Filtering device for polyether polyol fine particles

Abstract

According to the technical scheme, the filtering device for the polyether polyol fine particles comprises a neutralization kettle (1), a candle filter (2) and a current day tank (3), outlets of the reaction kettle, the pure water, the phosphoric acid and the adsorbent feeding tank are connected with the top of the neutralization kettle, the neutralization kettle (1) is provided with a bottom discharge valve (1-7) and a material circulating pump (1-8), and a discharge pipeline is connected with the bottom of the candle filter; the candle filter (2) is provided with a control panel (2-6) and is connected with the current day tank (3) through a discharge pipeline, and a filter element valve (2-7) and a filter valve (3-2) are arranged on the discharge pipeline, so that the problem is well solved, and the device can be applied to industrial application of polyether polyol products.

Description

Technical Field

[0001] The utility model relates to a filtering device for fine particles of polyether polyol. Background Art

[0002] Polyether polyol is an organic polymer, which is obtained by polyaddition reaction of initiator (compound containing active hydrogen group) with ethylene oxide (EO), propylene oxide (PO) and the like in the presence of catalyst. Polyether polyol has a series of excellent physical and chemical properties, including good elasticity, wear resistance and chemical resistance, which make polyether polyol widely used in many fields. In the preparation process of polyether polyol produced by using diethylene glycol as initiator, a large number of fine particles will inevitably appear, which will affect the performance of the product. In order to ensure that there are no large number of fine particles in the polyether polyol product, a polyether polyol fine particle filtration device is required.

[0003] The conventional filtering method is to use a plate and frame filter. In order to ensure the filtering speed, filter aids need to be added. Due to the characteristics of the product, the material is easy to solidify at room temperature. After the filtration, it is necessary to use pure water to clean and blow the pipeline, which may easily cause residual moisture in the pipeline and cause the moisture content of the lower kettle to be unqualified. On the other hand, the filter cake formed by the product on the plate and frame is uneven, which may easily cause filter penetration. The filter mesh number of the plate and frame filter is 120 mesh, which is too low. It may easily cause repeated treatment due to unqualified potassium ion indicators and the presence of a large number of fine particles in the refined ether. These problems not only reduce product quality, but also increase the energy consumption of single-kettle production, reduce the output of a single line, and increase the extra workload of employees.

[0004] Chinese patent CN204447475U discloses a liquid pharmaceutical polyethylene glycol filtering device, which includes a filter bag, a tank body, a pressure gauge, a pressure reducing valve, and a quick-opening mechanism; the device is installed on a material pipeline, a filter bag is vertically installed inside the device, the space position in the tank above the filter bag is connected to the material inlet, and the material inlet is led out of the device body, a head is connected to the upper part of the tank body of the device, a pressure gauge and a pressure reducing valve are installed on the head, a discharge port is provided at the lower part of the tank body of the device, and the material outlet is connected to the material pipeline; however, the device is small, not suitable for large-scale industrial production, and has a low production capacity. Utility Model Content

[0005] The technical problem to be solved by the utility model is that, in the prior art, a plate-and-frame filter is used to filter polyether polyols, which will produce a large amount of fine particles, resulting in a decrease in product quality, an increase in energy consumption for single-pot production, a decrease in single-line output and an increase in employee workload. A filtering device for fine particles of polyether polyols is provided, which has the advantages of improving product quality, reducing production energy consumption, increasing single-line output and reducing manual operation load.

[0006] In order to solve the above technical problems, the technical scheme adopted by the utility model is as follows: a filtering device for fine particles of polyether polyols, comprising a neutralization kettle 1, a candle filter 2 and a same-day tank 3; the outlets of the reaction kettle, pure water, phosphoric acid and adsorbent feeding tanks are connected to the top of the neutralization kettle 1, wherein the neutralization kettle 1 is provided with a bottom discharge valve 1-7 and a material circulation pump 1-8, and the discharge pipeline is connected to the bottom of the candle filter 2 through a liquid inlet valve 2-2; the candle filter 2 is provided with a material inlet, a control panel 2-6, a material outlet and a slag discharge port, and is connected to the same-day tank 3 through a discharge pipeline, a filter element valve 2-7 and a filter valve 3-2 are provided on the discharge pipeline at the material outlet, and a slag discharge valve 2-10 is provided on the slag discharge pipeline at the slag discharge port; a nitrogen pipeline 3-3 is provided with a nitrogen purge valve 3-4 and a purge bag valve 3-5 which are connected to the candle filter 2.

[0007] Furthermore, the candle filter 2 is provided with 17 to 20 evenly distributed filter bags 2-3; an overflow pipeline 2-5 and an overflow valve 2-4 are provided at the top of the candle filter 2, and the material fills the entire candle filter 2 before filtering; a material pulling pipeline 3-6 and a material pulling valve 3-7 are provided at the bottom of the candle filter 2, and the remaining small amount of material can be pulled back to the neutralization kettle 1 through the material pulling pipeline 3-6 and the material pulling valve 3-7.

[0008] Furthermore, the mesh size of the filter bag 2-3 is 800 to 1200 meshes.

[0009] The filtering process is as follows:

[0010] 1. Pure water is introduced into the neutralization kettle through the pure water valve. After the feeding is completed, the crude ether (the main components are diethylene glycol, catalyst and ethylene oxide) in the reaction kettle is received through the neutralization kettle liquid receiving valve. After receiving the liquid transfer, it is stirred for 1 hour. After the stirring is completed, phosphoric acid is introduced through the phosphoric acid valve for neutralization reaction. After the reaction for 1 hour, the vacuum pump is turned on, and the negative pressure is started by adjusting the vacuum regulating valve. At the same time, the adsorbent is poured into the adsorbent feeding tank. The negative pressure puts the adsorbent into the neutralization kettle. After the feeding is completed, it is stirred for 0.5 hour.

[0011] 2. After refining is completed, turn on the material circulation pump, and the control panel starts the liquid inlet program. The material in the neutralization kettle enters the candle filter through the bottom discharge valve and the liquid inlet valve, and the liquid is introduced through the overflow valve. The timing is 3 minutes. After the timing ends, the control panel starts the circulation filtration program, the overflow valve is closed, and the material starts the filtration cycle through the filter element valve and the filter circulation valve. After 10 minutes of timing, the control panel switches to normal filtration.

[0012] 3. Start the normal filtering procedure, close the filter circulation valve, and filter the material through the filter element valve and filter valve to the tank of the day.

[0013] 4. When the filter pressure is lower than 0.2Mpa, the filtration program is over, close the filter element valve and the filter valve, and switch the control panel to the drainage program (purge mode); open the neutralization kettle vent valve, open the nitrogen purge valve, fill the candle filter with 0.2Mpa nitrogen, open the filter valve, first purge the filter line, purge the material to the tank of the day, and when there is not much material in the filter test mirror, open the material pull valve, then purge the material pull pipeline, purge the material to the neutralization kettle, close the material pull valve and filter valve before the end of the purge, and the purge is over.

[0014] 5. Start the drying program, open the purge filter bag valve to fill with nitrogen, purge the filter element valve and the filter circulation valve, purge the filter circulation pipeline and the material in the filter bag back to the neutralization kettle. After the drying program is completed for 10 minutes, unload the filter pressure to 0.01Mpa, and then open the slag discharge bottom valve to discharge the slag.

[0015] The utility model provides a filtering device for fine particles of polyether polyols. Crude ether is pumped into a neutralization kettle from a reaction kettle, reacts with pure water, phosphoric acid and an adsorbent in the neutralization kettle, a discharge pipeline of the neutralization kettle is connected to the bottom of a candle filter, and the polyether polyols are filtered and discharged in the candle filter. Since the mesh number of the filter bag in the candle filter is finer, the particles in the material are fully filtered out, and after the filtering is completed, the device is pumped into a tank for the day through a discharge pipeline, thereby improving product quality, reducing production energy consumption of a single kettle, reducing production time, increasing the output of a single line, reducing the workload of employees, and achieving better technical results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of the structure of a filtering device for fine particles of polyether polyol provided by the utility model.

[0017] Attached Figure 1 In the figure, 1 is the neutralization kettle, 1-2 is the neutralization kettle receiving valve, 1-3 is the pure water valve, 1-4 is the phosphoric acid valve, 1-5 is the adsorbent feeding tank, 1-6 is the air defense valve, 1-7 is the bottom discharge valve, 1-8 is the material circulation pump, 1-9 is the vacuum regulating valve, and 1-10 is the vacuum pump; 2 is the candle filter, 2-2 is the liquid inlet valve, 2-3 is the filter bag, 2-4 is the overflow valve, 2-5 is the overflow pipeline, 2-6 is the control panel, 2-7 is the filter element valve, 2-8 is the filter circulation valve, 2-9 is the filter circulation pipeline, and 2-10 is the slag discharge valve; 3 is the same-day tank, 3-2 is the filter valve, 3-3 is the nitrogen pipeline, 3-4 is the nitrogen purge valve, 3-5 is the purge bag valve, 3-6 is the material pulling pipeline, 3-7 is the material pulling valve, and 3-8 is the filter pipeline. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Example 1

[0020] The invention discloses a filtering device for fine particles of polyether polyol, comprising a neutralization kettle 1, a candle filter 2 and a same-day tank 3; the outlets of a reaction kettle, a pure water, a phosphoric acid and an adsorbent feeding tank are connected to the top of the neutralization kettle 1, wherein the neutralization kettle 1 is provided with a bottom discharge valve 1-7 and a material circulation pump 1-8, and the discharge pipeline is connected to the bottom of the candle filter 2 through a liquid inlet valve 2-2; the candle filter 2 is provided with a material inlet, a control panel 2-6, a material outlet and a slag discharge port, and is connected to the same-day tank 3 through a discharge pipeline, a filter element valve 2-7 and a filter valve 3-2 are provided on the discharge pipeline at the material outlet, and a slag discharge valve 2-10 is provided on the slag discharge pipeline at the slag discharge port; a nitrogen pipeline 3-3 is provided with a nitrogen purge valve 3-4 and a purge bag valve 3-5 which are communicated with the candle filter 2.

[0021] The filtering process is as follows:

[0022] The neutralization kettle is fed with pure water through the pure water valve. After the feeding is completed, the crude ether (the main components are diethylene glycol, catalyst and ethylene oxide) in the reactor is received through the liquid receiving valve of the neutralization kettle. After receiving the transfer, it is stirred for 1 hour. Then phosphoric acid is introduced through the phosphoric acid valve for neutralization reaction. After the reaction for 1 hour, the vacuum pump is turned on, and the negative pressure is started by adjusting the vacuum regulating valve. The negative pressure puts the adsorbent in the adsorbent feeding tank into the neutralization kettle. After stirring for 0.5 hours, the material circulation pump is turned on, and the liquid feeding program is started. The neutralization kettle material enters the candle filter. After 3 minutes of liquid feeding, the control panel starts the circulation filtration program, and the material starts to filter. After 10 minutes, the control panel switches to normal filtration, starts the normal filtration program, and filters to the tank of the day; when the filter pressure is lower than 0.2Mpa After the filtration process is over, close the filter element valve and filter valve, switch the control panel to the drainage process, open the neutralization kettle vent valve, open the nitrogen purge valve, fill the candle filter with 0.2Mpa nitrogen, open the filter valve, first purge the filter pipeline, purge the material to the tank of the day, and when there is not much material in the filter test mirror, open the material pull valve, then purge the material pull pipeline, purge the material to the neutralization kettle, close the material pull valve and filter valve before the purge ends, and the purge ends; start the drying process, open the purge filter bag valve to fill nitrogen, purge the filter element valve and filter circulation valve, purge the filter circulation pipeline and the material in the filter bag back to the neutralization kettle, and after the drying process ends with a timing of 10 minutes, unload the filter pressure to 0.01Mpa, and open the slag discharge bottom valve to discharge the slag. The filtration time is reduced from 34h to 22h, saving 12h of filtration time and greatly improving production capacity.

[0023] The utility model provides a filtering device for fine particles of polyether polyols. Crude ether is pumped into a neutralization kettle from a reaction kettle, reacts with pure water, phosphoric acid and an adsorbent in the neutralization kettle, a discharge pipeline of the neutralization kettle is connected to the bottom of a candle filter, and the polyether polyols are filtered and discharged in the candle filter. Since the mesh number of the filter bag in the candle filter is finer, the particles in the material are fully filtered out, and after the filtering is completed, the device is pumped into a tank for the day through a discharge pipeline, thereby improving product quality, reducing production energy consumption of a single kettle, reducing production time, increasing the output of a single line, reducing the workload of employees, and achieving better technical results.

Claims

1. A filtering device for fine particles of polyether polyol, characterized in that: The invention comprises a neutralization kettle (1), a candle filter (2) and a same-day tank (3); the outlets of the reaction kettle, pure water, phosphoric acid and adsorbent feeding tank are connected to the top of the neutralization kettle (1), wherein the neutralization kettle (1) is provided with a bottom discharge valve (1-7) and a material circulation pump (1-8), and the discharge pipeline is connected to the bottom of the candle filter (2) through a liquid inlet valve (2-2); the candle filter (2) is provided with a material inlet, a control panel (2-6), a material outlet and a slag discharge port, and is connected to the same-day tank (3) through a discharge pipeline, the discharge pipeline at the material outlet is provided with a filter element valve (2-7) and a filter valve (3-2), and the slag discharge pipeline at the slag discharge port is provided with a slag discharge valve (2-10); the nitrogen pipeline (3-3) is provided with a nitrogen purge valve (3-4) and a purge bag valve (3-5) and is communicated with the candle filter (2).

2. The filtering device for polyether polyol fine particles according to claim 1, characterized in that: The candle filter (2) is provided with 17 to 20 evenly distributed filter bags (2-3); an overflow pipeline (2-5) and an overflow valve (2-4) are provided at the top of the candle filter (2), and the material is first filled in the entire candle filter (2) before filtering; a material pulling pipeline (3-6) and a material pulling valve (3-7) are provided at the bottom of the candle filter (2), and the remaining small amount of material can be pulled back to the neutralization kettle (1) through the material pulling pipeline (3-6) and the material pulling valve (3-7).

3. The filtering device for polyether polyol fine particles according to claim 2, characterized in that: The mesh number of the filter bag (2-3) is 800 to 1200 meshes.

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