Purging device of filter press for dimer acid production

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a filter press purging device for dimer acid production, which comprises a buffer tank, the top of the buffer tank is provided with an air inlet, an air outlet and a pressure sensor interface, and the air inlet and the pressure sensor interface are respectively communicated with an air inlet regulating valve and a pressure sensor through pipelines; a demisting grating is arranged on the upper portion of an inner cavity of the buffer tank, a buffer tank feeding port is formed in the side wall of the buffer tank on one side of the lower portion of the demisting grating, a window is arranged on the lower portion of the buffer tank feeding port, and a liquid level meter is arranged on the lower middle portion of the side wall of the buffer tank. A heat preservation coil pipe is arranged at the bottom of an inner cavity of the buffer tank; a buffer tank discharge port in the bottom of the buffer tank is communicated with a transfer pump through a pipeline; the air outlet is sequentially communicated with a centrifugal fan and a feed port of a filter press through pipelines, and a discharge port of the filter press is communicated with a feed port of the buffer tank through a pipeline. The device is simple in structure, convenient to operate, low in energy consumption and capable of improving the product quality.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and in particular relates to a filter press purge device for dimer acid production. Background Art

[0002] Dimer acid mainly refers to the dimer of 18-carbon unsaturated monocarboxylic acid, which has excellent sealing, softness, water resistance and rust resistance, and is widely used in machinery, electronics, daily chemicals, automobiles, coatings and other industries. Dimer acid production uses oleic acid as the main raw material, acidic clay and lithium carbonate as catalysts. After the reaction is completed, the catalyst needs to be filtered and removed, and then the catalyst residue is purged for a long time to blow out the dimer acid adsorbed in the catalyst residue as much as possible to improve the yield of dimer acid; the existing technology generally uses compressed air to purge the catalyst residue, and the air compressor used has high power and high energy consumption. In addition, during the purging process, the dimer acid will oxidize and discolor due to long-term contact with air, which seriously affects the product quality. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a filter press purging device for dimer acid production, which overcomes the defects of the prior art and has the advantages of simple structure, convenient operation, low energy consumption and improved product quality.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A filter press purge device for dimer acid production comprises a buffer tank, wherein an air inlet, an air outlet and a pressure sensor interface are arranged on the top of the buffer tank, and the air inlet and the pressure sensor interface are connected to an air inlet regulating valve and a pressure sensor through pipelines respectively; a demister grid is arranged on the upper part of the inner cavity of the buffer tank (to remove oil mist in circulating nitrogen), a buffer tank feed port is arranged on the side wall of the buffer tank on the lower side of the demister grid, a viewing window is arranged at the lower part of the buffer tank feed port, and a liquid level gauge is arranged at the middle and lower part of the side wall of the buffer tank; an insulation coil is arranged at the bottom of the inner cavity of the buffer tank (to keep the dimer acid warm so that it is in an optimal fluid state), and a buffer tank discharge port at the bottom of the buffer tank is connected to a feed pump through a pipeline; the air outlet is connected to a centrifugal fan and a filter press feed port in sequence through a pipeline, and the filter press discharge port is connected to the buffer tank feed port through a pipeline; the air inlet regulating valve, the pressure sensor, the liquid level gauge, the feed pump and the centrifugal fan are all electrically connected to an automatic control system.

[0006] Preferably, the air intake regulating valve is connected to an external nitrogen supply device through a pipeline.

[0007] Preferably, the liquid level meter is interlocked with the feed pump, and the pressure sensor is interlocked with the air intake regulating valve.

[0008] Preferably, the liquid level meter is connected to the lower part and the middle part of the tank body through flanges. The model of the liquid level meter is L=1500mm, and the manufacturer is Anhui Chunhui Instrument Cable Group Co., Ltd.

[0009] Preferably, the probe of the pressure sensor passes through the top of the buffer tank and extends into the upper part of the inner cavity of the tank. The model of the pressure sensor is -0.1~1.0MPa, and the manufacturer is Shandong Dingnuo Automation Equipment Co., Ltd.

[0010] Preferably, the model of the air intake regulating valve is TQ641H-16P DN32, and the manufacturer is Shandong Haidian Valve Co., Ltd. The model of the centrifugal fan is WSR100A, and the manufacturer is Shandong Zhaner Machinery Co., Ltd. The model of the suction pump is KCB200, and the manufacturer is Jiangsu Jiangda Pump Industry Co., Ltd.

[0011] Preferably, the inlet of the insulation coil is connected to the low-pressure steam supply device through a pipeline and a regulating valve, and the outlet is connected to the condensed water tank through a pipeline; the regulating valve is electrically connected to the automatic control system, thereby realizing the collection and reuse of condensed water.

[0012] Preferably, the automatic control system is a Hollysys DCS automatic control system.

[0013] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0014] The buffer tank of the utility model is filled with nitrogen as circulating purge gas, which is circulated and pumped by a centrifugal fan, and the air intake regulating valve automatically adjusts and replenishes nitrogen according to the pressure in the buffer tank, so that the use of air to oxidize the dimer acid and produce discoloration can be avoided, and the purge gas is recycled to reduce energy consumption; the automatic control of related devices such as the liquid level meter, the material pump, the pressure sensor and the air intake regulating valve can effectively control the pressure and liquid level in the buffer tank according to the parameters set by the program, so as to ensure the smooth progress of production.

[0015] In a word, the utility model has the advantages of simple structure, convenient operation, low energy consumption and improved product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0017] In the figure, 1. buffer tank; 2. air outlet; 3. pressure sensor interface; 4. air inlet regulating valve; 5. pressure sensor; 6. defogger grille; 7. buffer tank feed port; 8. sight glass; 9. liquid level gauge; 10. insulation coil; 11. suction pump; 12. centrifugal fan; 13. filter press feed port; 14. filter press discharge port. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Embodiment 1:

[0020] like Figure 1 As shown, a filter press purge device for dimer acid production includes a buffer tank 1, the top of the buffer tank 1 is provided with an air inlet (not marked), an air outlet 2 and a pressure sensor interface 3, the air inlet and the pressure sensor interface 3 are respectively connected to an air inlet regulating valve 4 and a pressure sensor 5 through pipelines (not marked); a demisting grille 6 is provided at the upper part of the inner cavity of the buffer tank 1, a buffer tank feed port 7 is provided on the side wall of the buffer tank 1 on one side of the lower part of the demisting grille 6, a window 8 is provided at the lower part of the buffer tank feed port 7, and the buffer tank 1 is provided with a pressure sensor interface 3. A liquid level gauge 9 is provided at the lower middle part of the side wall; an insulation coil 10 is provided at the bottom of the inner cavity of the buffer tank 1, and a buffer tank discharge port (not marked) at the bottom of the buffer tank 1 is connected to a suction pump 11 through a pipeline; the air outlet 2 is connected to a centrifugal fan 12 and a filter press feed port 13 in sequence through a pipeline, and the filter press discharge port 14 is connected to the buffer tank feed port 7 through a pipeline; the air intake regulating valve 4, the pressure sensor 5, the liquid level gauge 9, the suction pump 11 and the centrifugal fan 12 are all electrically connected to an automatic control system (not marked).

[0021] In actual production: after the dimer acid mixed with the catalyst obtained in the previous process completely fills the filter press, the gas pipeline of the centrifugal fan 12 in the direction of the filter press is connected to the air inlet set on the feed port 13 of the filter press, and then 0.05MPa of nitrogen is injected into the buffer tank 1 through the air inlet regulating valve 4, the inlet and outlet valves of the centrifugal fan 12 are opened, the centrifugal fan 12 is started, and the discharge of the buffer tank feed port 7 is observed through the window 8. The pressure value of the pressure sensor 5 is set to 0.05MPa. When the pressure value is lower than the set pressure value, the pressure signal detected by the pressure sensor 5 is transmitted to the automatic control system, and the automatic control system sends a command to the air inlet regulating valve 4 to increase its opening degree and replenish the pressure in the buffer tank; when the buffer tank reaches the set value, the automatic control system sends a command to the air inlet regulating valve 4 to close the air inlet regulating valve 4.

[0022] The upper limit of the level gauge 9 is set to 1.4m, and the lower limit is set to 0.1m. As the centrifugal fan 12 continues to operate, the dimer acid in the filter press flows into the buffer tank 1 from the filter press outlet 14. When the liquid level in the buffer tank 1 reaches the upper limit set by the level gauge 9, the level gauge 9 transmits a signal to the automatic control system, and the automatic control system issues a command to the pumping pump 11, and the pumping pump 11 starts to transport the dimer acid in the buffer tank 1 to the workshop storage tank; when the liquid level in the buffer tank 1 reaches the lower limit set by the level gauge 9, the level gauge 9 transmits a signal to the automatic control system, and the automatic control system issues a command to the pumping pump 11, and the pumping pump 11 is turned off.

[0023] Observe the feeding of dimer acid at the feed port 7 of the buffer tank through the window 8 on the buffer tank 1, and continue to purge for 1.5 hours. When it is observed that there is basically no liquid flowing out of the feed port 8, stop the operation of the centrifugal fan 12. All the dimer acid in the filter press is squeezed and purged into the buffer tank 1, and only the catalyst remains in the filter press. After stopping, open the filter press to take out the separated catalyst (the plate and frame filter press has a filter cloth barrier, and the catalyst forms a filter cake between the two filter plates. After the filter plates are loosened, the filter cake falls off by itself).

[0024] Because of the use of automatic control to replenish pressure and pump materials, the labor intensity of operators is reduced compared to manual operation; the use of nitrogen as a circulating purge medium prevents the oxidation and discoloration of dimer acid, and the product quality is also significantly improved; the use of centrifugal fans to circulate and pump nitrogen for purging instead of air compressor purging reduces the motor power by 60%.

[0025] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A filter press purge device for dimer acid production, characterized in that: It comprises a buffer tank, wherein an air inlet, an air outlet and a pressure sensor interface are provided on the top of the buffer tank, and the air inlet and the pressure sensor interface are connected to an air inlet regulating valve and a pressure sensor through pipelines respectively; a defogger grille is provided on the upper part of the inner cavity of the buffer tank, a buffer tank feed port is provided on the side wall of the buffer tank on the lower side of the defogger grille, a viewing window is provided at the lower part of the buffer tank feed port, and a liquid level gauge is provided at the middle and lower part of the side wall of the buffer tank; an insulation coil is provided at the bottom of the inner cavity of the buffer tank, and a buffer tank outlet at the bottom of the buffer tank is connected to a suction pump through a pipeline; the air outlet is connected to a centrifugal fan and a filter press feed port in turn through a pipeline, and the filter press outlet is connected to the buffer tank feed port through a pipeline; the air inlet regulating valve, pressure sensor, liquid level gauge, suction pump and centrifugal fan are all electrically connected to an automatic control system.

2. The filter press purging device for dimer acid production according to claim 1, characterized in that: The air intake regulating valve is connected to an external nitrogen supply device through a pipeline.

3. The filter press purging device for dimer acid production according to claim 1, characterized in that: The liquid level meter is interlocked with the material extraction pump, and the pressure sensor is interlocked with the air intake regulating valve.

4. The filter press purging device for dimer acid production according to claim 1, characterized in that: The liquid level meter is connected to the lower part and the middle part of the tank body through flanges.

5. The filter press purging device for dimer acid production according to claim 1, characterized in that: The probe of the pressure sensor passes through the top of the buffer tank body and extends into the upper part of the tank body cavity.

6. The filter press purging device for dimer acid production according to claim 1, characterized in that: The inlet of the insulation coil is connected to the low-pressure steam supply device through a pipeline and a regulating valve, and the outlet is connected to the condensed water tank through a pipeline.

7. The filter press purging device for dimer acid production according to claim 1, characterized in that: The automatic control system is a Hollysys DCS automatic control system.

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