CN214299997U - Polyethylene wax purification system - Google Patents
Polyethylene wax purification system Download PDFInfo
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- CN214299997U CN214299997U CN202120277389.XU CN202120277389U CN214299997U CN 214299997 U CN214299997 U CN 214299997U CN 202120277389 U CN202120277389 U CN 202120277389U CN 214299997 U CN214299997 U CN 214299997U
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Abstract
The utility model discloses a low molecular weight polyethylene purification system adds thick low molecular weight polyethylene to in the wax flash tank to let in vapour and carry out the flash distillation, low molecular weight polyethylene after the flash distillation gets into wax purifying tank and wax holding vessel in proper order again. And the air outlets of the wax flash tank, the wax purification tank and the wax storage tank are respectively connected to the waste gas compressor and the liquid recovery tank through condensers. The hexane and other light components in the polyethylene wax can be fully removed, the catalyst and the cocatalyst in the polyethylene wax are completely inactivated, and the purified liquid finished polyethylene wax is conveyed to a tank wagon through a pump for transportation.
Description
Technical Field
The utility model relates to a liquid low molecular weight polyethylene purification system.
Background
Many domestic HDPE plants use low pressure slurry process technology to produce unimodal, bimodal and multimodal high density polyethylene products from ethylene and hydrogen as raw materials and butene-1 as comonomer in the hexane solvent environment. In the production of high density polyethylene, the low molecular weight components ("polyethylene wax") need to be separated from the product and sent to a wax distillation section for disposal. As a design scheme of the prior art, normal pressure or micro-positive pressure steam distillation is generally adopted, industrial water is introduced to cool the polyethylene wax, and the wax is discharged into a ton bag. In the process of dewaxing, the problems of unorganized discharge of waste water, dirty and messy device sites and the like easily occur, a large amount of manpower is needed to complete the work, and the problems of high water content and high hydrocarbon content in polyethylene wax and the like exist, so that the downstream user is difficult to use.
The Chinese patent application with the publication number of CN110407959A discloses a method and a device for refining crude polyethylene wax, wherein the device comprises a pretreatment system, a light component removal separation system, a dehydration refining system and a granulation system. Dissolving and separating the crude ethylene wax by adopting a solvent dissolving method, and then carrying out centrifugal filtration; dehydrating and refining the solid after centrifugal filtration to obtain a high-quality polyethylene wax product; the liquid after centrifugal filtration is a mixture of light oil and a solvent, the liquid after centrifugal filtration is rectified and separated, the light component obtained at the top of the tower is the light oil, and the heavy component at the bottom of the tower is the solvent for recycling. The method has the main defects of complex process, long flow, more equipment, large investment, wide occupied area, large amount of waste water, granulation unit and increased operation cost of the device.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a low molecular weight polyethylene purification system is provided, solve low molecular weight polyethylene normal water content and hydrocarbon content scheduling problem excessively, promote low molecular weight polyethylene's quality simultaneously.
The technical scheme of the utility model as follows:
a polyethylene wax purification system is characterized by comprising a wax flash tank with a steam inlet, a polyethylene wax feed inlet to be treated and a discharge outlet, a wax purification tank provided with a stirring paddle and provided with a feed inlet, a discharge outlet and a steam inlet, and a wax storage tank provided with a stirring paddle and provided with a feed inlet and a discharge outlet; the discharge port of the wax flash tank is connected with the feed port of the wax purifying tank through a pipeline, and the discharge port of the wax purifying tank is connected with the feed port of the wax storage tank through a pipeline with a wax delivery pump.
Preferably, the discharge port of the wax storage tank is connected with a wax transport vehicle through a pipeline with a wax discharge pump.
Preferably, the wax flash tank, the wax purification tank and the wax storage tank are respectively provided with an exhaust port; the exhaust port of the wax flash tank is connected with a first condenser through a pipeline, and the exhaust ports of the wax purification tank and the wax storage tank are respectively connected with a second condenser through pipelines.
The utility model has the advantages of:
the system of the utility model has the outstanding characteristics of simple process, short flow, less equipment, small investment, zero emission and the like. The clean production of the wax recovery system is realized, and the discharge of the waste water and organic matters on the site of the device is avoided. The utility model discloses still realized the abundant desorption of hexane solvent, made main catalyst and cocatalyst inactivation completely, solved low water content in low molecular weight polyethylene and hydrocarbon content scheduling problem too high, promoted the quality of wax, increased the benefit of wax.
Drawings
Fig. 1 is a schematic diagram of the structure and the operation principle of the embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and accompanying drawings.
As shown in FIG. 1, the embodiment of the utility model comprises a wax flash tank 2 with a steam inlet, a pending polyethylene wax feed inlet and a discharge outlet, a wax purification tank 4 with a stirring paddle and a feed inlet, a discharge outlet and a steam inlet, and a wax storage tank 7 with a stirring paddle and a feed inlet and a discharge outlet. The discharge port of the wax flash tank 2 is connected with the feed port of the wax purifying tank 4 through a pipeline, and the discharge port of the wax purifying tank 4 is connected with the feed port of the wax storage tank 7 through a pipeline with a wax delivery pump 6. The discharge port of the wax storage tank 7 is connected with a wax transport vehicle 16 through a pipeline with a wax discharge pump 15.
The wax flash tank 2, the wax purification tank 4 and the wax storage tank 7 are respectively provided with an exhaust port, and the exhaust port of the wax flash tank 2 is connected with a first condenser 9 through a first pipeline 8. The exhaust port of the wax purification tank 4 is connected to a second condenser 13 through a second pipe 12. The exhaust of the wax storage tank 7 is connected to the second pipeline 12 by a pipeline, and the exhaust of the wax storage tank 7 can also be directly connected to the second condenser 13 by a pipeline.
The polyethylene wax to be treated is generally a by-product obtained during the polymerization, and is generally a non-crystalline polyethylene wax, which is dissolved in the dispersant hexane.
The polyethylene wax to be treated is pumped into a wax flash tank 2 through a double-tube heat exchanger and a feed pipe 1. Steam is fed to the wax flash tank 2 through a steam injector via wax flash tank steam inlet 3 in order to increase the removal rate of hexane from the wax and to destroy residual catalyst and triethyl aluminum.
The material is discharged from the wax flash tank 2 to a wax purification tank 4 provided with a stirring paddle by means of gravity and liquid level control. Steam is fed to the wax cleaning tank 4 through a steam injector via a wax cleaning tank steam inlet pipe 5 and the purpose of the steam treatment is to ensure that the macromolecular hydrocarbon species are sufficiently removed from the wax and that the residual catalyst and triethylaluminium are completely deactivated.
Under the action of a wax delivery pump 6, purified polyethylene wax enters a wax storage tank 7 from a discharge port of a wax purification tank 4 through a pipeline, and then is delivered to a wax transport vehicle 16 through a pipeline under the action of a wax discharge pump 15.
Hexane vapor from the exhaust of the wax flash tank 2 is condensed and separated in a first condenser 9, the vapor phase exits the system and enters a waste gas compressor unit 11, and the liquid phase passes through a first exhaust line 10 to a subcooler.
The heavy hydrocarbon fraction from the outlet of the wax purification tank 4 and the gas mixture from the outlet of the first liquid discharge pipe are condensed and separated in a second condenser 13, the gas phase is discharged from the system and enters the waste gas compressor unit 11, and the liquid phase is delivered to a separation tank outside the system through a second liquid discharge pipe 14.
Claims (3)
1. A polyethylene wax purification system is characterized by comprising a wax flash tank (2) with a steam inlet, a polyethylene wax feeding hole to be treated and a discharging hole, a wax purification tank (4) provided with a stirring paddle and a feeding hole, a discharging hole and a steam inlet, and a wax storage tank (7) provided with a stirring paddle and a feeding hole and a discharging hole; the discharge port of the wax flash tank (2) is connected with the feed port of the wax purifying tank (4) through a pipeline, and the discharge port of the wax purifying tank (4) is connected with the feed port of the wax storage tank (7) through a pipeline with a wax delivery pump (6).
2. The polyethylene wax purification system of claim 1, wherein: the discharge port of the wax storage tank (7) is connected with a wax transport vehicle (16) through a pipeline with a wax discharge pump (15).
3. The polyethylene wax purification system according to claim 1 or 2, wherein: the wax flash tank (2), the wax purification tank (4) and the wax storage tank (7) are respectively provided with an exhaust port; the exhaust port of the wax flash tank (2) is connected with a first condenser (9) through a pipeline, and the exhaust ports of the wax purification tank (4) and the wax storage tank (7) are respectively connected with a second condenser (13) through pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120277389.XU CN214299997U (en) | 2021-02-01 | 2021-02-01 | Polyethylene wax purification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120277389.XU CN214299997U (en) | 2021-02-01 | 2021-02-01 | Polyethylene wax purification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214299997U true CN214299997U (en) | 2021-09-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120277389.XU Active CN214299997U (en) | 2021-02-01 | 2021-02-01 | Polyethylene wax purification system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214299997U (en) |
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2021
- 2021-02-01 CN CN202120277389.XU patent/CN214299997U/en active Active
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