Pretreatment and sampling system for easily crystallizing liquid samples

Abstract

This utility model belongs to the field of analytical chemistry and detection technology, and discloses a pretreatment sampling system for easily crystallizing liquid samples. The sample pipeline is sequentially equipped with an isolation valve, a sampling flange, a first ball valve, a second ball valve, a flow meter, a single-channel sample flow cell, and a measuring instrument. An electric heating tape completely covers the pipeline from the sampling point to the inlet of the measuring instrument, maintaining the temperature at 40±2℃; the system flow rate is constantly controlled at 700±50 L / h. By combining the electric heating tape and the flow meter, crystal formation within the sample pipeline is reduced, improving sampling efficiency.

Description

Technical Field

[0001] This utility model relates to a pretreatment and sampling system for easily crystallizing liquid samples, belonging to the field of analytical chemistry and detection technology. Background Technology

[0002] In the chemical industry, the compositional analysis and quality control of various liquids are crucial. Liquids prone to crystallization are widely present in chemical production processes, such as certain chemical solutions and reaction products. When sampled, they easily crystallize inside pipelines and instruments. Crystallization can alter optical paths or electrodes, leading to decreased measurement accuracy, equipment blockage, and safety risks. Accurate sampling and analysis of these liquids play an irreplaceable role in ensuring the stability of production processes, product quality, and safety; therefore, safety issues are of paramount importance.

[0003] Currently, traditional flow-through cells have complex structures, and liquids prone to crystallization can crystallize and clog pipes and equipment during sampling. This not only affects the accuracy and continuity of sampling but may also damage equipment and increase maintenance costs. Furthermore, the lack of real-time monitoring methods for crystallization makes it impossible to monitor the crystallization status in real time, thus impacting sampling efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a sampling system for pretreatment of easily crystallizing liquid samples, which reduces the formation of crystals in the sample pipeline and improves sampling efficiency by combining electric heating tape and flow meter.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is to provide a sampling system for pretreatment of easily crystallizing liquid samples. The sample pipeline is sequentially equipped with an isolation valve, a first ball valve, a second ball valve, a flow meter, a single-channel sample flow cell, and a measuring instrument. The electric heating tape covers the entire pipeline from the sampling point to the inlet of the measuring instrument to maintain the temperature at 40±2℃.

[0006] The system flow rate is kept constant at 700±50L / h.

[0007] According to this utility model, the sample tube is made of transparent PTFE material and has crystallization monitoring scale lines on the outer wall to visually observe the crystallization situation inside the sample tube.

[0008] According to this utility model, the electric tracing tape is further described as a self-regulating tracing tape.

[0009] According to this utility model, the inner surface of the single-channel sample flow cell is smooth.

[0010] Compared with existing technologies, this invention has the following advantages: it is small in size, requires fewer samples, and has a low sample crystallization rate. This improves the stability of instrument detection, reduces the decrease in measurement accuracy caused by crystallization inside the sample channel and instrument, and lowers the instrument's maintenance rate.

[0011] This utility model integrates parameter optimization and structural simplification in its sampling system, enabling visual monitoring of the crystallization state while reducing the crystallization rate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the sample pretreatment and sampling system for easily crystallizing liquids according to this utility model.

[0013] Figure label:

[0014] Isolation valve-1; Sampling flange-2; First ball valve-3; Electric heating tape-4; Second ball valve-5; Flow meter-6; Single-channel sample flow cell-7; Measuring instrument-8; Sample pipeline-9. Detailed Implementation

[0015] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0016] Please see Figure 1 This utility model provides a sampling system for pretreatment of easily crystallizing liquids. The system includes an isolation valve 1, a sampling flange 2, a first ball valve 3, a second ball valve 5, a flow meter 6, a single-channel sample flow cell 7, and a measuring instrument 8, which are sequentially arranged on the sample pipeline 9. The electric heating tape 4 covers the entire sample pipeline 9 from the sampling point to the inlet of the measuring instrument 8, maintaining the temperature at 40±2℃, preferably 40℃. The flow meter 6 keeps the system flow rate constant at 700±50L / h, preferably 700L / h.

[0017] Sample line 9 is made of transparent PTFE material and has crystallization monitoring scale lines on the outer wall, which makes it easy to observe and determine whether crystallization occurs and the amount of crystallization, facilitates timely maintenance, and improves sampling efficiency.

[0018] In this embodiment, the electric heating cable 4 is a self-regulating type. The PID controller maintains a temperature of 40±2℃, and the flow meter 6 provides feedback to adjust the opening and closing degree of the first ball valve 3 and the second ball valve 5, so that the flow rate is stabilized within the range of 700±50L / h.

[0019] In this embodiment, the single-channel sample flow cell 7 is a straight-through cylindrical cavity with a smooth inner wall. Preferably, the polishing Ra is ≤0.2μm to reduce crystal formation.

[0020] When crystals are observed to adhere to pipe 9, close isolation valve 1, raise the heating temperature of electric heating tape 4 to 60°C, and maintain it for 10 minutes to dissolve the crystals and achieve crystal removal.

[0021] The working principle of this utility model is as follows:

[0022] This invention, by adding an electric heating tape 4 and a flow meter 6, and utilizing the parameter combination of the two, maintains the temperature of the entire pipeline at 40±2℃ through the electric heating tape 4, and simultaneously controls the sample flow rate at 700±50L / h, effectively reducing the crystallization rate; compared with the multi-channel flow cell, the straight-through structure of the single-channel sample flow cell 7 reduces the dead zone by 90%; the sample pipeline 9 uses a transparent PTFE graduated tube to realize real-time quantitative monitoring of crystal growth, which facilitates timely cleaning of crystals.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sample pretreatment and sampling system for easily crystallizing liquids, characterized in that, The sample pipeline is sequentially equipped with an isolation valve, a sampling flange, a first ball valve, a second ball valve, a flow meter, a single-channel sample flow cell, and a measuring instrument. The electric heating tape covers the entire pipeline from the sampling point to the inlet of the measuring instrument, maintaining the temperature at 40±2℃. The system flow rate is kept constant at 700±50L / h.

2. The sample pretreatment and sampling system for easily crystallizing liquids as described in claim 1, characterized in that, The sample tubing is made of transparent PTFE material, and the outer wall is equipped with crystallization monitoring scale lines to visually observe the crystallization situation inside the sample tubing.

3. The sample pretreatment and sampling system for easily crystallizing liquids as described in claim 1, characterized in that: The electric tracing cable is a self-regulating type.

4. The sample pretreatment and sampling system for easily crystallizing liquids as described in claim 1, characterized in that: The inner surface of the single-channel sample flow cell is smooth.

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