CN216170101U - Separation and recovery system of methanol solution and alkane oil - Google Patents

Abstract

The utility model discloses a separation and recovery system of methanol solution and alkane oil, which comprises an extraction tank, an oil-water separator, a reflux tank and a collection tank, wherein a stock solution inlet of the extraction tank is connected with a methanol condensate main pipe, an extractant inlet of the extraction tank is connected with a desalted water main pipe, a liquid outlet of the extraction tank is connected with an inlet pipeline of a second flow valve, an outlet of the second flow valve is connected with an inlet pipeline of the reflux tank, an overflow port of the extraction tank is connected with an inlet pipeline of a third flow valve, an outlet of the third flow valve is connected with an inlet pipeline of the oil-water separator, an alkane outlet of the oil-water separator is connected with an inlet pipeline of the collection tank, and a water outlet of the oil-water separator is connected with an inlet pipeline of the reflux tank; the extraction tank is provided with an observation port, the axis of the observation port and the axis of the overflow port are positioned in the same horizontal plane, the observation port is connected with an inlet pipeline of the first stop valve, and the outlet of the first stop valve is connected with a flange viewing mirror flange through a connecting pipe.

Description

Separation and recovery system of methanol solution and alkane oil

Technical field:

The utility model relates to the field of methanol production, in particular to a separation and recovery system of methanol solution and alkane oil.

Background technique:

The crude methanol from the synthesis process is preheated and then enters the pre-rectification tower. The function of the tower is to remove the gas dissolved in the crude methanol, the oxygen-containing organic matter with a boiling point lower than that of methanol, and a small amount of alkane. A condenser is set at the top of the methanol pre-rectification tower. Most of the methanol contained in the top steam is condensed in the first condenser. In the extraction tank, it passes through the mixing area, the separation area and the collection area in sequence. The collection area is equipped with an overflow port. Through extraction, the relative volatility of most of the impurities originally dissolved in the condensate changes. The use of alkane impurities increases with the concentration of methanol. At the same time, most of the saturated hydrocarbon impurities are lifted to the top of the liquid surface, and the methanol-insoluble alkanes in the upper layer are regularly discharged through the overflow port, and the extracted condensate enters the reflux tank from the bottom outlet of the extraction tank. This method can only remove most of the alkane impurities, and a small part of the alkane impurities will be demineralized to form an emulsion, and the layering method cannot accurately control the interface between the alkane oil and the methanol solution, and the methanol solution will be brought to the alkane oil. The product or the paraffin oil is brought back to the tower for re-removal, which affects the product quality, increases the subsequent rectification load, and increases various losses.

Utility model content:

The purpose of this utility model is to provide a separation and recovery system of methanol solution and alkane oil.

The utility model is implemented by the following technical solutions: a separation and recovery system for methanol solution and alkane oil, which includes an extraction tank, an oil-water separator, a reflux tank, and a collection tank. The methanol condensate main pipe is provided with a first flow valve, the extraction agent inlet of the extraction tank is connected to the desalinated water main pipe, the desalted water main pipe is provided with a regulating valve, the liquid outlet of the extraction tank is connected to the second flow rate The inlet line of the valve is connected, the outlet of the second flow valve is connected with the inlet line of the reflux tank, the overflow port of the extraction tank is connected with the inlet line of the third flow valve, and the outlet of the third flow valve is connected is connected with the inlet pipeline of the oil-water separator, the alkane outlet of the oil-water separator is connected with the inlet pipeline of the collection tank, and the water outlet of the oil-water separator is connected with the inlet pipeline of the reflux tank;

The extraction tank is provided with an observation port, the axis of the observation port and the axis of the overflow port are located in the same horizontal plane, and the observation port is connected with the inlet pipeline of the first shut-off valve, the first shut-off valve The outlet is connected with the flange of the flange sight glass through the connecting pipe.

Further, a drainage pipe is also provided on the connecting pipe between the first shut-off valve and the flange sight glass, the drainage pipe is communicated with the interior of the connecting pipe, and the outlet of the drainage pipe is connected to the inner part of the connecting pipe. The inlet of the oil-water separator is fixedly connected, and the drainage pipe is provided with a second shut-off valve.

Further, the diameter of the overflow port is smaller than the diameter of the observation port.

Further, a horizontal reference line is provided on the flange sight glass, and the horizontal reference line and the bottom end of the overflow port are located in the same horizontal plane.

The advantages of the utility model: by adding a flange sight glass, it is more convenient to determine the amount of alkane oil on the liquid surface, the interface between the alkane oil and the methanol solution is more accurately controlled, the separation effect of the alkane oil and the methanol solution is improved, and the amount of the alkane oil and the methanol solution is reduced. The loss of refined methanol increases the yield of refined methanol; an oil-water separator is added after the extraction tank. The oil-water separator separates the methanol solution that may be included in the alkane oil at the overflow, and at the same time utilizes the demulsification ability of the oil-water separator to further separate methanol. The solution is separated from the emulsified alkane impurities; under the cooperation of the extraction tank and the oil-water separator, the technical problems of the interference of the alkane impurities on the rectifying tower caused by the reflux of the alkane impurities and the methanol solution being brought to the alkane oil product are solved, and the subsequent refining is reduced. Distillation load, reduce energy consumption, that is, to achieve further separation and removal of alkane oil and reduce energy consumption; with the cooperation of the drainage pipe and the stop valve, it is convenient to disassemble and clean the flange sight glass.

Description of drawings:

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the structural representation of this utility model;

In the figure: extraction tank 1, raw liquid inlet 11, liquid outlet 12, overflow port 13, second flow valve 14, third flow valve 15, oil-water separator 2, reflux tank 3, collection tank 4, methanol condensate main pipe 5. The first flow valve 51, the horizontal reference line 6, the drainage pipe 7, the second stop valve 71, the connecting pipe 8, the first stop valve 81, the flange sight glass 9, the observation port 10, the liquid level gauge 16, the desalted water Main pipe 17, regulating valve 18.

Detailed ways:

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in Figure 1, the separation and recovery system of methanol solution and alkane oil includes extraction tank 1, oil-water separator 2, reflux tank 3, collection tank 4, and the raw liquid inlet 11 of extraction tank 1 is connected with methanol condensate main pipe 5 , the part of the condensate produced by the cooler at the top of the rectification tower is injected into the extraction tank 1 for extraction and separation; the methanol condensate main pipe 5 is provided with a first flow valve 51, and the extractant inlet of the extraction tank 1 is connected with the desalted water main pipe 17, The desalted water main pipe 17 is provided with a regulating valve 18, and the desalted water extracts the condensed liquid. The inlet pipeline is connected, the methanol solution separated in the extraction tank 1 enters the reflux tank 3 for temporary storage in the pre-column reflux, and the overflow port 13 of the extraction tank 1 is connected with the inlet pipeline of the third flow valve 15. The outlet is connected with the inlet pipeline of the oil-water separator 2, and the alkane oil that overflows from the extraction tank 1, which may contain a small amount of methanol solution, is subjected to secondary separation in the oil-water separator 2, and the alkane outlet of the oil-water separator 2 is connected to the collection tank 4. The inlet pipeline is connected, the water outlet of the oil-water separator 2 is connected with the inlet pipeline of the reflux tank 3, the separated alkane product enters the subsequent alkane processing unit through the collection tank 4, and a small amount of the separated methanol solution enters the reflux tank 3. 3. Carry out the subsequent rectification treatment; the functions of the first flow valve 51, the second flow valve 14, the third flow valve 15, and the regulating valve 18 are to control the liquid level in the extraction tank 1 to be at a constant value. The liquid level gauge 16 is set on the top to control the liquid level height in real time, which is convenient for the adjustment of the first flow valve 51, the second flow valve 14, the third flow valve 15 and the regulating valve 18, and it is convenient to observe the thickness of the oil layer in the extraction tank 1.

The extraction tank 1 is provided with an observation port 10, the axis of the observation port 10 and the axis of the overflow port 13 are located in the same horizontal plane, the diameter of the overflow port 13 is smaller than the diameter of the observation port 10, and the flange sight glass 9 is provided with a horizontal reference Line 6, the horizontal reference line 6 and the bottom end of the overflow port 13 are located in the same horizontal plane, the position of the oil level at the overflow port 13 is determined by the horizontal reference line 6, the thickness of the oil layer is thick and the liquid level of the methanol solution is in the horizontal reference line. When the line 6 is below, the alkane oil can be discharged from the overflow port 13 to reduce the entrainment of methanol solution in the alkane oil, the height of the liquid level is constant, the observation port 10 can completely observe the thickness of the oil surface, and the observation port 10 and the first The inlet of a shut-off valve 81 is connected to the pipeline, the outlet of the first shut-off valve 81 is flanged to the flanged sight glass 9 through the connecting pipe 8 , and the connecting pipe 8 between the first shut-off valve 81 and the flanged sight glass 9 is also provided with There is a drainage pipe 7, the drainage pipe 7 is communicated with the interior of the connecting pipe 8, the outlet of the drainage pipe 7 is fixedly connected with the inlet of the oil-water separator 2, the drainage pipe 7 is provided with a second stop valve 71, and the first stop valve 81 is opened regularly. , the flange sight glass 9 is communicated with the interior of the extraction tank 1 through the connecting pipe 8, the solution inside the extraction tank 1 enters the connecting pipe 8, and the thickness of the oil layer in the connecting pipe 8, that is, the thickness of the oil layer in the extraction tank 1, is observed. Thick, open the third flow valve 15 of the overflow port 13 to discharge the alkane oil, observe the flange sight glass 9, until the oil layer is reduced to a certain thickness, close the third flow valve 15, and close the first stop valve 81 at the same time, Open the second shut-off valve 71 , and discharge the material in the connecting pipe 8 to the oil-water separator 2 through the drainage pipe 7 to reduce the adhesion of the paraffin oil to the flange sight glass 9 .

The specific operation process of this embodiment:

The methanol condensate enters the extraction tank 1 through the methanol condensate main pipe 5 and is extracted with desalinated water. The first flow valve 51 and the regulating valve 18 are used to adjust the inlet flow rates of the two respectively, and the methanol solution separated in the extraction tank 1 enters the reflux tank. Temporarily stored in 3, the outlet flow rate of methanol solution in extraction tank 1 is controlled by the second flow valve 14, so that a stable liquid level value is formed inside, and the first stop valve 81 is opened regularly according to the content of alkane oil in the daily methanol solution. , the flange sight glass 9 is communicated with the interior of the extraction tank 1 through the connecting pipe 8, the solution inside the extraction tank 1 enters the connecting pipe 8, and the thickness of the oil layer in the connecting pipe 8 is observed. Once the oil layer is thick, open the first The three-flow valve 15 discharges the alkane oil, observe the flange sight glass 9 until the oil layer is reduced to a certain thickness, close the third flow valve 15, close the first stop valve 81 at the same time, open the second stop valve 71, and pass the drainage pipe 7. Discharge the material in the connecting pipe 8 to the oil-water separator 2 to reduce the attachment of the alkane oil to the flange sight glass 9; In the secondary separation, the separated alkane product enters the subsequent alkane processing unit through the collection tank 4, and a small amount of the separated methanol solution enters the reflux tank 3, and the subsequent rectification treatment is carried out through the reflux tank 3.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the within the scope of protection of the present invention.

Claims (4)

1. the separation and recovery system of methanol solution and alkane oil, is characterized in that, it comprises extraction tank, oil-water separator, reflux tank, collection tank, the stoste inlet of described extraction tank is connected with methanol condensate main pipe, and described methanol condensation The liquid main pipe is provided with a first flow valve, the extraction agent inlet of the extraction tank is connected to the desalted water main pipe, the desalted water main pipe is provided with a regulating valve, and the liquid outlet of the extraction tank is connected with the inlet of the second flow valve The pipeline is connected, the outlet of the second flow valve is connected with the inlet pipeline of the reflux tank, the overflow port of the extraction tank is connected with the inlet pipeline of the third flow valve, and the outlet of the third flow valve is connected with the inlet pipeline of the third flow valve. The inlet pipeline of the oil-water separator is connected, the alkane outlet of the oil-water separator is connected with the inlet pipeline of the collection tank, and the water outlet of the oil-water separator is connected with the inlet pipeline of the return tank; The extraction tank is provided with an observation port, the axis of the observation port and the axis of the overflow port are located in the same horizontal plane, and the observation port is connected with the inlet pipeline of the first shut-off valve, the first shut-off valve The outlet is connected with the flange of the flange sight glass through the connecting pipe. 2. the separation and recovery system of methanol solution and alkane oil according to claim 1, is characterized in that, the described connecting pipe between described first stop valve and described flange sight glass is also provided with drainage pipe, The drainage pipe is communicated with the interior of the connecting pipe, the outlet of the drainage pipe is fixedly connected with the inlet of the oil-water separator, and the drainage pipe is provided with a second stop valve. 3 . The system for separating and recovering methanol solution and paraffin oil according to claim 1 , wherein the diameter of the overflow port is smaller than the diameter of the observation port. 4 . 4. the separation and recovery system of methanol solution and alkane oil according to claim 3, is characterized in that, described flange sight glass is provided with horizontal reference line, the bottom end of described horizontal reference line and described overflow port in the same horizontal plane.

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