CN212722175U - Reboiling device convenient for sampling - Google Patents

Abstract

The application relates to a reboiling device convenient to sample, its characterized in that includes: (i) a reboiler; (ii) the reboiler is characterized in that a first valve, a visual cup, a stainless steel pipe and a second valve are sequentially arranged outside the bottom of the reboiler; (iii) the inlet of the circulating pump is connected with the stainless steel pipe through an upstream circulating pipeline, and the outlet of the circulating pump is connected with the top of the reboiler through a downstream circulating pipeline; and (iv) a sampling tube protrudingly provided on the downstream circulation line at a position close to a connection port of the circulation line with the top of the reboiler.

Description

Reboiling device convenient for sampling

Technical Field

The present application relates to a reboiling device that facilitates sampling.

Background

Tetrahydrofuran is a common solvent for preparing the grignard reagent, and because the grignard reagent is not sensitive to water, the moisture content of the tetrahydrofuran is strictly controlled, and the moisture content is generally controlled within 0.05%. In the production of tetrahydrofuran, the economic cost is considered to be usually rectified and recycled, and after rectification is finished, sampling is needed before discharging to detect whether the moisture of the tetrahydrofuran reaches the standard or not.

The conventional sampling operation of the reboiler of the rectifying tower is to sample from a valve under a visual cup at the bottom of the reboiler of the rectifying tower, but the bottom of the reboiler is as high as about 3m away from the ground, so that the reboiler needs to climb a staircase to sample, and the operation is inconvenient and potential safety hazards exist; in addition, when the material is discharged from a valve below a viewing cup at the bottom of the reboiler, the material can contact with air in a large area, the temperature of the material in the reboiler of the rectifying tower is up to 70 ℃, and the moisture in the air is easily absorbed by tetrahydrofuran, so that the detection result is greatly influenced; further, need the blowing 3 times before the sample to wash the pipeline between the cauldron bottom and the sample connection, avoid last batch material to remain and influence the detection in the pipeline, complex operation not only like this, 3 times of the material of discharging has caused the waste in order to wash the pipeline moreover.

SUMMERY OF THE UTILITY MODEL

It is an object of the present application to provide a reboiling apparatus that facilitates sampling. The device has an improved sampling system, and can well solve the problems of potential safety hazards caused by inconvenient sampling operation, potential quality hazards caused by influence of factors such as external air or moisture on detection results and material waste.

In particular, the present application relates to:

(1) reboiling apparatus for facilitating sampling, comprising:

(i) a reboiler;

(ii) the reboiler is characterized in that a first valve, a visual cup, a stainless steel pipe and a second valve are sequentially arranged outside the bottom of the reboiler;

(iii) the inlet of the circulating pump is connected with the stainless steel pipe through an upstream circulating pipeline, and the outlet of the circulating pump is connected with the top of the reboiler through a downstream circulating pipeline; and

(iv) and the sampling pipe is arranged on the downstream circulating pipeline in a protruding way and is close to the connecting port of the circulating pipeline and the top of the reboiler.

(2) The reboiling apparatus of (1) above, wherein the sampling tube is a 90 degree arc bend.

(3) The reboiling device described in the above (1) or (2), wherein the length of the vertical part of the sampling tube is 4 to 10cm, preferably about 5 to 8 cm.

(4) The reboiling device as described in any one of (1) to (3) above, wherein the sampling tube has a tube diameter of 1 to 2cm, preferably about 1 cm.

(5) The reboiling apparatus as claimed in any one of (1) to (4) above, wherein the upstream and downstream circulation lines and the sampling pipe are both made of stainless steel.

(6) The reboiling device according to any one of (1) to (5) above, which is used in rectification of tetrahydrofuran.

Drawings

FIG. 1 is a schematic diagram of one of the preferred embodiments of the reboiling apparatus for facilitating sampling according to the present application.

FIG. 2 is a schematic structural view of a preferred embodiment of the sampling tube.

Description of reference numerals:

1: a reboiler;

2: a first valve;

3: a visual cup;

4: a stainless steel tube;

5: a second valve;

6: an upstream circulation line;

7: a circulation pump;

8: a downstream circulation line;

9: a sampling tube;

10: a connecting port of the circulating pipeline and the top of the reboiler;

11: the vertical portion of the sampling tube.

Detailed Description

The structure of the reboiling device of the present application will be described in more detail with reference to the accompanying drawings, but the present application is not limited to the specific embodiment, and any modification and change that do not depart from the gist of the present application fall within the scope of the present application.

As shown in fig. 1, the reboiling apparatus of the present application includes a reboiler 1, a first valve 2, a sight cup 3, a stainless steel pipe 4, a second valve 5, an upstream circulation line 6, a circulation pump 7, a downstream circulation line 8, and a sampling pipe 9.

The reboiler 1 may have a known structure, and is not particularly limited.

The bottom of the reboiler 1 is externally provided with a first valve 2, a visual cup 3, a stainless steel tube 4 and a second valve 5 from top to bottom in sequence.

The reboiler has the sampling system now to be composed of first valve 2, visual cup 3 and second valve 5, implements static sample, namely, opens first valve 2 blowing to visual cup 3, then closes first valve 2, opens second valve 5 and emits the sample in visual cup 3. In such a static sampling method, the composition of the material in the whole reboiler may not be uniform, and the sample discharged from the bottom of the reboiler cannot represent the composition of the whole material, thereby affecting the accuracy of the detection result. In addition, as the pipeline in the industrial production is thick, the amount of the sample put into the visual cup 3 each time at least needs to reach 2kg, so that the observation and the operation are convenient, and the material consumption is high.

One of the main characteristics of the application lies in that a stainless steel pipe 4 is arranged between the visual cup 3 and the second valve 5, a circulating pipeline is led out from the stainless steel pipe 4 and connected with a circulating pump 7, before sampling, the circulating pump 7 is started to make the materials dynamically circulate for a certain time, preferably 10-20 minutes, more preferably 15-20 minutes, and then discharging is carried out, so that the sample obtained by dynamic sampling is more uniform in composition than the sample obtained by the existing static sampling, and the measuring result is more accurate.

The circulating pipeline comprises an upstream section and a downstream section, the upstream section is arranged between the stainless steel pipe 4 and the circulating pump 7, the downstream section is arranged between the circulating pump 7 and a connecting port 10 at the top of the circulating pipeline and the reboiler, and the upstream section and the downstream section are respectively called an upstream circulating pipeline 6 and a downstream circulating pipeline 8. The length ratio of the two stages is not particularly limited, but the upstream stage is generally shorter than the downstream stage in view of the tube resistance.

Another essential feature of the present application is that a sampling tube 9 is provided in the downstream circulation line 8. The sampling tube 9 is placed close to the connection 10 of the circulation line to the top of the reboiler. The reboiler 1 is typically erected at a height, typically about 3 meters from the ground at the bottom, and typically slightly above the platform for human walking operation at the top. Compare with the mode that need the cat ladder to ascend a height just can take a sample in the past, this application through circulating pump 7 with the material pump to reboiler top, the people can stand and take a sample on the platform, has improved sample convenience and security greatly.

As mentioned above, the sampling and detection of tetrahydrofuran requires that the sample be prevented from contacting air and water as much as possible to ensure the accuracy of the result. In the present application, the sampling tube 9 preferably uses a 90 degree arc elbow as shown in FIG. 2. The vertical portion 11 of the sampling tube 9 preferably has a length, preferably a length of 4 to 10cm, more preferably about 5 to 8 cm. The vertical part 11 is extended into the bottom of the sampling bottle during sampling, so that the contact of the sample and air can be better reduced. Further, the sampling tube 9 preferably has a small tube diameter, more preferably the tube diameter is 1-2 cm, and further preferably about 1 cm. Such a small diameter allows the use of a small bore sampling vial, and also helps to reduce the contact of the sample with air in the vial.

The sampling quantity can be reduced to about 10ml by arranging the sampling tube 9, and compared with the prior art that at least 2kg of materials need to be discharged every time when the samples are taken through the visual cup 3, the sampling quantity is greatly reduced, so that the material waste is reduced.

The circulating pump 7 is started immediately after sampling, the material in the reboiler 1 can be circulated to form uniform components after running for 10-20 minutes, preferably about 15-20 minutes, and sampling can be started at the moment. And after sampling, the circulating pump 7 is closed.

Preferably, the upstream circulation line 6, the downstream circulation line 8 and the sampling tube 9 are made of stainless steel.

The reboiling device of the present application is particularly preferably used in the rectification of tetrahydrofuran, but is not limited thereto, and can also be widely used in the rectification of solvents with similar problems.

Industrial applicability

It is an object of the present application to provide a reboiling apparatus that facilitates sampling. The device has the modified sampling system, can solve the inconvenient potential safety hazard that brings of sampling operation, the quality hidden danger and the extravagant problem of material that factors such as outside air or moisture influence the testing result and bring well.

Claims (5)

1. Reboiling apparatus for facilitating sampling, comprising:

a reboiler;

the reboiler is characterized in that a first valve, a visual cup, a stainless steel pipe and a second valve are sequentially arranged outside the bottom of the reboiler;

the inlet of the circulating pump is connected with the stainless steel pipe through an upstream circulating pipeline, and the outlet of the circulating pump is connected with the top of the reboiler through a downstream circulating pipeline; and

and the sampling pipe is arranged on the downstream circulating pipeline in a protruding way and is close to the connecting port of the circulating pipeline and the top of the reboiler.

2. A reboiling apparatus as claimed in claim 1, wherein the sampling tube is a 90 degree arc bend.

3. A reboiling apparatus as claimed in claim 2, wherein the length of the vertical portion of the sampling tube is 4 to 10 cm.

4. A reboiling apparatus as claimed in claim 1 or 2, wherein the sampling tube has a tube diameter of 1 to 2 cm.

5. A reboiling apparatus as claimed in claim 1 or claim 2, wherein the upstream and downstream recycle lines and the sampling tube are made of stainless steel.

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