing process, nitrogen cannot be effectively recycled, and nitrogen is excessively consumed during the experiment, seriously increasing the experimental treatment cost and having a low nitrogen blowing efficiency. How to improve the nitrogen blowing sample treatment efficiency under laboratory conditions is an urgent problem to be solved. Summary of the Utility Model

[0004] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a circulating nitrogen blowing experimental device, which can be used to simultaneously perform nitrogen blowing treatment on multiple groups of samples, and realizes the recycling of nitrogen, while improving the nitrogen blowing efficiency and reducing the experimental cost.

[0005] The purpose of the utility model is realized by the following technical solutions:

[0006] A circulating nitrogen blowing experimental device includes a nitrogen generation device, a peristaltic pump, a sealed reactor, a gas filtering device and a nitrogen recycling device;

[0007] The air outlet of the nitrogen generation device is connected to the peristaltic pump through an air inlet pipe, the hose at the other end of the peristaltic pump is connected to the top of the sealed reactor, and the side of the sealed reactor is connected to the gas filtering device through an air outlet pipe; the nitrogen recycling device includes a circulation pump and a circulation pipe. One end of the circulation pipe is connected to the gas filtering device, and the other end is connected to the air inlet pipe of the peristaltic pump. A circulation pump is arranged on the circulation pipe, and the circulation pump transports the nitrogen filtered and processed by the gas filtering device back to the air inlet pipe.

[0008] Inside the sealed reactor, a first fixing rack and a second fixing rack are respectively arranged at the upper and lower parts. A number of jacks are arranged on the first fixing rack for fixing the nitrogen blowing needles, and a number of jacks are arranged on the second fixing rack for fixing the test tubes. Moreover, the fixed nitrogen blowing needles correspond to the lower test tubes one by one, and the bottom of the sealed reactor is a constant temperature metal bath.

[0009] Furthermore, the peristaltic pump is a multi-channel peristaltic pump.

[0010] Furthermore, gas flow meters are arranged on both the device inlet pipe and the circulation pipe.

[0011] Furthermore, the gas filtration device is a Hepa gas filter.

[0012] Furthermore, a sealed door is arranged on one side of the sealed reactor.

[0013] The beneficial effects of the present utility model compared with the prior art are as follows:

[0014] 1. The circulating nitrogen blowing experimental device of the present utility model can achieve environmental protection and energy conservation: significantly reduce nitrogen emissions, contribute to reducing air pollution, and achieve the goals of energy conservation and emission reduction. Compared with traditional nitrogen blowing instruments, the nitrogen blowing instrument with recycling can reduce nitrogen consumption, thereby reducing energy consumption and carbon emissions. The nitrogen recycling technology improves the utilization rate of nitrogen, reduces production costs, and improves economic benefits. The nitrogen recycling technology can improve the purity and stability of nitrogen, and further improve product quality.

[0015] 2. The circulating nitrogen blowing experimental device of the present utility model performs excellently in maintaining nitrogen purity, can simultaneously perform nitrogen blowing treatment on multiple groups of samples, and helps to ensure the accuracy and reliability of sample treatment. It is easy to operate and convenient to maintain: the application of nitrogen recycling technology helps to promote sustainable development and conforms to the development concept of green and low-carbon. In different industries and fields, the circulating nitrogen blowing experimental device can play its advantages in nitrogen utilization and sample treatment. Description of the Drawings

[0016] The following further illustrates the present utility model in conjunction with the drawings and embodiments:

[0017] Figure 1 is the structural schematic diagram of the circulating nitrogen blowing experimental device; among them, the arrow represents the gas flow direction;

[0018] Figure 2 is the front view structural schematic diagram of the sealed door of the sealed reactor. Detailed Embodiments

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0020] Embodiment 1

[0021] As Figure 1 shown, this embodiment provides a cyclic nitrogen blowing experimental device, which includes a nitrogen generating device 1, a peristaltic pump 2, a sealed reactor 3, a gas filtering device 4, a nitrogen circulation device and a gas flowmeter 8; the outer shell of the sealed reactor 3 is made of acrylic, glass or plexiglass, and a sealed door 306 is provided on one side thereof, and the gas filtering device 4 is a Hepa gas filter.

[0022] The air outlet 1 of the nitrogen generating device is connected to the peristaltic pump 2 through an air inlet pipe, the hose at the other end of the peristaltic pump is connected to the top of the sealed reactor 3, and the side of the sealed reactor is connected to the gas filtering device through an air outlet pipe; the nitrogen circulation device includes a circulation pump 5 and a circulation pipe 6, one end of the circulation pipe is connected to the gas filtering device, and the other end is connected to the air inlet pipe of the peristaltic pump. A circulation pump is provided on the circulation pipe, and the circulation pump transports the nitrogen filtered by the gas filtering device back to the air inlet pipe.

[0023] A first fixing frame 301 and a second fixing frame 302 are respectively arranged inside the sealed reactor 3 from top to bottom. A plurality of jacks are arranged on the first fixing frame for fixing the nitrogen blowing needle 303, and a plurality of jacks are arranged on the second fixing frame for fixing the test tube 304. And the fixed nitrogen blowing needles correspond to the lower test tubes one by one, and the bottom of the sealed reactor is a constant temperature metal bath 305, which can realize temperature control from room temperature +5°C to 100°C.

[0024] In this embodiment, the peristaltic pump is a six-channel peristaltic pump, and gas flowmeters 8 are arranged on both the air inlet pipe and the circulation pipe of the device.

[0025] The usage method of the cyclic nitrogen blowing experimental device in this embodiment is as follows:

[0026] Open the sealing door 306 on one side of the sealed reactor 3, place the test tube 304 containing the sample to be nitrogen blown on the second fixing rack 302, and close the sealing door 306. According to the experimental design, set the temperature of the constant temperature metal bath 305 to control the nitrogen blowing temperature, adjust the flow rate value of the peristaltic pump 2, turn on the vacuum circulation pump 6, observe the pressure gauge, and wait for the negative pressure condition to be stable. The nitrogen generated by the nitrogen generating device 1 passes through each nitrogen blowing needle to evenly blow the nitrogen over the surface of the sample in the test tube. The sample solvent evaporated after nitrogen blowing treatment and part of the remaining nitrogen are filtered through the Hepa filter 4 to avoid air pollution caused by solvent emission. The circulation pump 5 transports the nitrogen filtered by the Hepa filter back to the intake pipe, and the nitrogen is recycled in the device. The gas flow rate of the nitrogen generating device 1 can be adjusted according to specific experimental conditions, saving nitrogen consumption during the nitrogen blowing process and improving the nitrogen blowing efficiency of the sample.

[0027] Before performing liquid chromatography - mass spectrometry detection on PFASs extracted with organic solvents, use the cyclic nitrogen blowing experimental device described in this embodiment to perform nitrogen blowing treatment on the samples. Accurately measure 5 mL of the organic solvent extract into the test tube 304, place the test tube containing the sample on the second fixing rack 302 in the sealed reactor 3 of the nitrogen blowing device, set the temperature of the constant temperature metal bath 305 to 45 - 60 °C, the nitrogen blowing flow rate to 1 mL / min, blow until the solution volume is 1 mL and take it out for injection analysis. Calculate the nitrogen blowing recovery rate according to the proportion of the measured value to the standard addition amount. Table 1 shows some experimental data.

[0028] Table 1 Nitrogen Blowing Experimental Design

[0029]

[0030] Finally, it should be noted that the above is only used to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred arrangement, those of ordinary skill in the art should understand that the technical solution of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A cyclic nitrogen blowing experimental device, characterized in that, The device includes a nitrogen generation device (1), a peristaltic pump (2), a sealed reactor (3), a gas filtration device (4) and a nitrogen circulation device; The gas outlet of the nitrogen generation device is communicated with the peristaltic pump (2) through an intake pipe. The hose at the other end of the peristaltic pump is connected to the top of the sealed reactor (3). The side of the sealed reactor is connected to the gas filtration device through an outlet pipe. The nitrogen circulation device includes a circulation pump (5) and a circulation pipe (6). One end of the circulation pipe is connected to the gas filtration device, and the other end is connected to the intake pipe of the peristaltic pump. A circulation pump is provided on the circulation pipe, and the circulation pump transports the nitrogen filtered by the gas filtration device back to the intake pipe; A first fixing frame (301) and a second fixing frame (302) are respectively arranged at the upper and lower parts inside the sealed reactor (3). A number of jacks are provided on the first fixing frame for fixing nitrogen blowing needles (303), and a number of jacks are provided on the second fixing frame for fixing test tubes (304). And the fixed nitrogen blowing needles correspond to the lower test tubes one by one, and the bottom of the sealed reactor is a thermostatic metal bath (305).

2. The cyclic nitrogen blowing experimental device according to claim 1, characterized in that, The peristaltic pump (2) is a multi-channel peristaltic pump.

3. The cyclic nitrogen blowing experimental device according to claim 1, characterized in that, Gas flow meters (8) are provided on both the intake pipe and the circulation pipe of the device.

4. The cyclic nitrogen blowing experimental device according to claim 1, wherein The gas filtration device (4) is a Hepa gas filter.

5. The cyclic nitrogen blowing experimental device according to claim 1, wherein A sealed door (306) is provided on one side of the sealed reactor (3).

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