Emulsion recovery and separation device

Abstract

The utility model relates to an emulsion recycling and separating device and belongs to the field of chemical engineering. Comprising an emulsion observation window, a separation tank and a delivery pump, wherein two ends of the emulsion observation window are connected to the upper part of the wall of the washing tower; the emulsion separation and recovery tank is connected with the washing tower through an external production pipeline, the head end of the external production pipeline is connected to the wall of the washing tower between the two ends of the emulsion observation window, and the tail end of the external production pipeline is connected to the top of the emulsion separation and recovery tank; and the emulsion separation and recovery tank is connected with a delivery pump through a recovery pipeline. Under the condition that the flow of the original device is not changed, the emulsion observation sight glass on the side surface of the top of the washing tower is utilized to check the position of the emulsion, the emulsion is connected to the emulsion recovery and separation tank from the side surface through the delivery pipeline, and the emulsion is discharged regularly, so that the normal operation of the device is prevented from being influenced. The discharged emulsion is separated by standing in the emulsion separation tank or separated by adding an auxiliary agent, the product quality is not influenced, and the emulsion is classified and recycled through a delivery pump.

Description

Technical Field

[0001] This utility model relates to an emulsion recovery and separation device, belonging to the field of chemical engineering. Background Technology

[0002] In the butyl acrylate production process, n-butanol enters the esterification reactor after passing through a dehydration tower. There, it undergoes an esterification reaction with acrylic acid under the action of a catalyst. The water produced in the reaction, along with butanol and butyl acrylate, rapidly escapes from the reactor and enters the dehydration tower, directing the reaction in a direction favorable to product formation. The material containing butyl acrylate obtained from the bottom of the esterification reactor is sent to a catalyst extraction tower. The catalyst and acrylic acid in the butyl acrylate are recovered by extraction with wastewater from the top of the dehydration tower. The raffinate from the top of the extraction tower enters a washing tower, where it is washed with 18% NaOH solution and demineralized water to remove the catalyst, acrylic acid, and other acidic substances from the butyl acrylate.

[0003] The crude ester obtained from the top of the washing tower enters the dealcoholization tower, where light components are removed by negative pressure distillation. The bottom material enters the ester refining tower, where commercial-grade butyl acrylate is obtained from the top through negative pressure distillation. The bottom material is sent to a thin-film evaporator to recover butyl acrylate, and the material containing dimers obtained from the bottom is sent to a dimer decomposer for high-temperature decomposition to further recover butyl acrylate. The material obtained from the bottom of the dimer decomposer is incinerated as heavy components.

[0004] In the washing tower, butyl acrylate is washed with 18% NaOH solution and demineralized water to remove catalyst, acrylic acid and other acidic substances. During this process, due to the reaction of sodium hydroxide and surfactants such as sodium acrylate, an emulsion of butyl acrylate is easily formed between the oily butyl acrylate and the alkaline wastewater.

[0005] This emulsion will not dissolve on its own and will gradually accumulate if not properly controlled. This will not only affect the extraction efficiency and lead to material waste, but may also cause the equipment to malfunction. Moreover, since the equipment is in continuous operation, adding additives to handle it can easily cause product quality issues. Summary of the Invention

[0006] This utility model provides the following technical solution:

[0007] An emulsion recovery and separation device includes an emulsion observation window, a separation tank, and an external pump. The observation window is vertically arranged with both ends connected to the upper part of a scrubbing tower wall. The emulsion separation and recovery tank is connected to the scrubbing tower via an external sampling pipeline. The first end of the external sampling pipeline is connected to the scrubbing tower wall between the two ends of the observation window and is equipped with an external sampling control valve. The second end of the external sampling pipeline is connected to the top of the emulsion separation and recovery tank. An exhaust gas emission pipeline is also provided at the top of the emulsion separation and recovery tank. An observation window is provided on the side of the emulsion separation and recovery tank, and a drain line is provided at the bottom of the side of the tank. The emulsion separation and recovery tank is connected to the external pump via a recovery pipeline, which is equipped with a recovery control valve. The emulsion accumulation is observed through the observation window to determine whether the emulsion needs to be discharged. After reaching the required standard, the emulsion is discharged into the emulsion separation and recovery tank for settling. The recovery value of the emulsion and the effectiveness of chemical dosing during settling are observed through the observation window.

[0008] Preferably, the external pump is a diaphragm pump. Diaphragm pumps are simple, durable, and have low maintenance costs, making them suitable for the long-term intermittent operation of this device.

[0009] Preferably, the external sampling pipeline is a multi-stage external sampling system. The first end of the external sampling pipeline is connected to the wall of the washing tower via two or more external sampling branches, and an external sampling control valve is installed on each external sampling branch. Based on the position of the emulsion layer inside the tower through the emulsion observation window, a suitable external sampling port is selected to sample the emulsion to the emulsion separation and recovery tank. Multi-stage external sampling carries away significantly less material than single external sampling, reducing material waste.

[0010] Preferably, the recovery pipeline is a multi-stage recovery system, with two or more recovery pipelines, each equipped with a recovery control valve. The level of the stratified emulsion is observed through an observation window, and a suitable recovery line is selected for recovery.

[0011] Preferably, the observation window has one or more.

[0012] The beneficial effects of this utility model are:

[0013] This invention, without altering the original equipment process, utilizes a sight glass on the side of the washing tower top to check the emulsion position. A discharge port is added from the side, connected via an external pipeline to the emulsion recovery and separation tank. The emulsion is periodically discharged to avoid affecting the normal operation of the equipment. The discharged emulsion undergoes static separation in the emulsion separation tank, or separation with the addition of additives, without affecting product quality. It is then classified and recovered through multi-stage recovery and an external pump. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the present utility model.

[0015] In the diagram: 1 is the washing tower; 2 is the emulsion observation window; 3 is the external sampling pipeline; 31 is the external sampling branch line; 32 is the external sampling control valve; 4 is the emulsion separation and recovery tank; 41 is the observation window; 42 is the sewage discharge line; 43 is the waste gas emission pipeline; 5 is the recovery pipeline; 51 is the recovery control valve; 6 is the external pump. Detailed Implementation

[0016] Example 1

[0017] An emulsion recovery and separation device includes an emulsion observation window 2, an emulsion separation and recovery tank 4, and an external pump 6. The emulsion observation window 2 is connected to the upper part of the wall of a washing tower 1 at both ends and is arranged vertically. The emulsion separation and recovery tank 4 is connected to the washing tower 1 through an external sampling pipeline 3. The first end of the external sampling pipeline 3 is connected to the wall of the washing tower 1 between the two ends of the emulsion observation window 2 and is equipped with an external sampling control valve 32. The tail end of the external sampling pipeline 3 is connected to the top of the emulsion separation and recovery tank 4. The top of the emulsion separation and recovery tank 4 is also equipped with a waste gas emission pipeline 43. The side of the emulsion separation and recovery tank 4 is equipped with an observation window 41. The bottom side of the emulsion separation and recovery tank 4 is equipped with a sewage discharge line 42. The emulsion separation and recovery tank 4 is connected to the external pump through a recovery pipeline 5, and the recovery pipeline 5 is equipped with a recovery control valve 51.

[0018] The external pump 6 is a diaphragm pump.

[0019] The external acquisition pipeline 3 is a multi-stage external acquisition pipeline. The first end of the external acquisition pipeline 3 is connected to the wall of the washing tower 1 through two or more external acquisition branch lines 31. An external acquisition control valve 32 is provided on the external acquisition branch line 31.

[0020] The recycling pipeline 5 is a multi-stage recycling system, with two or more recycling pipelines 5, and each recycling pipeline 5 is equipped with a recycling control valve 51.

[0021] The observation window 41 has one or more.

[0022] Without altering the original equipment process, the emulsion position is checked using the sight glass 2 on the top side of the washing tower 1. A discharge port is added from the side, connected to the emulsion recovery and separation tank 4 via an external pipeline 3. The emulsion is periodically discharged to avoid affecting the normal operation of the equipment. The discharged emulsion is separated in the emulsion separation tank 4 by settling or by adding additives, without affecting product quality. It is then classified and recovered through multi-stage recovery and external pumps.

Claims

1. An emulsion recovery and separation device, characterized in that, The system includes an emulsion observation window (2), an emulsion separation and recovery tank (4), and an external pump (6). Both ends of the emulsion observation window (2) are connected to the upper part of the washing tower (1) wall, and are arranged vertically. The emulsion separation and recovery tank (4) is connected to the washing tower (1) via an external sampling pipeline (3). The first end of the external sampling pipeline (3) is connected to the washing tower (1) wall between the two ends of the emulsion observation window (2), and is equipped with an external sampling control valve (32). The tail end of the sampling pipeline (3) is connected to the top of the emulsion separation and recovery tank (4); the top of the emulsion separation and recovery tank (4) is also provided with an exhaust gas emission pipeline (43), the side of the emulsion separation and recovery tank (4) is provided with an observation window (41), the bottom of the side of the emulsion separation and recovery tank (4) is provided with a sewage discharge line (42), the emulsion separation and recovery tank (4) is connected to an external pump through a recovery pipeline (5), and a recovery control valve (51) is provided on the recovery pipeline (5).

2. The emulsion recovery and separation device according to claim 1, characterized in that, The external pump (6) is a diaphragm pump.

3. The emulsion recovery and separation device according to claim 1, characterized in that, The external acquisition pipeline (3) is a multi-stage external acquisition pipeline. The first end of the external acquisition pipeline (3) is connected to the wall of the washing tower (1) through two or more external acquisition branch lines (31). An external acquisition control valve (32) is provided on the external acquisition branch line (31).

4. The emulsion recovery and separation device according to claim 1, characterized in that, The recycling pipeline (5) is a multi-stage recycling system. There are two or more recycling pipelines (5), and each recycling pipeline (5) is equipped with a recycling control valve (51).

5. The emulsion recovery and separation device according to claim 1, characterized in that, The observation window (41) has one or more.

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