Device for automatically adding initiator in polymer polyol production process

Abstract

The utility model relates to a device for automatically adding an initiator in the process of producing polymer polyol, and mainly solves the problems that in the prior art, the initiator is added into a mixing kettle through negative pressure of the mixing kettle, a large amount of oxygen enters a mixing system during negative pressure material suction, potential safety hazards exist, and meanwhile, due to the fact that the pipe diameter of a material suction pipeline is large, the production cost is low. And the phenomenon that the initiator cannot be completely absorbed can occur, so that the quality of a product is influenced. According to the technical scheme, the automatic initiator adding device comprises a batching kettle, a diaphragm pump, an initiator feeding kettle pipeline, an initiator feeding pipeline, an initiator packaging barrel, a polyether discharging pipeline, a feeding kettle, a gear pump, a reaction kettle and a basic polyether kettle, and the problems are well solved. The method can be used in the industrial application of polymer polyol.

Description

Technical Field

[0001] This utility model relates to an apparatus for automatically adding an initiator during the production of polymer polyols. Background Technology

[0002] Before production, polymer polyols require the addition of a certain proportion of initiator. The traditional method involves using a vacuum pump to create a negative pressure of -0.06 MPa in the mixing vessel, and then drawing the initiator into the mixing vessel under this negative pressure. This requires frequent vacuuming to maintain the negative pressure in the mixing vessel, resulting in a large workload and low efficiency. Furthermore, a large amount of oxygen enters the mixing, feeding, and reaction systems, posing a safety hazard. Removing this oxygen requires nitrogen purging, increasing production costs. Additionally, the initiator is added to the mixing vessel via a DN25 metal hose, but due to the large diameter of the suction pipe, incomplete initiator removal can occur, leading to deviations in the added amount and abnormal reactions. This can range from affecting product quality to posing serious safety hazards.

[0003] Chinese patent CN118162080A discloses a reaction system and method for reducing the amount of polymer polyol filter residue. The main circulation unit forms a material flow path from the bottom to the top of the reactor between the bottom and top of the reactor through pipelines and pump equipment outside the reactor, but it cannot solve the problem of this utility model. Utility Model Content

[0004] The technical problem to be solved by this utility model is that in the prior art, the initiator is added to the mixing tank by negative pressure. When the material is sucked in under negative pressure, a large amount of oxygen enters the mixing system, which poses a safety hazard. At the same time, due to the large diameter of the suction pipe, the initiator may not be completely sucked in, thus affecting the quality of the product. This utility model provides a new device for automatically adding initiator, which has the advantages of reducing safety hazards, improving work efficiency and product quality.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an automatic initiator addition device, characterized in that it includes: a mixing tank, a diaphragm pump, an initiator feed tank pipeline, an initiator feeding pipeline, an initiator packaging tank, a polyether discharge pipeline, a feeding tank, a gear pump, a reaction tank, and a basic polyether tank; the basic polyether tank is connected to the initiator packaging tank via the polyether discharge pipeline, the outlet of the diaphragm pump is connected to the mixing tank via the initiator feed tank pipeline, the top of the mixing tank is provided with a pipeline to connect the initiator feed tank pipeline, the initiator feeding pipeline, and the polyether discharge pipeline, the bottom of the mixing tank is connected to the top of the feeding tank, and the bottom of the feeding tank is connected to the top of the reaction tank via the gear pump; the connection between the polyether discharge pipeline and the initiator packaging tank is a three-way valve.

[0006] The initiator feed line, initiator feeding line, and polyether discharge line are all equipped with valves.

[0007] The bottom of the mixing tank is equipped with a pump.

[0008] Operating procedures:

[0009] Open the three-way valve to the initiator feed position and simultaneously open the initiator feed vessel pipeline. The diaphragm pump starts working using compressed air to pump the initiator from the initiator packaging barrel into the mixing vessel. After the material in the initiator packaging barrel is emptied, open the three-way valve to the base polyether feed flushing position. At this time, the base polyether fills the initiator feed vessel pipeline, initiator feeding pipeline, and polyether discharge pipeline. After the inlet and outlet pipelines of the diaphragm pump are completely purged, close the diaphragm pump and the three-way valve. The mixed material is pumped into the feeding vessel through the pump at the bottom of the mixing vessel, and then into the reaction vessel through the gear pump.

[0010] This invention provides an automatic initiator addition device. By installing a diaphragm pump in the pipeline, oxygen can be completely prevented from entering the mixing tank, feeding tank, and reaction tank system, which meets the safety industry's feeding standards. It greatly saves the waste of nitrogen generated during nitrogen replacement and also solves the power consumption generated during the use of vacuum pumps. At the same time, it saves a lot of manpower and improves work efficiency. By using basic polyether to clean and replace the entire pipeline, the problem of environmental pollution and product quality degradation caused by initiator residue is avoided, achieving good technical results. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an automatic initiator addition device provided by this utility model.

[0012] Figure 1 In the diagram, 1 is the batching vessel, 2 is the diaphragm pump, 3 is the initiator feed vessel pipeline, 4 is the initiator feeding pipeline, 5 is the initiator packaging barrel, 6 is the polyether discharge pipeline, 7 is the feeding vessel, 8 is the gear pump, 9 is the reaction vessel, and 10 is the basic polyether vessel. Detailed Implementation

[0013] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0014] Example 1

[0015] An automatic initiator addition device, characterized in that it comprises: a mixing tank 1, a diaphragm pump 2, an initiator feed tank pipeline 3, an initiator feeding pipeline 4, an initiator packaging tank 5, a polyether discharge pipeline 6, a feeding tank 7, a gear pump 8, a reaction vessel 9, and a basic polyether tank 10; the basic polyether tank 10 is connected to the initiator packaging tank 5 via the polyether discharge pipeline 6; the outlet of the diaphragm pump 2 is connected to the mixing tank 1 via the initiator feed tank pipeline 3; the top of the mixing tank 1 is provided with a pipeline that connects the initiator feed tank pipeline 3, the initiator feeding pipeline 4, and the polyether discharge pipeline 6; the bottom of the mixing tank 1 is connected to the top of the feeding tank 7; the bottom of the feeding tank 7 is connected to the top of the reaction vessel 9 via the gear pump 8; the connection between the polyether discharge pipeline 6 and the initiator packaging tank 5 is a three-way valve.

[0016] The initiator feed line 3, the initiator feeding line 4, and the polyether discharge line 6 are all equipped with valves.

[0017] The bottom of the mixing tank is equipped with a pump.

[0018] Operating procedures:

[0019] Open the three-way valve to the initiator feed state, and simultaneously open the initiator feed vessel line 3. The diaphragm pump 2 starts working with the power of compressed air, pumping the initiator from the initiator packaging barrel 5 into the mixing vessel 1. After the material in the initiator packaging barrel 5 is completely emptied, open the three-way valve to the base polyether feed flushing state. At this time, the base polyether fills the initiator feed vessel line 3, the initiator feeding line 4, and the polyether discharge line 6. After the inlet and outlet lines of the diaphragm pump 2 are completely purged, close the diaphragm pump 2 and the three-way valve. The mixed material is pumped into the feeding vessel 7 through the pump at the bottom of the mixing vessel 1, and then into the reaction vessel 9 through the gear pump 8.

[0020] This invention provides an automatic initiator addition device. By installing a diaphragm pump in the pipeline, oxygen can be completely prevented from entering the mixing tank, feeding tank, and reaction tank system, meeting the safety industry's feeding standards. It greatly saves the waste of nitrogen generated during nitrogen replacement and also solves the power consumption problem caused by the use of vacuum pumps. Based on the production capacity of two polymer polyol production lines, it can save 18,000 kWh of electricity per year, approximately 12,600 yuan, while also saving a significant amount of manpower and improving work efficiency. By using basic polyether to clean and replace the entire pipeline, it avoids the problems of environmental pollution and product quality degradation caused by initiator residue, achieving good technical results.

Claims

1. A device for automatic addition of an initiator in the production of a polymeric polyol, characterized in that, include: The equipment includes a batching tank (1), a diaphragm pump (2), an initiator feed tank pipeline (3), an initiator feeding pipeline (4), an initiator packaging barrel (5), a polyether discharge pipeline (6), a feeding tank (7), a gear pump (8), a reaction vessel (9), and a basic polyether tank (10). The basic polyether tank (10) is connected to the initiator packaging barrel (5) via the polyether discharge pipeline (6). The outlet of the diaphragm pump (2) is connected to the batching tank (1) via the initiator feed tank pipeline (3). The top of the batching tank (1) is equipped with a pipeline that connects the initiator feed tank pipeline (3), the initiator feeding pipeline (4), and the polyether discharge pipeline (6). The bottom of the batching tank (1) is connected to the top of the feeding tank (7). The bottom of the feeding tank (7) is connected to the top of the reaction vessel (9) via the gear pump (8). The connection between the polyether discharge pipeline (6) and the initiator packaging barrel (5) is a three-way valve.

2. A device for automatic addition of an initiator in the production of a polymeric polyol according to claim 1, characterized in that, The initiator feed line (3), initiator feeding line (4) and polyether discharge line (6) are all equipped with valves.

3. A device for automatic addition of an initiator in the production of a polymeric polyol according to claim 1, characterized in that, The bottom of the batching vessel (1) is equipped with a pump.

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