Device for detecting chloride ions in methanol

Abstract

The utility model provides a device for detecting chloride ions in methanol, which is characterized in that a synthesis gas pipeline is communicated with a washing tower, the tower top of the washing tower is sequentially communicated with a tower top condenser and a return tank through pipelines, the return tank is communicated with the tower top of the washing tower through a pump and a pipeline, and a first detection pipeline is led out of the tower top of the washing tower to form a loop with the washing tower; a first conductivity meter is arranged on the first detection pipeline, a second detection pipeline is arranged on a discharging pipeline leading-out pipeline of the tower top condenser and the return tank, and a second conductivity meter is arranged on the second detection pipeline. According to the utility model, the working performance and effect of the washing tower are judged through the conductivity. And two conductivity detection points are arranged on the tower top backflow piping and the liquid blanking pipeline of the washing tower, so that the detection accuracy is ensured. A section of U-shaped pipe is arranged on the backflow pipeline, the first detection pipeline is communicated with the bent pipe section of the U-shaped pipe, the heat exchanger carries out detection after water vapor separation, the conductivity can be measured after gas-liquid separation, and the detection accuracy is improved.

Description

Technical Field

[0001] This utility model relates to the field of methanol production technology, and in particular to a device for detecting chloride ions in methanol. Background Art

[0002] The removal of water and hydrogen chloride from syngas is crucial. Using water washing increases the amount of sulfuric acid used for sulfuric acid drying, and chloride ions exceeding the control range can corrode downstream equipment. Therefore, syngas needs to be washed, and the washing effect must be effectively monitored. Summary of the Invention

[0003] To address the aforementioned problems, this invention aims to provide a device for detecting chloride ions in methanol, utilizing methanol washing and reflecting the washing effect of the washing tower using a conductivity meter.

[0004] The technical solution of this utility model is as follows:

[0005] An apparatus for detecting chloride ions in methanol includes a syngas pipeline connected to a scrubbing tower, the top of the scrubbing tower being connected in sequence to a top condenser and a reflux tank via pipelines, the reflux tank being connected to the top of the scrubbing tower via a pump and pipelines, a first detection pipeline leading out from the top of the scrubbing tower forming a loop with the scrubbing tower, the first detection pipeline being equipped with a first conductivity meter, and a second detection pipeline being provided on the feed pipelines leading out from the top condenser and reflux tank, the second detection pipeline being equipped with a second conductivity meter.

[0006] Preferably, the first detection pipeline is provided with a U-shaped bend, and a first conductivity meter is provided at the U-shaped bend of the first detection pipeline.

[0007] Preferably, the bottom of the washing tower is connected to the reboiler in the tower bottom via a pipe.

[0008] Preferably, the top condenser and reflux tank are connected to the washed syngas pipeline via a pipeline.

[0009] The advantages of this utility model are:

[0010] 1. The performance and effectiveness of the scrubbing tower can be judged by its conductivity.

[0011] 2. The top reflux piping and liquid feed line of the washing tower are equipped with two conductivity detection points to ensure the accuracy of the detection.

[0012] 3. A U-shaped bend is installed on the reflux pipeline. The first detection pipeline is connected to the bend section of the U-shaped bend. The heat exchanger separates water vapor before detection. This gas-liquid separation before conductivity measurement improves detection accuracy. Syngas and methanol complete the heat and mass transfer process in the tower, and water and hydrogen chloride components are removed by washing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the device for detecting chloride ions in methanol;

[0014] In the diagram: 1. Scrubber; 2. Reboiler at the bottom of the tower; 3. Condenser at the top of the tower; 4. Reflux tank; 5. Pump; 6. First detection line; 7. First conductivity meter; 8. Second detection line; 9. Second conductivity meter; 10. U-bend. DETAILED DESCRIPTION

[0015] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. These embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0016] Example 1

[0017] An apparatus for detecting chloride ions in methanol includes a syngas pipeline connected to a scrubbing tower 1. Chloromethane syngas, comprising chloromethane, dimethyl ether, methanol gas, hydrogen chloride, and water vapor, enters the scrubbing tower 1 through the pipeline. 5 kg of vapor is evaporated to provide heat energy for the reboiler 2 at the bottom of the tower. The top of the scrubbing tower 1 is connected to a top condenser 3 and a reflux tank 4 through a pipeline. Liquid from the reflux tank 4 is pumped back to the top of the scrubbing tower 1 via a pump 5. A first detection pipeline 6 is led out from the top of the scrubbing tower 1 and refluxes back to the scrubbing tower 1. The first detection pipeline is equipped with a first conductivity meter 7. A second detection pipeline 8 is led out from the discharge pipelines of the top condenser 3 and the reflux tank 4. A second conductivity meter 9 is installed on the second detection pipeline 8.

[0018] Preferably, the first detection pipeline 6 is provided with a U-shaped bend 10, and a first conductivity meter 7 is provided at the U-shaped bend of the first detection pipeline.

[0019] Preferably, the bottom of the washing tower 1 is connected to the reboiler 2 in the tower bottom via a pipe.

[0020] Preferably, the top condenser 3 and the reflux tank 4 are connected to the washed syngas (chloromethane synthesis gas), including chloromethane, dimethyl ether, and methanol, via pipelines. After cooling, the syngas enters from the top of the column, and methanol from the reflux tank is pumped to the top for washing. The syngas and methanol complete heat and mass transfer within the column, while washing removes water and hydrogen chloride components. Conductivity meters are installed on the top reflux piping and liquid feed line for conductivity monitoring. The methanol reflux flow rate and top temperature are controlled to ensure the conductivity is below 30 μS / cm.

[0021] This invention compares conductivity with reflux tank sampling analysis, and the data is listed below.

[0022] Table 1

[0023]

[0024] The technical solution of this utility model is explained through the above embodiments, but this utility model is not limited to the above embodiments, that is, it does not mean that this utility model must rely on the above specific embodiments to be implemented. Any improvements made by those skilled in the art based on this utility model, or equivalent substitutions for the materials selected in this utility model, fall within the scope of patent protection.

Claims

1. An apparatus for detecting chloride ions in methanol, characterized in that: The syngas pipeline is connected to the scrubbing tower (1). The top of the scrubbing tower (1) is connected to the top condenser (3) and the reflux tank (4) in sequence through a pipeline. The reflux tank (4) is connected to the top of the scrubbing tower (1) through a pump (5) and a pipeline. The top of the scrubbing tower (1) leads out a first detection pipeline (6) to form a loop with the scrubbing tower (1). The first detection pipeline is equipped with a first conductivity meter (7). The feed pipelines of the top condenser (3) and the reflux tank (4) are equipped with a second detection pipeline (8). The second detection pipeline (8) is equipped with a second conductivity meter (9).

2. The apparatus for detecting chloride ions in methanol according to claim 1, characterized in that: The first detection pipeline (6) is provided with a U-shaped bend (10), and a first conductivity meter (7) is provided at the U-shaped bend of the first detection pipeline.

3. The apparatus for detecting chloride ions in methanol according to claim 1, characterized in that: The bottom of the washing tower (1) is connected to the reboiler (2) in the tower bottom via a pipe.

4. The apparatus for detecting chloride ions in methanol according to claim 1, characterized in that: The top condenser (3) and reflux tank (4) are connected to the washed syngas pipeline via pipelines.

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