Closed sampling equipment applied to alkylation reaction

Abstract

The utility model provides closed sampling equipment applied to alkylation reaction, which comprises a sampling equipment cylinder body, the sampling equipment cylinder body comprises a sample feeding pipe, the sample feeding pipe extends from the top of the sampling equipment cylinder body to the inner bottom of the sampling equipment cylinder body and is used for feeding materials into the sampling equipment cylinder body; the nitrogen inlet is formed in the top of the sampling equipment barrel and is used for introducing nitrogen into the sampling equipment barrel; the steam inlet is formed in the top of the sampling equipment cylinder body and is used for introducing steam into the sampling equipment cylinder body so as to wash the sampling equipment cylinder body; the heat exchange jacket is arranged on the wall surface of the sampling equipment cylinder and is used for introducing a heat exchange medium to heat a material; the sample discharge hole is formed in the bottom of the sampling equipment barrel and is used for receiving a material sample.

Description

Technical Field

[0001] This application relates to the field of sampling equipment technology, and particularly to a closed sampling device used in alkylation reactions. Background Technology

[0002] In chemical production processes, it is often necessary to sample and analyze liquid raw materials and liquid products. However, the sampling ports of existing sampling devices are mostly exposed, making it easy for unusable samples to remain at the sampling port. Therefore, it is necessary to remove the residual samples at the sampling port before sampling. One sampling method known to the inventors involves placing a container below the sampling port. The residual sample from the previous sampling is first passed into the container before the sampling operation is performed. After the sampling operation is completed, the sample can be poured into a recycling tank or disposed of directly.

[0003] Because liquid materials in alkylation reactions tend to crystallize easily at low temperatures, residual material crystallizing near the sampling port of alkylation reaction sampling devices can easily clog the pipes. This crystallization and blockage of the sampling port pipes affects the efficiency and accuracy of liquid material sampling. Furthermore, existing sampling devices used in alkylation reactions also pose safety risks due to uncontrolled gas emissions and the flammability and explosiveness of samples. Utility Model Content

[0004] This application is made in view of the aforementioned state of the prior art. The purpose of this application is to provide a closed sampling device for use in alkylation reactions, which is suitable for sampling during the alkylation reaction process. The sample outlet of this closed sampling device is not easily blocked, and the sampling process is safe and accident-free.

[0005] This application provides a closed sampling device for alkylation reactions, comprising a sampling device cylinder, the sampling device cylinder including:

[0006] A sample feed tube extends from the top of the sampling device cylinder to the inner bottom of the sampling device cylinder, and is used to feed material into the sampling device cylinder.

[0007] A nitrogen inlet is provided at the top of the sampling device cylinder for introducing nitrogen into the sampling device cylinder.

[0008] A steam inlet is provided at the top of the sampling device cylinder for introducing steam into the sampling device cylinder to rinse the sampling device cylinder.

[0009] A heat exchange jacket is provided on the wall of the sampling device cylinder for introducing a heat exchange medium to heat the material.

[0010] The sample outlet is located at the bottom of the sampling device cylinder for receiving material samples.

[0011] In at least one possible implementation, the sampling device cylinder further includes a vent port for discharging waste gas from the sampling device cylinder.

[0012] The venting port is connected to the exhaust gas collection equipment and / or exhaust gas treatment equipment.

[0013] In at least one possible implementation, the sampling device cylinder further includes a sight glass for observing the material level inside the sampling device cylinder.

[0014] The observation scope is made of acid and alkali resistant tempered glass.

[0015] The observation mirror is equipped with a volume display scale.

[0016] In at least one possible implementation, the heat exchange jacket includes a first jacket interface and a second jacket interface, respectively for introducing or discharging the heat exchange medium.

[0017] In at least one possible implementation, the sampling device cylinder further includes a discharge port for discharging remaining material from the sampling device cylinder.

[0018] The discharge port is located at the bottom of the sampling device cylinder.

[0019] In at least one possible implementation, a discharge valve body is provided upstream of the sample discharge port for controlling the sample discharge operation; and / or

[0020] A discharge port valve body is provided upstream of the discharge interface to control the discharge operation.

[0021] In at least one possible implementation, the sample outlet and the discharge interface share a portion of the pipeline connected to the bottom of the sampling device cylinder.

[0022] In at least one possible implementation, the discharge port is connected to a waste liquid collection device to process the remaining material.

[0023] In at least one possible implementation, elliptical end caps are provided at both the upper and lower ends of the sampling device cylinder.

[0024] In at least one possible implementation, the material of the sampling device cylinder includes at least one of carbon steel, 304 stainless steel, 316L stainless steel, and PTFE-lined steel.

[0025] The closed sampling device for alkylation reactions provided in this application can heat the alkylation reaction materials by setting up a heat exchange jacket. After sampling, the inner wall of the closed sampling device (especially the inner wall of the sample outlet) can be flushed with steam to prevent the alkylation reaction materials from crystallizing at the sample outlet and causing blockage. At the same time, nitrogen gas can be introduced into the closed sampling device before the sampling operation to replace the air (especially oxygen in the air) inside the closed sampling device to avoid safety accidents caused by flammable and explosive alkylation reaction materials. Attached Figure Description

[0026] Figure 1 This is a simplified structural diagram of a closed sampling device according to one embodiment of this application.

[0027] Description of Reference Numerals

[0028] 100 Sampling Equipment Cylinder

[0029] 10 Sample feed tube

[0030] 20 Nitrogen import

[0031] 30 Vent Interface

[0032] 40 Steam Inlet

[0033] 50 heat exchange jacket

[0034] 51 First jacket interface

[0035] 52 Second jacket interface

[0036] 60. Observation Scope

[0037] 70 Sample outlet

[0038] 71. Discharge port valve body

[0039] 80 discharge interface

[0040] 81 Discharge port valve body Detailed Implementation

[0041] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0042] Embodiments of this application provide a closed sampling device (hereinafter, sometimes simply referred to as "sampling device") for use in alkylation reactions, such as... Figure 1As shown, the sampling device may include a sampling device cylinder 100, which may be equipped with a sample feed pipe 10, a nitrogen inlet 20, a venting port 30, a steam inlet 40, a heat exchange jacket 50, a sample outlet 70, and a discharge port 80.

[0043] This sampling equipment is particularly suitable for alkylation reactions, especially for alkylation reaction systems that use aromatic amines such as aniline, m-acetaminoaniline, and 2-amino-4-acetaminoaniline as raw materials.

[0044] Specifically, the main body of the sampling device cylinder 100 can be cylindrical, and its upper and lower ends can be provided with elliptical heads. The elliptical heads can be made of materials with good pressure resistance. Preferably, the material of the sampling device cylinder 100 (especially its elliptical heads) can include at least one of carbon steel, 304 stainless steel, 316L stainless steel (304 and 316L are steel grades), and steel lined with PTFE (the outer layer is steel, and the inner lining is polytetrafluoroethylene).

[0045] The sample feed pipe 10 can be located at the upper part of the sampling device cylinder 100. Preferably, the pipe of the sample feed pipe 10 can extend into the sampling device cylinder 100 from the top, and the pipe of the sample feed pipe 10 can extend to (close to) the inner bottom of the sampling device cylinder 100, so that liquid material can be introduced into the sampling device cylinder 100 from the bottom. It is understood that placing the outlet of the sample feed pipe 10 close to the inner bottom of the device can reduce the impact of liquid material, thereby reducing the generation of static electricity and improving the safety of the sampling operation. At the same time, when the pressure in the alkylation reaction system is high (when the pressure inside the sampling device cylinder 100 is high), the above-mentioned method of extending the sample feed pipe 10 to (close to) the bottom of the sampling device cylinder 100 can also prevent the liquid material from feeding too quickly and prevent material splashing.

[0046] Nitrogen inlet 20 can be located at the top of the sampling equipment cylinder 100 to introduce nitrogen into the cylinder 100 to replace residual air inside the sampling equipment. It is understood that some alkylation reaction materials are flammable and explosive; introducing nitrogen into the sampling equipment to expel oxygen can improve the safety and reliability of the sampling equipment and prevent accidents during the sampling process.

[0047] The vent port 30 can be located at the upper part of the sampling device cylinder 100 to discharge the waste gas generated inside the sampling device. The vent port 30 can be connected to waste gas collection equipment or waste gas treatment equipment, such as a waste gas pipe, to prevent fugitive emissions of waste gas and reduce or avoid environmental pollution. Preferably, the vent port 30 or its upstream and downstream pipes can be equipped with a one-way valve to prevent external gases from entering the sampling device.

[0048] Steam inlet 40 can be located at the upper part of the sampling equipment cylinder 100 to introduce steam into the sampling equipment to flush the inner wall of the sampling equipment cylinder 100, preventing material crystallization at the sampling equipment (especially at the sample outlet 70) and causing blockage of the sampling equipment.

[0049] A heat exchange jacket 50 can be installed on the wall of the sampling device cylinder 100 to heat the liquid material inside the sampling device, preventing or reducing crystallization of the material. The heat exchange jacket 50 can have a first jacket interface 51 and a second jacket interface 52 for introducing or discharging the heat exchange medium into or out of the heat exchange jacket 50. The first jacket interface 51 can be located at the upper part of the heat exchange jacket 50, and the second jacket interface 52 can be located at the lower part of the heat exchange jacket 50. The heat exchange medium can be flexibly selected according to the type of material and reaction conditions. For example, the heat exchange medium can be hot water, steam, etc. It can be understood that when the heat exchange medium is steam, the heat exchange jacket 50 can adopt a "top-in, bottom-out" configuration, that is, steam is introduced into the heat exchange jacket 50 through the first jacket interface 51, and the condensate formed by the steam is discharged through the second jacket interface 52. When the heat exchange medium is hot water, the heat exchange jacket 50 can adopt the form of "bottom inlet and top outlet", that is, hot water is introduced into the heat exchange jacket 50 from the second jacket port 52 and then discharged from the first jacket port 51.

[0050] The sample outlet 70 and discharge port 80 can be located at the bottom of the sampling device cylinder 100, for discharging the material sample and the remaining material inside the sampling device cylinder, respectively. A discharge valve 71 can be installed upstream of the sample outlet 70 to control the sample discharge operation. A discharge valve 81 can be installed upstream of the discharge port 80 to control the discharge operation. Preferably, the sample outlet 70 and discharge port 80 can share a portion of the pipeline connected to the bottom of the sampling device cylinder 100. The discharge port 80 can be connected to a waste liquid collection device for treating the remaining material (which can then be recycled).

[0051] Furthermore, the sampling device cylinder 100 can also be equipped with an observation mirror 60, which can be made of acid and alkali resistant tempered glass and can be equipped with a volume display scale to facilitate observation of the material liquid level inside the sampling device cylinder 100.

[0052] This application also provides a method for operating a closed sampling device applied to an alkylation reaction. The method includes: S1, before sampling, introducing a heat exchange medium into the heat exchange jacket 50 to preheat the material. Opening the nitrogen inlet 20 to introduce nitrogen into the sampling device to displace the air inside. S2, opening the vent port 30 and the sample feed pipe 10, simultaneously introducing material into the sampling device cylinder 100 and venting the waste gas generated inside the cylinder 100. Observing the amount of material added through the sight glass 60, stopping the material introduction when the amount of material added meets the required sample volume. S3, collecting an appropriate amount of test sample through the sample outlet 70. Remaining material in the sampling device can be discharged through the discharge port 80, and the discharged material can be further processed in a waste liquid collection and treatment device. S4, close the vent port 30, open the steam inlet 40 to introduce steam into the sampling equipment to flush the inner wall of the sampling equipment cylinder 100 (especially to flush the sample outlet) to prevent residual material from crystallizing and clogging the sampling equipment.

[0053] The following is a brief description of some of the beneficial effects of the above-described embodiments of this application.

[0054] The closed sampling device for alkylation reactions provided in this application can heat the alkylation reaction sample by setting a heat exchange jacket, and use steam to flush the inner wall of the closed sampling device after sampling, so as to avoid the crystallization of the alkylation reaction material at the sample outlet and cause blockage. At the same time, the closed sampling device can introduce nitrogen into the device before the sampling operation to replace the air (especially oxygen in the air) in the closed sampling device to avoid safety accidents caused by flammable and explosive alkylation reaction materials.

[0055] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0056] It should be understood that the above embodiments are merely exemplary and are not intended to limit this application. Those skilled in the art can make various modifications and changes to the above embodiments under the teachings of this application without departing from the scope of this application.

Claims

1. A closed sampling device for use in alkylation reactions, characterized in that, Includes a sampling device cylinder, the sampling device cylinder comprising: A sample feed tube extends from the top of the sampling device cylinder to the inner bottom of the sampling device cylinder, and is used to feed material into the sampling device cylinder. A nitrogen inlet is provided at the top of the sampling device cylinder for introducing nitrogen into the sampling device cylinder. A steam inlet is provided at the top of the sampling device cylinder for introducing steam into the sampling device cylinder to rinse the sampling device cylinder. A heat exchange jacket is provided on the wall of the sampling device cylinder for introducing a heat exchange medium to heat the material. The sample outlet is located at the bottom of the sampling device cylinder for receiving material samples.

2. The closed sampling device for alkylation reaction according to claim 1, characterized in that, The sampling device cylinder also includes a vent port for discharging waste gas from the sampling device cylinder. The venting port is connected to the exhaust gas collection equipment and / or exhaust gas treatment equipment.

3. The closed sampling device for alkylation reaction according to claim 1, characterized in that, The sampling device cylinder also includes a sight glass for observing the liquid level of the material inside the sampling device cylinder. The observation scope is made of acid and alkali resistant tempered glass. The observation mirror is equipped with a volume display scale.

4. The closed sampling device for alkylation reaction according to claim 1, characterized in that, The heat exchange jacket includes a first jacket interface and a second jacket interface, which are used to introduce or discharge the heat exchange medium, respectively.

5. The closed sampling device for alkylation reaction according to claim 1, characterized in that, The sampling device cylinder also includes a discharge port for discharging any remaining material inside the sampling device cylinder. The discharge port is located at the bottom of the sampling device cylinder.

6. The closed sampling device for alkylation reaction according to claim 5, characterized in that, A discharge valve body is provided upstream of the sample discharge port to control the sample discharge operation; and / or A discharge port valve body is provided upstream of the discharge interface to control the discharge operation.

7. The closed sampling device for alkylation reaction according to claim 5, characterized in that, The sample outlet and the discharge interface share a portion of the pipeline connected to the bottom of the sampling device cylinder.

8. The closed sampling device for alkylation reaction according to claim 5, characterized in that, The discharge port is connected to a waste liquid collection device to process the remaining material.

9. The closed sampling device for alkylation reaction according to claim 1, characterized in that, The upper and lower ends of the sampling device cylinder are provided with elliptical end caps.

10. The closed sampling device for alkylation reaction according to claim 1, characterized in that, The material of the sampling device cylinder includes at least one of carbon steel, 304 stainless steel, 316L stainless steel, and PTFE-lined steel.

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