Acrylonitrile one-way yield sampling device

Abstract

The utility model provides an acrylonitrile one-way yield sampling device. The acrylonitrile one-way yield sampling device comprises an automatic flow meter, a wet type flow meter and three 1000mL Montella absorption bottles, 400 mL of a 0.5 mol / L hydrochloric acid standard titration solution and 400 mL of water are added into a first absorption bottle of the three absorption bottles, 400 mL of water is added into a second absorption bottle and a third absorption bottle, and the three absorption bottles are sequentially connected according to numbers and placed in a Peltier refrigeration unit; the input end of the automatic flowmeter is connected with an acrylonitrile reaction gas pipeline, the output end of the automatic flowmeter is divided into two paths which are switched by configuring a switching valve, one path is connected with a first absorption bottle through a hose provided with a self-locking quick connector, and the other path is connected with a waste gas recovery pipeline; the input end of the wet-type flowmeter is connected with the third absorption bottle, the output end of the wet-type flowmeter is connected with the tin foil air bag, and the wet-type flowmeter is placed in the heat tracing system; and the automatic flow meter and the wet flow meter are in chain operation.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory sampling instruments, in particular to an acrylonitrile one-way yield sampling device. Background Art

[0002] In the industrial field, the analysis of single-pass yield is mainly used to count the number of products produced by the production device, and then combine it with the input of raw materials to calculate the yield of the device. This data is particularly important for the device and is an important performance data of the reaction condition of the reactor.

[0003] At present, the yield sampling process is as follows: first open the sampling valve for displacement for 5 minutes, connect the absorption bottle with hydrochloric acid standard titration solution to the acrylonitrile reaction gas, adjust the gas flow rate to 20s / L so that the acrylonitrile reaction gas flows through the hydrochloric acid standard titration solution, water, and finally through the wet flow meter, place the absorption bottle in a bucket of water with ice cubes, adjust the level of the wet flow meter so that the bubble is in the middle of the level, adjust the liquid level so that the liquid level contacts the cone tip, and when the sampling volume reaches 30L, immediately close the sampling valve. Before the end of sampling, use a tinfoil air bag to take the absorbed gas sample for analysis.

[0004] Acrylonitrile reaction gas contains highly toxic substance hydrocyanic acid, which will cause harm to human body if it leaks during sampling. In the sampling process, only wet flow meter is used, and the sampling volume is inaccurate. Utility Model Content

[0005] In order to solve the problems existing in the prior art, the embodiment of the present utility model provides an acrylonitrile single-pass yield sampling device, including an automatic flow meter, a wet flow meter, and three 1000mL Monteggia absorption bottles;

[0006] Add 400 mL of 0.5 mol / L hydrochloric acid standard titration solution and 400 mL of water to the first absorption bottle of the three absorption bottles, add 400 mL of water to the second and third absorption bottles, and connect the three absorption bottles in sequence according to their numbers and place them in the Peltier refrigeration unit;

[0007] The input end of the automatic flow meter is connected to the acrylonitrile reaction gas pipeline, and the output end is divided into two paths and switched by configuring a switching valve. One path is connected to the No. 1 absorption bottle through a hose equipped with a self-locking quick connector, and the other path is connected to the exhaust gas recovery pipeline;

[0008] The input end of the wet flow meter is connected to the No. 3 absorption bottle, the output end is connected to the tinfoil air bag, and is placed in the heating system;

[0009] The automatic flow meter operates in interlock with the wet flow meter.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. From a safety perspective, the utility model introduces the displaced acrylonitrile reaction gas into the waste gas recovery system through a switching valve, and isolates the acrylonitrile reaction gas from the laboratory personnel during the sampling process, thus avoiding harm to the human body;

[0012] 2. This utility model uses a combination of automatic flow meter and wet flow meter, and adopts two-point data recording during the sampling process to ensure the accuracy of the sampling volume;

[0013] 3. The utility model is equipped with an automatic flow meter to realize automatic control of the flow rate, so as to achieve a stable flow rate during the sampling process, avoid incomplete absorption and inaccurate data due to excessive or insufficient flow rate, and make the sampling and analysis work convenient and accurate;

[0014] 4. The utility model is equipped with a self-locking quick connector hose to avoid joint detachment and hose aging, making sampling work safer and more stable;

[0015] 5. The utility model is externally connected to a refrigeration unit and a heating system to avoid incomplete absorption caused by temperature increases or decreases due to seasonal changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following describes an embodiment of an acrylonitrile single-pass yield sampling device of the present invention with reference to the accompanying drawings.

[0017] Figure 1 This is the overall structural diagram of the utility model; DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention, they are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0020] In addition, if the descriptions of "first", "second", etc. are involved in this utility model, they are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0021] The following describes the specific implementation of the present invention in detail with reference to specific embodiments:

[0022] See Figure 1 The present invention provides an acrylonitrile single-pass yield sampling device, comprising an automatic flow meter, a wet flow meter, and three 1000 mL Monteggia absorption bottles;

[0023] Add 400 mL of 0.5 mol / L hydrochloric acid standard titration solution and 400 mL of water to the first absorption bottle, and add 400 mL of water to the second and third absorption bottles. Connect the three absorption bottles in sequence according to their numbers and place them in the Peltier refrigeration unit.

[0024] The input end of the automatic flow meter is connected to the acrylonitrile reaction gas pipeline, and the output end is divided into two paths and switched by configuring a switching valve. One path is connected to the No. 1 absorption bottle through a hose equipped with a self-locking quick connector, and the other path is connected to the exhaust gas recovery pipeline;

[0025] The input end of the wet flow meter is connected to the No. 3 absorption bottle, and the output end is connected to the tinfoil air bag, and then placed in the heating system;

[0026] The automatic flow meter operates in interlock with the wet flow meter.

[0027] During actual use, open the sampling valve, first switch the switching valve to connect the acrylonitrile reaction gas pipeline with the waste gas recovery pipeline, replace for 5 minutes, then switch the switching valve to connect the acrylonitrile reaction gas pipeline with the sampling system, so that the acrylonitrile reaction gas flows through the hydrochloric acid standard titration solution, water, and finally flows through the wet flow meter, place the absorption bottle in the Peltier refrigeration unit, turn on the heating system in winter, so that the wet flow meter is placed in a constant temperature environment, adjust the level of the wet flow meter so that the bubble is in the middle of the level, adjust the liquid level so that the liquid level contacts the cone tip, the automatic flow meter and the wet flow meter are interlocked and run, and the flow rate is automatically adjusted to 20s / L. When the sampling volume reaches 30L, the automatic flow meter and the wet flow meter are interlocked and stopped, and the switching valve is switched back to connect the acrylonitrile reaction gas pipeline with the waste gas recovery pipeline. Close the sampling valve. Before the end of sampling, use a tinfoil air bag to take the absorbed gas sample for analysis.

[0028] The embodiments of the present invention have so far described the technical solutions of the present invention in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. An acrylonitrile single-pass yield sampling device, characterized in that: Includes automatic flow meter, wet flow meter, three 1000mL Monteggia absorption flasks; Add 400 mL of 0.5 mol / L hydrochloric acid standard titration solution and 400 mL of water to the first absorption bottle of the three absorption bottles, add 400 mL of water to the second and third absorption bottles, and connect the three absorption bottles in sequence according to their numbers and place them in the Peltier refrigeration unit; The input end of the automatic flow meter is connected to the acrylonitrile reaction gas pipeline, and the output end is divided into two paths and switched by configuring a switching valve. One path is connected to the No. 1 absorption bottle through a hose equipped with a self-locking quick connector, and the other path is connected to the exhaust gas recovery pipeline; The input end of the wet flow meter is connected to the No. 3 absorption bottle, the output end is connected to the tinfoil air bag, and is placed in the heating system; The automatic flow meter operates in interlock with the wet flow meter.

Images