A multi-channel analytical system for epichlorohydrin

Abstract

The utility model belongs to chemical analysis instrument technical field discloses a kind of for epoxy chloropropane's multi-flow path analysis system, including flow cell, with sample inlet and sample outlet;Sample inlet is connected with main pipeline;Flow path assembly is connected with another end of main pipeline;Flow path assembly includes at least two parallelly arranged flow paths;Corresponding sample inlet is provided on each flow path;Pneumatic valve is installed on each flow path, for quickly switching to corresponding flow path.The utility model passes through the pneumatic valve of multi-flow path quick switching and independent flow cell structure, avoids different sample mixing in instrument interior, and the influence of the previous sample residue to the following sample, greatly improves the accuracy of detection data.

Description

Technical Field

[0001] This utility model relates to the field of chemical analysis instrument technology, specifically to a multi-path analysis system for online detection of liquid samples. Background Technology

[0002] In chemical production processes, such as the production of epichlorohydrin, continuous or intermittent online analysis of samples from multiple flow paths is required to monitor key parameters such as pH, conductivity, and total organic carbon (TOC). Traditional sampling and detection methods are typically single-function, with a single system often only capable of handling the detection of one flow path or one parameter. When multi-parameter or multi-flow path detection is required, sequential analysis or sample mixing is usually employed, which can easily lead to cross-contamination between different samples or reagents, severely affecting the accuracy of the analytical data.

[0003] Furthermore, in similar continuous monitoring scenarios, downtime of monitoring equipment due to maintenance can also lead to data loss, which not only affects work efficiency but also poses risks to environmental supervision and process control.

[0004] Therefore, there is an urgent need for an online analysis system that can avoid cross-contamination, support simultaneous detection of multiple flow paths and parameters, and is easy to maintain. Utility Model Content

[0005] The purpose of this invention is to solve the above problems and provide a multi-path analysis system for epichlorohydrin.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a multi-path analysis system for epichlorohydrin, comprising,

[0007] The flow cell has a sample inlet and a sample outlet; the sample inlet is connected to a main pipeline.

[0008] The flow path assembly is connected to the other end of the main pipeline; the flow path assembly includes at least two flow paths arranged in parallel; each flow path is provided with a corresponding injection port;

[0009] Pneumatic valves are installed on each flow path to quickly switch to the corresponding flow path.

[0010] According to this utility model, it further includes an electric heat tracing unit, which is installed on the main pipeline and flow path assembly to ensure the flowability of the sample flowing through the pipeline and flow path.

[0011] According to this utility model, the flow pool further includes two sets of flow components arranged in parallel and connected manner. The first set of flow components includes a first flow pipe and a second flow pipe arranged in parallel and connected to each other through a first connecting pipe.

[0012] The second set of flow components includes a third flow tube and a fourth flow tube arranged in parallel, which are connected by a second connecting tube.

[0013] According to this utility model, the first flow tube is further provided with a sample inlet A at the bottom for the sample to enter the flow cell, and a port B at the top for connecting a pH electrode; the second flow tube is provided with a port C at the top, into which a conductivity electrode extends; and the fourth flow tube is provided with a port D at the top, which is a vent to ensure that the sample can fully and uniformly fill the entire flow cell.

[0014] According to this invention, port D is further connected to an online sensor of a TOC analyzer.

[0015] According to this utility model, the flow path is further divided into five, namely a first flow path, a second flow path, a third flow path, a fourth flow path and a fifth flow path. Each flow path is provided with a first sample inlet N1, a second sample inlet N2, a third sample inlet N3, a fourth sample inlet N4 and a fifth sample inlet N5, and each branch pipe is equipped with a pneumatic valve for quick switching of flow paths.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention features a system capable of simultaneous multi-parameter detection, enabling comprehensive analysis of multiple components in liquid samples. Its multi-parameter detection capability allows for real-time monitoring of various parameters of the liquid sample during sampling, such as pH, conductivity, and organic carbon, thereby significantly improving detection efficiency and effectively reducing sample volume and testing time.

[0018] This invention, through a pneumatic valve with multi-flow-path rapid switching and an independent flow cell structure, avoids the mixing of different samples inside the instrument and the influence of residues from the previous sample on the next sample, thus greatly improving the accuracy of the detection data.

[0019] The flow cell of this invention allows multiple analyzer probes to simultaneously detect the same sample within the same cell, eliminating time difference errors caused by sequential detection and improving detection efficiency, real-time data, and comparability.

[0020] This invention adopts a quick interface and independent connection design. When any analyzer malfunctions and requires maintenance, it can be isolated and disassembled separately without shutting down the entire analysis system, thus ensuring the continuity of testing work and reducing maintenance costs.

[0021] The electric heating unit of this invention can effectively prevent easily crystallizing, high-viscosity samples such as epichlorohydrin from crystallizing or solidifying in the delivery pipeline and flow cell due to temperature drop, thus ensuring the accuracy of sample measurement. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a multi-path analysis system for epichlorohydrin according to the present invention;

[0023] Figure 2 This is a schematic diagram of the flow cell of this utility model.

[0024] Wherein, 1-first flow path, 2-second flow path, 3-third flow path, 4-fourth flow path, 5-fifth flow path, 6-pneumatic valve, 7-flow cell, 71-first flow tube, 72-second flow tube, 73-first connecting tube, 74-third flow tube, 75-fourth flow tube, 76-second connecting tube, 77-third connecting tube, 8-electric heating unit, A-sample inlet, B-pH port, C-conductivity port, D-vent, F-sample outlet, N1-first sample inlet, N2-second sample inlet, N3-third sample inlet, N4-fourth sample inlet, N5-fifth sample inlet. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1 This application provides a multi-path analysis system for epichlorohydrin. The sample inlet A of the flow cell 7 is connected to five parallel flow paths via a main pipeline: a first flow path 1, a second flow path 2, a third flow path 3, a fourth flow path 4, and a fifth flow path 5. Each flow path is equipped with a first inlet N1, a second inlet N2, a third inlet N3, a fourth inlet N4, and a fifth inlet N5. Each branch pipeline is equipped with a pneumatic valve 6 for rapid flow path switching, ensuring quick switching to the desired flow path. The rapid response of the pneumatic valve 6 ensures no liquid leakage or cross-interference during multi-path switching. The number of flow paths can be increased or decreased as needed, such as three or eight flow paths.

[0027] The pneumatic valve 6 is controlled by an external control unit, switching according to a preset program at set times or as needed to deliver the selected sample downstream. The rapid response of the pneumatic valve ensures a tight seal during switching, preventing liquid leakage.

[0028] In this embodiment, an electric heat tracing unit 8 is also included. The electric heat tracing unit 8 is disposed on the outer periphery of each flow path and the main pipeline. The selected sample flows continuously through the heat tracing pipeline under the heat preservation of the electric heat tracing unit 8 and enters the flow cell 7. This ensures that the sample maintains its fluidity during the flow process and prevents the formation of crystals.

[0029] The electric heating unit 8 uses a temperature sensor and a PID controller to maintain the temperature at a constant value above the crystallization point of epichlorohydrin, ensuring that the sample is always in a liquid state with good fluidity.

[0030] In the embodiments of this application, please refer to Figure 2 The flow cell 7 includes two sets of parallel flow components. The first set of flow components includes a first flow tube 71 and a second flow tube 72 arranged in parallel, connected by a first connecting tube 73. The second set of flow components includes a third flow tube 74 and a fourth flow tube 75 arranged in parallel, connected by a second connecting tube 76. The two flow components are connected by a third connecting tube 77. The sample enters from the first flow tube 71, passes through the first connecting tube 73, the second flow tube 72, and the third connecting tube 77 in sequence, and then flows out from the third flow tube 74.

[0031] Specifically, the sample flows in from the inlet A at the bottom of the first flow tube 71, gradually filling the first flow tube 71, and then flows into the second flow tube 72 after passing through the first connecting tube 73. The second flow tube 72 is connected to the third connecting tube 77 at a lower position. After the sample fills the second flow tube 72 from top to bottom, it flows out from the sample outlet F at the bottom of the third flow tube 74 through the third connecting tube 77.

[0032] The first flow tube 71 has a port B at its top, into which a pH electrode is inserted. The second flow tube 72 has a port C at its top, into which a conductivity electrode is inserted. The fourth flow tube 75 has a port D at its top, which is connected to an online sensor of a TOC analyzer. Port D can also serve as a vent to ensure that the sample can fully and uniformly fill the entire flow cell.

[0033] Because the probes of the three instruments contact the same stationary or slowly flowing sample simultaneously, pH, conductivity, and TOC values ​​can be read synchronously and instantly, with highly synchronized data and no cross-contamination.

[0034] When the pH analyzer needs calibration, the operator can close the separate inlet valve for that line, which can be set at the front of the probe, and loosen the quick connector to remove the pH electrode for maintenance. The entire process does not affect the continued measurement of conductivity and TOC.

[0035] The advantages of this utility model are:

[0036] Through the aforementioned structural design and process optimization, high efficiency and stability of the detection process are achieved, while protecting the accuracy and continuity of the detection data, making it suitable for long-term operation under complex conditions. This application employs an independent flow path design and modular structure, effectively solving the cross-contamination problem in epichlorohydrin detection and significantly improving detection efficiency and system stability. Furthermore, this design allows for individual maintenance or replacement of the detection instruments, effectively preventing system downtime due to single component failure and ensuring continuous detection. In addition, the application of electric heating technology ensures that the sample maintains fluidity during transport, preventing sample crystallization or precipitation caused by temperature changes, providing strong support for the accuracy of the detection results.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from this utility model, and these improvements and additions should also be considered within the protection scope of this utility model. Any modifications, alterations, and equivalent changes made by those skilled in the art without departing from the spirit and scope of this utility model using the disclosed technical content are equivalent embodiments of this utility model. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of this utility model are still within the scope of the technical solution of this utility model.

Claims

1. A multi-path analysis system for epichlorohydrin, characterized in that, include, The flow cell has a sample inlet and a sample outlet; the sample inlet is connected to a main pipeline. The flow path assembly is connected to the other end of the main pipeline; the flow path assembly includes at least two flow paths arranged in parallel; each flow path is provided with a corresponding injection port; Pneumatic valves are installed on each flow path to quickly switch to the corresponding flow path.

2. The multi-path analysis system for epichlorohydrin as described in claim 1, characterized in that, It also includes an electric heat tracing unit, which is installed on the main pipeline and flow path assembly to ensure the flowability of the sample flowing through the pipeline and flow path.

3. A multi-path analysis system for epichlorohydrin as described in claim 1 or 2, characterized in that, The flow pool includes two sets of parallel and connected flow components. The first set of flow components includes a first flow pipe and a second flow pipe arranged in parallel, and the two are connected by a first connecting pipe. The second set of flow components includes a third flow tube and a fourth flow tube arranged in parallel, which are connected by a second connecting tube.

4. The multi-path analysis system for epichlorohydrin as described in claim 3, characterized in that, The first flow tube has a sample inlet A at the bottom for the sample to enter the flow cell, and a port B at the top for connecting a pH electrode; the second flow tube has a port C at the top, into which a conductivity electrode extends; and the fourth flow tube has a port D at the top, which is a vent to ensure that the sample can fully and uniformly fill the entire flow cell.

5. A multi-path analysis system for epichlorohydrin as described in claim 4, characterized in that, Port D is connected to an online sensor of a TOC analyzer.

6. The multi-path analysis system for epichlorohydrin as described in claim 1, characterized in that, The flow path consists of five channels: the first flow path, the second flow path, the third flow path, the fourth flow path, and the fifth flow path. Each flow path is equipped with a first inlet N1, a second inlet N2, a third inlet N3, a fourth inlet N4, and a fifth inlet N5. Each branch pipe is equipped with a pneumatic valve for quick flow path switching.

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