CN210620672U - Refining device of crude polyethylene wax - Google Patents
Refining device of crude polyethylene wax Download PDFInfo
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- CN210620672U CN210620672U CN201921367847.8U CN201921367847U CN210620672U CN 210620672 U CN210620672 U CN 210620672U CN 201921367847 U CN201921367847 U CN 201921367847U CN 210620672 U CN210620672 U CN 210620672U
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Abstract
The utility model discloses a refining plant of thick low molecular weight polyethylene, the device is including pretreatment systems, take off light piece-rate system, dehydration clean system and granulation system, and pretreatment systems intercommunication takes off light piece-rate system, takes off light piece-rate system intercommunication dehydration clean system, dehydration clean system intercommunication granulation system. The utility model realizes the optimized utilization of raw materials, saves resources, reduces energy consumption, promotes sustainable development, improves the quality of polyethylene wax products, and enlarges the application range; the refining method has the characteristics of short flow, low energy consumption, less pollution and capability of realizing continuous production, and has higher implementation value, social benefit, environmental benefit and economic benefit.
Description
Technical Field
The utility model belongs to low molecular weight polyethylene's purification device, concretely relates to refining plant of thick low molecular weight polyethylene.
Background
The polyethylene wax is produced by three methods, namely a polyethylene cracking method, an ethylene synthesis method and a polyethylene device byproduct method. The polyethylene wax product can be directly obtained by two methods, namely an ethylene synthesis method and a polyethylene cracking method, but the byproduct wax produced by a high-density polyethylene device contains more light components and residual solvent, and can be used in plastic processing, but the byproduct wax generally needs to be refined and then sold because the light components volatilize in the processing process and generate a large amount of dense smoke which does not meet the requirement of environmental protection.
The existing refining methods of the byproduct wax include a pressure flash evaporation method, a reduced pressure distillation method, a solvent crystallization method and a steam distillation method. The method adopts a two-stage pressure flash evaporation method to remove light components in the polyethylene wax, has a good light component removal effect, but the color of the polyethylene wax is changed to yellow at high temperature, the obtained product is yellow wax, and the yellow wax can not be used in the processing of color master batches (except black master batches) and filling master batches, so that the application range of the yellow wax is limited. The vacuum distillation method is one of the common separation methods, and a rectification device has been built by the Gichi chemical Union force company, but the device has the problem of poor safety and is stopped being used. The solvent crystallization method is reported more recently, and the polyethylene wax obtained by the method can effectively reduce the melting range and improve the product quality.
The polyethylene wax is refined and purified to obtain a product with better quality, which is the requirement of industrial technology development. A patent of a method for separating polyethylene wax provides a method for separating polyethylene wax, alkane, aromatic hydrocarbon or a mixture of alkane and aromatic hydrocarbon of C5-C12 are used as a solvent, monohydric alcohol of C2-C4 is used as a precipitating agent, the temperature and the solvent ratio during dissolving are changed, and the steps of dissolving, concentrating, precipitating, separating, drying and the like are repeated, so that polyethylene wax products with different average molecular weight grades are correspondingly prepared. Because the adopted solvent is micromolecule solvent, the solvent is required to be evaporated in the concentration process, and the energy consumption is higher.
The patent 'a method for improving the melting point of polyethylene wax as a polyethylene byproduct' provides a method for improving the melting point of polyethylene wax as a polyethylene byproduct, a method for adding a nucleating agent and recrystallizing high-melting-point polyolefin is adopted, and after the recrystallization treatment is carried out on the polyethylene wax as a byproduct, the melting point of the obtained product is improved to 100.7-129.2 ℃, so that the method can be applied to the processing of color master batches and printing ink, and the high-grade polishing wax for automobiles and leather clothing, widens the application field of the polyethylene wax, improves the additional value of the product, and greatly improves the economic value. The method has complicated process and is difficult to realize industrialization.
In the patent "a method for separating polyethylene byproduct polyethylene wax", a method for selectively dissolving low-melting-point components in polyethylene wax by using a solvent is provided, so that the low-melting-point components and high-melting-point components in the polyethylene wax are separated to obtain high-melting-point and low-melting-point polyethylene wax products. The method adopts dimethylbenzene or n-heptane as a solvent, the crude polyethylene wax is dissolved, filtered and separated to obtain a polyethylene wax product, the filtered feed liquid is subjected to reduced pressure distillation, and the solvent is recycled. And the adopted solvent is small-molecule solvent, so that the solvent is required to be evaporated in the concentration process, and the energy consumption is high.
The patent "refined polyethylene wax, refined method and refining plant of polyethylene wax crude product" provides a method and apparatus for refining polyethylene wax, polyethylene wax crude product, its adopted method is to utilize steam stripping to polyethylene wax crude product, then carry on the dehydration treatment to the polyethylene wax product of initial extraction, get refined polyethylene wax; the operation mode is intermittent operation, and the batch time is about 20 hours and the efficiency is low on the premise that large petrochemical enterprises have molten polyethylene wax resources and do not need the operation of melting polyethylene wax solids.
Patent "a preparation facilities and preparation method of continuous refined polyethylene wax" proposes according to the weight proportion, in the stripper at the uniform velocity continuously transport solid polyethylene wax crude product and superheated steam, the crude product of solid polyethylene wax is stacked on the otter board; under the action of superheated steam, the solid polyethylene wax crude product is melted and stripped in the packing layer, and then is output and molded after being filtered by a liquid loading funnel. The method adopts the solid polyethylene wax crude product as a raw material, adopts superheated steam to melt and strip the solid polyethylene wax crude product under normal pressure, and simply and efficiently prepares the refined polyethylene wax. Steam distillation is a method which is widely used at present, but waste water is easily generated, and energy consumption is high.
SUMMERY OF THE UTILITY MODEL
The utility model is provided for overcoming the defects existing in the prior art, and the purpose of the utility model is to provide a refining device of coarse polyethylene wax.
The technical scheme of the utility model is that:
the utility model provides a refining plant of thick polyethylene wax, includes pretreatment systems, takes off light piece-rate system, dehydration refining system and granulation system, and pretreatment systems intercommunication takes off light piece-rate system, takes off light piece-rate system intercommunication dehydration refining system, and dehydration refining system intercommunication granulation system.
The pretreatment system comprises a raw material pretreatment tank, a raw material inlet and a desalted water inlet are formed in the side wall of the raw material pretreatment tank, and the bottom of the raw material pretreatment tank is communicated with a catalyst filtering system through a catalyst-containing wastewater pipeline.
The light component removal separation system comprises a light component removal dissolving kettle, a continuous centrifuge and a solvent recovery tower; the side wall of the light component removal dissolving kettle is communicated with the top of the raw material pretreatment tank through a I-level coarse polyethylene wax pipeline, the bottom of the light component removal dissolving kettle is communicated with the inlet of the continuous centrifuge through a II-level coarse polyethylene wax pipeline, the outlet of the top of the continuous centrifuge is communicated with the light component removal tower through a solvent and light component pipeline, the bottom of the solvent recovery tower is communicated with the light component removal dissolving kettle through a solvent pipeline, and the top of the solvent recovery tower is communicated with the light oil product tank through a light oil pipeline.
The dehydration refining system comprises a vacuum dehydration tank, and the water in the dehydration refining system is pumped out by the vacuum system through a water pipeline; the vacuum dehydration tank is communicated with a bottom outlet of the continuous centrifuge through a grade III coarse polyethylene wax pipeline, and the bottom outlet is communicated with the granulation system through a refined polyethylene wax pipeline.
The utility model has the advantages that:
the utility model provides a refining plant of thick low molecular weight polyethylene wax through high boiling point solvent dissolution and centrifugal filtration's method, divide into light oil product and high-quality low molecular weight polyethylene product with thick low molecular weight polyethylene, adopts rectification technology again, recycle solvent. The obtained byproduct light oil mainly comprises straight-chain alkane of C6-C20, can be used as a diesel oil additive for improving the cetane number of diesel oil or further purifying and separating the diesel oil to be used as a cosmetic additive; the polyethylene wax product after removing the light oil has high whiteness, no odor and wide application range. The utility model realizes the optimized utilization of raw materials, saves resources, reduces energy consumption, promotes sustainable development, improves the quality of polyethylene wax products, and enlarges the application range; the refining method has the characteristics of short flow, low energy consumption, less pollution and capability of realizing continuous production, and has higher implementation value, social benefit, environmental benefit and economic benefit.
Drawings
FIG. 1 is a schematic structural view of a device for refining medium crude polyethylene wax according to the present invention.
Wherein:
1 raw material inlet and 2 desalted water inlet
3 contain thick polyethylene wax pipeline of catalyst waste water pipeline 4I level
5 solvent pipeline 6 II grade crude polyethylene wax pipeline
7 solvent and light component pipeline 8 III grade crude polyethylene wax pipeline
9 vacuum system 10 refined polyethylene wax pipeline
11 light oil pipeline 12 raw materials preliminary treatment jar
13 light component removing dissolving kettle 14 continuous centrifuge
15 vacuum dehydration tank 16 solvent recovery tower
17 catalyst filtration system 18 vacuum system
19 granulation system 20 light oil product tank.
Detailed Description
The refining device of the crude polyethylene wax of the present invention is described in detail with reference to the drawings and examples in the specification:
as shown in figure 1, the refining device for the crude polyethylene wax comprises a pretreatment system, a lightness-removing separation system, a dehydration refining system and a granulation system 19, wherein the pretreatment system is communicated with the lightness-removing separation system, the lightness-removing separation system is communicated with the dehydration refining system, and the dehydration refining system is communicated with the granulation system 19.
The pretreatment system comprises a raw material pretreatment tank 12, a raw material inlet 1 and a desalted water inlet 2 are arranged on the side wall of the raw material pretreatment tank 12, and the bottom of the raw material pretreatment tank is communicated with a catalyst filtering system 17 through a catalyst-containing wastewater pipeline 3.
The lightness-removing separation system comprises a lightness-removing dissolving kettle 13, a continuous centrifuge 14 and a solvent recovery tower 16; the side wall of the light component removal and dissolution kettle 13 is communicated with the top of the raw material pretreatment tank 12 through a first-level crude polyethylene wax pipeline 4, the bottom of the light component removal and dissolution kettle is communicated with the inlet of a continuous centrifuge 14 through a second-level crude polyethylene wax pipeline 6, the outlet of the top of the continuous centrifuge 14 is communicated with a solvent recovery tower 16 through a solvent and light component pipeline 7, the bottom of the solvent recovery tower 16 is communicated with the light component removal and dissolution kettle 13 through a solvent pipeline 5, and the top of the solvent recovery tower is communicated with a light oil product tank 20 through a light oil pipeline.
The dehydration refining system comprises a vacuum dehydration tank 15, and the water in the dehydration refining system is pumped out by a vacuum system 18 through a water pipeline 9; the vacuum dehydration tank 15 is communicated with a bottom outlet of the continuous centrifuge 14 through a grade III coarse polyethylene wax pipeline 8, and the bottom outlet is communicated with a granulation system 19 through a refined polyethylene wax pipeline 10.
The utility model discloses the working process of device:
feeding a raw polyethylene wax raw material and water into a raw material pretreatment tank; in a raw material pretreatment tank, hydrolyzing to remove the catalyst in the crude raw material, allowing the catalyst-containing wastewater to enter a subsequent catalyst filtration system, and allowing the crude polyethylene wax raw material from which the catalyst is removed to enter a light component removal dissolving kettle; the solvent also enters a light component removal dissolving kettle; in a light component removal dissolving kettle, a solvent and a crude polyethylene wax raw material are stirred, fully mixed and dissolved, and then enter a centrifugal filter; separating the mixture into a light component containing the solvent and polyethylene wax with the light component removed in a continuous centrifuge; the light component containing the solvent enters a solvent recovery tower and is separated into light oil and the solvent through decompression; and (4) the light oil enters a light oil storage tank, and the solvent returns to the light oil removal dissolving kettle for recycling. And (3) feeding the crude polyethylene wax subjected to light component removal into a vacuum dehydration tank, feeding the removed moisture into a vacuum post-cooling system, and feeding the refined polyethylene wax subjected to moisture removal into a subsequent granulation system.
Claims (4)
1. The utility model provides a refining plant of crude polyethylene wax which characterized in that: the device comprises a pretreatment system, a light component removal separation system, a dehydration refining system and a granulation system (19), wherein the pretreatment system is communicated with the light component removal separation system, the light component removal separation system is communicated with the dehydration refining system, and the dehydration refining system is communicated with the granulation system (19).
2. The refining apparatus of crude polyethylene wax according to claim 1, wherein: the pretreatment system comprises a raw material pretreatment tank (12), a raw material inlet (1) and a desalted water inlet (2) are formed in the side wall of the raw material pretreatment tank (12), and the bottom of the raw material pretreatment tank is communicated with a catalyst filtering system (17) through a catalyst-containing wastewater pipeline (3).
3. The refining apparatus of crude polyethylene wax according to claim 1, wherein: the lightness-removing separation system comprises a lightness-removing dissolving kettle (13), a continuous centrifuge (14) and a solvent recovery tower (16); the side wall of the light component removal dissolving kettle (13) is communicated with the top of the raw material pretreatment tank (12) through a grade I crude polyethylene wax pipeline (4), the bottom of the light component removal dissolving kettle is communicated with the inlet of a continuous centrifuge (14) through a grade II crude polyethylene wax pipeline (6), the outlet of the top of the continuous centrifuge (14) is communicated with a solvent recovery tower (16) through a solvent and light component pipeline (7), the bottom of the solvent recovery tower (16) is communicated with the light component removal dissolving kettle (13) through a solvent pipeline (5), and the top of the solvent recovery tower is communicated with a light oil product tank (20) through a light oil pipeline (11).
4. The refining apparatus of crude polyethylene wax according to claim 1, wherein: the dehydration refining system comprises a vacuum dehydration tank (15), and the water in the dehydration refining system is pumped out by a vacuum system (18) through a water pipeline (9); the vacuum dehydration tank (15) is communicated with a bottom outlet of the continuous centrifuge (14) through a grade III coarse polyethylene wax pipeline (8), and the bottom outlet is communicated with a granulation system (19) through a refined polyethylene wax pipeline (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921367847.8U CN210620672U (en) | 2019-08-22 | 2019-08-22 | Refining device of crude polyethylene wax |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921367847.8U CN210620672U (en) | 2019-08-22 | 2019-08-22 | Refining device of crude polyethylene wax |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210620672U true CN210620672U (en) | 2020-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921367847.8U Active CN210620672U (en) | 2019-08-22 | 2019-08-22 | Refining device of crude polyethylene wax |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210620672U (en) |
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2019
- 2019-08-22 CN CN201921367847.8U patent/CN210620672U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Refining device of crude polyethylene wax Effective date of registration: 20220128 Granted publication date: 20200526 Pledgee: Bank of China Limited Tianjin Nankai sub branch Pledgor: TIANJIN HUIZHU HENGSHENG TECHNOLOGY Co.,Ltd. Registration number: Y2022110000026 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230512 Granted publication date: 20200526 Pledgee: Bank of China Limited Tianjin Nankai sub branch Pledgor: TIANJIN HUIZHU HENGSHENG TECHNOLOGY Co.,Ltd. Registration number: Y2022110000026 |