A safe and environment-friendly discharging and granulating device for an oxidation process of polyethylene wax

Abstract

The application discloses a safe and environment-friendly discharging and granulating device for an oxidation polyethylene wax oxidation process, and relates to the technical field of chemical industry.The device comprises a water tank, a two-fluid nozzle, two groups of inner pipes arranged in the two-fluid nozzle and used for guiding oxidation polyethylene wax melt and water flow, and a dehydration roller, wherein the dehydration roller is a circular roller divided into a positive pressure area and a negative pressure area; the outlet end of the two-fluid nozzle is arranged above the water tank, and the oxidation polyethylene wax particles generated by the two-fluid nozzle are flowed into the water tank with the water flow, are extracted into the negative pressure by a Roots vacuum pump in the negative pressure area, are attached to the surface of the roller, and are dehydrated with the forward movement of the roller.The safe and environment-friendly discharging and granulating method for the oxidation polyethylene wax oxidation process solves the problem of harmful gas generated in the preparation process, realizes the elimination of water-soluble gas by water in the water tank, and realizes the removal of harmful gas by the combination of the subsequent adsorption tower.

Description

Technical Field

[0001] This invention relates to the field of chemical technology, and in particular to a safe and environmentally friendly discharge granulation device and its preparation method for the oxidation process of oxidized polyethylene wax. Background Technology

[0002] Oxidized polyethylene wax is an excellent new type of polar wax. Because the molecular chain of oxidized polyethylene wax contains a certain amount of carbonyl and hydroxyl groups, its compatibility with fillers, pigments, and polar resins is significantly improved. Its wettability and dispersibility in polar systems are superior to polyethylene wax, and it also possesses coupling properties, making oxidized polyethylene wax widely applicable.

[0003] There are various process routes for preparing oxidized polyethylene wax. However, regardless of whether a continuous or intermittent process is used, and whether pure oxygen or oxygen-containing gas is used for oxidation, the process will produce some active, flammable, and even toxic and harmful gases. Even when using pure oxygen for oxidation, the oxygen cannot be completely exhausted, and some low-molecular-weight alkanes that are in a gaseous state at that temperature will also be mixed in with the oxidized melt.

[0004] However, at least the following technical problems have been found in the production and use of oxidized polyethylene wax:

[0005] 1. Oxidized polyethylene is often made into sheet products, which are difficult to mix evenly during use, and the product size consistency is poor;

[0006] 2. Tests have shown that during the oxidation of polyethylene wax, small amounts of acetaldehyde, propylene oxide, butyraldehyde, and butanone are also produced, generating toxic and harmful gases. This poses numerous environmental and safety hazards.

[0007] Therefore, we propose a safe and environmentally friendly method for granulation of oxidized polyethylene wax during the oxidation process. Summary of the Invention

[0008] (a) Technical problems to be solved

[0009] To address the shortcomings of existing technologies, this invention provides a safe and environmentally friendly method for granulation of oxidized polyethylene wax during the oxidation process. The molten oxidized polyethylene wax is sprayed into a water tank through a two-fluid nozzle. Under the impact of high-pressure water flow, the molten oxidized polyethylene wax is broken into tiny fragments. Before solidification, these fragments shrink into spheres, irregular cylinders, or squares without edges due to cohesive forces. Since the density of oxidized polyethylene wax is much lower than that of water, the solidified oxidized polyethylene wax particles can float on the water surface and flow with the water flow to the dewatering drum, thus solving the technical problem of uneven granulation.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A safe and environmentally friendly discharge granulation device for the oxidation process of oxidized polyethylene wax includes:

[0013] A water tank containing water for absorbing exhaust gases; and

[0014] A two-fluid nozzle, internally equipped with two sets of inner tubes, used to introduce molten oxidized polyethylene wax and water respectively, and mix them at the nozzle; and

[0015] The dewatering drum is a counterclockwise rotating drum structure used to collect and dry oxidized polyethylene wax particles. The dewatering drum is divided into a positive pressure zone and a negative pressure zone.

[0016] The outlet end of the two-fluid nozzle is set above the water tank. The oxidized polyethylene wax particles generated by the two-fluid nozzle flow into the water with the water flow. In the negative pressure zone, the Roots vacuum pump draws negative pressure, and the oxidized polyethylene wax particles will adhere to the surface of the drum. As the drum moves forward, they will be dehydrated.

[0017] Preferably, the device further includes an exhaust gas treatment component, which includes a collection plate disposed above the water tank. Two fluid nozzles pass through the middle of the collection plate, and the upper end of the collection plate is connected to a pipeline to discharge exhaust gas. A fluid pump is installed in the pipeline to pressurize and extract the exhaust gas from the collection plate.

[0018] Preferably, the device further includes a water circulation component, including a vacuum pump and a water inlet pipe. The water inlet pipe connects the negative pressure zone of the dehydration drum to the water tank. A vacuum pump is installed in the middle of the water inlet pipe. The water removed from the dehydration drum is extracted by the vacuum pump through the water inlet pipe and transported to the water tank for circulation.

[0019] Preferably, an adsorption tower is installed in the middle of the pipeline, and corresponding bacteria are cultivated in the adsorption tower to digest and decompose the organic matter in these gases. The final decomposition products are water and carbon dioxide, which are discharged as harmless gases.

[0020] Preferably, the positive pressure zone of the dewatering drum is equipped with a blower, and the introduced particles are dried by the positive pressure zone formed by the blower blowing hot air.

[0021] Preferably, the special internal structure design of the two-fluid nozzle atomizing nozzle enables the water and oxidized polyethylene wax melt to be mixed evenly, producing a spray of fine droplet size or coarse droplet size.

[0022] Preferably, a shut-off valve is installed in the middle of the water inlet pipe to control the water flow rate.

[0023] Preferably, a fluid pump is installed on the outside of the water inlet pipe, which is connected to an external water supply device. When the water flow provided by the vacuum pump from the positive pressure zone of the dewatering drum is insufficient, the fluid pump is used to introduce external water flow into the water inlet pipe to supplement the water flow.

[0024] A safe and environmentally friendly granulation method for discharging oxidized polyethylene wax during the oxidation process, the specific steps of which are as follows:

[0025] Step 1: First, the oxidized polyethylene wax melt obtained by oxidizing polyethylene wax is pumped into the nozzle of a two-fluid nozzle through a pipeline. Then, hot water, heated to a temperature similar to that of the oxidized polyethylene wax melt, is pumped into the nozzle under pressure. The water and oxidized polyethylene wax melt mix at the nozzle. The oxidized polyethylene wax melt is then sprayed out in a thin film through a specially designed nozzle. At this time, the high-pressure heated water flow tears and breaks the oxidized polyethylene wax film into numerous tiny fragments at the nozzle. Because the oxidized polyethylene wax melt is impacted by water at a temperature similar to that of the oxidized polyethylene wax melt, the oxidized polyethylene wax fragments do not immediately solidify upon cooling. Instead, under the action of cohesive force, they shrink into spheres, ellipsoids, or polygons without sharp edges. This is all done instantaneously. The hot water mixed with these oxidized polyethylene wax fragments is then directly mixed into the water tank.

[0026] Step 2: Pour water into the tank. Water-soluble gases such as acetaldehyde and butyraldehyde contained in the oxidized polyethylene wax will dissolve in the water. Propylene oxide, butanone, etc. are semi-soluble in water and partially liquefied. A small amount of aldehydes and ketones will exist in gaseous form. Since the two-fluid nozzle is completely wrapped by the material, only the water outlet of the tank is left with a gap. Air flows in through the gap, mixed with organic gases, and enters the adsorption tower through the top pipe. The corresponding bacteria cultivated in the adsorption tower can digest and decompose the organic matter in these gases. The final decomposition products are water and carbon dioxide, which are discharged as harmless gases. The fluid pump can make the entire gas reaction device move in the expected direction.

[0027] Step 3: The oxidized polyethylene wax particles that enter the water tank will float on the surface of the water because their density is less than that of water, and will flow towards the outlet with the water flow. A dewatering roller is installed at the outlet of the water tank.

[0028] Step 4: The dehydrated water is extracted by a vacuum pump for circulation. Then, when the dehydrated granular material adhering to the surface of the drum rotates into the positive pressure zone of the drum, dry hot air is blown into the positive pressure zone of the drum by a blower, which further dries and removes the granular material adhering to the surface, and it enters the collection container.

[0029] Preferably, in step five: pressurize the gas using a fluid pump to extract the waste gas from the collection plate, and install an adsorption tower in the middle of the pipeline. After purification by the adsorption tower, the exhaust gas is discharged.

[0030] (III) Beneficial Effects

[0031] 1. By employing a two-fluid nozzle pumped through a pipeline, hot water, heated to a temperature similar to that of the molten polyethylene oxide (PEO) wax, is pressurized and pumped into the nozzle. The water and PEO wax mix at the nozzle, and the PEO wax melt is ejected as a thin film through a specially designed nozzle. At this point, the high-pressure heated water stream tears and breaks the PEO wax film into numerous tiny fragments. These hot water fragments, mixed with the PEO wax fragments, are directly added to the water tank. Because the PEO wax melt is impacted by water at a temperature similar to the PEO wax melt, the PEO wax fragments do not immediately solidify upon cooling. Instead, under the influence of cohesive forces, they shrink into spheres, ellipsoids, or polygons without sharp edges. Therefore, the problem of poor particle size uniformity in the prepared PEO wax is effectively solved, resulting in uniform particle size of the granules obtained through spray granulation.

[0032] 2. Because the two-fluid nozzle is completely encased in material, with only a gap at the water tank outlet, the exhaust gas treatment component includes a collection plate positioned above the water tank. The two-fluid nozzle passes through the middle of the collection plate, and the exhaust gas is discharged through a pipeline at the top of the collection plate. A fluid pump is installed in the pipeline to pressurize and extract the exhaust gas from the collection plate. An adsorption tower is installed in the middle of the pipeline, where corresponding bacteria are cultured. Therefore, the problem of harmful gases generated during the preparation process is effectively solved. This achieves the removal of harmful gases by combining the elimination of water-soluble gases in the water tank with the subsequent adsorption tower. Attached Figure Description

[0033] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Figure 1 This is a process flow diagram of a safe and environmentally friendly method for granulation of oxidized polyethylene wax according to the present invention.

[0035] Figure 2 This invention provides a particle size distribution table of the product in a safe and environmentally friendly discharge granulation device for the oxidation process of polyethylene wax.

[0036] Legend: 1. Dehydration drum; 2. Vacuum pump; 3. Water tank; 4. Two-fluid nozzle; 5. Water inlet pipe; 6. Adsorption tower; 7. Fluid pump; 8. Shut-off valve; 9. Fluid pump. Detailed Implementation

[0037] This application provides a safe and environmentally friendly discharge granulation device for the oxidation process of polyethylene wax, solving the problem of poor granulation consistency and difficulty in uniform mixing in the prior art. In the preparation process, a two-fluid nozzle is pumped in through a pipeline. Then, hot water with a temperature similar to that of the molten polyethylene wax is pumped into the nozzle under pressure. The water and the molten polyethylene wax are then mixed at the nozzle. This hot water mixed with molten polyethylene wax fragments is directly mixed into a water tank. The molten polyethylene wax is sprayed out in a thin film through a specially designed nozzle, achieving a uniform granulation effect. Afterward, it is automatically dehydrated by a dehydration drum 1.

[0038] Example 1

[0039] The technical solution in this application embodiment is to solve the problem of poor uniformity in the size of the prepared oxidized polyethylene wax particles. The overall idea is as follows:

[0040] like Figure 1 As shown, in view of the problems existing in the prior art, the present invention provides a safe and environmentally friendly discharge granulation device for the oxidation process of polyethylene wax, comprising:

[0041] Water tank 3 contains water for absorbing exhaust gases; and

[0042] A two-fluid nozzle 4, wherein the nozzle 4 has two sets of internal pipes for introducing molten polyethylene oxide and water flow respectively, and mixing them at the nozzle; and

[0043] The main function of the dehydration drum 1 is to collect and dry oxidized polyethylene wax particles. The dehydration drum 1 is divided into a positive pressure zone and a negative pressure zone, and has a counterclockwise rotating drum structure.

[0044] The outlet end of the two-fluid nozzle 4 is set above the water tank 3. The oxidized polyethylene wax particles generated by the two-fluid nozzle 4 flow into the water with the water flow. In the negative pressure zone, the Roots vacuum pump draws negative pressure, and the oxidized polyethylene wax particles will adhere to the surface of the drum. As the drum moves forward, they are dehydrated.

[0045] This patent involves spraying molten oxidized polyethylene wax and water under pressure into a water tank 3 through a two-fluid nozzle 4. The molten oxidized polyethylene wax, sprayed out in a thin film state, breaks into tiny fragments under the impact of the high-pressure water flow. Before it solidifies, these fragments shrink into spheres, irregular cylinders, or squares without edges due to cohesive forces. Since the density of oxidized polyethylene wax is much lower than that of water, the solidified oxidized polyethylene wax particles can float on the water surface and flow with the water flow towards the dewatering roller 1.

[0046] Example 2

[0047] like Figure 1As shown, based on Example 1, this application's embodiments aim to treat the harmful gases generated during the granulation process. The overall approach is as follows:

[0048] The gas extraction assembly further includes an exhaust gas treatment assembly, which comprises a collection plate positioned above the water tank 3. A two-fluid nozzle 4 passes through the center of the collection plate, and exhaust gas is discharged through a pipeline at the upper end of the collection plate. A fluid pump 7 is installed in the pipeline to pressurize and extract the exhaust gas from the collection plate. A [missing information - likely a device or component] is located in the middle of the pipeline.

[0049] The adsorption tower 6 contains cultured bacteria that can digest and decompose the organic matter in these gases, with the final decomposition products being water and carbon dioxide, which are then discharged as harmless gases.

[0050] The water circulation assembly includes a vacuum pump 2 and a water inlet pipe 5. The water inlet pipe 5 connects the negative pressure zone of the dehydration drum 1 to the water tank 3. The vacuum pump 2 is installed in the middle of the water inlet pipe 5. The water dehydrated by the dehydration drum 1 is extracted by the vacuum pump 2 through the water inlet pipe 5 and transported to the water tank 3 for circulation.

[0051] A shut-off valve 8 is installed in the middle of the water inlet pipe 5. The shut-off valve 8 is used to control the water flow rate of the water inlet pipe 5. A fluid pump 9 is installed on the outside of the water inlet pipe 5. The fluid pump 9 is connected to the external water supply equipment. When the water flow rate provided by the vacuum pump 2 from the positive pressure zone of the dehydration drum 1 is insufficient, the fluid pump 9 is used to introduce external water flow into the water inlet pipe 5 to supplement the water flow rate.

[0052] The positive pressure zone of the dehydration drum 1 is equipped with a blower. The positive pressure zone formed by the blower blowing hot air dries the introduced particles. The special internal structure design of the atomizing nozzle of the two-fluid nozzle 4 enables the water and oxidized wax melt to be mixed evenly.

[0053] A safe and environmentally friendly granulation method for discharging oxidized polyethylene wax during the oxidation process, the specific steps of which are as follows:

[0054] Step 1: First, the oxidized polyethylene wax melt obtained by oxidizing polyethylene wax is pumped into the nozzle of the two-fluid nozzle 4 through a pipeline. Then, hot water that is heated to a temperature similar to that of the oxidized polyethylene wax melt is pumped into the nozzle of the two-fluid nozzle 4 under pressure. Then, the water and the oxidized polyethylene wax melt are mixed at the two-fluid nozzle 4. This hot water mixed with oxidized polyethylene wax fragments is directly mixed into the water tank 3.

[0055] Step 2: Water is poured into water tank 3. Water-soluble gases such as acetaldehyde and butyraldehyde contained in the oxidized polyethylene wax will dissolve in the water. Propylene oxide, butanone, etc. are semi-soluble in water and partially liquefied. A small amount of aldehydes and ketones will exist in gaseous form. Since the two-fluid nozzle 4 is completely wrapped by the material, only the water outlet of water tank 3 has a gap. Air flows in from the gap, mixed with organic gases, and enters the adsorption tower 6 through the top pipe. The corresponding bacteria cultivated in the adsorption tower 6 can digest and decompose the organic matter in these gases. The final decomposition products are water and carbon dioxide, which are discharged as harmless gases. The fluid pump 7 can make the entire gas reaction device move in the expected direction.

[0056] Step 3: The oxidized polyethylene wax particles entering the water tank 3 will float on the surface of the water because their density is less than that of water, and will flow towards the outlet with the water flow. A dewatering roller 1 is provided at the outlet of the water tank 3.

[0057] Step 4: The dehydrated water is extracted by vacuum pump 2 for circulation. Then, when the dehydrated and adhering granular material rotates into the positive pressure zone of the drum, the positive pressure zone of the drum is blown in dry hot air by the blower, which further dries and removes the granular material adhering to the surface, and it enters the collection container.

[0058] Step 5: Pressurize the gas using fluid pump 7 to extract the waste gas from the collection plate. An adsorption tower 6 is installed in the middle of the pipeline. After purification by the adsorption tower 6, the exhaust gas is discharged. The molten oxidized polyethylene wax is ejected in a thin film through a specially designed nozzle. At this time, the high-pressure heated water flow tears and breaks the molten oxidized polyethylene wax film into numerous tiny fragments at the two-fluid nozzle 4. Because the molten oxidized polyethylene wax is impacted with water at a temperature similar to that of the molten oxidized polyethylene wax, the fragments do not immediately solidify upon cooling. Instead, under the action of cohesive force, they shrink into spheres, ellipsoids, or polygons without sharp edges. This is all completed instantaneously. Experiments have confirmed that... Figure 2 As shown, the granules obtained by spray granulation have uniform particle size, mostly spherical or ellipsoidal, with a bulk density between 600-700 kg / m3. In one example, the particle size was zero on a 40-mesh sieve and 50% on a 30-mesh sieve, indicating that the particles obtained by this process are uniform in size, mostly between 30 and 40 mesh.

[0059] Obviously, the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A safe and environmentally friendly discharging and granulating device for the oxidation process of polyethylene wax oxidation, characterized in that, Comprising: a water tank (3) for containing water for absorbing exhaust gas; and a two-fluid nozzle (4) provided with two groups of inner tubes inside for guiding the flow of oxidized polyethylene wax melt and water respectively, and mixing at the nozzle; and a dehydration roller (1) for collecting and drying oxidized polyethylene wax particles, wherein the dehydration roller (1) is a circular roller divided into a positive pressure area and a negative pressure area; wherein the outlet end of the two-fluid nozzle (4) is arranged above the water tank (3), and the oxidized polyethylene wax particles generated by the two-fluid nozzle (4) flow into the water tank (3) with the water flow, and the oxidized polyethylene wax particles are attached to the surface of the roller under the negative pressure generated by the Roots vacuum pump in the negative pressure area, and then the roller moves forward and dehydrates; The device further comprises a water flow circulation assembly, which comprises a vacuum pump (2) and a water inlet pipe (5), wherein the water inlet pipe (5) is connected to the negative pressure area of the dehydration roller (1) and the water tank (3), and the vacuum pump (2) is arranged in the middle of the water inlet pipe (5); The positive pressure area of the dehydration roller (1) is provided with a blower.

2. A safe and environmentally friendly discharging and granulating device for the oxidation process of polyethylene wax oxidation as claimed in claim 1, characterized in that: The device further comprises a tail gas treatment assembly, which comprises a collection plate arranged above the water tank (3), wherein the two-fluid nozzle (4) penetrates the middle of the collection plate, and the exhaust gas is discharged through a pipeline arranged at the upper end of the collection plate, and a fluid pump (7) is arranged in the pipeline.

3. A safe and environmentally friendly discharging and granulating device for the oxidation process of polyethylene wax oxidation as claimed in claim 2, characterized in that: The middle of the pipeline is provided with an adsorption tower (6).

4. A safe and environmentally friendly discharging and granulating device for the oxidation process of polyethylene wax oxidation as claimed in claim 2, characterized in that: The special internal structure design of the two-fluid nozzle (4) can make the water and oxidized polyethylene wax melt mix uniformly.

5. A safe and environmentally friendly discharging and granulating device for the oxidation process of polyethylene wax oxidation as claimed in claim 1, characterized in that: The middle of the water inlet pipe (5) is provided with a stop valve (8), and the outer side of the water inlet pipe (5) is provided with a fluid pump (9) which is connected to an external water supply device.

6. A safe and environmentally friendly discharging and granulating method for the oxidation process of polyethylene wax oxidation, applied to the device as claimed in any one of claims 1-5, characterized in that, The specific steps are as follows: Step one: first, the oxidized polyethylene wax melt obtained by oxidizing polyethylene wax is pumped into the nozzle of the two-fluid nozzle (4) through a pipeline, then hot water with a temperature similar to that of the oxidized polyethylene wax melt is pumped into the nozzle of the two-fluid nozzle (4) through a pump, and then the water and the oxidized polyethylene wax melt are mixed in the two-fluid nozzle (4), and the hot water mixed with the oxidized polyethylene wax fragments is directly mixed into the water tank (3); Step two: the oxidized polyethylene wax particles in the water tank (3) will float on the upper layer of the water due to their lower density than water, and will flow to the outlet with the water flow, and a dehydration roller (1) is arranged at the water outlet of the water tank (3); Step three: the dehydrated water is pumped out by the vacuum pump (2) for circulation, and then when the dehydrated and attached particle materials rotate into the positive pressure area of the roller, the positive pressure area of the roller is blown with dry hot air by the blower, so that the particle materials attached to the surface are further dried and fall off into the collection container.

7. A safe and environmentally friendly discharging and granulating method of an oxidation polyethylene wax oxidation process according to claim 6, characterized in that: After step one, water is injected into the water tank (3), and the water-soluble gas in the harmful gas contained in the oxidized polyethylene wax is purified by dissolving in the water flow, and since the two-fluid nozzle (4) is entirely wrapped by a material, a gap is left at the water outlet of the water tank (3), air flows into the gap, and the air is mixed with organic gas and enters the adsorption tower (6) through the top pipeline.

8. A safe and environmentally friendly discharging and granulating method of an oxidation polyethylene wax oxidation process according to claim 7, characterized by: After the third step, the exhaust gas in the collection plate is pumped out by fluid pump (7) and pressurized, and the middle part of the pipeline is provided with an adsorption tower (6). The tail gas is discharged after being purified by the adsorption tower (6).

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