Online continuous analysis system for trace water in methyl formate

Abstract

The utility model relates to the technical field of water content detection, in particular to an online continuous analysis system for trace water in methyl formate. The device comprises a gas-liquid separator, the gas-liquid separator is connected with a methyl formate production device through a pipeline, an inlet pneumatic valve, a three-way ball valve, an online analyzer and an emergency cut-off valve are sequentially arranged on the pipeline between the methyl formate production device and the gas-liquid separator, and a temperature sensor is arranged at the inlet end of the three-way ball valve. A built-in filter element is arranged at the outlet end of the three-way ball valve, and the three-way ball valve is externally coated with an electric heat tracing device. The device is reasonable in structural design, simple and convenient to operate, time-saving and labor-saving, integrates collection, conveying, detection and analysis, can detect raw material sample gas regularly, avoids volatilization of the raw material sample gas, ensures the accuracy of analyzed data, provides real-time data guarantee for exploration of process indexes, and solves the problems in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of water content detection, in particular to an online continuous analysis system for trace water in methyl formate. Background Art

[0002] Methyl formate is an ester organic compound, a colorless, fragrant, volatile liquid. It is a common chemical. It has a low boiling point, is volatile, and contains trace amounts of water. It is widely used in many organic chemical reactions. The water content has an important influence on the purity of methyl formate. Therefore, it is necessary to sample and analyze methyl formate in a timely manner during the reaction of methyl formate.

[0003] At present, the traditional sampling method for methyl formate is manual open sampling, and the sampled methyl formate is transported to the laboratory for analysis. However, methyl formate is often prone to volatilization during the sampling process, which leads to inaccurate analysis results. Therefore, the analysis results obtained by regular manual sampling are not only greatly different from the actual data, but also time-consuming and labor-intensive. Obviously, the traditional sampling and analysis method can no longer meet the requirements and cannot provide real-time data guarantee for the exploration of process indicators. Utility Model Content

[0004] The utility model provides an online continuous analysis system for trace water in methyl formate to make up for the deficiencies of the prior art. The system has reasonable structural design, simple operation, time-saving and labor-saving, and integrates collection, transportation, detection and analysis. The system can detect the raw material sample gas regularly to avoid its volatilization, ensure the accuracy of the analyzed data, provide real-time data guarantee for the exploration of process indicators, and solve the problems existing in the prior art.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] An online continuous analysis system for trace water in methyl formate comprises a gas-liquid separator, which is connected to a methyl formate production device via a pipeline; an inlet pneumatic valve, a three-way ball valve, an online analyzer and an emergency shut-off valve are sequentially arranged on the pipeline between the methyl formate production device and the gas-liquid separator; a temperature sensor is arranged at the inlet end of the three-way ball valve; a built-in filter element is arranged at the outlet end of the three-way ball valve; the three-way ball valve is covered with electric heating; a peristaltic pump and a first check valve are sequentially arranged on the pipeline at the discharge port of the gas-liquid separator; an air pump, a float flowmeter and a second check valve are sequentially arranged on the pipeline at the exhaust port on the top of the gas-liquid separator; the pipeline at the end of the first check valve and the pipeline at the end of the second check valve are respectively connected to a recovery device; a purge mechanism is connected on the pipeline between the inlet pneumatic valve and the gas-liquid separator; the inlet pneumatic valve, the three-way ball valve, the temperature sensor, the electric heating, the online analyzer, the emergency shut-off valve, the air pump and the peristaltic pump are respectively connected to a controller via wires.

[0007] Optionally, the purge mechanism includes a nitrogen gas supply device, the exhaust port pipeline of the nitrogen gas supply device is connected to the third end of the three-way ball valve, and a nitrogen purge valve is provided on the pipeline; a pipeline connected to a vent pneumatic valve is connected to the pipeline between the emergency shut-off valve and the online analyzer, and the nitrogen purge valve and the vent pneumatic valve are respectively connected to the controller via wires.

[0008] Optionally, a temperature probe is provided on the pipeline between the emergency shut-off valve and the gas-liquid separator, and the temperature probe is connected to the controller via a wire.

[0009] Optionally, the built-in filter element is a micron-grade filter element.

[0010] The utility model adopts the above technical scheme, and has the advantages of reasonable structural design, simple operation, time saving and labor saving, and integration of collection, transportation, detection and analysis. It can detect methyl formate regularly to avoid its volatilization, ensure the accuracy of the analyzed data, and provide real-time data guarantee for the exploration of process indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] In the figure, 1. gas-liquid separator; 2. inlet pneumatic valve; 3. three-way ball valve; 4. online analyzer; 5. emergency shut-off valve; 6. temperature sensor; 7. built-in filter element; 8. electric heating; 9. peristaltic pump; 10. first check valve; 11. vacuum pump; 12. float flowmeter; 13. second check valve; 14. nitrogen purge valve; 15. vent pneumatic valve; 16. temperature probe. DETAILED DESCRIPTION

[0013] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. In the following description, many specific details are described to facilitate a full understanding of the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0014] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0015] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0016] As shown in the figure, in this embodiment, an online continuous analysis system for trace water in methyl formate includes a gas-liquid separator 1, which is connected to a methyl formate production device via a pipeline. An inlet pneumatic valve 2, a three-way ball valve 3, an online analyzer 4 and an emergency shut-off valve 5 are sequentially arranged on the pipeline between the methyl formate production device and the gas-liquid separator 1, a temperature sensor 6 is arranged at the inlet end of the three-way ball valve 3, a built-in filter element 7 is arranged at the outlet end of the three-way ball valve 3, an electric heating 8 is coated on the three-way ball valve 3, and a gas-liquid separator 1 is sequentially arranged on the pipeline at the discharge port of the gas-liquid separator 1. The peristaltic pump 9 and the first check valve 10, the pipeline at the exhaust port position on the top of the gas-liquid separator 1 is provided with an air pump 11, a float flowmeter 12 and a second check valve 13 in sequence, the pipeline at the end of the first check valve 10 and the pipeline at the end of the second check valve 13 are respectively connected to the recovery equipment, and a purge mechanism is provided on the pipeline between the inlet pneumatic valve 2 and the gas-liquid separator 1; the inlet pneumatic valve 2, the three-way ball valve 3, the temperature sensor 6, the electric heating 8, the online analyzer 4, the emergency shut-off valve 5, the air pump 11, and the peristaltic pump 9 are respectively connected to the controller via wires.

[0017] Optionally, the purge mechanism includes a nitrogen gas supply device, the exhaust port pipeline of the nitrogen gas supply device is connected to the third end of the three-way ball valve 3, and a nitrogen purge valve 14 is provided on the pipeline; a pipeline connected to a vent pneumatic valve 15 is connected to the pipeline between the emergency shut-off valve 5 and the online analyzer 4, and the nitrogen purge valve 14 and the vent pneumatic valve 15 are respectively connected to the controller via wires.

[0018] Optionally, a temperature probe 16 is provided on the pipeline between the emergency shut-off valve 5 and the gas-liquid separator 1, and the temperature probe 16 is connected to the controller via a wire. The temperature probe 16 can timely measure and control the temperature of the raw material sample gas in the pipeline. When the temperature is lower than the component condensation temperature, a signal can be transmitted to the controller, thereby closing the inlet pneumatic valve 2 and the emergency shut-off valve 5, thereby stopping the system operation.

[0019] Optionally, the built-in filter element 7 is a micron-grade filter element.

[0020] When the system is running, the controller controls the vacuum pump 11 and the peristaltic pump 9 to open, so that negative pressure is formed in the gas-liquid separator 1, and the raw material sample gas is stably extracted from the methyl formate production device. The raw material sample gas enters the online analyzer 4 through the inlet pneumatic valve 2 and the three-way ball valve 3, and the gas components are detected by the online analyzer 4. The built-in filter element 7 set in the three-way ball valve 3 can filter the raw material sample gas and remove particulate impurities to avoid damaging the online analyzer 4. The function of the electric heating 8 is to prevent the condensable components in the raw material sample gas from condensing and affecting the analysis results of the analyzer. The analyzed raw material sample gas is drawn into the gas-liquid separator 1, and the gas in the gas-liquid separator 1 is extracted outward by the vacuum pump 11, and the float flowmeter 12 can check the flow of the gas, so that the gas is stably extracted outward, and the second check valve 13 ensures the one-way output of the gas. At the same time, the peristaltic pump 9 can stably pump out the liquid in the gas-liquid separator 1, and the first check valve 10 ensures that the liquid is output in a single line. Finally, the gas and liquid are uniformly collected by the recovery equipment.

[0021] When the sampling condition is abnormal and the system needs to be stopped, the controller controls the inlet pneumatic valve 2 and the emergency shut-off valve to close, and at the same time shuts down the vacuum pump 11 and the peristaltic pump 9, and opens the nitrogen purge valve 14 and the vent pneumatic valve 15. The nitrogen supply device fills nitrogen into the pipeline between the three-way ball valve 3 and the emergency shut-off valve 5 through the nitrogen purge valve 14 to prevent the analysis of the raw material sample gas that is easy to condense from stopping in the outside world, and the residual medium of the raw material sample gas condenses and remains in the online analyzer 4, thereby improving the service life of the online analyzer 4. It has a reasonable structural design, simple operation, time-saving and labor-saving, and integrates collection, transportation, detection, and analysis. It can regularly detect the raw material sample gas to avoid its volatilization, ensure the accuracy of the analyzed data, and provide real-time data guarantee for the exploration of process indicators, solving the problems existing in the prior art.

[0022] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention are within the protection scope of the present invention.

[0023] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. An online continuous analysis system for trace water in methyl formate, characterized in that: The invention comprises a gas-liquid separator, which is connected with a methyl formate production device via a pipeline. An inlet pneumatic valve, a three-way ball valve, an online analyzer and an emergency shut-off valve are sequentially arranged on the pipeline between the methyl formate production device and the gas-liquid separator. A temperature sensor is arranged at the inlet end of the three-way ball valve, a built-in filter element is arranged at the outlet end of the three-way ball valve, and an electric heating is coated on the three-way ball valve. A peristaltic pump and a first check valve are sequentially arranged on the pipeline at the discharge port of the gas-liquid separator, an air pump, a float flowmeter and a second check valve are sequentially arranged on the pipeline at the exhaust port on the top of the gas-liquid separator, a pipeline at the end of the first check valve and a pipeline at the end of the second check valve are respectively connected with a recovery device, and a purge mechanism is connected on the pipeline between the inlet pneumatic valve and the gas-liquid separator; the inlet pneumatic valve, the three-way ball valve, the temperature sensor, the electric heating, the online analyzer, the emergency shut-off valve, the air pump and the peristaltic pump are respectively connected with a controller via wires.

2. The online continuous analysis system for trace water in methyl formate according to claim 1, characterized in that The purge mechanism includes a nitrogen gas supply device, and the exhaust diameter pipeline of the nitrogen gas supply device is connected and arranged on the third end of the three-way ball valve, and a nitrogen purge valve is arranged on the pipeline; a pipeline connected to the vent pneumatic valve is connected and arranged on the pipeline between the emergency shut-off valve and the online analyzer, and the nitrogen purge valve and the vent pneumatic valve are respectively connected to the controller via wires.

3. The online continuous analysis system for trace water in methyl formate according to claim 2, characterized in that: A temperature probe is arranged on the pipeline between the emergency shut-off valve and the gas-liquid separator, and the temperature probe is connected to the controller via a wire.

4. The online continuous analysis system for trace water in methyl formate according to claim 2, characterized in that: The built-in filter element is a micron-grade filter element.

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