In-situ chemical reaction monitoring device of ultraviolet-visible spectrometer

Abstract

The utility model relates to an ultraviolet-visible spectrograph in-situ monitoring chemical reaction device which comprises an ultraviolet-visible spectrograph, a magnetic stirrer arranged in the ultraviolet-visible spectrograph, and a cuvette positioned in the magnetic stirrer, wherein a gas inlet of the cuvette is communicated with a gas cylinder through a gas inlet pipeline; gas outlets of the cuvettes are communicated through a gas outlet pipeline, the gas inlet pipeline is connected with the gas cylinder through a pressure reducing valve, and a flow meter for detecting the flow of gas flowing into the cuvettes is arranged on the gas inlet pipeline; an LED light source used for stimulating the reaction is placed at the position, perpendicular to the spectrograph in the forward direction, of the cuvette, the gas-liquid two-phase reaction under illumination occurs in the cuvette, in-situ monitoring is conducted, the in-situ monitoring accuracy of the gas-liquid reaction is improved, and the situation change of the illumination on the gas-liquid reaction can be visually observed.

Description

Technical Field

[0001] This application relates to the field of ultraviolet spectrometer testing technology, specifically to an in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer. Background Technology

[0002] In existing technologies, ultraviolet-visible absorption spectroscopy is generated by the absorption of light in the 200-800 nm spectral region by molecules in a substance. This molecular absorption spectrum arises from the transitions between valence electrons and electrons in molecular orbitals at electronic energy levels (electrons in atoms or molecules are always in a certain state of motion. Each state has a certain energy and belongs to a certain energy level. These electrons, due to various reasons (such as excitation by light, heat, or electricity), move from one energy level to another, which is called a transition. When these electrons absorb energy from external radiation, they transition from a lower energy level to a higher energy level. Therefore, each transition corresponds to the absorption of a certain amount of energy radiation. Various substances with different molecular structures exhibit selective absorption characteristics of electromagnetic radiation. Spectrophotometry is based on this selective absorption characteristic of substances to electromagnetic radiation; it belongs to molecular absorption spectroscopy.

[0003] Currently, ultraviolet-visible spectroscopy can be used to study the complexation between metal ions and organic ligands, and can also be used for the analysis and detection of organic compounds, and can provide quantitative analysis. However, it cannot accurately and effectively present the reaction process. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the main objective of this utility model is to provide an in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer that can accurately present the progress of chemical reactions.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer, comprising an ultraviolet-visible spectrometer, a magnetic stirrer disposed within the ultraviolet-visible spectrometer, a cuvette located within the magnetic stirrer, the gas inlet of the cuvette being connected to a gas cylinder via an inlet pipeline, the gas outlet of the cuvette being connected via an outlet pipeline, the inlet pipeline being connected to the gas cylinder via a pressure reducing valve, a flow meter for detecting the flow rate of gas into the cuvette being provided on the inlet pipeline, and an LED light source for stimulating the reaction being placed at a position perpendicular to the ultraviolet-visible spectrometer.

[0006] Preferably, the outlet end of the air outlet pipeline is connected to the ventilation duct.

[0007] Preferably, the cuvette is located directly in front of or behind the visible and ultraviolet light in the ultraviolet-visible spectrometer.

[0008] Preferably, the ultraviolet-visible spectrometer is a Spector S600.

[0009] Preferably, the mouth of the cuvette is sealed with a sealing plug.

[0010] Preferably, the cuvette is fixed in the magnetic stirrer by Blu-Tack.

[0011] Preferably, the end of the air inlet line extends below the liquid in the cuvette, and the end of the air outlet line is located above the liquid in the cuvette.

[0012] Compared with the prior art, when using this invention to detect gas-liquid reactions, the reaction liquid is placed in a cuvette, the gas passage is opened, and the gas enters the cuvette to react with the liquid in the cuvette. During the reaction, the mixture is stirred by a magnetic stirrer, and the entire reaction process is presented through the cuvette, which improves the sensitivity of the gas-liquid reaction and allows for intuitive recording of changes in the gas-liquid reaction. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer in this utility model. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0015] like Figure 1As shown, this embodiment provides an in-situ monitoring device for chemical reactions using a UV-Vis spectrometer, including a UV-Vis spectrometer 1. The UV-Vis spectrometer can be set to measure absorbance at regular intervals for in-situ monitoring. A magnetic stirrer 2 is located inside the UV-Vis spectrometer 1, and a cuvette 3 is located inside the magnetic stirrer 2. Since the cuvette 3 needs to be firmly fixed on the magnetic stirrer 2, if the position of the cuvette 3 shifts, according to Lambert-Beer's law, the absorbance will also change, leading to a change in concentration. Therefore, the cuvette 3 is fixed to the center position of the magnetic stirrer 2 using Blu-Tack. During magnetic stirring, the magnetic beads of the magnetic stirrer 2 are placed into the cuvette. In step 3, the magnetic stirrer 2 drives the magnetic beads to fully stir the liquid in the cuvette 3. The gas inlet of the cuvette 3 is connected to the gas cylinder 4 through the gas inlet line 5. An LED light source 10 for stimulating the reaction is placed at the position perpendicular to the UV-Vis spectrometer 1. The gas outlet of the cuvette 3 is connected through the gas outlet line 6. Specifically, after the mouth of the cuvette 3 is sealed with a sealing plug, the gas inlet line 5 passes through the sealing plug and extends into the interior of the cuvette 3, extending below the liquid surface in the cuvette 3. The end of the gas outlet line 6 passes through the sealing plug and is located above the liquid surface. In this embodiment, the sealing plug is a rubber sealing plug.

[0016] The gas cylinder 4 is connected to the gas inlet line 5 via a pressure reducing valve 7. In this embodiment, the gas cylinder 4 is used to hold the gas that reacts with the liquid in the cuvette 3. The gas inlet line 5 connects the gas cylinder 4 and the cuvette 3 to ensure that the gas can enter the cuvette 3. The pressure reducing valve 7 connects the gas cylinder and the gas inlet line 5 to control the amount and flow rate of the gas entering the cuvette 3. A flow meter 8 is provided on the gas inlet line 5 to detect the flow rate of the gas entering the cuvette 3. Specifically, the gas in the gas cylinder 4 enters the cuvette 3 through the gas inlet line 5. The flow meter 8 determines the amount of gas entering the cuvette 3. When the flow rate is too high or too low, the pressure reducing valve 7 makes corresponding adjustments. The light intensity that stimulates the reaction is controlled and adjusted by the LED light source 10.

[0017] In another embodiment, the outlet end of the exhaust pipe 6 is connected to the fume hood 9. The reacted gas enters the fume hood 9 through the exhaust pipe 6 and is processed by the fume hood 9, thus preventing the reacted gas from entering the sealed environment and causing environmental pollution.

[0018] In practice, when monitoring only the gas-liquid two-phase reaction, the airtightness of the gas path interface is checked first, i.e., whether there is any leakage in the pipeline between gas cylinder 4 and cuvette 3. Then, the UV-Vis spectrometer 1 is turned on and connected to the computer using dedicated software. In this embodiment, the UV-Vis spectrometer 1 is a Spector S600 model, which comes with its own operating software. Since the software is included with the UV-Vis spectrometer, it will not be described in detail here. In the software, the UV and visible light of the UV-Vis spectrometer are turned on, and then adjustments are made, solvent reference is eliminated, and the test is set to be performed every 2 seconds. Then, the reaction solution and a small magnetic stirrer are poured into cuvette 3, and the magnetic stirrer 2 is started. Gas cylinder 4 is then turned on, and the light intensity stimulating the reaction is adjusted by controlling the LED light source 10. The UV-Vis spectrometer 1 is started in the software for testing, and then the flow meter 8 software is opened to set the gas flow rate. The reaction ends when the absorbance at the characteristic peak on the UV software no longer changes.

[0019] For single-phase solution reactions monitored only by light stimulation, the gas cylinder, pressure reducing valve, flow meter, and gas tubing can be removed. The specific operation is as follows: Turn on the UV-Vis spectrometer, connect it to the computer and open the software. In the software, turn on the UV-Vis spectrometer, then turn on the LED light source and adjust the light intensity to stimulate the reaction, ensuring the light source completely illuminates the reaction solution. In this embodiment, the UV and visible light sources of the spectrometer are located directly in front of or behind cuvette 3, and the LED light source is located directly to the left or right of the cuvette. Both must ensure direct projection onto the reaction solution in cuvette 3. Then, adjust the settings, eliminate the solvent reference, and set a test interval of 2 seconds. Next, pour the reaction solution and a small magnetic stirrer into cuvette 3, and then start the magnetic stirrer 2. Start the UV-Vis spectrometer in the UV software for testing. The reaction ends when the absorbance at the characteristic peak on the UV software no longer changes.

[0020] The above embodiments are merely illustrative examples of the present utility model and do not constitute a limitation on the protection scope of the present utility model. All designs that are the same as or similar to the present utility model are within the protection scope of the present utility model.

Claims

1. A device for in-situ monitoring of chemical reactions using an ultraviolet-visible spectrometer, characterized in that, The device includes an ultraviolet-visible spectrometer, a magnetic stirrer inside the ultraviolet-visible spectrometer, a cuvette inside the magnetic stirrer, a gas inlet of the cuvette connected to a gas cylinder via an inlet line, a gas outlet of the cuvette connected to an outlet line via an outlet line, an inlet line connected to the gas cylinder via a pressure reducing valve, a flow meter on the inlet line for detecting the flow rate of gas into the cuvette, and an LED light source for stimulating a reaction at a position perpendicular to the ultraviolet-visible spectrometer.

2. The in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer according to claim 1, characterized in that, The outlet end of the air outlet pipeline is connected to the ventilation duct.

3. The in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer according to claim 1, characterized in that, The cuvette is located directly in front of or behind the visible and ultraviolet light in the ultraviolet-visible spectrometer.

4. The in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer according to claim 1, characterized in that, The ultraviolet-visible spectrometer is a Specord S600.

5. The in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer according to claim 1, characterized in that, The LED light source is a Thorlabs fiber-coupled LED M365FP1.

6. The in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer according to claim 1, characterized in that, The mouth of the cuvette is sealed with a sealing plug.

7. The in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer according to claim 1, characterized in that, The cuvette is fixed in the magnetic stirrer using Blu-Tack.

8. The in-situ monitoring device for chemical reactions using an ultraviolet-visible spectrometer according to claim 1, characterized in that, The end of the air inlet line extends below the liquid in the cuvette, and the end of the air outlet line is located above the liquid in the cuvette.

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